TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 1 GIO DC HNG PHC S : 01 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1:2 dao ng iu ha cng phngx1 = 3 cos (5 tt +t /2) (cm) v x2 =3 cos ( 5 tt + 5t/6) (cm) . Phng trnh ca dao ng tng hp ca hai dao ng ni trn lA: x = 3 cos ( 5 tt +t/3) (cm).B: x = 3 cos ( 5 t t + 2t/3) (cm). C:x= 23 cos ( 5 t t + 2t /3) (cm).D: x = 4 cos ( 5 t t +t /3) (cm). Cu 2:Hai con lc ndao ng iu ha ti cng mt ni trn mt t, c nng lng nh nhau. Qu nng ca chng c cng khi lng, chiu di dy treo con lc th nht di gp i chiu di dy treo con lc th hai . Quan h v bin gc ca hai con lc lA:o1 = 2 o2; B:o1 = 12o2;C:o1 = 12 o2 ;D:o1 =2o2 . Cu 3:Trn ng ph c mc cng m l L1 = 70 dB, trong phng o c mc cng m l L2 = 40dB. T s I1/I2 bng A: 300.B: 10000.C: 3000.D: 1000. Cu 4:Mt my bin p l tng c t s vng dy cun s cp v th cp l 2:3. Cun th cp ni vi ti tiu th l mch in RLC khng phn nhnh c R=60, 30, 6 3 10L H; C F12 3= =t t, cun s cp ni vi in pxoay chiu c tr hiu dng 120V tn s 50Hz. Cng sut to nhit trn ti tiu th l:A: 180 WB: 90 WC: 26,7 WD: 135 W Cu 5:Trong th nghim vi t bo quang in.Nu thit lp hiu in th cho dng quang in trit tiu hon ton th:A: Ch nhng electron quang in bt ra khi b mt catt theo phng php tuyn th mi khng b ht tr v catt.B: Electron quang in sau khi bt ra khi catt ngay lp tc b ht tr v. C: Chm phtn chiu vo catt khng b hp thD: Cc electron khng th bt ra khi b mt catt. Cu 6:Cng thc tnh nng lng lin kt? A: W lk = m.c2 B: W lk =Am.c2 C: W= Am.c2 /AD: W lk = Am.c2 /Z Cu 7:Trong th nghim Ing v giao thoa nh sng, hai khe cch nhau 0,5 mm v c chiu sng bng mt nh sng n sc. Khong cch t hai khe n mn quan st l 2 m. Trn mn quan st, trong vng gia M v N (MN = 2 cm) ngi ta m c c 10 vn ti v thy ti M v N u l vn sng. Bc sng ca nh sng n sc dng trong th nghim ny l A: 0,7 m B: 0,6 m C: 0,5 m D: 0,4 m Cu 8:Sng m c tn s 450Hz lan truyn vi tc 360m/s trong khng kh. Gia hai im cch nhau 1m trn phng truyn th chng dao ng: A: Lch pha 4t.B: Ngc phaC: Vung phaD: Cng pha Cu 9:Dng nh sng c bc sng 4.10 7 m n 7,5.10 7m trong th nghim Y-ng v giao thoa nh sng. Bit khong cch gia hai khe l 0,6mm, khong cch gia hai khe v mn l 1,2m. Trong cc bc x sau y, bc x no cho vn sng ti v tr trn mn cch vn sng trung tm 3,6mm ? A: 0,5 m B: 0,45 mC: 0,55 mD: 0,66 m Cu 10: Mt cht phng x c chu k bn r T =10s. Lc u c phng x 2.107Bq cho phng x gim xung cn 0,25.107Bq th phi mt mt khong thi gian bao lu: A: 30s.B: 20s.C: 15s.D: 25s. Cu 11: Kim loi dng lm catt ca mt t bo quang in c cng thot A = 2,2eV. Chiu vo catt mt bc x c bc sng . Mun trit tiu dng quang in, ngi ta phi t vo ant v catt mt hiu in th hm c ln hU = 0,4V. Bc sngca bc x c th nhn gi tr no sau y? A:0,678 m.B:0,577 m.C:0,448m.D:0,478 m. Cu 12: Cho on in xoay chiu gm cun dy c in tr thun r, t cm L mc ni tip vi t in c in dung C. Bit hiu in th gia hai u on mch cng pha vi cng dng in, pht biu no sau y l sai: A: Hiu in th trn hai u on mch vung pha vi hiu in th trn hai u cun dy. B: Cm khng v dung khng ca on mch bng nhau. C: Trong mch in xy ra hin tng cng hng in. D: Hiu in th hiu dng trn hai u cun dy ln hn hiu in th hiu dng trn hai u on mch. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 2 Cu 13: tinpxoaychiuu 120 2cos(100 t )V3t= t + vohaiuonmchRLCnitipc 42 10R 100 3 ;L H;C F= O = =t t. Biu thc dng in qua mch l:A:i 0, 6 2cos(100 t )A6t= t + B:i 1, 2 2cos(100 t )A3t= t C:i 1, 2 2cos(100 t)A = t D:i 0, 6 2cos(100 t )A3t= t +Cu 14: Mt mch dao ng LC l tng c L=40mH, C=25F, ly t2=10, in tch cc i ca t q0=6.10-10C. Khi in tch ca t bng 3.10-10C th dng in trong mch c ln A: 33 .10-7 A B: 6.10-7AC: 73.10 AD: 2.10-7A Cu 15: Mt con lc n chu tc dng ca lc cng bc bin thin theo quy lut hm s sin vi tn s f. thno m t hp l s bin thin ca bin dao ng con lc theo tn s f ? Cu 16: Mt vt nh khi lng m = 400g c treo vo mt l xo nh, c cng 40N/m. a vt ln n v tr l xo khng b bin dng ri th nh vt dao ng iu ha. Chn gc ta ti VTCB, chiu dng hng xung, gc thi gian lc vt bt u dao ng , g= 10m/s2 . Phng trnh dao ng ca vt l A: x = 5 sin(10t) (cm)B: x = 10 cos (10t) (cm)C: x = 10 cos (10t + ) (cm)D: x = 5 cos (10t - ) (cm) Cu 17: Mt con lc l xo cch v tr cn bng 4 cm th c tc bng khng v l xo khng bin dng. Cho g = 9,8 m/s2. Tc ti v tr cn bng l A: 0,626 m/s.B: 6,26 cm/s.C: 6,26 m/s.D: 0,633 m/s. Cu 18: Vt dao ng iu ha trn trc Oxquanh v tr cn bng l gc ta . Gia tc ca vt c phng trnh: a = - 400 t2x. s dao ng ton phn vt thc hin c trong mi giy l A: 20.B: 10 C: 40.D: 5. Cu 19: Mt vt dao ng iu ha vi bin bng 0,05m, tn s 2,5 Hz . Gia tc cc i ca vt bng A: 12,3 m/s2 B: 6,1 m/s2 C: 3,1 m/s2 D: 1,2 m/s2 Cu 20: Hai ngun dao ng kt hp S1, S2 gy ra hin tng giao thoa sng trn mt thong cht lng. Nu tng tn s dao ng ca hai ngun S1 v S2 ln 2 ln th khong cch gia hai im lin tip trn S1S2 c bin dao ng cc tiu s thay i nh th no? A: Tng ln 2 ln.B: Khng thay i.C: Gim i 2 ln.D: Tng ln 4 ln. Cu 21: c sng dng xy ra trn mt si dy n hi vi hai u dy c nh v mt u t do th chiu di ca dy phi bng A:mt s nguyn ln bc sng.B:mt s nguyn ln phn t bc sng.C:mt s nguyn ln na bc sng. D:mt s l ln mt phn t bc sng.Cu 22: Mt mch dao ng LC l tng c L=2mH, C=8F, ly t2=10. Nng lng t trng trong mch bin thin vi tn s A: 1250Hz.B: 5000Hz.C: 2516Hz.D: 625Hz. Cu 23: in p cc i gia hai bn t trong khung dao ng bng 6(V), in dung ca t bng 1(F). Bit dao ng in t trong khung nng lng c bo ton, nng lng t trng cc i tp trung cun cm bng: A: 9.106(J)B: 18.106(J)C: 1,8.106(J)D: 0,9.106(J) Cu 24: Dao ng in t trong mch dao ng LC l qu trnhA: bin i khng tun hon ca in tch trn t in B: bin i theo hm m ca cng dng in C: Chuyn ha tun hon gia nng lng in trng v nng lng t trng D: Chuyn ha gia in trng v t trng Cu 25: in tch cc i ca t trong mch LC c tn s ring f=105Hz l q0=6.10-9C: Khi in tch ca t l q=3.10-9C th dng in trong mch c ln: A: 46 3 10 At B: 46 10 At C:46 2 10 AtD:52 3 10 AtCu 26: Vi UR, UL, UC, uR, uL, uC l cc in p hiu dng v tc thi ca in tr thun R, cun thun cm L v t in C, I v i l cng dng in hiu dng v tc thi qua cc phn t . Biu thc sau y khng ng l: A: RUIR= B: RuiR= C: LLUIZ= D: LLuiZ=Cu 27: Dng in xoay chiu l dng in c A: cng bin thin iu ho theo thi gian.B: chiu bin thin iu ho theo thi gian. C: cng bin thin tun hon theo thi gian.D: chiu bin thin tun hon theo thi gian. A OAf Hnh A A O D f Hnh D A OBf Hnh B A OCf Hnh C TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 3 Cu 28: Mt my pht in xoay chiu mt pha c phn cm gm 8 cp cc, rto quay vi tc 7 vng/s. Tn s dng in do my pht ra l: A: 50HzB: 60HzC: 56HzD: 87Hz Cu 29: Chn cu sai khi ni v ng c khng ng b ba pha A: T trng tng hp quay vi tc gc lun nh hn tn s gc ca dng in. B: Nguyn tc hot ng da trn hin tng cm ng in t v s dng t trng quay. C: Stato c ba cun dy ging nhau qun trn ba li st b tr lch nhau 1/3 vng trn. D: T trng quay c to ra bi dng in xoay chiu ba pha Cu 30: Ta cn truyn mt cng sut in 1MW di mt hiu in th hiu dng 10 kV i xa bng ng dy mt pha Mch c h s cng sut k = 0,8. Mun cho t l hao ph trn ng dy khng qu 10% th in tr ca ng dy phi c gi tr l: A: R s 6,4O.B: R s 4,6O.C: R s 3,2O.D: R s 6,5O. Cu 31: Trong quang ph ca nguyn t hir, c mt vch quang ph c bc sng nm trong khong t 0,37 m n 0,39 m. Hi vch thuc dy no? A: Lai-man.B:Pa-sen.C: Ban-me hoc Lai-man.D: Ban-me. Cu 32: Trongquangph canguyn tHyr, vch c tn snhnht cadyLaimanl f1 =8,22.1014 Hz, vch c

tn s ln nht ca dy Banme lf2 = 2,46.1015 Hz. Nng lng cn thit ion ho nguyn t Hyr t trng thi c bn l: A:E~ 21,74.10- 19J.B:E~ 16.10- 19 J.C: E~ 13,6.10- 19 J.D:E~ 10,85.10- 19 J Cu 33: Cng thc Anhxtanh v hin tng quangA: c= hf.B: hfmn=Em-En. C: hf= A+ 12 mv2omax D: E=mc2. Cu 34: Tm pht biu ng? A:Khi lng ca mt ht nhn lun nh hn tng khi lng ca cc ht to thnh ht nhn . B:Khi lng ca mt ht nhn lun bng tng khi lng ca cc ht to nn n v khi lng bo ton C:Khi lng ca ht nhn ln hn khi lng ca tng cc ht to thnh n v khi kt hp electron ng vai tr cht kt dnh ln hp vi proton to nn ntron D:Khng c pht biu ng Cu 35: Kt qu no sau y ph hp vi hin tng phng x? A: Khi t = T th 0mm4= B: 0t / TNN2= C: 1n2T =D:T1n2 =Cu 36: Ht o c ng nng 5,3 (MeV) bn vo mt ht nhn 94Beng yn, gy ra phn ng: 94Be+ o n + X. Ht n chuyn ng theo phng vung gc vi phng chuyn ng ca ht o. Cho bit phn ng ta ra mt nng lng 5,7 (MeV). Tnh ng nng ca ht nhn X. Coi khi lng xp x bng s khi. A: 18,3 MeV B: 0,5 MeVC: 8,3 MeV D: 2,5 MeV Cu 37: C cc loi ht s cp sau: A: Photon, lepton, mezon, barionB: Proton, electron, photon, notrino C: Proton, electron,notron, ntrinoD: Proton, notron, photon, notrino Cu 38: Ht nhn nguyn t no cho sau y l cc ht s cp. A: Ht nhn heli`B: Ht nhn cacbonC: Ht nhn hidroD: Ht nhn oxi Cu 39: Chn cu saikhi ni v tia hng ngoiA: C th ngi c th pht ra tia hng ngoi B: Tia hng ngoi c tn s nh hn tn s ca nh sng C: Tia hng ngoi c mu hngD: Tia hng ngoi c dng sy kh mt s nng sn Cu 40: Chiu mt chm tia sng trng hp qua lng knh, chm tia l gm nhiu chm sng c mu sc khc nhau. Hin tng c gi lA: khc x nh sngB: giao thoa nh sng C: tn sc nh sng D: phn x nh sng Cu 41: Vn tc nh sng l nh nht trongA: chn khng B: nc C: thy tinhD: khng kh Cu 42: Con lc l xo gm hn bi c m= 400 gv l xo c k= 80 N/m dao ng iu ha trn mt on thng di 10 cm. Tc ca hn bi khi qua v tr cn bng l A:1,41 m/s.B: 2,00 m/s.C: 0,25 m/s.D: 0,71 m/s Cu 43: duy tr dao ng cho mt c hm khng lm thay i chu k ring ca n, ta phi A: tc dng vo vt dao ng mt ngoi lc khng thay i theo thi gian. B: tc dng vo vt dao ng mt ngoi lc bin thin tun hon theo thi gian. C: lm nhn, bi trn gim ma st. D: tc dng ngoi lc vo vt dao ng cng chiu vi chuyn ng trong mt phn ca tng chu k. Cu 44: t mt in p xoay chiu vo hai u on mch RLC ni tip c R thay i th thy khi R=30 v R=120 th cng sut to nhit trn on mch khng i. cng sut t cc i th gi tr R phi l A: 24B: 90C: 150D: 60. Cu 45: Chn cu sai trong cc cu sau:Mch in xoay chiu RLC ni tip ang xy ra cng hng. Nu thay i tn s ca in p t vo hai u mch th: A: Cng hiu dng qua mch gim.B: H s cng sut ca mch gim. C: in p hiu dng trn R tng.D: Cng sut trung bnh trn mch gim. Cu 46: Chiu mt chm sng n sc c bc sng = 570nm v c cng sut P = 0,625W c chiu vo catt ca mt t bo quang in. Bit hiu sut lng t H = 90%. Cho h = 6.625.10-34J.s, e = 1,6.10-19C, c = 3.108m/s. Cng dng quang in bo ho l: A:0,179AB:0,125AC:0,258AD:0,416A TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 4 Cu 47: Ngi ta dng prton bn ph ht nhn Bri ng yn. Hai ht sinh ra l Hli v X. Bit prton c ng nng K= 5,45MeV, Ht Hli c vn tc vung gc vi vn tc ca ht prton v c ng nng KHe = 4MeV. Cho rng ln ca khi lng ca mt ht nhn (o bng n v u) xp x bng s khi A ca n. ng nng ca ht X bngA:6,225MeV .B:1,225MeV .C: 4,125MeV.D: 3,575MeV . Cu 48: Trong th nghim Y-ng v giao thoa nh sng, nu thay nh sng mu lam bng nh sng mu vng th A: khong vn s tng B: khong vn