Skema Paper 3doc

7/28/2019 Skema Paper 3doc

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SKEMA JAWAPAN KERTAS 3PEPERIKSAAN AKHIR TAHUN 2010 TINGKATAN EMPAT

Section A

Question Mark Scheme Submark

Totalmark

1(a) (i) Able to state the manipulate variable

Weight / W // mass, m // Force, F 1

(ii) Able to state the responding variableExtension of spring/ x, // final reading of spring 1

(iii) Able to state the constant variableDiameter of spring/ initial length of spring/lo, type of spring 1

(b) (i) Able to state of the value of l

l1 = 46.0 cml2 = 59.0 cml3 = 71.0 cml4 = 83.0 cml5 = 95.0 cm

3 to 4 correct -> 1 markAll correct -> 2 marks 2

(ii) Able to state of the value of x

x1 = 36.0 cm

x2 = 49.0 cmx3 = 61.0 cmx4 = 73.0 cmx5 = 85.0 cm

3 to 4 correct -> 1 markAll correct -> 2 marks 2

(iii) Able to tabulate W, l and x

Tick () based on the following aspectA Quantities l, x and W shown in headingB Unit cm , cm and N shown in headingC All values for l and x consistent

l/cm x/cm W/N

46.0 36.0 30.0

59.0 49.0 40.0

71.0 61.0 50.0

83.0 73.0 60.0

95.0 85.0 70.0

11

1

(c) Able to draw a complete graph of W and x

Tick () based on the following aspects:

A Show x on Y axis and W on the X axisB State the units of the variables correctlyC Both axis are marked with uniform scale


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D All five points are plottedE Best straight line is drawnF Show the minimum size of graph at least

5 x 4 (2 cm x 2 cm) square(counted from the origin until the furthest point)

Number of Score

7 5

5 6 4

3 4 3

2 2

1 1

(d) Able to state the correct relationship between x and Wx is directly proportional to W

x WTOTAL 16

2(a) Able to state the relationship between P and V

Inversely proportional

1

(b)(i) Able to calculate the gradient, m- Draw the sufficiently large triangle (4x4)- Correct substitution (Follow the candidates triangle)= 0.012

12= 1 x10-3 N-1cm-1 (Answer with the correct unit)

11

1

(ii) Able to calculate the value of k,- Correct substitution- 1

1 x10-3

= 1 x103 N cm (Answer with the correct unit)(Answer without unit 0 mark)

1

1

(iii) Able to calculate the value of V,- Correct substitutionV = 1 x10-3

20= 50 cm3

1

1

(c) Able to read the value of 1/V- show the vertically line corresponding to P / horizontal line- Correct substitution

1 = 0.012V- V = 83.3 cm3

11

1

(d) Able to state one correct precaution- Make sure the cylinder is air tight.- Make sure the position of eye must be perpendicular to the

reading scale of measurement.- Take the reading twice and find the average.

( Any one answer can acceptable)

1

TOTAL 12


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Section B

Question Submark

Mark Scheme Total mark

3(a) 1 Making the right inferenceAcceleration depends on mass

(b) 1 Build ing an approp riate hypo thesisThe greater the mass, the greater the acceleration.

(c)(i) 1 Stat ing the aim of the experimentTo study the relationship between the acceleration andmass of an object under constant force

(ii) 1

1

Stating the correct variables

Manipulated variable : Mass, mResponding variable : Acceleration, aFixed variable : Force

(iii) 1 List o f approp riate apparatus and m ateria lRuler, A.C. power supply, runway, ticker tape, ticker timerand elastic cord

(iv) 1 Describ ing set up of the apparatus

v)

1

11

Stat ing the pro cedure of the experiment

Set up a friction compensated track.

Attach a ticker tape to the trolley and pass the tapethrough the ticker timer.Pull the 1 kg trolley down the runway with the elastic cordkept stretched by the same amount of force.Calculate acceleration by analysing the ticker tape.Repeat by adding weights to the trolley so that the massis 1.5 kg, 2.0 kg, 2.5 kg and 3.0 kgRecord dataPlot an a against m graph // Plot an a against 1/m graph .

vi) 1 Tabulating dataShow table with m and a as headings

Mass /kg Acceleration/ms-

1.0

1.5

2.0

2.5

3.0

viii) 1 Analysing dataa a

orm 1/m

**This markmay be

given at thelast line forprocedure.

TOTAL 12

a.c power

Ticker tape

Elastic cord

Ticker timer Trolley

Friction compensated track


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4

QuestionSubmark

Mark Scheme

4(a) 1 Making the right inferenceThe pressure exerted on shoe depends on its surfacearea contact

(b) 1 Build ing an approp riate hypo thesisThe larger surface area of contact, the greater thepressure exerted

(c)(i) 1 Stat ing the aim of the experimentTo study the relationship between surface area ofcontact and pressure

(ii) 1

1

Stating the correct variables

Manipulated variable : surface area of contact, AResponding variable : Pressure, P / depth of depressionFixed variable : Force/weight

(iii) 1 List of approp riate apparatus and materialPlasticine, wooden block 50g with different surface

area (2cm, 4cm, 6cm, 8cm, and 10cm), meter rule

(iv) 1 Describ ing set up of the apparatus

v)

1

11

Stat ing the pro cedure of the experiment

1. Plasticine with constant thickness is placed onthe table

2. Place a wooden block with surface area is 2cm3. A wooden block of 50g is released from a height

of 20.0 cm onto the plasticine.4. Remove the wooden block and measure the

depth, d of the depression on the plasticine usingmeter rule.

5. Repeat the steps by using wooden block withsurface area 4cm, 6cm, 8cm, and 10cm

vi) 1 Tabulating data

Surface area/ cm Depth of depression/ cm

2.0

4.0

6.0

8.0

10.0

viii) 1 Analysing datad/cm

A/ cm

**This markmay be

given at thelast line forprocedure.

TOTAL 12

Wooden

blockMeter rule

Plasticine


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