I. Coherence II. Same frequency III. Same wavelength IV. Same Intensity

Which of the conditions above are necessary to produce interference fringes?

• A. I and III
• B. I, II and IV
• C. I, II and III
• D. II and III

Which of the following statements is true of the properties of a moving coil galvanometer?

• A. THe coil has a small area
• B. There are strong hair springs to gives a large control panlel
• C. There is a strong permanent magnet to give high magnetic flux
• D. it has a small number of turns of coil

The angle of incidence of a ray of light on a plane mirror is 55°. Determine the angle between the reflected ray and the mirror

A certain far - sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm

• A) 0.06 D
• B) 0.02 D
• C) 0.03 D
• D) 2 D

The lead-acid accumulator consists of a

• A. lead as the positive electrode
• B. lead ocide as the negative electrode
• C. hydrochloric acid as the electrolyte
• D. tetraoxosulphate(VI) acid as the electrolyte

Which of the following gas laws is equivalent to the work done?

• A) Boyle' law
• B) Charles law
• C) Pressure law
• D) van der Waal's law

Total internal reflection occurs in an optical prism when light rays

• A. travel from the prism into an optically denser medium
• B. are incident in the prism at an angle greater than the critical angle
• C. are incident normally in the prism
• D. travel from the prism to the air

A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.

• A. 2.00s
• B. 0.83s
• C. 0.08s
• D. 0.60s

a) Given a retort stand and clamp, a stout pin, a simple pendulum and a pencil, describe how you would use these apparatus to determine the centre of gravity of an irregularly shaped piece of cardboard of a moderate size.

(b) Using a suitable diagram, explain how the following can be obtained from a velocity-time graph:

(i)  acceleration;

(ii) total distance covered.                                                                                   

(c ) A body at rest is given an initial uniform acceleration of 6.0 ms\(^{-2}\) for 20s after which the acceleration is reduced to 4.0 ms\(^{-2}\) for the next 10s.

The body maintains the speed attained for 30s.

Draw the velocity-time graph of the motion using the information given above.  From the graph, calculate the:

• maximum speed attained during the motion;
• total distance traveled during the first 30 s;
• average speed during the same time interval as in (ii) above.

A train has an initial velocity of 44m/s and an acceleration of -4m/s2. Calculate its velocity after 10 seconds

• A. 10m/s
• B. 6m/s
• C. 8m/s
• D. 4m/s