s gimC: khong vn vn nh cD: sng cc vn s gimCu 49: Trong hin tng truyn sng c vi tc truyn sng l 80cm/s, tn s dao ng c gi tr t 10Hz n 12,5Hz. Hai im trn phng truyn sng cch nhau 25cm lun dao ng vung pha Bcsng l A: 8 cmB: 6 cmC: 7,69 cmD: 7,25 cm Cu 50: Cho on mch xoay chiu gm cun dy thun cm L, t in C v bin tr R mc ni tip. Khi t vo hai u mch mt hiu in th xoay chiu n nh c tn s f th thy LC = 1/ 4f2t2. Khi thay i R th: A: H s cng sut trn mch thay i.B: Cng sut tiu th trn mch khng i. C: Hiu in th gia hai u bin tr khng i.D: lch pha gia u v i thay i. GIO DC HNG PHC S : 02 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1: Pht biu no sai khi ni v cu to ca tri t A:Tri t c cu to dng hnh cu hi dt hai cc B:Bn knh ca tri t xch o ln hn bn knh ca tri t hai cc C:Bn knh ca tri t bng nhau mi v tr D:Tri t c mt ci li c cu to ch yu st v niken Cu 2:Ht nhn 11AZX phng x v bin thnh mt ht nhn 22AZY bn. Coi khi lng ca ht nhn X, Y bng s khi ca chng tnh theo n v u. Bit cht phng x 11AZX c chu k bn r l T. Ban u c mt khi lng cht 11AZX, sau 2 chu k bn r th t s gia khi lng ca cht Y v khi lng ca cht X lA: 12A4AB: 21A4AC: 21A3AD: 12A3A Cu 3:Chn cu sai. Phn ng ht nhn tun theo nh lut bo ton: A.Nng lng.B:ng lng.C:Khilng.D: in tch. Cu 4:Cu sai ? c im ca tia RnghenA: C kh nng m xuyn mnh.B: Tc dng mnh ln knh nh. C: C th i qua lp ch dy vi xentimet D: C kh nng lm ion ha khng kh v lm pht quang 1 s cht. Cu 5:Trong th nghim Ing ,cc khe c chiu sng bng nh sng trng c bc sng t 0,38 m n 0,76 m. Khong cch gia hai khe l 0,5 mm, khong cch gia hai khe n mn l 2 m. rng quang ph bc 2 quan st c trn mn l: A: 1,52mmB: 3,04mm C: 4,56mD: 6,08mm Cu 6:Mch gm mt in tr, mt cun dy v mt t in ghp ni tip. in p hiu dng ln lt: hai u mch l 65V, hai u in tr l 13V, hai u cun dy l 13V, hai u t in l 65V. H s cng sut ca mch bng: A: 8/13B: 1/5C: 5/13D: 4/5 Cu 7:Chn cu tr li ng : A: Dng in 3 pha l h thng ba dng in xoay chiu 1 pha c cng bin , tn s nhng lch pha nhau gc 1200. B: Dng in xoay chiu 3 pha l h thng 3 dng in xoay chiu 1 pha C: Khi chuyn i t cch mc sao sang cch mc tam gic th hiu in th dy tng ln3ln D: Dng in xoay chiu 3 pha do ba my pht in 1 pha to ra Cu 8:Mch dao ng in t LC gm mt cun dy c t cm 4 H v t in c in dung 2000 pF. in tch cc i trn t l 5 C: Nu mch c in tr thun 0,1 O, duy tr dao ng trong mch th phi cung cp cho mch mt cng sut bng A: 36 mWB: 15,625 W C: 36 W D: 156,25 W Cu 9:Ti hai im A, B trn mt cht lng cch nhau 15cm c hai ngun pht sng kt hp dao ng theo phng trnh u1 = acos(40tt) cm v u2 = bcos(40tt + t) cm. Tc truyn sng trn b mt cht lng l 40cm/s. Gi E, F l 2 im trn on AB sao cho AE = EF = FB. Tm s cc i trn EF. A: 5.B: 6.C: 4.D: 7. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 5 Cu 10: Con lc l xo dao ng iu ha theo phng thng ng, ly gc ta ti VTCB, chiu dng ca trc ta hng xung di . th no sau y biu din ng s thay i ca lc n hi T ca l xo theo li x ca vt ? Cu 11: Con lc n si dy c chiu di l dao ng iu ho ti ni c gia tc trng trng g, bit g = t2. Khong thi gian 2 ln lin tip ng nng bng khng lA: 0,25 s B: 2 sC: 1 sD: 0,5 s Cu 12: Trong dao ng iu ha ca mt vt th tp hp ba i lng sau y l khng thay i theo thi gian A: vn tc, lc, nng lng ton phnB: bin , tn s, gia tcC: bin , tn s, nng lng ton phnD: gia tc, chu k, lc Cu 13: Ht nhn A ang ng yn th phn r thnh ht nhn B c khi lng mB v ht o c khi lng mo . T s gia ng nng ca ht nhn B v ng nng ca ht o ngay sau phn r bng A: BmmoB: 2Bmmo| | |\ .C: BmmoD: 2Bmmo| | |\ . Cu 14: Ln lt chiu vo catt ca mt t bo quang in cc bc x in t c bc sng1=0/3.v2=0/9;0 l gii hn quang in ca kim loi lm catt. T s hiu in th hm tng ng vi cc bc1 v2 l: A: U1/U2 =2.B: U1/U2= 1/4.C: U1/U2=4.D: U1/U2=1/2.Cu 15: Trong nguyn t hir, khi electrn chuyn t qu o O v qu o M th nguyn t pht ra bc x thuc vngA: nh sng nhn thyB: Hng ngoi C: T ngoi D: Sng v tuyn Cu 16: gia hai khe v mn l 1,6m, khong cch gia 10 vn sng lin tip l 10,8mm. nh sng th nghim c bc sngA: 700nm B: 750nmC: 600 nm D: 650 nm Cu 17: Mt on mch gm mt cun dy khng thun cm c t cm L, in tr thun r mc ni tip vi mt in tr R = 40O. Hiu in th gia hai u on mch c biu thc u = 200cos100tt (V). Dng in trong mch c cng hiu dng l 2A v lch pha 45O so vi hiu in th gia hai u on mch. Gi tr ca r v L l: A: 10O v 0,159H.B: 25O v 0,159H.C: 10O v 0,25H.D: 25O v 0,25H. Cu 18: Trong mt on mch in xoay chiu ch cha cc phn t R, L, C, pht biu no sau y ng ? Cng sut in (trung bnh) tiu th trn c on mch A: lun bng tng cng sut tiu th trn cc in tr thun B: khng thay i nu ta mc thm vo on mch mt t in hay cun dy thun cm C: khng ph thuc g vo L v C D: ch ph thuc vo gi tr in tr thun R ca on mch Cu 19: Trong h thng truyn ti in nng i xa theo cch mc hnh sao th A: dng in trong mi dy pha u lch pha 23t so vi hiu in th gia dy v dy trung ha B: cng dng in trong dy trung ha lun bng khng C: hiu in th hiu dng gia hai dy pha ln hn gia mt dy pha v dy trung ha D: cng hiu dng trong dy trung ha bng tng cng hiu dng trong cc dy pha Cu 20: Mch dao ng gm mt cun dy thun cm c t cm 4 mH v mt t in c in dung9 F, ly 2 = 10. Thi gian ngn nht k t lc cng dng in qua cun dy cc i n lc cng dng in qua cun dy c gi tr bng na gi tr cc i lA: 6.10-4 s.B: 2.10-4 s.C: 4.10-4 s.D: 3.10-3 s. Cu 21: Mt ng h qu lc c iu khin bi con lc n chy ng gi khi t a cc Bc c gia tc trng trng 9,832 m/s2. a ng hvxch o c gia tc trng trng 9,78 m/s2. Hi trong mt ngym th sovi ng h chun n chy nhanh hay chmbao nhiu? Bit nhit khng thay i. A: chm 2,8 phtB: Nhanh 2,8 phtC: Chm 3,8 pht D: Nhanh 3,8 pht Cu 22: Vt dao ng iu ha dc theo trc Ox, quanh VTCB O vi bin A v chu k T. Trong khong thi gian T/3, qung ng nh nht m vt c th i c l A: ( 3- 1)A;B: 1A; C: A 3 , D: A:(2 -2 ) Cu 23: Con lc l xo, khi lng ca vt l 1kg DH vi c nng 0,125 J. Ti thi im vt c vn tc 0,25 m/s th c gia tc -6,25 3m/s2. cng ca l xo l A: 100 N/mB: 200 N/mC: 625 N/m D: 400 N/m Cu 24: Sau khi xy ra hin tng cng hng nu A: tng ln lc ma st th bin tngB: tng ln lc ma st th bin gim C: gim ln lc ma st th chu k tng D: gim ln lc ma st th tn s tng Cu 25: Mt con lc l xo dao ng iu ha vi chu k T th khong thi gian hai ln lin tip ng nng ca vt bng th nng l xo l A: TB: T/2C: T/4 D: T/8 Cu 26: Cng thc tnh nng lng lin kt ring? A: W lkr = m.c2 B: W lkr=Am.c2 C: W lkr = Am.c2 /AD: W lkr = Am.c2 /Z Cu 27: Ht nhn He 3 c A: 3n v 2pB: 2n v 3pC: 3 nuclon , trong c 2 n D: 3 nuclon , trong c 2p Cu 28: Hin tng quang in ngoi l hin tng electron bt ra khi T x OA T x O B T x OC T Dx TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 6 A:B mt kim loi khi b ion p vo kim loi.B: B mt kim loi khi kim loi b nung nng.C: Nguyn t khi nguyn t va chm vi nguyn t khc D: B mt kim loi khi chiu nh sng thch hp vo b mt kim loi Cu 29: Trong th nghim giao thoa nh sng bng hai khe Ing trong khng kh ngi ta thy ti M trn mn c vn sng bc 3. Nu nhng ton b h thng vo trong nc c chit sut n = 4/3 th ti M ta thu c vn g?A: Vn ti th 4 tnh t vn trung tmB: Vn sng bc 4 C: Vn ti th 6 tnh t vn trung tmD: Vn sng bc 6 Cu 30: Mt hiu in th xoay chiu 120V, 50Hz c t vo hai u on mch gm in tr R mc ni tip vi t in (C). Hiu in th hiu dng gia hai bn t (C) bng 96V. Hiu in th hiu dng gia hai u in tr R bng: A: 72VB: 48VC: khng xc nh cD: 24V Cu 31: Khi mc t in c in dung C1 vi cun cm L th mch thu sng thu c sng c bc sng 1 = 60m; khi mc t in c in dung C2vi cun cm L th mch thu c sng c bc sng 2 = 80m. Khi mc C1ni tip C2v ni tip vi cun cm Lth mch thu c bc sng l: A: =100m.B: = 140m.C: = 70m.D: = 48m. Cu 32: Ti im S trnmt nc yn tnh c ngun dao ng iu ho theo phng thng ng vi tn s f. Khi trn mt nc hnh thnh h sng trn ng tm S. Ti hai im M, N nm cch nhau 5cm trn ng thng i qua S lun dao ng ngc pha vi nhau. Bit tc truyn sng trn mt nc l 80cm/s v tn s ca ngun dao ng thay i trong khong t 48Hz n 64Hz. Tn s dao ng ca ngun l A: 64Hz.B: 48Hz.C: 54Hz.D: 56Hz. Cu 33: Chn cu sai A: Trong s t dao ng, h t iu khin s b p nng lng t t cho con lcB: Trong s t dao ng, dao ng duy tr theo tn s ring ca h.C: Trong dao ng cng bc, bin ph thuc vo hiu s tn s cng bc v tn s ring. D: Bin dao ng cng bc khng ph thuc cng ca ngoi lc Cu 34: Trong thi gian 4 chu k song truyen c quang ng la12m. Tren phng truyen song, khoang gia 2 i em gan nhau nhat dao ong vuong pha l a:A: 0,75mB: 1,5m C: 3mD: 2,25m Cu 35: Mt si dy n di 1,2m c gi c nh hai u. Khi kch thch cho dy n dao ng gy ra mt sng dng lan truyn trn dy c bc sng di nht l A: 0,3mB: 0,6mC: 1,2m D: 2,4m Cu 36: Chn pht biu sai khi ni v mi trng truyn m v vn tc m: A: Mi trng truyn m c th l rn, lng hoc kh B: Nhng vt liu nh bng, nhung, xp truyn m ttC: Vn tc truyn m ph thuc vo tnh n hi v mt ca mi trng D: Vn tc truyn m ph thuc vo nhit ca mi trng Cu 37: Ngun in mt chiu c sut in ng 3 V, np in t in c in dung C = 10 F, sau ni vi cun dy thun cm c t cm L = 1 mH to thnh mch dao ng. Cng hiu dng dng in trong mch bng A: 1414 mAB: 300 mA C: 2000 mAD: 212 mA Cu 38: Dao ng in t trong mch LC ca my pht dao ng iu ha l:A: Dao ng cng bc vi tn s ph thuc c im ca tranzitoB: Dao ng duy tr vi tn s ph thuc c im ca tranzitoC: Dao ng t do vi tn s f = 1/(2 LC t ) D: Dao ng tt dn vi tn s f = 1/2 L CCu 39: Khung dy kim loi phng c din tchS= 100cm2, c N = 500 vng dy, quay u vi tc 3000 vng/pht quay quanh trc vung gc vi ng sc ca mt t trng u B = 0,1T. Chn gc thi gian t = 0s l lc php tuyn n ca khung dy c chiu trng vi chiu ca vect cm ng t B: Biu thc xc nh sut in ng cm ng e xut hin trong khung dy l: A: e = 157cos(314t - t/2) (V).B: e = 157cos(314t) (V). C: e = 15,7cos(314t - t/2) (V). D: e = 15,7cos(314t) (V). Cu 40: Mt my pht in xoay chiu mt pha pht ra sut in ng e = 1000 2 cos(100tt) (V). Nu roto quay vi vn tc 600 vng/pht th s cp cc l: A: 4.B: 5.C: 10.D: 8. Cu 41: My bin th c s vng cun dy s cp nh hn s vng cun dy th cp th my bin th c tc dng g ? A: Tng in p, gim cng dng in. B: Gim in p v tng cng sut s dng in. C: Gim hiu in th, tng cng dng in.D: Tng in p v cng sut s dng in. Cu 42: Chn cu ng nht khi ni v phn cm ca my pht in xoay chiu. A: Phn cm lun l rtoB: Phn to ra dng in xoay chiu l phn cm C: Phn cm lun l statoD: Phn to ra t trng l phn cm Cu 43: Khi chiu mt chm sng hp gm cc nh sng n sc , vng, lc v tm t pha y ti mt bn ca mt lng knh thy tinh c gc chit quang nh. iu chnh gc ti ca chm sng trn sao cho nh sng mu tm l ra khi lng knh c gc lch cc tiu. Khi A:ch c thm tia mu lc c gc lch cc tiu. B: tia mu cng c gc lch cc tiu. