Physics Past Questions and Answers

(a) State Faraday’s second law of electrolysis.
(b) An electric charge of 9.6 x 10\(^4\) C liberates 1 mole of substance containing 6.0 x 10\(^{23}\) atoms. Determine the value of the electronic charge

Explain the following terms:
(a) tensile stress;
(b)Young’s modulus

a) Define diffusion.
(b) State two applications of electrical conduction through gases.

a) List two properties of cathode rays.
(b) Explain how the intensity and energy of cathode rays may be increased

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.