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NAME:………………………………………………ADM NO ………………..CLASS……..………

INDEX No……………………………………………DATE……………………SIGNATURE……..

232/2

PHYSICS

PAPER 2

JULY 2017

2 HOURS

END OF TERM II EXAMINATION

QUESTION PAPER

232/2

PHYSICS

PAPER 2

Instructions to candidates

i) Write your name, admission number and other particulars in the spaces provided ;

ii) Answer all questions in section A and B in the spaces provided after each question;

iii) All working for numerical questions must be clearly shown;

iv) Non programmable silent electronic calculators may be used

v) This paper consists of 9 printed pages, check and ascertain all pages are printed

vi) The paper is out of 80 marks;

Constants

You may use the following constants where necessary

i) Speed of Sound is 330ms-1

ii) Refractive index of glass = 3/2

iii) Refractive index of water = 4/3

For Examiner's Use Only

Section Question Maximum Score Candidate's Score

A 1-11 25

B 12 8

13 12

14 11

15 12

16 12

Total Score 80

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SECTION A (25 Marks)

Answer all the questions in this section in the spaces provided

1. Figure 1 below shows a ray of light incident on a plane mirror at O.

The mirror is rotated through an angle of 250 about an axis perpendicular to the paper .Determine

the angle through which the reflected ray is rotated (2mks)

2. A car battery requires topping up with distilled water occasionally. Explain why this is necessary

and why distilled water is used. (2mks)

3. The figure below shows two parallel current carrying conductors A and B cutting through a piece of

cardboard.

i. Sketch the magnetic field pattern produced. (2mks)

ii. Identify the nature of the force between them (1mk)

4. Distinguish between ultraviolet rays and infrared (1mk)

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5. A student synchronizes his watch with a church bell 2km away. The following morning, there is a

wind. .He notes that the church bell sounded 0.15s later. Assuming his watch was correct and bell

was sounded at the usual time. Determine the direction and the speed of the wind.

(Assuming the speed of sound in still air is 340m/s) (3mks)

6. The figure below shows an illustration of a good storage magnets

State and explain the material suitable for Y (2mks)

7. The figure below shows a circular wave approaching a plane barrier in uniform medium.

On the diagram sketch the reflected waves in water (2mks)

8. A negatively charged rod is brought near the cap of a leaf electroscope. The cap is them earthed

momentarily by touching with finger. Finally the rod is withdrawn .State and explain the

observation made. (2mks)

9. The following equation represents a decay series

R83210 x P84

210 Qb9

i. Identify radiation x. (1mk)

ii. Determine the values of a & b. (2mks)

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10. The figure below shows a circuit where a battery of e.m.f 4.5V, Switches A &B, two capacitors

(C1=0.6µF and C2=1.0µF) and a voltmeter are connected.

i. Determine the charge on C1 when the switch A is closed and switch B is open. (2mks)

ii. What is the effective capacitance C when both switches A and B are closed? (2mks)

11. Describe the energy charges that occurs in the cathode ray tube. (1mk)

SECTION B (55MKS)

12. (a)Two coins were placed at the bottom of two jars each containing a different clear liquids as

shown below.

The liquids in the two jars are at the same level. The coin in jar Q appears shallower than in jar P.

Explain (2 mk)

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(b)A ray of light travels from air to glass as shown below.

Given that the critical angle of glass is 420

Determine the value of angle X. (4mks)

(c)The figure below shows a ray of eight incident on a triangular prism and a white sources is

placed in front of the screen.

Complete the diagram to show the path followed by the ray up to the screen. (2mks)

13. (a)Sate faraday’s law of electromagnetic induction. (1mk)

(b)The figure below shows a simple transformer. Study it and answer the questions that follow.

i. Explain why the core is a continuous loop (1mk)

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ii. Give a reason as to why the cure is laminated. (1mk)

iii. State and explain which coils are thicker. (2mks)

iv. Sate one difference and one similarity between a step up transformer and induction coil.

(2mks)

(d) State two advantages of the use of alternating voltage for the transmission of electrical energy.

(2mks)

(e) The primary coils of a transformer have 2000 turns and carries a current of 3A. If the secondary

coil is designed to carry a current of 30A. Calculate the maximum number of turns in the secondary

coil. (3mks)

14. (a)State Ohm’s law (1mk)

(b)The figure below shows how a student set up a circuit using 3 identical bulbs X, Y and t each

rated 12V, 2.0A

i. When operating normally calculated the resistance of the bulbs. (2mks)

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ii. Calculate the effective resistance of the three bulbs. (2mks)

iii. What will be reading of the ammeter? (2mks)

(c)When a switch is kept open in the circuit shown below the voltmeter reads 1.5V, when the switch

is closed, the reading drops to 1.3V and the current through the resistor is 0.5A.

i. What is the emf of the cell (1mk)

ii. What is the terminal voltage of the cell (1mk)

iii. Calculate the valve of R (2mks)

15. (a)The figure below shows an object in front of a lens.

i. Using rays locate the image as seen by the eye. (2mks)

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ii. Give one application of such a such a dens as used above. (1mk)

(b)Figure (a) and (b) shows diagrams of human eye

i. In figure (a),sketch a vary diagram showing long sightedness.(1mk)

ii. In figure (b) sketch a ray diagram shown how lens is used to correct long sightedness.(2mks)

(c)An object of height 10.5am stands before a diverging lens of focal length 20cm and a distance of

10cm from the lens.

Determine

i. The image distance (2mks)

ii. Height of the image (2mks)

iii. Magnification (2mks)

16. (a)State two differences between cathode rays and electromagnetic radiation (2mks)

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(b)The figure below shows the main features of a cathode ray oscilloscope (CRO)

i. Name the parts labeled M and N. (2mks)

ii. Explain how electrons are produced in the tube (2mks)

iii. When using the CRO to display waveforms of voltages, state where the following should be

connected.

iv. The voltage to be displayed on the screen (1mk)

v. The time base voltage(1mk)

vi. Sate why the tube is highly evacuated(1mk)

(c)The figure below shows the waveform of a signal applied at the y-plates of an oscilloscope while

time base is switched to the scale of 2milliseconds per minutes.

Determine the frequency of the signal (3mks)