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 7 C:ba tia cn li l ra khi lng knh khng c tia no c gc lch cc tiu. D: ba tia , vng v lc khng l ra khi lng knh. Trong th nghim Y-ng v giao thoa nh sng. Bit khong cch gia hai khe l 0,8mm, khong cchCu 44: Chn cu ng.A: Quang ph lin tc ca mt vt ph thuc vo bn cht ca vt nng sng. B: Quang ph lin tc khng ph thuc vo nhit ca vt nng sng. C: Quang ph lin tc ph thuc vo nhit ca vt nng sng. D: Quang ph lin tc ph thuc vo nhit v bn cht ca vt nng sng. Cu 45: Trong hin tng quang in ngoi, ng nng ban u cc i ca cc electrn quang in A: Khng ph thuc vo cng ca chm sng kch thch v bc sng ca nh sng kch thch, m ch ph thuc vo bn cht ca kim loi dng lm catt. B: Khng ph thuc vo bn cht kim loi dng lm catt, m ch ph thuc vo bc sng ca nh sng kch thch v cng ca chm sng kch thch. C: Khng ph thuc vo cng ca chm sng kch thch m ch ph thuc vo bc sng ca nh sng kch thch v bn cht ca kim loi dng lm catt D: Khng ph thuc vo bc sng ca nh sng kch thch, m ch ph thuc vo cng ca chm sng kch thch v bn cht kim loi dng lm catt. Cu 46: Bom nhit hch dng lm phn ng D + T--> He + n + 18MeV. Nu c mt kmol He to thnh th nng lng ta ra l:(khi lng nguyn t bit). A: 23,5.1014J.B: 28,5.1014J. C: 25,5.1014J.D: 17,4.1014J. Cu 47: Thi gian sng trung bnh ca cc ht sau y l ln nht A: PionB: OmegaC: NotronD: Notrino Cu 48: Nng lng ca photon ng vi nh sng c 0, 41 m = l A:4,85.10 19 JB: 5 eV.C: 4,85.10 25 J.D: 2,1 eV. Cu 49: Chiuchmnhsng trng t bng n dy tc nng sngpht ravokhecamy quangph ta s thu c trn tm knh ca bung nh mt quang ph lin tC. Nu trn ng i ca chm nh sng trng ta t mt ngn n hi natri nung nng th trong quang ph lin tc ni trn xut hin A: .Hai vch ti nm st cnh nhauB: Hai vch sng trng nm st cnh nhau C: Hai vch ti nm kh xa nhauD: Hai vch sng vng nm st cnh nhau Cu 50: Ngi ta truyn ti dng in xoay chiu mt pha t nh my in n ni tiu th. Khi in p nh my in l 6kV th hiu sut truyn ti l 73%. hiu sut truyn ti l 97% th in p nh my in l A: 18kVB: 54kVC: 2kVD: p n khc GIO DC HNG PHC S : 03 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1: th vn tc- thi gian ca mt vt dao ng c iu ho c cho nh hnh v. Ta thy: A: Ti thi im t1, gia tc ca vt c gi tr dng B: Ti thi im t4, li ca vt c gi tr dng C: Ti thi im t3, li ca vt c gi tr mD: Ti thi im t2, gia tc ca vt c gi tr m Cu 2:Trong th nghim v giao thoa nh sng I-ng. Nu lm th nghim vi nh sng n sc c bc sng 1 = 0,6m th trn mn quan st, ta thy c 6 vn sng lin tip tri di trn b rng 9mm. Nu lm th nghim vi nh sng hn tp gm hai bc x c bc sng 1 v 2 th ngi ta thy: t mt im M trn mn nvn sng trung tm c 3 vn sng cng mu vi vn sng trung tm v ti M l mt trong 3 vn . Bit M cch vn trung tm 10,8mm , bc sng ca bc x 2 l: A: 0,38m.B: 0,4m.C: 0,76m.D: 0,65m. Cu 3:Bc sng ca cc vch trong vng nhn thy ca quang ph hir l 0,656 m; 0,486m; 0,434 m v 0,410 m. Bc sng di nht ca vch trong dy Pa- sen l A:1,965 mB: 1,675 m C: 1,685mD: 1,875 m Cu 4:Khi m thanh truyn t khng kh vo nc, bc sng v tn s ca m thanh c thay i khng?v t0t1 t2 t3 t4 TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 8 A: Bc sng thay i, nhng tn s khng thay i. B: Bc sng v tn s cng khng thay i.C: Bc sng khng thay i cn tn s thay i. D: Bc sng thay i v tn s cng thay i.Cu 5:Mt vt thc hin ng thi hai dao ng iu ho cng phng cng tn sx1 = cos(2tt + t) (cm), x2 =3 .cos(2tt - t/2) (cm). Phng trnh dao ng tng hp ca vt l A: x = 2.cos(2tt - 2t/3) (cm)B: x = 4.cos(2tt + t/3) (cm) C: x = 2.cos(2tt + t/3) (cm) D: x = 4.cos(2tt + 4t/3) (cm) Cu 6:Mt vt dao ng iu hovi phng trnh 2x Acos( t )cmT 3t t= + . Sau thi gian 7T12 k t thi im ban u vt i c qung ng 10 cm. Bin dao ng l: A: 307 cmB: 6cmC: 4cmD: 5cm Cu 7:Tren mat chat long comot song c, ngi ta quan sat c khoang cach gia 15 nh song lien tiep la3,5m vathi gian song truyen c khoang cach ola7s. Tan socua song nay la: A: 0,25HzB: 0,5HzC: 1HzD: 2Hz Cu 8: Mt si dy n hi c treo thng ng vo mt im c nh. Ngi ta to ra sng dng trn dy vi tn s b nht l f1. li c sng dng, phi tng tn s ti thiu n gi tr f2. T s 21ff bng A: 4. B: 3C: 6.D: 2. Cu 9: Trong qu trnh lan truyn sng in t, vct cm ng t Bv vct in trng Elun lun A: Dao ng vung pha B: Cng phng v vung gc vi phng truyn sng. C: Dao ng cng pha D: Dao ng cng phng vi phng truyn sng. Cu 10: Mt mch dao ng in t t do, in dung ca t in l 1pF. Bit in p cc i trn t in l 10V, cng dng in cc i qua cun cm l 1mA . Mch ny cng hng vi sng in t c bc sng bngA: 188,4m B: 18,84 mC: 60 m D: 600m Cu 11: Mt mch chn sng ca mt my thu v tuyn gm mt cun cm c t cm L bin thin t 0,3H n 12H v mt t in c in dung bin thin t 20pF n 800pF. My ny c th bt c sng in t c bc sng ln nht l: A:184,6m.B:284,6m.C:540m.D:640m. Cu 12: Sng in t c p dng trong thng tin lin lc di nc thuc loi A: sng di.B: sng ngnC: sng trung.D: sng cc ngn. Cu 13: Tnh cht no sau y l tnh cht chung ca tia hng ngoi v tia t ngoi A: lm ion ha khng khB: c tc dng cha bnh ci xng C: lm pht quang mt s cht D: c tc dng ln knh nh Cu 14: Trong th nghim Yng, ngi ta chiu sng 2 khe ng thi bc x mu c bc sng 640 nm v bc x mu lc.Trn mn quan st, ngi ta thy gia hai vn sng cng mu vi vn sng chnh gia c 7 vn mu lcBc sng nh sng mu lc trong th nghim l: A: 540nm B: 580nmC: 500nm D: 560nm Cu 15: Chiu tia sng mu c bc sng 660nm t chn khng sang thu tinh c chit sut n =1,5.Khi tia sng truyn trong thu tinh c mu v bc sng l:A: Mu tm,bc sng 440nmB: Mu ,bc sng 440nmC: Mu tm,bc sng 660nm D: Mu ,bc sng 660nm Cu 16: Hiu in th hm trong t bo quang in khng ph thuc vo A:Bn cht ca kim loi lm catt. B:Bc sng ca chm sng kch thch. C:Tn s ca phtn ti. D:Cng ca chm sng kch thch. Cu 17: Mt c im ca s pht quang l A: mi vt khi kch thch n mt nhit thch hp th s pht quang. B: Quang ph ca vt pht quang ph thuc vo nh sng kch thch. C: Quang ph ca vt pht quang l quang ph lin tc D: Bc x pht quang l bc x ring ca vt. Cu 18: Tm cu pht biu ng. Trong hin tng quang in: A: ng nng ban u cc i ca lctrn quang in t l thun vi bc sng nh sng kch thch. B: c dng quang in th hiu in th gia ant v catt phi ln hn hoc bng 0. C: Hiu in th hm bin thin ngc chiu vi bc sng nh sng kch thch. D: Gii hn quang in ph thuc vo tc phtn p vo catt. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 9 Cu 19: Ht o l ht nhn ca nguyn t Heli42 He. Bit khi lng ht proton l m p = 1,0073 u,khi lng notron l m u = 1,0087u v khi lng htnhn o l m o = 4,0015u. Ly N A = 6,02. 10-23 mol-1 . Nng lng ta ra khi to thnh mt mol heli ( do s kt hp cc nuclon thnh ht nhn o ) l: A: E = 2,73.1012 JB: E = 1,5. 1014 JC: E = 8,4. 1010 JD: E = 6,9. 1016 J Cu 20: Mt mu cht phng x c khi lng 0m , chu k bn r bng 3,8 ngy. Sau 11,4 ngy khi lng cht phng x cn li trong mu l 2,5g. Khi lng ban u 0mbng: A: 10g B: 12gC: 20gD: 25g Cu 21: Cho ht proton bn ph ht nhn Li, sau phn ng ta thu c hai ht o. Cho bit mp = 1,0073u; mo = 4,0015u. v mLi = 7,0144u. Phn ng ny ta hay thu nng lng bao nhiu? A: Phn ng ta nng lng 17,41MeV.B:Phn ng thu nng lng 17,41MeV. C: Phn ng ta nng lng 15MeV.D:Phn ng thu nng lng 15MeV. Cu 22: Mt ht nhn c khi lng m = 5,0675.10-27kg ang chuyn ng vi ng nng 4,78MeV. ng lng ca ht nhn lA: 2,4.10-20kg.m/s.B:3,875.10-20kg.m/sC:8,8.10-20kg.m/s.D: 7,75.10-20kg.m/s. Cu 23: Tng tc gia cc nuclon trong ht nhn A: Tng tc in tB: Tng tc yuC: Tng tc hp dnD: Tng tc mnh Cu 24: Khi trong on mch xoay chiu gm in tr R, cun dy thun cm c t cm L v t in c in dung C, mc ni tip m h s cng sut ca mch l 0,5. Pht biu no sau y l ng: A: Cng dng in trong mch lch pha t/6 so vi hiu in th hai u on mch. B: Hiu in th hai u in tr R lch pha t/3 so vi hiu in th hai u on mch. C: Lin h gia tng tr on mch v in tr R l Z = 4R. D: on mch phi c tnh cm khng. Cu 25: Mt ng c khng ng b ba pha c hiu in th nh mc mi pha l 200V. Bit rng cng sut ca ng c 5,61kW v h s cng sut bng 0,85. Cng dng in hiu dng qua mi cun dy ca ng c l: A: 42,4AB: 30AC: 10AD: 14 2 A Cu 26: on mch R , L , C mc ni tip c R = 40O; L = 15tH; C= 3106tF. t vo hai u mch in pu = 1202 cos 100 t t (V). Cng dng in tc thi trong mch l A: i = 1,5cos(100 t t+t/4) (A).B: i = 1,52 cos(100 tt -t/4) (A). C: i = 3 cos(100 t t+t /4) (A).D: i = 3 cos(100 tt -t/4) (A). Cu 27: Mt my bin p l tng c cun s cp gm 2000 vng v cun th cp gm 100 vng. in p v cng mch s cp l 220 V; 0,8 A: in p v cng cun th cp l A: 11 V; 0,04 AB: 1100 V; 0,04 AC: 11 V; 16 A D: 22 V; 16 A Cu 28: Trc tri t quay quanh mnh n nghing trn mt phng vi gn trn mt gc A: 20o 27B: 21o 27C: 22o 27D: 23o 27 Cu 29: Mc nng lng En trong nguyn t hir c xc nh En = 20nE(trong n l s nguyn dng, E0 l nng lng ng vi trng thi c bn). Khi lectron nhy t qu o L v qu o K th nguyn t hir pht ra bc x c bc sng 0 . Bc sng ca vchHo l:A: 5,4 .0 B: 3,2 .0C: 4,8 .0 D: 1,5 .0Cu 30: Mch dao ng bt tn hiu ca mt my thu v tuyn gm mt cun cm c h s t cm L = 2F v mt t in. my thu bt c sng v tuyn c bc sng = 16m th t in phi c in dung bng bao nhiu? A:36pF .B:320pF.C:17,5pF.D:160pF. Cu 31: Ti mtnc c 2 ngun pht sng kt hp S1, S2 c cng bin dao ng theo phng thng ng v ng pha vi nhau, to ra s giao thoa sng trn mt nc Khong cch hai ngun S1S2 = 4 cm, bc sng l 2mm, coi bin sng khng i. M l 1 im trn mt nc cch 2 ngun ln lt l 3,25 cm v 6,75 cm. Ti M cc phn t cht lng A:ng yn B:dao ng mnh nhtC:dao ng cng pha vi S1S2D:dao ng ngcpha vi S1S2 Cu 32: Mt vt tham gia ng thi hai dao ng iu ho cng phng x1 = 2.sin(10t - t/3) (cm); x2 = cos(10t + t/6) (cm) . Vn tc cc i ca vt lA: 5 cm/sB: 20 cm/sC: 1 cm/s D: 10 cm/s Cu 33: Mt con lc l xo nm ngang c k=400N/m; m=100g; ly g=10m/s2; h s ma st gia vt v mt sn l =0,02. Lc u a vt ti v tr cch v tr cn bng 4cm ri bung nh. Qung ng vt i c t lc bt u dao ng n lc dng li l: A: 1,6mB: 16m.C: 16cmD: p n khc Cu 34: Vt dao ng iu ha vi phng trnh: x = 20cos(2tt - t/2)(cm) . Gia tc ca vt ti thi im t = 1/12 s l A: - 4 m/s2 B: 2 m/s2 C: 9,8 m/s2 D: 10 m/s2Cu 35: Mt con lc l xo, gm l xo nh c cng 50 N/m, vt c khi lng 2 kg, dao ng iu ho theo phng thng ng. Ti thi im vt c gia tc 75 cm/s2 th n c vn tc 15 3cm/s. Bin dao ng l A: 5 cmB: 6 cm C: 9 cm D: 10 cm Cu 36: Mch dao ng ca 1 my thu v tuyn in gm1 cun dy c t cm l L bin thin t 1H n100 H v 1 t c in dung C bin thin t 100pF n 500pF. My thu c th bt c nhng sng trong di bc sng : A:22,5 mn 533mB: 13,5 mn 421 C:18,8 mn 421mD: 18,8 m n 625 m TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 10 Cu 37: iu no sau y l sai khi ni v nguyn tc pht v thu sng in t? A: pht sng in t, ngi ta mc phi hp mt my pht dao ng iu ho vi mt ng ten. B: Dao ng in t thu c t mch chn sng l dao ng t do vi tn s bng tn s ring ca mch.C: thu sng in t ngi ta phi hp mtng tenvi mt mch dao ng. D: Daong in t thu c t mch chn sng l dao ng cng bc c tn s bng tn s ca sng. Cu 38: Trn 1 dy di c sng truyn vi vn tc 10m/s. Phng trnh dao ng ti ngun S l u = 5sin 100 t (cm). Phng trnh dao ng ti M cch S mt khong 4 cm l A: u = 5sin (100 t + 2) (cm)B: u = 5sin 100 t (cm)C: u = 5cos (100 t + 2) (cm)D: u = 5sin (100 t 0,4 )(cm) Cu 39: Tc lan truyn ca sng in t . A: Khng ph thuc vo mi trng truyn sng nhng ph thuc vo tn s ca sng B: Khng ph thuc vo c mi trng truyn sng v tn s ca sng C: Ph thuc vo c mi trng truyn sng v tn s ca sng D: Ph thuc vo mi trng truyn sng v khng ph thuc tn s ca sng Cu 40: Chn cu ng: A.Nguyn tc pht quang ca