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# KNEC KCSE Physics Paper 2 Question Paper / 2016 KCSE KAMDARA JET Examination

## KNEC KCSE Physics Paper 2 Question Paper / 2016 KCSE KAMDARA JET Examination

### SECTION A (25 Marks)

1.

A ray of light makes an angle of 60° with a plane mirror as shown in Figure 1 below. The
mirror is rotated through an angle of 20° about the point O in a clockwise direction.

Determine the new angle of reflection.
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2 marks

2.

Describe how you would charge a gold leaf electroscope by induction method
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2 marks

3.

The figure 2 below shows a wire wound on a soft iron core.

Indicate the polarities of end A and B
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2 marks

4.

Describe two defects in simple cells and ways in which they can be minimized.
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2 marks

5.

Differentiate between Faradays law of electromagnetic induction and Lenz law.
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2 marks

6.

Figure 3 below shows a moving coil microphone.

Briefly explain how it works.
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2 marks

7.

An object is placed on the principal axis of a concave mirror. The image formed is upright
and magnified. If the object distance is 5cm and the image distance is 10 cm, determine
the focal length of the mirror.
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2 marks

8.

a) Differentiate between a transverse and a longitudinal wave. (1mk)
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b) Kenyatta National Hospital uses x-rays of wavelength 1×10-11m. Calculate the
frequency of the x-rays. (Take c= 3×108
m/s.) (2mks)
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3 marks

9.

A hunter standing some distance from a cliff blows a whistle and hears its echo 2 seconds
later. How far is the cliff from the hunter? (speed of sound in air=340m/s)
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2 marks

10.

Calculate the speed of light in a medium of refractive index 4/3 given that the speed of
light in air is 3×108 m/s.
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2 marks

11.

A wire of length 1.5m offers resistance of 6.5Ω to the flow of current through it. If the
cross section area is 5.0×10-6m2 .calculate the resistivity of the material.
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2 marks

12.

The Figure 4 below shows two coils used to demonstrate mutual induction.

State what happens to the galvanometer when K is closed.
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1 marks

13.

Figure 5 below shows two parallel plate capacitors separated by a distance d units. Each
plate has an area of A square units.

Suggest one adjustment that can be made so as to increase the effective capacitance.
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1 marks

### SECTION B (55 Marks)

14.

(a) What is the purpose of a fuse? (1 mark)
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(b) The diagram in figure 9 below shows a ring – main circuit used by an electrician in a
certain house.

(i) Identify two faults in the installation. (2 marks)
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ii) Explain why the 3 – pin plug fuse has a longer earth pin than the live and neutral pins.
(2 marks)
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iii) Identify the type of transformer T used in the diagram in Fig. 9 (1 mark)
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(c) A cooker rated 2.0kW was operated for 40minutes each for 30days. If the cost of each
kilo – watt – hour unit is Shs. 15.50, Calculate the cost of electricity used. (4 marks)

10 marks

15.

(a) The figure below show the displacement time graph of a wave traveling at 400cm/s.

Determine for the wave the:
(i) Amplitude (1mk)
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(ii) Period (1mk)
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(iii) Frequency (2mks)
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(iv) Wavelength (3mks)
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(b) The human ear can distinguish two sounds as separate only if they reach it at least
0.1s apart. How far from a wall must an observer be in order to hear an echo when he
shouts? (Speed of sound in air = 330ms-1) (3mks)
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10 marks

16.

The figure 7 below represents a cathode ray oscilloscope (C.R.O)

i) Name the parts labeled A and B (2mks)
A….…………………………………………………………………………………………
B .………………………………………………………………………………………….
ii) What are the functions of parts labeled C and D (2mks)
C ………………………………………………………
D ………………………………………………………………….
iii) Explain how electrons are produced. (2mk)
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iv) Give a reason why the tube is evacuated. (1mk)
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((b) i)Distinguish between cathode rays and light rays (2mks)
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(ii) State the function of A (1mk)
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(iii) An alternating p.d is applied across the Y-plates. State what is the effect on the
position of the spot on the screen? (1 mark)
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(iv) A signal with a frequency of 50Hz is applied across the Y-plates. If the time base with a
period of 0.04s is applied across the X-plates, sketch a graph of p.d against time showing
the number of waves that can be seen on the screen of the C.R.O (2 mks)

v) The tube of the CRO is coated with graphite. State three functions of the graphite coating
(3mks)
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10 marks

17.

(a) State one similarity and one difference between a concave lens and a convex mirror
(2mks)
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(b) A lens forms a focused image on a screen when the distance between the object
and the lens is 100cm. the size of the image is twice that of the object.
(i) What kind of lens was used? Give a reason (2mks)
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(ii) Determine the distance of the image from the lens (2mks)
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(iii) Determine the power of the lens (3mks)
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(c) The figure shown in figure 9 shown below is a human eye with a certain defect

(i) Name the defect (1mk)
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(ii) On the same diagram, sketch the appropriate lens to correct the defect and sketch rays to
show the effect of the lens. (2mks)

10 marks

18.

a) Name any two types of radiations given out in a radioactive process. (2marks)
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b) The half – life of cobalt – 60 is 5years.
How long will a sample take for the activity to decrease to 1/16 of its original value. (3mks)

c) The graph below shows radioactive decay of iodine.

Use the graph to determine the:-
(i) fraction of the amount remaining after 16.2 days. (2mks)

(ii) determine the half – life of iodine. (2mks)

(iii) mass remaining after 17 days. (1mk)

10 marks