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KCSE CLUSTER TESTS 20

Physics Paper 2

SECTION A (25 Marks)

Answer ALL the questions in this section in the spaces provided.
1.

The figure 1 below shows an object, a screen and light sources A,B and C.

i) Complete the diagram to show the formation of a shadow.

ii) Explain why it is impossible to obtain a sharp edged shadow of the object.

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2 marks

2.

The figure 2 below shows two pith balls P and Q hanging from nylon threads and brought close to negatively charged rod.

Given that one of the pith balls is charged while other one is not, and the pith balls move in the direction shown by the arrows; i) State which ball is charged and the kind of charge on it.

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ii) Explain the behavior of the pith ball Q

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2 marks

3.

What is meant by polarization in a simple cell?

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2 marks

4.

The figure 3 below shows a soft iron ring placed between two poles of magnets

Sketch the resultant magnetic flux pattern between the two poles.

2 marks

5.

The figure 4 below shows two smooth horizontal copper bars connected to a battery and an aluminium rod rests across the bars. The arrangement stands in a vertical magnetic field.

State and explain the effect on the aluminium rod.

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2 marks

6.

Motorists use a convex mirror, rather than a plane mirror as a rear view. State the advantage of using the convex mirror.

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1 marks

7.

The figure 5 below shows how the displacement varies with time for a certain wave

Determine the frequency of the wave.

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3 marks

8.

A disc siren with 200 holes in rotated at a constant speed making 0.10 revolutions per second. If air is blown towards the holes, calculate the wavelength of the sound produced.(Take the velocity of sound in air to be 330m/s)

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3 marks

9.

The figure 6 below shows the path of a ray of light AB passing from glass to air, just glazing the surface of glass and air.

Complete the diagram to show the path of the ray of light CB after it emerges from the glass. Mark any angle you have calculated.

3 marks

10.

The figure 7 below shows waves A and B which passes through a point at the same time.

Given that the waves have equal amplitude, draw on the diagram the resultant wave. (1mk)

3 marks

11.

Three capacitors of capacitance 3mF,4mF and 5mF are arranged as shown in the circuit in the figure 8 below.

Find the effective capacitance

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3 marks

12.

State how a p-type semi-conductor is formed.

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1 marks

13.

An electrical device converts 78 joules of electrical energy to heat energy when 6 coulombs of charge pass through it. Calculate the p.d across the device.

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2 marks

14.

State two factors that affect photo electric emission.

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2 marks

SECTION B (55 Marks)

Answer ALL the questions in this section.
15.

a) What is meant by the term electromotive force of a cell?

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b) How much electrical energy does a battery of e.m.f. 12volts supply when a current of 4 amperes flows through it for 0.5 minutes?

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Use the graph to;

i) find the internal resistance, r.

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ii) find the e.m.f, E of the cell

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d)

i) Draw a circuit diagram to show how a 6V battery may be used to operate efficiently 3 headlamp bulbs each marked 6V, 24W’

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ii) Calculate the current supplied by the battery in (i) above.

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iii) Calculate the total effective resistance of the bulbs in (i) above.

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14 marks

16.

a) Distinguish between a real and a virtual image.

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b) The figure 10 below shows an object OA placed infront of a convex lens.

Complete the ray diagram to show the position of the image.

c) A defective eye focuses a distant object as shown in the figure below.

State the defect

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i) Suggest a suitable lens to correct the defect.

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ii) Complete the diagram below to show the correction of the defect.

d) An object 4cm high is at right angles to the principal axis of a diverging lens of focal length 20cm and at 30cm from it.

Determine:

i) The position of the image

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ii) The size of the image

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12 marks

17.

a) The figure 13 below shows a step up transformer

i) Calculate

I) The power input to the transformer.

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II) The power dissipated as heat in the primary coil of resistance 2Ω

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ii) State the power output from the transformer

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iii) Calculate the efficiency of the transformer.

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b) Explain why transmission cables carrying high voltages are supported high above the earth by pylons.

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11 marks

18.

a) The figure 14 below shows a Geiger Muller (G.M) tube

i) Give the reason why the mica window is made thin.

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ii) Explain how the radiation entering the tube through the window is detected by the tube.

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iii) What is the purpose of the halogen vapour

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b) A typical nuclear fission reaction is given below

i) Determine the values of x and y. (2mks)

x

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y

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ii) Name the particle A

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9 marks

19.

a) What is the difference between hard and soft X-rays.

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b) Explain how X-rays are produced in an X-ray tube.

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c) How can the intensity of X-rays produced be reduced?

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d) How can the penetrating power of the X-rays be increased?

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e) Calculate the velocity with which an electron strikes a target in an x-ray tube if the potential difference between the cathode and the Anode is 10KV

( take the mass of an electron=9.1 x1031kg and charge on an electron e=-1.6x10-19c)

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9 marks

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