laze da trn vic ng dng hin tng pht x cm ng. B.Tia laze c nng lng ln v bc sng ca tia laze rt nh. C.Tia laze c cng ln v c tnh n sc cao. D.Tia laze c tnh nh hng rt cao nhng khng kt hp (khng cng pha). Cu 41: Hiu in th gia hai u mt on mch xoay chiu v cng dng in qua mch ln lt c biu thc u = 100 2 sin(et + t/3)(V) v i = 4 2 cos(100tt - t/6)(A), cng sut tiu th ca on mch l: A: 200 3 W.B: 0C: 400W.D: 200W. Cu 42: Chn cu sai:A:Tiagy nguy hi cho c th B:vn tc tia bng vn tc nh sng C: Tiakhng b lch trong t trng v in trngD: Tiac bc sng ln hn tia Rnghen nn nng lng ln hn tia RnghenCu 43: Mt con lc l xo gm l xo nh c cng 100 (N/m) v vt nh c khi lng 250 (g), dao ng iu ho vi bin 6 (cm). Ban u vt i qua v tr cn bng, sau 7t/120 (s) vt i c qung ng diA: 9 cmB: 15cm C: 3 cmD: 14 cm Cu 44: Mt con lc l xo c treo thng ng, u trn c nh, u di gn vt nh. Khi vt trng thi cn bng, l xo gin on 2,5 cm. Cho con lc l xo dao ng iu ho theo phng thng ng. Trong qu trnh con lc dao ng, chiu di ca l xo thay i trong khong t 25 cm n 30 cm. Ly g = 10 m.s-2. Vn tc cc i ca vt trong qu trnh dao ng l A:100 cm/sB:50 cm/s C:5 cm/s D: 10 cm/ Cu 45: Khi ni v qu trnh sng in t, iu no sau y l khng ng? A:Trong qu trnh lan truyn, n mang theo nng lng. B:Vct cng in trng v vct cm ng t lun vung gc vi phng truyn sng. C:Trong qu trnh truyn sng, in trng v t trng lun dao ng vung pha nhau. D:Trong chn khng, bc sng ca sng in t t l nghch vi tn s sng. Cu 46: Trong th nghim giao thoa nh sng bng khe Y-ng, ngun pht ra nh sng n sc c bc sng . Khong vn i o c trn mn s tng ln khi A: tnh tin mn li gn hai khe. B: thay nh sng trn bng nh sng khc c bc sng ' > .C: tng khong cch hai khe.D: t c h thng vo mi trng c chit sut ln hn. Cu 47: Mt ht c ng nng bng nng lng ngh. Vn tc ca n l : A:c 3 / 2B: 0,6cC: 0,8cD: 0,5c Cu 48: Dng in chy qua mt on mch c biu thc i =2 cos(100tt - t/2)(A), t tnh bng giy (s). Trong khong thi gian t 0(s) n 0,01 (s), cng tc thi ca dng in c gi tr bng cng hiu dng vo nhng thi im: A: 1s200 v 3s200.B: 1s400 v .C: 1600 sv 3600 s .D: 1600 sv 5600 s . Cu 49: Mt mch dao ng LC camythu vtuyn cng hng vi sng in t c bc sng . my ny c th thu c sng in t c bc sng 2 ngi taghp thm 1 t nA:Hi t ghp thm phi ghp th no v c in dung l bao nhiu? A: Ghp ni tip vi t C v c in dung 3C B: Ghp ni tip vi t C v c in dung CC: Ghp song song vi t C v c in dung 3C D: Ghp song song vi t C v c in dung C Cu 50: Sng no c dng trong truyn hnh bng sng v tuyn in: A: Sng ngnB: Sng diC: Sng cc ngnD: Sng trung TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 11 GIO DC HNG PHC S : 04 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1:Mt vt dao ng iu ho, c sau mt khong thi gian 2,5s th ng nng li bng th nng. Tn s dao ng ca vt l A: 0,1 HzB: 0,05 HzC: 5 HzD: 2 Hz Cu 2:Mt vt dao ng iu ho, thi im th hai vt c ng nng bng ba ln th nng k t lc vt c li cc i l 215 s . Chu k dao ng ca vt l A: 0,8 sB: 0,2 sC: 0,4 sD: p n khcCu 3:Mt my thu thanh ang thu sng ngn. chuyn sang thu sng trung bnh, c th thc hin gii php no sau y trong mch dao ng anten A: Gi nguyn L v gim CB: Gim C v gim L. C: . Gi nguyn C v gim L.D: Tng L v tng C: Cu 4:Mot mach dao ong i en t, tuien coien dung 40nF, th mach cotan so2.104 Hz. emach cotan so104Hz th phai mac themtui en cogiatr A: 40nF song song vi tuien trcB: 120nF song song vi tuien trc C: 40nF noi tiep vi tuien trcD: 120nF noi tiep vi tuien tr c Cu 5:Sng in t no sau y c dng trong vic truyn thng tin ra v tr A: Sng ngn.B: Sng cc ngn.C: Sng trung.D: Sng di. Cu 6:Khi m truyn t khng kh vo nc , buc sng ca n thay i th no? Cho bit vn tc m trong nc l 1550 m/s, trong khng kh l 340 m/s. A: Khng thay i B: Gim i 4,56 lnC: Tng ln 4,56 ln D: Tng ln 1210 m Cu 7:Mt con lc l xo thng ng dao ng iu ho vi bin 10cm. Trong qu trnh dao ng t s lc n hi cc i v cc tiu ca l xo l 133, ly g=t2m/s. Chu k dao ng ca vt l A: 1 sB: 0,8 sC: 0,5 sD: p n khcCu 8:Chn cu sai khi ni v MP xoay chiu ba pha v ng c khng ng b ba pha A: C hai u c ba cun dy ging nhau gn trn phn v my v t lch nhau 1200.B: ng c khng ng b ba pha c rto l mt s khung dy dn knC: My pht in ba pha c rto l mt nam chm in v ta phi tn cng c hc lm n quay. D: ng c khng ng b ba pha c ba cun dy ca stato l phn ng. Cu 9:Chn cu sai. A: My pht in c cng sut ln th rto l cc nam chm in B: MP m rto l phn cm th khng cn c b gp.C: Trong MP, cc cun dy ca phn cm v phn ng u c qun trn li thp D: Vi my pht in xoay chiu mt pha th nam chm phi l nam chm in Cu 10: Mt ng c in xoay chiu ca my git tiu th in cng sut 440 W vi h s cng sut 0,8, in p hiu dng ca li in l 220 V. Cng hiu dng chy qua ng c l A: 2,5 A B: 3 AC: 6 A D: 1,8 ACu 11: Mt my pht inxoay chiu mt pha c rto gm 4 cp cc t, mun tn s dng in xoay chiu pht ra l 50 Hz th rtophi quay vi tc lA: 750 vng/pht B: 3000 vng/phtC: 500 vng/phtD: 1500 vng/pht Cu 12: Mt cun dy c 200 vng, din tch mi vng 300 cm2, c t trong mt t trng u, cm ng t 0,015 T. Cun dy c th quay quanh mt trc i xng ca n, vung gc vi t trng th sut in ng cc i xut hin trong cun dy l 7,1 V. Tc gc l A: 78 rad/s B: 79 rad/s C: 80 rad/s D: 77 rad/s Cu 13: on mch gmbin tr R mc ni tip vi mt t c in dung 0,1/t (mF). t vo hai u on mch mt in p xoay chiu n nh c tn s 50 Hz. Thay i R ngi ta thy vi 2 gi tr ca R l R1 v R2 th cng sut ca mch bng nhau. Tch R1.R2 bngA: 10 O2B: 100 O2 C: 1000 O2D: 10000 O2 Cu 14: Chiu ng thi ba bc x n sc c bc sng 0,4m; 0,48m v 0,6m vo hai khe ca th nghim Ing. Bit khong cch gia hai khe l 1,2mm, khong cch t hai khe ti mn l 3m. Khong cch ngn nht gia hai v tr c mu cng mu vi vn sng trung tm l: A: 12mmB: 8mmC: 24mmD: 6mm Cu 15: Chn pht biu sai khi ni v nh sng n sc. A: nh sng n sc l nh sng c mu sc xc nh trong mi mi trng. B: nh sng n sc l nh sng c tn s xc nh trong mi mi trng. C: nh sng n sc l nh sng khng b tn sc. D: nh sng n sc l nh sng c bc sng xc nh trong mi mi trng. Cu 16: Mch nh hnhv, C = 318(F), Rbin i.Cun dy thun cm, inp hai u mch 0sin100 u U t t = (V),cngsuttiuthcamchtgitrccikhiR=R0= 50(O). Cm khng ca cun dy bng: R CL TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 12 A: 40(O)B: 100(O) C: 60(O)D: 80(O) Cu 17: Hp kn (c cha t C hoc cun dy thun cm L) c mc ni tip vi in tr R = 40(O). Khi t vo on mch xoay chiu tn s f = 50(Hz) th hiu in th sm pha 45 so vi dng in trong mch. t cm L hoc in dung C ca hp kn l: A: 3104t(F) B: 0,127(H)C: 0,1(H)D: 3.104t(F)Cu 18: Chn cu tr li sai.nh sng n sc l nh sng A: C mt mu xc nh. B: Khng b tn sc khi i qua lng knh. C: C vn tc khng i khi truyn t mi trng ny sang mi trng kia D: B khc x qua lng knh. Cu 19: iu no sau y l sai khi so snh tia hng ngoi vi tia t ngoi? A: Tia hng ngoi v tia t ngoi u tc dng ln knh nh; B: Cng bn cht l sng in t; C: Tia hng ngoi c bc sng nh hn bc sng tia t ngoi; D: Tia hng ngoi v tia t ngoi u khng nhn thy bng mt thng. Cu 20: Quang ph vch hp th l quang ph gm nhng vch: A: mu bin i lin tc .B: ti trn nn sng . C: mu ring bit trn mt nn ti .D: ti trn nn quang ph lin tc Cu 21: ng nng ca lectron bt ra khi mt kim loi trong hiu ng quang in khng ph thuc vo 1. Tn s ca nh sng chiu vo kim loi. 2. Cng nh sng chiu vo. 3. Din tch kim loi c chiu sng. Nhng kt lun no ng? B: 1 v 2.C: 3 v 1.D: 2 v 3A: Khng p n Cu 22: Cng thot ca lectron ra khi b mt catt ca mt t bo quang in l 2eV. Nng lng ca photon chiu ti l 6eV. Hiu in th hm cn t vo t bo quang in l bao nhiu c th lm trit tiu dng quang in A: - 4V.B: - 8V.C: - 3V.D: - 2V. Cu 23: Khi chiu mt chm sng trng song song trc khi vo catt ca mt t bo quang in, ngi ta t ln lt cc tm knh lc sc ly ra cc thnh phn n sc khc nhau v nhn thy khi dng knh mu lam, hin tng quang in bt u xy ra Nu ct knh lc sc th cng dng quang in thay i nh th no so vi khi dng knh mt mu no ? A: Tng ln. B: Gim xung. C: Khng thay i.D: Tng hoc gim tu theo mu dng trc Cu 24: Vch quang ph c tn s nh nht trong dy Ban-me l tn s f 1 , Vch c tn s nh nht trong dy Lai-man l tn s 2f . Vch quang ph trong dy Lai-man sat vi vch c tn s 2fs c tn s bao nhiu A: f 1 + f 2B: f 1 .f 2C: f 1.f 2f+f 2 D: f 1.f 2f 1-f 2 . Cu 25: Khi lng ca e l m e = 5,486.10-4 u. Tnh khi lng e ra MeV/c2 . Bit 1u = 931,5MeV/c2 A: 0,5B: 1C: 0,51D: 0,55 Cu 26: Mt vt c khi lng ngh m o = 1kg. Khi chuyn ng vi vn tc v = 0,6c th khi lng ca n l bao nhiu? A: khng iB: 1,25kgC: 0,8kgD: khng p n Cu 27: Chn cu ng. Co50 c chu k bn r 5,33 nm. phng x ban u ca 1kg cht l: A:4,9.1016Bq. B: 3,2.1016Bq.C: 6,0.1016Bq.D: 4,0.1016Bq. Cu 28: Sau khi c tch ra t ht nhn 42He , tng khi lng ca 2 prtn v 2 ntrn ln hn khi lnght nhn42 He mt lng l 0,0305u. Nu 1u = 9312MeVc, nng lng ng vi mi nucln, tch chng ra khi ht nhn 4He l bao nhiu? A: 7,098875MeV.B: 2,745.1015J.C: 28,3955MeV.D: 0.2745.1016MeV. Cu 29: Cc barion l t hp ca A: 6 quacB: 4 quacC: 2 quac D: 3 quc Cu 30: Pht biu no sau y l ng? A: Dao ng duy tr l dao ng tt dn m ngi ta kch thch li dao ng sau khi dao ng b tt hn. B: Dao ng duy tr l dao ng tt dn m ngi ta lm mt lc cn ca mi trng i vi vt dao ng. C: Dao ng duy tr l dao ng tt dn m ngi ta tc dng ngoi lc vo vt dao ng cng chiu vi chiu chuyn ng trong mt phn ca tng chu k. D: Dao ng duy tr l dao ng tt dn m ngi ta tc dng ngoi lc bin i iu ho theo thi gian vo vt dao ng. Cu 31: Mt con lc n di 56 cm c treo vo trn mt toa xe lA: Con lc b kch ng mi khi bnh ca toa xe gp ch ni nhau ca cc thanh ray. Ly g = 9,8m/s2. Cho bit chiu di ca mi thay ray l 12,5m. Bin dao ng ca con lc s ln nht khi tu chy thng u vi tc A: 40 km/hB: 72 km/hC: 24km/hD: 30 km/h Cu 32: Mt sng c hc lan truyn trn mt phng truyn sng. Phng trnh sng ca mt im M trn phng truyn sng l: uM = 3cost t (cm). Phng trnh sng ca mt im N trn phng truyn sng ( MN = 25 cm)l: uN = 3 cos (t t +t /4) (cm). Ta c A Sng truyn t M n N vi vn tc 2m/s. B: Sng truyn t N n M vi vn tc 2m/s. C: Sng tuyn t N n M vi vn tc 1m/s.D: Sng tuyn t M n N vi vn tc 1m/s. