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PHYSICS
Paper 2 Subjective Questions
1 hour 15 minutes
Candidate answer on the question Paper
No Additional Materials are required
READ THESE INSTRUCTION FIRST
Write in blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
Answerall the questions.
You may lose marks if you do not show your working or if you do not use appropriate units.
Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 ms-2)
For Examiners Use
NO. Full marks Marks obtain
1 10
2 10
3 5
4 7
5 5
6 7
7 7
8 8
9 12
10 9
Total
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1. The Figure 4 below shows a sailor on a boat observing an object on the seabed.
FIGURE 4
(a) (i) Determine if the depth of the object seen by the sailor is the real depth of
the object.
(2 marks)
(ii) Explain your answer in (a) (i)
__________________________________________________________
__________________________________________________________
(2 marks)
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(b) In the Figure 4a below, draw a ray diagram from point O to the eye to show
how the sailor observes the object.
FIGURE 4a
(3 marks)
(c) The depth of the object seen by the sailor is 4 m from the surface of
seawater. Calculate the depth of the sea. [Refractive index of seawater is
1.35]
(3 marks)
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2.
DIAGRAM 2
The Diagram 2 shows a trawler used in deep-sea fishing using a sonar device.
(a) State the phenomenon of the application of the sonar device.
_____________________________________________________ (2mark)
(b)The frequency of sonar is 6.0 x 10 Hz. The velocity of the sound in sea
water is 1500 ms .
(i) Why does the sonar device use sound with high frequency?
_________________________________________________________
(2 marks)
(ii) What is the wavelength of the sound in the sea water?
__________________________________________________________
(2 mark)
8
1
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(iii) If the time interval between transmitting and receiving sound wave is 0.2
s, how far is the shoal of fish from the trawler?
__________________________________________________________
(2 mark)
(c) State another use of the sonar device.
_____________________________________________________________
(2mark)
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3.
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4.
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5.
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6.
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7.
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8.
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9.
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10.
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