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KCSE CLUSTER TESTS 16

Physics Paper 2

SECTION A (25 Marks)

Answer ALL questions
1.

State the laws of reflection

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2 marks

2.

Figure 1 shows a ray of light incident on a mirror at an angle of . Another mirror is placed at an angle of to the first one as shown

Sketch the path of the ray until it emerges

2 marks

3.

An electric heater of resistance is connected to a 240v mains supply. Determine the energy dissipated in 4 minutes ....................................................................................................................................................... .......................................................................................................................................................

3 marks

4.

The diagram below shows a wave of frequency 20H2 in motion. Determine the velocity of the wave.

3 marks

5.

Figure 2 shows how bar magnets are stored. Identify the poles induced in keepers

2 marks

6.

The figure below shows a current – carrying coil in a magnetic field.

i) Mark on the figure the direction of the forces acting on the sides of the coil

ii) State two ways of increasing the force on the coil.

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3 marks

7.

A boy standing in front of a cliff blows a whistle and hears the echo after 3.0s. He then moves 12cm closer to the cliff and blows the whistle again. He now hears the echo after 2.3s. Determine the speed of sound in air.

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3 marks

8.

Give a reason why the caps of the cells of a lead –acid battery are open when charging the battery.

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1 marks

9.

The figure below shows the main features of a gold leaf electroscope. Use it to answer question 9 and 10.

a) Identify the parts labeled by letters

A..................................................................................

B..................................................................................

b) State the function of part labeled A

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3 marks

10.

a) Why is earthing necessary?

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b) State two ways of discharging an electroscope

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3 marks

SECTION B (55 Marks)

Answer ALL questions
11.

a) In the circuit set up below, a current of 1A flows through the resistor.

Calculate

i) the total resistance

................................................................................................................................................. .................................................................................................................................................

ii) the current through the resistor

b) Differentiate between electromotive force and potential difference of a cell. .......................................................................................................................................................

c) The figure below shows how the terminal voltage V of a certain cell varies with the current I being drawn from it.

I) Sketch a circuit diagram that could be used to obtain similar results

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II) Use the graph to determine the e.m.f E and internal resistance r of the cell ................................................................................................................................................. .................................................................................................................................................

13 marks

12.

a) The figure below shows the image of an object placed in front of a convex mirror. On the same diagram, draw appropriate rays to locate the position of the object.

For the glass material, determine:

i) the critical angle

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ii) the refractive index

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c) The figure below shows one of the common eye defects

i) State the type of defect and its possible cause.

................................................................................................................................................ ................................................................................................................................................

ii) On the same diagram, show how the defect can be corrected

11 marks

13.

A capacitor was connected in a circuit and charged until it was full. The potential difference (P.d) across it was measured using a voltmeter. The corresponding values of the charge stored was calculated and tabulated in the table below.

a) On the grid provided, plot a graph of the charge stored against the Pd.

b) Using the graph, determine:

i) The capacitance of the capacitor.

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ii) The energy stored by the capacitor.

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c) The figure below shows a capacitor network set up.

Calculate the charge stored by the 1.5μF capacitor.

................................................................................................................................................. .................................................................................................................................................

13 marks

14.

The figure (a) below shows a telephone receiver. When the telephone is lifted, a steady current flows through the solenoids. When a person speaks into the microphone on the other side, a varying current flows. These two currents are shown in the figure b) below.

i) State the reason why the coils are wound in opposite directions

........................................................................................................................................... ...........................................................................................................................................

ii) Briefly explain how the speech current from the microphone is converted into sound in the receiver. ........................................................................................................................................... ...........................................................................................................................................

iii) State and explain the effect of replacing the soft iron pole pieces with steel pole pieces. ........................................................................................................................................... ...........................................................................................................................................

9 marks

15.

a) Explain the term wavefront as used in waves

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b) The figure below shows sound waves emitted by a source travelling at night.

i) What property of sound waves is illustrated by the diagram above.

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ii) Explain why the wavefront is curved

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c) The figure below shows two loudspeakers S1 and S2 connected to a signal generator.

i) An observer walks along XY. State what is observed

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...................................................................................................................................

ii) Give a reason for the above observations

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iii) Another observer walks along AB state what he observes

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9 marks

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