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 13 Cu 33: Biet toc otruyen song trong chan khong la3.108 m/s, chiet suat cua nc l a4/3. Mot song ien tcotan so12MHz. Khi truyen trong nc nocobc song la: A: 18,75mB: 37,5mC: 4,6875mD: 9,375m Cu 34: in p gia hai u mt on mch RLC ni tip sm pha t/4 so vi cng dng in. Khi A: tn s dng in trong on mch nh hn gi tr cn xy ra cng hng.B: tng tr ca on mch bng hai ln in tr thun ca mch.C: hiu s gia cm khng v dung khng bng in tr thun ca on mch. D:in p gia hai u in tr thun sm pha t/4 so vi in p gia hai bn t in. Cu 35: Pht biu no sau y l ng? A: Quang tr l mt linh kin bn dn hot ng da trn hin tng quang in trong. B: Quang tr l mt linh kin bn dn hot ng da trn hin tng quang in ngoi. C: in tr ca quang tr tng nhanh khi quang tr c chiu sng. D: in tr ca quang tr khng i khi quang tr c chiu sng bng nh sng c bc sng ngn Cu 36: Catt ca t bo quang in lm bng vnfram. Cng thot lectron i vi vnfram l 7,2.10-19 J. Gii hn quang in ca vnfram lA: 0,375 m.B: 0,425 m.C: 0,475 m.D:0,276m. Cu 37: Chn cu ng. Cht It phng x I.131 c chu k bn r l 8 ngy. Nu nhn c 100g cht ny th sau 8 tun khi lng ca n cn li l: A: 0,78g.B: 0,19g.C: 2,04g. D: 1,09g. Cu 38: Tm pht biu sai v cc thin h A:Cc sao tn ti trong v tr thnh nhng h h tng i lp vi nhau. Mi h nh vy gm hng chc sao, c gi l thin h B:Thin h xon c c hnh dng dt nh ci a, c nhng cnh tay xon c C:Thin H elip c khi lng tri rng v l nhng ngun pht sng v tuyn rt mnh D:Thin h khng nh hnh trng nh nhng m my.Cu 39: Mtvtngthithamgiabadaongiuhacngphngcphngtrnhdaong: 12 3 sin(2 / 3)( ) x t cm t t = + , 24sin(2 / 6)( ) x t cm t t = + , 38sin(2 / 2)( ) x t cm t t = . Gi tr vn tc cc i ca vt v pha ban u ca dao ng tng hp l: A: 16 ( / ) / 6 cm sv rad t t B: 16 ( / ) / 6 cm sv rad t tC: 12 ( / ) / 3 cmsv rad t tD: 12 ( / ) / 6 cmsv rad t t Cu 40: Mt con lc n dao ng iu ha vi bin gc 05 o =. Vi li gc bng bao nhiu th ng nng ca con lc gp hai ln th nng? A:2, 89 o =B:2, 89 o = C:4, 35 o = D:3, 45 o = Cu 41: Chon cau sai.A: Song i en tcothebphan xakhi gap cac bemat.B: Toc otruyen song ien ttrong cac moi trng khac nhau th khac nhau.C: Tan socua mot song ien tlaln nha t khi truyen trong chan khong D: Song ien tcothetruyen qua nhi eu loai vat lieu. Cu 42: Thc hin sng dng trn dy AB c chiu divi u B c nh, u A dao ng theo phng trnhcos 2 . u a ft t =Gi M l im cch B mt on d, bc sng l , k l cc s nguyn. Khng nh no sau y l sai? A:V tr cc nt sng c xc nh bi cng thc d = k.2 B:V tr cc bng sng c xc nh bi cng thc d = (2k + 1).2 C:Khong cch gia hai bng sng lin tip l d = 2. D:Khong cch gia mt nt sng v mt bng sng lin tip ld = 4. Cu 43: Mt n ng c mc vo mng in xoay chiu tn s f = 50(Hz), U = 220(V). Bit rng n ch sng khi hiu in th gia hai cc ca n t gi tr u > 155(V). Trong mt chu k thi gian n sng l: A: 1100(s)B: 2100(s)C: 4300(s)D: 5100(s) Cu 44: Mt on mch gm cun dy c in tr thun 100 3O, c t cm L ni tip vi t in c in dung 0,00005/t (F). t vo hai u on mch mt in p xoay chiu u = U0cos(100tt - t/4) (V) th biu thc cng dng in qua mch i =2 cos(100tt - t/12) (A). Ga tr ca L l A: L = 0,4/t (H)B: L = 0,6/t (H)C: L = 1/t (H) D: L = 0,5/t (H)Cu 45: Chiu ln lt hai bc x n sc c bc sng 1v 2 vo catot ca TBQ. Cc electron bt ra vi vn tc ban u cc i ln lt l v1 v v2 vi v1= 2v2 . T s cc hiu in th hm Uh1/Uh2 cc dng quang in trit tiu l:A: 4 B: 3 C: 2 D: 5 TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 14 Cu 46: Cho ht bn ph vo ht nhn nhm(2713Al ) ang ng yn, sau phn ng sinh ra ht ntron v ht nhn X. , bit m =4.0015u, mAl = 26,974u, mX = 29,970u, mn = 1,0087u, 1uc2 = 931MeV. Phn ng ny to hay thu bao nhiu nng lng? Chn kt qu ng? A:To nnglng 2,9792MeV.B:To nnglng 2,9466MeV. C:Thu nnglng 2,9792MeV.D:Thu nnglng 2,9466MeV. Cu 47: Mt con lc n c chiu di dy treo bng1, 6 l m =dao ng iu ha vi chu k T. Nu ct bt dy treo i mt on 10, 7 l m =th chu k dao ng by gi l 13 T s = . Nu ct tip dy treo i mt on na 20, 5 l m =th chu k dao ng by gi 2Tbng bao nhiu ? A: 2sB: 3sC: 1,5sD: 1s Cu 48: Mtvtdaong iuho,khivt c li x1=4cm thvntc 140 3 / v cm s t = ; khivtc li 24 2 x cm =thvn tc 240 2 / v cm s t = . Chu k ca con lc l? A: 0,4 sB: 0,2 sC: 0,8 sD: 0,1 s Cu 49: Trong th nghim giao thoa sng trn mt nc, hai ngun AB cch nhau 9,4cm dao ng cng pha im M trn mt nc thuc on AB cch trung im ca AB mt khong gn nht l 0,5cm v lun khng dao ng. S im dao ng cc i trn AB lA: 10B: 7C: 9D: 11 Cu 50: Trong qu trnh dao ng iu ha ca con lc n. Nhn nh no sau y l sai? A: Khi qu nng im gii hn, lc cng dy treo c c ln ca nh hn trng lng ca vt B: ln ca lc cng dy treo con lc lun ln hn trng lng vt. C: Chu k dao ng ca con lc khng ph thuc vo bin dao ng ca n. D: Khi khi gc hp bi phng dy treo con lc v phng thng ng gim, tc ca qu nng s tng. GIO DC HNG PHC S : 05 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1:Mt con lc n, ban u dy treo lch khi phng thng ng mt gc030 o = v th cho dao ng. B qua mi ma st v lc cn, dao ng ca con lc l A: dao ng tun hon.B: dao ng iu ho.C: dao ng duy tr.D: dao ng tt dn. Cu 2:Conlclxotreovogicnh,khilngvtnnglm=100g.Conlcdaongiuhotheophngtrnh:x= 4cos(10 5 t) cm. Ly g = 10 m/s2. Lc n hi cc i v cc tiu tc dng ln gi treo cgi tr l: A: FMAX = 3N; Fmin= 0NB: FMAX = 3N; Fmin = 1NC: FMAX = 4N; Fmin= 2ND: FMAX = 4N; Fmin =1N Cu 3:Tm pht biu sai v sng in t: A: Cc vect E v B cng tn s v cng pha B: Cc vect E v B cng phng, cng tn s. C: Sng in t truyn c trong chn khng vi vn tc truyn v ~ 3.108 m/s. D: Mch LC h v s phng in l cc ngun pht sng in t. Cu 4:Chn cu ng . A:Nhng im cch nhau mt bc sng th dao ng cng pha B:Nhng im nm trn phng truyn sng v cch nhau mt s nguyn ln bc sng th dao ng cng phaC:Nhng im cch nhau na bc sng th dao ng ngc pha D:Nhng im cch nhau mt s nguynna bc sng th dao ng ngc pha Cu 5:Biu thc sng ca im M trn dy n hi c dng u = Acos2t (2t-20x) cm.Trong x tnh bng cm, t tnh bng giy.Trong khong thi gian 2s sng truyn c qung ng l: A: 20cm B: 40cm.C: 80cmD: 60cm Cu 6:Cng sut m thanh cc i ca mt my nghe nhc gia nh l 10W. Cho rng c truyn trn khong cch 1m, nng lng m b gim 5 % so vi ln u do s hp th ca mi trng truyn m.Bit I0 = 10-12 W/m2, Nu m to ht c th mc cng m khong cch 6 m l A: 102 dBB: 107 dBC: 98 dB D: 89 dB Cu 7:Khe sng ca ng chun trc ca my quang ph c t ti A: quang tm ca thu knh hi t B: tiu im nh ca thu knh hi t C: ti mt im trn trc chnh ca thu knh hi t D: tiu im vt ca thu knh hi t TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 15 CLA NR BMCu 8:Trong th nghim giao thoa nh sng ca I-ng. Hai khe hp cch nhau 1mm, khong cch t mn quan st n mn cha hai khe hp l 1,25m. nh sng dng trong th nghim gm hai nh sng n sc c bc sng 1 = 0,64m v 2 = 0,48m. Khong cch t vn sng trung tm n vn sng cng mu vi n v gn n nht l: A: 3,6mm.B: 4,8mm.C: 1,2mm.D: 2,4mm. Cu 9:Trong th nghim Ing v giao thoa nh sng trng c bc sng t 0,4 m n 0,76 m, b rng quang ph bc 3 thu c trn mn l 2,16mm. Khong cch t hai khe S1S2 n mn l 1,9m. Tm khong cch gia hai khe S1,

S2. A: a = 0,95mmB: a = 0,75mmC: a = 1,2mmD: a = 0,9mm Cu 10: Mt khung dy quay u trong t trngB vung gc vi trc quay ca khung vi tc n = 1800 vng/ pht. Ti thi im t = 0, vct php tuynn ca mt phng khung dy hp viB mt gc 300. T thng cc i gi qua khung dy l 0,01WB. Biu thc ca sut in ng cm ng xut hin trong khung lA: 0, 6 cos(30 )6e t Vtt t = B:0, 6 cos(60 )3e t Vtt t = . C: 0, 6 cos(60 )6e t Vtt t = + .D:60 cos(30 )3e t Vt= + . Cu 11: Cho on mch nh hnh v. Khi t vo hai u mch mt in p c biu thc u = 120 2 cos100t t(V) th thy in p gia hai u on NB v in p gia u on AN v c cng mt gi tr hiu dng v trong mch ang c cng hng in. in p hiu dng gia hai u in tr R l A:30 2 V.B:60 2 V.C:30V.D:60VCu 12: t vo hai u mch in xoay chiu gm mt cun dy v mt t in mc ni tip mt in p xoay chiu n nh c biu thc u =100 6 cos(100 )( ).4t Vtt +Dng vn k c in tr rt ln ln lt o in p gia hai u cun cm v hai bn t in th thy chng c gi tr ln lt l 100V v 200V. Biu thc in p gia hai u cun dy l: A: 100 2 cos(100 )( )2du t Vtt = + .B: 200 cos(100 )( )4du t Vtt = + . C:3200 2 cos(100 )( )4du t Vtt = + .D:3100 2 cos(100 )( )4du t Vtt = + . Cu 13: Chomchinnhhnhv 050 3 R = O,50L CZ Z = = O ;AMUv MBU lch pha 750. in tr R c gi trl A:25 3OB: 50OC: 25OD: 50 3O Cu 14: Ht nhn 6027Coc khi lng l 59,940(u), bit khi lng proton: 1,0073(u), khi lng ntron l 1,0087(u), nng lng lin kt ring ca ht nhn 60Co l(1 u = 931MeV/c2): A: 10,26(MeV) B: 12,44(MeV)C: 8,53(MeV)D: 8,44(MeV Cu 15: Ht nhn teri 21 Dckhi lng2,0136u. Bitkhilngcaprton l 1,0073uvkhi lngca ntron l 1,0087u. Nng lng lin kt ring ca ht nhn 21 DlA: 1,86MeVB: 2,23MeVC: 1,12MeVD: 2,02MeV Cu 16: Mt nh my in nguyn t dng U235 phn hch ta ra 200MeV. Hiu sut ca nh my l 30%. Nu cng sut ca nh my l 1920MW th khi lng U235 cn dng trong mt ngy : A0,674kg.B: 1,050kg. C: 2,596kg.D: 6,74kg Cu 17: Cc ht s cp no sau y c khi lng ngh bng khng? A: Ntron, photonB: Photon, notrinoC: Electron, pozitronD: Mezon Cu 18: Catt ca mt t bo quang in lm bng vnfram. Bit cng thot ca electron i vi vnfram l 7,2.10-19J v bc sng ca nh sng kch thch l 0,180m. trit tiu hon ton dng quang in, phi t vo hai u ant v catt mt hiu in th hm c gi tr tuyt i l A: Uh = 3,50VB: Uh = 2,40VC: Uh = 4,50VD: Uh = 6,62V Cu 19: Pht biu no sau y l sai vi ni dung hai gi thuyt ca Bo? A: Nguyn t c nng lng xc nh khi nguyn t trng thi dng. B: Trong cc trng thi dng, nguyn t khng bc x hay hp th nng lng. C: Khi chuyn t trng thi dng c nng lng thp sang trng thi dng c nng lng cao nguyn t s pht ra phtn. D: cc trng thi dng khc nhau nng lng ca cc nguyn t c gi tr khc nhau. Cu 20: Hiu in th hai cc ca mt ng Rnghen l 4,8kV. Bc sng ngn nht ca tia X m ng c th pht ra l A: 0,134nmB: 1,256nmC: 0,447nmD: 0,259nm Cu 21: Hadon l tn gi ca ht s cp no: A: Photon, leptonB: Lepton, mezonC: Mezon, barionD: Nuclon, hiperon Cu 22: iu kin no sau y phi tha mn con lc n dao ng iu ha? A: Bin nh v khng c ma st.B: Khng c ma st. B L, R0 RC MA TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 16 C: Bin dao ng nh.D: chu k khng thay i. Cu 23: Mt cht im thc hin ng thi hai dao ng iu ha cng phng x1 = 8cos2t (cm) ;x2 = 6cos(2t +/2) (cm). Vn tc cc i ca vt trong dao ng l A: 60 (cm/s).B: 20t(cm/s).C: 120 (cm/s).D: 4t(cm/s). Cu 24: Mt si dy n di 60 cm, cng gia hai im c nh, khi dy n dao ng vi tn s f= 500 Hz th trn dy c sng dng vi 4 bng sng. Vn tc truyn sng trn dy l: A: 50 m/s.B: 100m/s.C: 25 m/s.D: 150 m/s. Cu 25: Bc x t ngoi l bc x in t A: C bc sng nh hn bc sng ca tia x B: C tn s thp hn so vi bc x hng ngoi C: C tn s ln hn so vi nh sng nhn thy D: C bc sng ln hn bc sng ca bc x tm Cu 26: Mt mch in xoay chiu gm mt cun dy v mt t in c in dung thay i c mc ni tip. t vo hai u mch in ny mt in p xoay chiu c tn s v in p hiu dng khng i, iu chnh in dung ca t sao cho in p hiu dng gia hai bn t c gi tr ln nht. Khi A:in p gia hai u cun dy sm pha 2t so vi in p gia hai bn t. B: Cng sut tiu th trn mch l ln nht. C:Trong mch c cng hng in. D:in p gia hai u mch chm pha 2t so vi in p gia hai u cun dy. Cu 27: Cho phn ng ht nhn 3 2 4 11 1 2 017, 6 H H He n MeV + + + . Nng lng ta ra khi tng hp c 1 g kh heli xp x bng A: 4,24.108J.B: 4,24.105J.C: 5,03.1011J.D: 4,24.1011J. Cu 28: Gii hn quang in ca mi kim loi l A: Cng nh nht dng bt khi electron ra khi b mt kim loi B: Bc sng di nht ca bc x chiu vo kim loi m gy ra c hin tng quang in . C: Cng ln nht dng bt khi electron ra khi b mt kim loi D: Bc sng ngn nht ca bc x chiu vo kim loi m gy ra c hin tng quang in Cu 29: BcsngdinhttrongdyLaiman;Banme;Pasenlnltl0,122m;0,656m;1,875m.Bcsngdithhaicady Laiman v Banme l A: 0,103m v 0,486B: 0,103m v 0,472mC: 0,112m v 0,486mD: 0,112m v 0,472m Cu 30: Mt con lc n c chiu di l=1m dao ng nh ti ni c gia tc trng trng g=t2=10m/s. Nu khi vt i qua v tr cn bng dy treo vng vo inh nm cch im treo 50cm