Waec Physics 2009 Past Questions and Answers

Question 51:

• WAEC 2009

(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

Question 52:

• WAEC 2009

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

Question 53:

• WAEC 2009

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

Question 54:

• WAEC 2009

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

Question 55:

• WAEC 2009

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.