th chu k dao ng ca con lc n l: A: 2 sB: 2 22s+C: 2+ 2sD: p n khcCu 31: Mt ng h m giy s dng con lc n chy ng cao 200m, nhit 240C: Bit thanh con lc c h s n di 2.10-5K-1, bn knh Tri t 6400km. Khi a ng h ln cao 1km, nhit l 200C th mi ngy m n chy A: chm 14,256 s.B: chm 7,344 s.C: nhanh 14,256 s.D: nhanh 7,344 s. Cu 32: Mch dao ng chn sng ca mt my thu gm mt cun dy thun cm L bng 0,5mH v t in c in dung bin i c t 20pF n 500pF. My thu c th bt c tt c cc sng v tuyn in c gii sng nm trong khong no ? A: 188,4m n 942mB: 18,85m n 188mC: 600m n 1680mD: 100m n 500m Cu 33: MtsngchclantruyndctheomtngthngvibinsngkhngicphngtrnhsngtingunOl:u= A:cos(et - t/2) (cm). Mt im M cch ngun O bng 1/6 bc sng, thi im t = 0,5t/e c ly 3(cm). Bin sng A lA: 2 cm B: 2 3(cm) C: 4 (cm)D:3(cm) Cu 34: Hai khe Ing cch nhau 3mm c chiu bng nh sng n sc c bc sng 0,60m. Cc vn giao thoa c hng trn mn cch hai khe 2m. Ti im M cch vn trung tm 1,2 mm c: A: vn sng bc 2.B: vn sng bc 3.C: vn ti th 2.D: vn ti th 3. Cu 35: Mt on mch in xoay chiu gm mt t in c dung khng ZC = 200 v mt cun dy mc ni tip. Khi t vo hai u on mch trn mt in p xoay chiu lun c biu thc u = 120 2 cos(100t + 3t)V th thy in p gia hai u cun dy c gi tr hiu dng l 120 v sm pha 2tso vi in p t vo mch. Cng sut tiu th ca cun dy l A: 72 W.B: 240W.C: 120W.D: 144W Cu 36: Chn cu sai khi ni v ng c khng ng b ba pha A: T trng quay c to ra bi dng in xoay chiu ba pha B: Stato c ba cun dy ging nhau qun trn ba li st b tr lch nhau 1/3 vng trn. C: T trng tng hp quay vi tc gc lun nh hn tn s gc ca dng in. D: Nguyn tc hot ng da trn hin tng cm ng in t v s dng t trng quay. Cu 37: Nng lng cn thit phn chia ht nhn 126C thnh 3 ht ( cho mc=11,9967u; m4,0015u) A:7,266MeV. B: 5,598MeV. C: 8,191MeV. D: 6,025MeV. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 17 Cu 38: Cho mt ngun sng trng i qua mt bnh kh hirnung nng nhit thp hn nhit ca ngun pht ra nh sng trng ri cho qua my quang ph th trn mn nh ca my quang ph s quan st c A: 4 vch mu.B: 4 vch en.C: 12 vch mu.D: 12 vch en. Cu 39: Pht biu no sau y khng ng khi ni v sng in t A: Sng in t l sng ngang. B: Sng in t mang nng lng. C: Sng in t c th phn x, nhiu x, khc x. D: Sng in t c thnh phn in v thnh phn t bin i vung pha vi nhau. Cu 40: t vo hai u mch in cha hai trong ba phn t gm: in tr thun R, cun dy thun cm c t cm L, t in c in dung C mt hiu in th xoay chiu n nh c biu thc u = U0cos e t(V) th cng dng in qua mch c biu thc i = I0cos(e t - /4) (A). Hai phn t trong mch in trn l: A:Cun dy ni tip vi t invi ZL = 2ZC:B:Cun dy ni tip vi t in vi 2ZL = ZC: C:in tr thun ni tip vi cun dy vi R = ZL.D:in tr thun ni tip vi t in vi R = ZC: Cu 41: Con lc n c chiu di l = 98cm, khi lng vt nng lm = 90gdao ng vi bin gco0 = 60ti ni c gia tc trng trng g =9,8 m/s2.C nng dao ng iu ho ca con lc c gi tr bng: A: E = 0,09 JB: E = 1,58JC: E = 1,62 JD: E = 0,0047 J Cu 42: Mt con lc n c treo trong thang my, dao ng iu ha vi chu k T=1s khi thang my ng yn. Nu thang my i xung nhanh dn u vi gia tc g/10 ( g l gia tc ri t do) th chu k dao ng ca con lc l A: 109 sB: 1110 sC: 1011 sD: 910 s Cu 43: Mt con lc l xo dao ng iu ha th. A: gia tc lun lun hng v v tr cn bng. B: li v ng nng ca vt bin thin iu ha cng chu k. C: vn tc lun lun hng v v tr cn bng. D: lc n hi ca l xo lun hng v v tr cn bng. Cu 44: Pht biu no sau y l sai khi ni v in t trng? A: in trng xoy l in trng m ng sc l nhng ng cong h B: Khi mt t trng bin thin theo thi gian, n sinh ra mt in trng xoy. C: T trng xoy l t trng m ng cm ng t bao quanh cc ng sc in trng. D: Khi mt in trng bin thin theo thi gian, n sinh ra 1 t trng xoy Cu 45: Trong th nghim Ing v giao thoa nh sng trong khng kh, hai khe cch nhau 3mm c chiu bng nh sng n sc c bc sng 0,6m, mn quan st cch hai khe 2m. Sau t ton b th nghim vo trong nc c chit sut 4/3, khong vn quan st trn mn l A: i = 0,3m.B: i = 0,4m.C: i = 0,3mm.D: i = 0,4mm. Cu 46: Cho mt cun dy c in tr thun 40 O v c t cm 0,4/t (H). t vo hai u cun dy in p xoay chiu c biu thc: u = U0cos(100tt - t/2) (V). Khi t = 0,1 (s) dng in c gi tr -2,75 2(A). Ga tr ca U0 lA: 220 (V)B: 110 2(V)C: 220 2(V)D: 440 2(V) Cu 47: Mt bin p c hao ph bn trong xem nh khng ng k, khi cun 1 ni vi ngun xoay chiu U1 = 110V th hiup o c cun 2 l U2 = 220V. Nu ni cun 2 vi ngun U1 thin p o c cun 1 lA:110 V.B:45V.C:220 V.D:55 V . Cu 48: Ban u (t = 0) c mt mu cht phng x X nguyn cht. thi im t1 mu cht phng x X cn li 20% ht nhn cha b phn r. n thi im t2 = t1 + 100 (s) s ht nhn X cha b phn r ch cn 5% so vi s ht nhn ban u. Chu k bn r ca cht phng x l A: 50 s.B: 25 s.C: 400 s.D: 200 s. Cu 49: Chn cu tr li sai khi ni v hin tng quang in v quang dn: A: u c bc sng gii hn 0 . B: u bt c cc lectron ra khi khi cht . C: Bc sng gii hn ca hin tng quang in bn trong c th thuc vng hng ngoi. D: Nng lng cn gii phng lectron trong khi bn dn nh hn cng thot ca letron khi kim loi . Cu 50: Mt mch in gm in tr thun R, cun dy thun cm v mt t in c in dung thay i cmc ni tip. t vo hai u on mch trn mt hiu in th xoay chiu c biu thc 0cos u U t e = (V). Khi thay i in dung ca t cho hiu in th gia hai bn t t cc i v bng 2U. Ta c quan h gia ZL v R l: A:ZL = 3R.B:ZL = 2R.C:ZL =3 R.D:ZL = 3R. GIO DC HNG PHC S : 06 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 18 Cu 1:Mt con lc l xo dao ng iu ho vi bin 18cm. Ti v tr c li x = 6cm, t s gia ng nng v th nng ca con lc l: A: 8B: 6C: 3D: 0,125 Cu 2:Mt con lc l xo dao ng trong mt mi trng c lc cn nh vi chu k T, bin A, vn tc cc i vmax v c nng E. C my i lng trong cc i lng gim theo thi gian? A: 2.B: 1.C: 3. D: 4. Cu 3:Trong in t trng, cc vect cng in trng v vect cm ng t lun: A: cng phng, ngc chiu. B: c phng vung gc vi nhau. C: cng phng, cng chiu.D: c phng lch nhau gc 450. Cu 4:Trong th nghim giao thoa sng trn mt nc, hai ngun AB cch nhau 14,5cm dao ng ngc pha im M trn AB gn trung im I ca AB nht, cch I l 0,5cm lun dao ng cc i. S im dao ng cc i trn ng elp thuc mt nc nhn A, B lm tiu im l A: 18 imB: 30 imC: 28 imD: 14 im Cu 5:Chn pht biu ng trong cc pht biu sau: A:Quang ph ca mt Tri ta thu c trn tri t l quang ph vch hp th. B: Mi vt khi nung nng u pht ra tia t ngoi. C:Quang ph ca mt Tri ta thu c trn tri t l quang ph vch pht x. D: Quang ph ca mt Tri ta thu c trn tri t l quang ph lin tc Cu 6:Mt thit b in c t di hiu in th xoay chiu tn s 100 Hz c gi tr hiu dng 220 V. Thit b ch hot ng khi hiu in th tc thi c gi tr khng nh hn 220 V. Thi gian thit b hot ng trong na chu k ca dng in l A: 0,004 sB: 0,0025 sC: 0,005 sD: 0,0075 s Cu 7:Mt khung dy quay u trong t trngB vung gc vi trc quay ca khung vi tc n = 1800 vng/ pht. Ti thi im t = 0, vct php tuynn ca mt phng khung dy hp viB mt gc 300. T thng cc i gi qua khung dy l 0,01WB. Biu thc ca sut in ng cm ng xut hin trong khung l : A:0, 6 cos(30 )6e t Wbtt t = .B: e = 0,6 cos( 60t - 3 ) WB. C:0, 6 cos(60 )6e t Wbtt t = + .D:60 cos(30 )3e t Wbt= + . Cu 8:Tnh nng lng to ra trong phn ng nhit hch:3Li6 + 1H2 2He4 + 2He4. Cho bit khi lng ca nguyn t3Li6 = 6,01703 u, ca nguyn t 1H2 = 2,01400 u; ca nguyn t 2He4 = 4,00260 u; 1u = 1,66043.10-27kg; c = 2,9979.108 m/s;1J = 6,2418.1018 eV. A: 18,5 MeVB: 19,6 MeVC: 20,4 MeVD: 22,3 MeV Cu 9:Chn pht biu sai khi ni v in t trng: A: Khi mt t trng bin thin theo thi gian, n sinh ra mt in trng xoy B: in trng xoy l in trng m ng sc l nhng ng cong C: Khi mt in trng bin thin theo thi gian, n sinh ra mt t trng xoy D: T trng xoy l t trng m ng cm ng t bao quanh cc ng sc in trng Cu 10: H thng pht thanh gm: A: ng ni, dao ng cao tn, bin iu, khuch i cao tn, ngten pht. B: ng ni, dao ng cao tn, tch sng, khuch i m tn, ngten pht. C: ng ni, dao ng cao tn, chn sng, khuch i cao tn, ngten pht D: ng ni, chn sng, tch sng, khuch i m tn, ngten pht. Cu 11: Mtcon lcn dao ng iu havivibin gco0=90v nng lng E=0,02 J.ngnngcacon lckhi li gc o =4,50 l: A: 0,015 J. B: 0,225 J.C: 0,198 J. D: 0,027 J Cu 12: Mt con lc n c treo trn mt thang my. Khi thang my i xung nhanh dn u v sau chm dn u vi cng mt gia tc th chu k dao ng iu ha ca con lc ln lt l T1=2,17 s v T2=1,86 s. ly g= 9,8m/s2. Chu k dao ng ca con lc lc thang my ng yn v gia tc ca thang my l: A: 1 s v 2,5 m/s2.B: 1,5s v 2m/s2. C: 2s v 1,5 m/s2. D: 2,5 s v 1,5 m/s2.Cu 13: Mch dao ng ca mt my thu v tuyn in gm cun dy c t cm L= 0,5mH v mt t in c in dung thay i c my thu bt c sng v tuyn c tn s t 2MHz n 4MHz th in dung ca t phi thay i trong khong:A: 3,17 pF s C s12,67 pF. B: 3,17 pF s C s 16,28 pF. C: 9,95 pF s C s 39,79pF. D: 1,37 pF s C s 12,67 pF.Cu 14: Trong th nghim ca Young, khong cch gia hai khe S1S2 n mn l 2m. Ngun S pht ra nh sng n sc t cch u hai khe mt khong 0,5m. Nu di S theo phng song song vi S1S2 mt on 1mm th vn sng trung tm s dch chuyn mt on l bao nhiu trn mn ? A: 4mm. B: 5mm. C: 2mm. D: 3mm.Cu 15: Trong cch mc dng in xoay chiu ba pha i xng theo hnh tam gic . Pht biu no sau y l khng ng ? A: Dng in trong mi pha bng dng in trong mi dy pha B:Hiu in th gia hai u mt pha bng hiu in th gia hai pha C:Cng sut tiu th trn mi pha u bng nhau. D:Cng sut ca ba pha bng ba ln cng sut mi pha Cu 16: Mt mch in xoay chiu gm mt cun dy v mt t in c in dung thay i c mc ni tip. t vo hai u mch in ny mt in p xoay chiu c tn s v in p hiu dng khng i, iu chnh in dung ca t sao cho in p hiu dng gia hai bn t c gi tr ln nht. Khi TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 19 A:in p gia hai u cun dy sm pha 2t so vi in p gia hai bn t. B:cng sut tiu th trn mch l ln nht. C:trong mch c cng hng in. D:in p gia hai u mch chm pha 2t so vi in p gia hai u cun dy. Cu 17: Mt con lc l xo cch v tr cn bng 4 cm th c tc bng khng v l xo khng bin dng. Cho g = 9,8 m/s2. Tr s ng ca tc ti v tr cn bng l ( ly ti ba ch s c ngha) A:0,626 m/s. B: 6,26 cm/s.C: 6,26 m/s. D: 0,633 m/s. Cu 18: Quang ph ca mt bng n dy tc khi nng sng th s A: Sng dn khi nhit tng dn nhng vn c by mu B: Ccmu xut hin dn t mu n tm, khng sng hn C: Va sng dn ln, va xut hin dn cc mu n mt nhit no mi 7 mu D: Hon ton khng thay i Cu 19: Mch RLC mc ni tip c R = 100 ( O ); L = 1 / t(H); C = 4102t (F). t vohai u u on mch mt hiu in th xoay chiu uAB = 1202 sin (e t) (V), trong tn s gcethay i c cng sut tiu th in ca on mch cc i th tn s gcenhn gi tr A:100t (rad/s) .B: 1002 (rad/s) .C: 120t (rad/s) . D: 1002t (rad/s)Cu 20: Trong mt my pht in xoay chiu 3 pha, khi sut in ng mt pha t gi tr cc i e1 =E0 th cc sut in ng cc pha kia t cc gi tr A: 020322EeEe= = B: 02033232EeEe= = C: 020322EeEe= =D: 020322EeEe== Cu 21: Chn cu pht biu ng A: Sng in t c bn cht l in trng lan truyn trong khng gian B: Sng in t c bn cht l t trng lan truyn trong khng gian C: Sng in t lan truyn trong tt c cc mi trng k c trong chn khng D: Mi trng c tnh n hi cng cao th tc lan truyn ca sng in t cng ln Cu 22: Khi lng ht nhndoteri (21 D) l m = 1875,67 MeVc2 , proton l m p = 938,28MeVc2 , V notron l m n = 939,57 MeVc2 . Nng lng lin kt ca ht nhn doteri teri l: A: W lk = 1,58MeVB: W lk = 2,18MeVC: W lk = 2,64MeVD: W lk = 3,25MeVCu 23: C cc loi tng tc c bn i vi cc ht s cp l: A: Tng tc hp dn, tng tc ma st, tng tc in t, tng tc n hi, B: Tng tc hp dn, tng tc ma st, tng tc in t, tng tc Culong C: Tng tc in t, tng tc hp dn, tng tc manh, tng tc yu D: Tng tc in t, tng tc n hi, tng tc mnh, tng tc yu Cu 24: Pht biu no sau y l sai khi ni v sng v tuyn? A: Sng trung c th truyn xa trn mt t vo ban m. B: Sng di thng dng trong thng tin di nc C: Sng ngn c th dng trong thng tin v tr v truyn i rt xa D: Sng cc ngn phi cn cc trm trung chuyn trn mt t hay v tinh c th truyn i xa trn mt t. Cu 25: Trong mch chn sng ca mt my thu v tuyn in, b cun cm c t cm thay i t 1mH n 25mH. mch ch bt c cc sng in t c bc sng t 120m n 1200m th b t in phi c in dng bin i t: A: 4pF n 16pF.B: 4pF n 400pF.C: 16pF n 160nF.D: 400pF n 160nF. Cu 26: Mt con lc l xo dao ng theo phng nm ngang vi phng trnh x= 4 cos10t t ( cm, s). Vt nng c khi lng m= 100g. Ly 2t = 10. Lc n hi cc i tc dng vo vt l: A: 2,5 N. B: 1,6 N.C: 4 N. D: 8 N. Cu 27: Mt dao ng l tng hp ca hai dao ng iu ha cng phng vi cc phng trnh l x1= 12cos2t t (cm;s) v x2= 12cos(2t t - t /3) (cm;s). Vn tc cc i ca vt l A: 4,16 m/s B: 1,31 m/s C: 0,61 m/sD: 0,21 m/s Cu 28: Li , vn tc, gia tc ca dao ng iu ha ph thuc thi gian theo quy lut ca mt hm sin c A: cng phaB: cng bin .C: cng pha ban u.D: cng tn s. Cu 29: Trong dao ng iu haA:Khi gia tc cc i th ng nng cc tiu. B:Khi lc ko v cc tiu th th nng cc i. C:Khi ng nng cc i th th nng cng cc i. D:Khi vn tc cc i th pha dao ng cng cc i. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 20 Cu 30: Mch chn sng ca mt my thu thanh gm cun dy c t cm L = 2.10-6H, in tr thun R = 0. my thu thanh ch c th thu c cc sng in t c bc sng t 57m n 753m, ngi ta mc t in trong mch trn bng mt t in c in dung bin thin. Hi t in ny phi c in dung trong khong no? A: 3,91.10-10F C 60,3.10-10FB: 2,05.10-7F C 14,36.10-7F C: 0,12.10-8F C 26,4.10-8F D: 0,45.10-9F C 79,7.10-9F Cu 31: Mch in xoay chiu gm in tr thun R =30( O )mc ni tip vi cun dy. t vo hai u mch mt hiu in th xoay chiu u = U2 sin(100t t)(V).Hiu in th hiu dng hai u cun dy l Ud = 60 V. Dng in trong mch lch phat /6 so vi u v lch phat /3 so vi uD: Hiu in th hiu dng hai u mch ( U ) c gi trA: 603 (V). B: 120 (V). C: 90 (V). D: 602(V). Cu 32: Bit sAvgar NA = 6,02.1023 ht/molv khi lng ca htnhn bng s khi ca n. S prtn (prton) c trong 0,27 gam 2713All A: 7,826.1022.B: 9,826.1022.C: 8,826.1022.D: 6,826.1022. Cu 33: Mt ngun m xem nh 1 ngun im , pht m trong mi trng ng hng v khng hp th m .Ngng nghe ca m l I0 =10-12 W/m2.Ti 1 im Ata o c mc cng m l L = 70dB.Cng m I ti A c gi tr l A: 70W/m2B: 10-7 W/m2C: 107 W/m2D: 10-5 W/m2 Cu 34: Sng in t c tn s f = 2,5MHz truyn trong thu tinh c chit sut n=1.5 th c bc sng l A: 50mB: 80mC: 40mD: 70m Cu 35: Ti hai im A v B kh gn nhau trn mt cht lng c hai ngun pht sng theo phng thng ng vi cc phng trnh ln lt l u1 = acos(et) cm v u2= acos(et) cm. im M trn mt cht lng cch A v B nhng on tng ng l d1, d2 s dao ng vi bin cc i, nu:A: d2 - d1 = (k + 1/2) ( k e Z). B: d2 - d1 = k /2 ( k Z ).C: d2 - d1 = k (keZ).D: d2 - d1 = (2k + 1) ( k Z).Cu 36: Hai ngun kt hp S1, S2 cch nhau 16cm c chu k 0,4s v cng pha Tc truyn sng trong mi trng khng i l 20cm/s. S cc tiu giao thoa trong on S1S2 l:A: 2. B: 4. C: 7. D: 5.Cu 37: Khi i vo mt ng hp, ta nghe ting bc chn vng li l do hin tng A: Khc x sngB: Phn x sngC: Nhiu x sngD: giao thoa sng Cu 38: Pht biu no sau y ng khi ni v tia t ngoi ? A:Tia t ngoi l mt bc x m mt thng c th nhn thy. B:Tia t ngoi l mt trong nhng bc x do cc vt c t khi ln pht raC: Tia t ngoi l bc x khng nhn thy c bc sng nh hn bc sng ca nh sng tmD:Tia t ngoi l bc x khng nhn thy c bc sng ln hn bc sng ca nh sng Cu 39: Dng in xoay chiu i=2cos(110tt) A mi giy i chiu A: 100 lnB: 120 lnC: 99 lnD: 110 ln Cu 40: Chn cu sai trong cc cu sauMch in xoay chiu RLC ni tip ang xy ra cng hng. Nu thay i tn s ca in p t vo hai u mch thA: in p hiu dng trn L tng.B: Cng sut trung bnh trn mch gim. C: Cng hiu dng qua mch gim.D: H s cng sut ca mch gim. Cu 41: Mt n in c ghi 110 V- 100 W mc ni tip vi mt in tr R vo mt mch in xoay chiu c U = 2202 cos(100t t) (V). n sng bnh thng, in tr R phi c gi tr A: 121O .B: 1210O . C: 110O . D:10011O . Cu 42: Mt mch in gm cc phn t in tr thun R, cun thun cm L v t in C mc ni tip. t vo mch in mt hiu in th xoay chiu n nh. Hiu in th hiu dng trn mi phn t u bng nhau v bng200V. Nu lm ngn mch t in (ni tt hai bn cc ca n) th hiu in th hiu dng trn in tr thun R s bng A:1002 V. B: 200 V. C: 2002 V.D: 100 V. Cu 43: Chn cu ng. Chu k bn r ca Ra226 l 1600nm. Nu nhn c 10g Ra226 th sau 6 thng khi lng cn li l: A.9,9978g. B: 9,8612g.C: 9,9998g.D: 9,8819g. Cu 44: Phtpho c chu k bn r l 14ngy. Ban u c 300g cht pht pho sau 70 Ngy m, lng pht pho cn li: A:7.968g. B: 7,933g.C: 8,654g.D: 9,375g. Cu 45: Tnh nng lng to ra trong phn ng nhit hch:1H2 + 2He3 1H1 + 2H4. Cho bit khi lng ca nguyn t 1H2 = 2,01400 u, ca nguyn t 2He3 = 3,016303 u; ca nguyn t 1H1 = 1,007825 u; ca nguyn t 2H4 = 4,00260u; 1u = 1,66043.10-27kg; c = 2,9979.108 m/s; 1J = 6,2418.1018 eV. A: 18,3 MeVB: 19,5 MeVC: 19,8 MeVD: 20,2 MeV Cu 46:Tm pht biu sai v Mt Trng A.Mt Trng cch tri t 384 000km, v c bn knh l 1738 km B.Kh quyn trn mt trng ch yu l Hidro v H li C.Mt trng quay quanh Tri t vi chu k 27,32 ngy v lun hng v mt mt xc nh v pha tri t D.Chuyn ng ca mt tri gy ra thy triu cc i dng v nh hng n c n kh quyn Tri t Cu 47: Mch dao ng bt tn hiu ca mt my thu v tuyn in gm mt cun cm L = 2(H) v mt t in 01800 C = (pF). N c th thu c sng v tuyn in vi bc sng l: TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 21 A: 113(m)B: 11,3(m)C: 13,1(m)D: 6,28(m) Cu 48: Cho mt sng in t c tn s f = 3MHz. Sng in t ny thuc di A: Sng cc ngnB: Sng diC: Sng ngnD: sng trung Cu 49: Trong cc loi sng v tuyn th A: sng di truyn tt trong ncB: sng ngn b tng in li hp th C: sng trung truyn tt vo ban ngyD: sng cc ngn phn x tng in li Cu 50: Trong th nghim Ing: Hai khe cch nhau 2mm, 2 khe cch mn 4m, bc sng dng trong th nghim l 0,6m th ti v tr M trn mn cch vn trung tm mt on 7,8mm l vn g? bc my? A: Vn ti, th 6.B: Vn sng, bc 6C: Vn ti th 8D:Vn ti th 7. GIO DC HNG PHC S : 07 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1:Mt vt dao ng iu ha vi bin A v tn s f. Thi gian ngn nht vt i c qung ng c di A l A: 16 f. B: 14 f.C: 13 f.D: 4f. Cu 2:Con lc l xo gm mt hn bi c khi lng 400 gv mt l xo c cng 80 N/m. Hn bi dao ng iu ha trn qu o l mt on thng di 10 cm. tc ca hn bi khi qua v tr cn bng l A:1,41 m/s. B: 2,00 m/s. C: 0,25 m/s.D: 0,71 m/s. Cu 3:Mt vt dao ng iu ha trn trc Ox, xung quanh v tr cn bng l gc ta . Gia tc ca vt ph thuc vo li x theo phng trnh: a = - 400t2x. s dao ng ton phn vt thc hin c trong mi giy l A.20. B: 10.C: 40. D: 5. Cu 4:Mt con lc n treo vo mt thang my thng ng, khi thang my ng yn th con lc dao ng vi chu k 1s, khi thang my chuyn ng th con lc dao ng vi chu k 0,96s. Thang my chuyn ng: A: Nhanh dn u i ln B: Nhanh dn u i xungC: Chm dn u i lnD: Thng u Cu 5:Chu k dao ng nh ca con lc n ph thuc vo yu t no sau y? A: Bin dao ng ca con lcB: Khi lng ca con lc C: V tr dao ng ca con lc .D: iu kin kch thch ban u. Cu 6:Trong dao ng iu ho, pht biu no sau y l khng ng? A: C sau mt khong thi gian T(chu k) th vt li tr v v tr ban u. B: C sau mt khong thi gian T th vn tc ca vt li tr v gi tr ban u. C: C sau mt khong thi gian T th gia tc ca vt li tr v gi tr ban u. D: C sau mt khong thi gian T th bin vt li tr v gi trban u. Cu 7:Mt vt dao ng iu ho vi bin A = 4cmv chu k T = 2s, chn gc thi gian l lc vt i qua VTCB theo chiu dng. Phng trnh dao ng ca vt l A: x = 4cos(2tt - 2t)cm.B: x = 4cos(tt - 2t)cm.C: x = 4cos(2tt + 2t)cm.D: x = 4cos(tt + 2t)cm. Cu 8:Mt con lc l xo gm vt c khi lng m = 200g, l xo c khi lng khng ng k, cng k= 80N/m; t trn mt sn nm ngang. Ngi ta ko vt ra khi v tr cn bng on 3cm v truyn cho n vn tc 80cm/s. Cho g = 10m/s2. Do c lc ma st nn vt dao ng tt dn, sau khi thc hin c 10 dao ng vt dng li. H s ma st gia vt v sn l A: 0,04.B: 0,15.C: 0,10.D: 0,05 . Cu 9:Mt con lc n c chiu di l, dao ng iu ho ti mt ni c gia tc ri t do g, vi bin gc 0. Khi vt i qua v tr c ly gc , n c vn tc l v . Khi , ta c biu thc: A:v2 gl= 02 - 2 .B: 2 = 20o- glv2.C: 20o= 2 + 22ve.D: 2 = 20o- 2vgl. Cu 10: Cho mch dao ng gm mt cun cm mc ni tip vi mt t in C1 th mch thu c sng in t c bc sng 1, thay t trn bng t C2 th mch thu c sng in t c 2. Nu mc ng thi hai t ni tip vi nhau ri mc vo cun cm th mch thu c sng c bc sng xc nh bng cng thc A: 2 2 21 2 = + B: 2 21 2 = + C: 1 2 = D:( )1 212 = +Cu 11: Hin tng cng hng trong mch LC xy ra cng r nt khi A: tn s ring ca mch cng ln.B: cun dy c t cm cng ln. C: in tr thun ca mch cng ln.D: in tr thun ca mch cng nh. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 22 Cu 12: Mch dao ng ca mt my thu v tuyn gm cun cm L = 5 H v t xoay c in dng bin thin tC1 = 10 pF n C2 = 250 pF. Di sng in t m my thu c c bc sng l A: 11 m75 m.B: 13,3 m92,5 m.C: 13,3 m66,5 m.D: 15,5 m41,5 m. Cu 13: Mt sng in t c bc sng 420 nm i t chn khng vo thy tinh c chit sut vi sng in t ny bng 1,5. Bc sng ca nh sng ny trong thy tinh bng A: 280 nm.B: 420 nm.C: 210 nm.D: 630 nm. Cu 14: iu no sau y l ng khi ni v sng in t ? A: Sng in t l sng c phng dao ng lun l phng ngang B: in t trng lan truyn trong khng gian di dng sng in t C: Sng in t khng lan truyn c trong chn khng D: Sng in t l sng c phng dao ng lun l phng thng ng Cu 15: u O ca mt si dy n hi nm ngang dao ng iu ho vi bin 3cm vi tn s2Hz. Sau 2s sng truyn c 2m. Chn gc thi gian lc u O i qua v tr cn bng theo chiu dng. Li ca im M trn dy cch O on 2,5m ti thi im 2s l: A: xM = -3cm.B: xM = 0C: xM = 1,5cm.D: xM = 3cm. Cu 16: Mt sng c hc c bin A, bc sng . Vn tc dao ng cc i ca phn t mi trng bng 3 ln tc truyn sng khi: A: = 2A/3.B: = 3A/4.C: = 2AD: = 3A/2. Cu 17: Ti 2 im O1 , O2 cch nhau 48 cm trn mt cht lng c 2 ngun pht sng dao ng theo phng thng ng vi phng trnh: u1 = 5cos( 100t t) (mm) ; u2 = 5cos(100t t +t /2) (mm). Vn tc truyn sng trn mt cht lng l 2 m/s. Coi bin sng khng i trong qu trnh truyn sng. S im trn on O1O2 dao ng vi bin cc i ( khng k O1;O2) l A: 23.B: 24. C:25.D: 26. Cu 18: Khi c sng dng trn si dy n hi, 2 phn t vt cht ti 2 im bng gn nhau nht s dao ng:A: Ngc phaB: Cng phaC: Lch phaD: Vung pha Cu 19: Khi cng m tng 1000 ln th mc cng m tng A: 100(dB)B: 20(dB)C: 30(dB)D: 40(dB) Cu 20: Mt nh sng n sc c bc sng = 0,6670m trong nc c chit sut n = 4/3. Tnh bc sng ' ca nh sng trong thy tinh c chit sut n = 1,6. A: 0,5883mB: 0,5558mC: 0,5833mD: 0,8893m Cu 21: Trong th nghim giao thoa nh sng. Hai khe Ing cch nhau 2 mm, hnh nh giao thoa c hng trn mn nh cch hai khe 2m. S dng nh sng trng c bc sng t 0,40 m n 0,75 m. Trn mn quan st thu c cc di quang ph. B rng ca di quang ph ngay st vch sng trng trung tm l A: 0,45 mmB: 0,55 mmC: 0,50 mmD: 0,35 mm Cu 22: Pht biu no sau y v tia t ngoi l khng ng? A:c th dng cha bnh ung th nng. B:tc dng ln knh nh. C:c tc dng sinh hc: dit khun, hy dit t bo. D: c kh nng lm ion ha khng kh v lm pht quang mt s cht. Cu 23: Trong th nghim Ing ( Young) v giao thoa nh sng, khong vn sA:gim i khi tng khong cch gia hai khe. B:tng ln khi gim khong cch gia hai khe v mn quan st. C: tng ln khi tng khong cch gia hai khe. D: khng thay i khi thay i khong cch gia hai khe v mn quan st. Cu 24: Pht biu no sau y v tia hng ngoi l khng ng? A:Tia hng ngoi do cc vt nung nng pht ra B:Tia hng ngoi lm pht quang mt s cht kh. C:Tc dng ni bt nht ca tia hng ngoi l tc dng nhit. D:Tia hng ngoi c tn s nh hn 4. 1014 Hz. Cu 25: Chiu chm nh sng trng hp vo nh ca mt lng knh theo phng vung gc vi mt phng phn gic ca gc chit quang. Bit gc chit quang 40, chit sut ca lng knh i vi nh sng v tm ln lt l 1,468 v 1,868. B rng quang ph thu c trn mn quan st t song song vi mt phng phn gic v cch mt phng phn gic 2m l A: p n khcB: 6,4cmC: 6cmD: 6,4m Cu 26: Chn cu tr li ng.Khi lng ca ht nhn 104Bel 10,0113(u), khi lng ca ntron l mn=1,0086u, khi lng ca prtn l : mp=1,0072u. ht khi ca ht nhn104Bel:A: 0,9110u.B: 0,0691u.C: 0,0561u.D: 0,0811u Cu 27: Chn cu ng i vi ht nhn nguyn t A Khi lng ht nhn xem nh khi lng nguyn tB:Bn knh ht nhn xem nh bn knhnguyn t C:Ht nhn nguyn t gm cc ht proton v electronD: Lc tnh in lin kt cc nucleon trong nhn nguyn t Cu 28: Rn 222c chu k bn r l 3,8 ngay. S nguyn t cn li ca 2g cht sau 19 ngy: A:220,3.1018. B: 169,4.1018. C: 180,8.1018. D: 625,6.1018. Cu 29: Vo lc t=0, ngi ta m c 360 ht phng ra ( t mt cht phng x)trong mt pht. Sau 2 gi m c 90 ht trong mt pht. Chu k bn r ca cht phng x : A: 45pht.B: 60pht.C: 20pht. D: 30pht. TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 23 CLA NR BMCu 30: C 2 cht phng x A v B vi hng s phng x A v B . S ht nhn ban u trong 2 chtl NA vNB . Thi gian s ht nhn A & B ca hai cht cn li bng nhau lA:lnA B AA B BNN B: 1lnBA B ANN +C: 1lnBB A ANN D:lnA B AA B BNN +

Cu 31: Mot chat phong xacokhoi l ng M0,chu k ban raT. Sau thi gi an T=4T, th khoi lng bphan ral a: A: m o32 B: m o16 C: 15m o16 D: 31m o16

Cu 32: Ht s cp khng c c trng no di y A: Khi lng ngh hay nng lng nghB: in tch hay s lng in tch Q C: Momen ng lng ring v momen tD: Vn tc hoc ng lng Cu 33: Tm pht biu sai v tng tc in t trong cc ht nhn A: Tng tc t xy ra gia cc ht mang in B: Tng tc in t gia cc vt tip xc gy nn ma st C: Bn knh gy ln tng tc in t l rt ln D: Tng tc in t mnh hn tng tc hp dn vi ba ln Cu 34: Gii hn quang in ca kim loi dng lm catot ca t bo quang in l 0,662m. Cng thot tnh theo n v J v eV c gi tr: A: 3.10-20J=1,875eVB: 3.10-18J=1,875eVC: 3.10-18J=18,75eVD: 3.10-19J=1,875eV Cu 35: Gii hn quang in ca nhm v kali ln lt l 0,36 m v 0,55 m. Ln lt chiu vo bn nhm v bn kali chm sng n sc c tn s 7.1014Hz. Hin tng quang in A: Ch xy ra vi kim loi nhm.B: Ch xy ra vi kim loi kali. C: Xy ra vi c kim loi nhm v kali.D: Khng xy ra vi kim loi no. Cu 36: Mu nguyn t Bo khc mu nguyn t R-d-pho im no di y? A: Trng thi c nng lng n nh B: Hnh dng qu o ca cc electron C: M hnh nguyn t c ht nhn D: Lc tng tc gia electron v ht nhn nguyn t Cu 37: Chiu nh sng t ngoi vo b mt catt ca 1 t bo quang in sao cho c electron bt ra khi catt . ng nng ban u cc i ca elctrron bt khi catot tng ln bin php no l khng th? A: Tng cng ca chm sng ang dngB: Dng nh sng c bc sng nh hn. D: Dng nh sng c tn s ln hn.C: Dng tia X. Cu 38: Chm bc x chiu vo catt ca tbo quang inc cng sut 0,2 W , bc sng0, 4 m = .Hiu sut lng t ca t bo quang in ( t s gia s phtn p vo catt vi s electron thot khi catt) l 5%.Tm cng dng quang in bo ha . A: 0,2 mAB: 0,3 mAC: 6 mAD: 3,2 mA. Cu 39: bc sng ngn nht tia X pht ra l 0,05nm hiu in th hot ng ca ng Culitgi t nht phi l A: 21.897KVB: 24.843KVC: 10.549KVD: 30.759KV Cu 40: Cho on mch nh hnh v. Khi t vo hai u mch mt in p c biu thc u = 120 2 cos100t t(V) th thy in p gia hai u on NB v in p gia u on AN v c cng mt gi tr hiu dng v trong mch ang c cng hng in. in p hiu dng gia hai u in tr R l A:30 2 V.B:60 2 V.C:30V.D:60VCu 41: Mt bin th c hao ph bn trong xem nh khng ng k, khi cun 1 ni vi ngun xoay chiu U1 = 110V th hiu in th o c cun 2 l U2 = 220V. Nu ni cun 2 vi ngun U1 th hiu in th o c cun 1 lA:110 V.B:45V.C:220 V.D:55 V . Cu 42: Pht biu no sau y l sai khi ni v my pht in xoay chiu 3 pha A:Stato l phn ng gm 3 cun dy ging nhau t lch nhau 1200 trn vng trn. B:Hai u mi cun dy ca phn ng l mt pha in. C:Roto l phn to ra t trng, stato l phn to ra dng in. D:Roto l phn to ra dng in, stato l phn to ra t trng. Cu 43: t vo hai u mch in xoay chiu gm mt cun dy v mt t in mc ni tip mt in p xoay chiu n nh c biu thc u =100 6 cos(100 )( ).4t Vtt +Dng vn k c in tr rt ln ln lt o in p gia hai u cun cm v hai bn t in th thy chng c gi tr ln lt l 100V v 200V. Biu thc in p gia hai u cun dy l: A: 100 2 cos(100 )( )2du t Vtt = + .B: 200 cos(100 )( )4du t Vtt = + . C:3200 2 cos(100 )( )4du t Vtt = + .D:3100 2 cos(100 )( )4du t Vtt = + . Cu 44: Tn s quay ca roto lun bng tn s dng in trong: A:my pht in xoay chiu 3 phaB:ng c khng ng b 3 pha C:my pht in mt chiu.D:my pht in xoay chiu mt pha TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 24 Cu 45: Mt mch in gm in tr thun R, cun dy thun cm v mt t in c in dung thay i cmc ni tip. t vo hai u on mch trn mt hiu in th xoay chiu c biu thc 0cos u U t e = (V). Khi thay i in dung ca t cho hiu in th gia hai bn t t cc i v bng 2U. Ta c quan h gia ZL v R l: A:ZL = 3R.B:ZL = 2R.C:ZL =3 R.D:ZL = 3R. Cu 46: Trong mch in xoay chiu, hiu in th gia hai u on mch v cng dng in trong mch ln lt l u = 100 sin 100t t (V) v i = 6 sin(100t t +t /3)(A) . Cng sut tiu th trong mch l A. 600 W. B: 300W. C: 150 W.D: 75 W.Cu 47: t vo hai u n mch chc mt phn tmt inp xoaychiu u = U0cos( )6tte (V) th dng in trong mch l i= I0cos(2)3tte (A). Phn t l : A: in tr thun.B: cun dy c in tr thun. C: cun dy thun cm.D: t in. Cu 48: Mt on mch mc vo in p xoay chiu u = 100cos100t(V) th cng qua on mch l i = 2cos(100t + /3)(A). Cng sut tiu th trong on mch ny l A: P = 50 W.B: P = 50 3W.C: P = 100 3W.D: P = 100 W. Cu 49: Trong mt on mch xoay chiu c cc phn t R, L, C mc ni tip. Cng dng in chy qua on mch sm pha so vi in p hai u on mch. Khng nh no sau di y lun ng: A: on mch c cc phn t R,L,CB: on mch ch c cun cm thun L. C: on mch c R vL.D: on mch c R v C Cu 50: Mch xoay chiu RLC1 mc ni tip. Bit tn s dng in l 50 Hz, R = 40 ( O), L = 1( )5Ht, C1 = 310( )5Ft. Mun dng in trong mch cc i th phi ghp thm vi t in C1 mt t in c in dung C2 tho mn A: Ghp song song v C2 = 43.10 ( ) FtB: Ghp ni tip v C2 = 45.10 ( ) Ft C: Ghp song song v C2 = 45.10 ( ) FtD: Ghp ni tip vC2 = 43.10 ( ) Ft GIO DC HNG PHC S : 08 H v tn hc sinh:.................................................................... S bo danh................................................................................. THI TH I HC 2012 Mn: VT L; KHI A Thi gian lm bi: 90 pht, khng k thi gian pht Cho bit: hng s Plng h = 6,625.10-34 J.s; ln in tch nguyn t e = 1,6.10-19 C; tc nh sng trong chn khng c = 3.108 m/s; 1u = 931,5 MeV/c2. Cu 1:Mt h gm 2 l xo L1, L2 c cng k1 = 60N/m,k2 = 40N/m mt ugnc nh, u cn li gn vo vt m cth dao ngiu ho theo phng ngang nh hnh v. Khi trngthi cn bng l xo L1 b nn 2cm. Lc n hi tc dng vo m khi vt c li 1cm l A: 1,0N .B:2,2N.C: 0,6N.D: 3,4N. Cu 2:Pht biu no sau y l sai khi ni v tng tc mnh A: L tng tc gia cc nuclon vi nhau to nn lc ht nhn B: L tng tc dn n s hnh thnh ht hadron trong qu trnh va chm ca cc hadron C: L tng tc gia cc hadron, gia cc quac D: L tng tc c bn knh tc dng c 10-10 m Cu 3:Gi o v | ln lt l hai bc sng ng vi cc vch Ho v vch lam H| ca dy Ban-me , 1 l bc sng di nht ca dy Pa-sen trong quang ph ca Hir. Biu thc lin h gia o, |, 1 l A: 1 = o - |.B: 1.o | = + C: 11 1 1.| o = D: 11 1 1.| o = +Cu 4:Quang ph vch c pht ra khi no A: Khi nung nng mt cht lng hoc kh.B: Khi nung nng mt cht kh p sut thp. C: Khi nung nng mt cht kh iu kin tiu chunD: Khi nung nng mt cht rn, lng hoc kh. x L2 L1 m TUYN TP 60 THI TH I HC 2012Ex: Nguyn Hng Khnh _ HK Pleiku TP 1: 30 C BN DNH CHO HC SINH BT U LM Mobile: 09166.01248 Email: Khanhcaphe@gmail.com Gio Dc Hng Phc - Ni Khi u c M! Trang 25 Cu 5:Cho mch in xoay chiu RLC vil bin tr. . C = 318F ;. Hiu in th hai u on mch AB : uAB = 100 2 cos 100 tt (V). Gi R0 l gi tr ca bin tr cng sut cc i. Gi R1, R2 l 2 gi tr khc nhau ca bin tr sao cho cng sut ca mch l nh nhau. Mi lin h gia hai i lng ny l: A: 21 2 0. RR R = B: 1 2 0. RR R = C: 1 2 0. RR R = D: 21 2 0. 2 RR R =Cu 6:t vo hai u mt cun dy c t cm L = 0, 4tH mt hiu in th mt chiu U1 = 12 V th cng dng in qua cun dy l I1 = 0,4 ANu t vo hai u cun dy ny mt in p xoay chiu c gi tr hiu dng U2 = 12 V, tn s f = 50 Hz th cng sut tiu th cun dy bng A: 8 W.B: 1,728 W.C: 4,8 W.D: 1,6 W. Cu 7:Mch chn sng ca mt my thu gm cun dy c t cm L=21( ) F t, t in c in dung C0=100(pF). Mch trn c th thu c sng in t A: =6m, thuc di sng di. B: =23.10-16m, thuc di sng cc ngn.C: =1,5.1016m, thuc di sng cc di D: =6m, thuc di sng cc ngn.Cu 8:C 2 vt dao ng iu ho,bit gia tc vt 1 cng pha vi li ca vt 2.Khi vt 1 qua v tr cn bng theo chiu dng th vt 2: A: Qua v tr cn bng theo chiu m..B: Qua v tr cn bng theo chiu dng. C: Qua v tr bin c li m. D: Qua v tr bin c li dng. Cu 9:Mt con lc l xo dao ng thng ng.Bit ln lc n hi cc tiu v cc i ln lt l 15N v 25N.Lc hi phc c ln cc i l: A: 25N B: 10NC: 15ND: 5N Cu 10: Chn pht biu sai: A: Hai dao ng iu ho cng tn s,ngc pha th li ca chng lun lun i nhau. B: Khi vt nng ca con lc l xo i t v tr bin n v tr cn bng th vect vn tc v vect gia tc lun lun cng chiu. C: Trong dao ng iu ho,khi ln ca gia tc tng th ln ca vn tc gim.D: Dao ng t do l dao ng c tn s ch ph thuc c tnh ca h,khng ph thuc cc yu t bn ngoi. Cu 11: Mt con lc nc chiu di l.Trong khong thigianA t n thc hin 12 dao ng .Khi gim di mt lng 32cm thcng trong khong thi gian ni trn,con lc thc hin 20 dao ng. Chiu di l ban u ca con lc l: A: 60cm B: 50cm C: 40cm D: 80cm Cu 12: Cho hai dao ng iu hocngphngx1 = 5 3 cos10t (cm )v x2=2A sin10t (cm) .Bit bin ca dao ng tng hp l 10cm.Gi tr ca 2Al A: 5cm B: 4cm C: 8cmD: 6cm Cu 13: Mt ngun sng ti O c phng trnh u0 = asin(10t t) truyn theo phng Ox n im M cch O mt on x c phng trnhu = asin(10 t - 4x), x(m). Vn tc truyn sng lA: 9,14m/s B: 8,85m/s C: 7,85m/s D: 7,14m/s Cu 14: Mtsi dy thp nh hnhch U c haiu S1, S2 cchnhau 8cm c gn vo u ca mt cn rung dao ng iu ha theo phng thn