(a) State Faraday's law of electromagnetic induction.

(b) Draw a labelled diagram of an induction coil and explain how it works.

(c) How is the effect of eddy currents minimized in the coil?

(d) State two reasons why a capacitor should be included in the primary circuit of the coil.

(e) State three uses of an induction coil.

(a) What is surface tension? Explain the phenomenon in terms of intermolecular forces

(b) Describe a simple experiment to demonstrate the surface tension of a liquid

(c) State three examples to illustrate the effects of surface tension

(d) Why does water wet a clean glass surface whereas mercury does not?

(e) State two methods by which the surface tension of a liquid may reduced.

(a) Define the boiling it of a liquid.

(b) Describe with the a d. labelled diagram, an experiment to determire the boiling point of a small quantity of a liquid.

(c) factors that may affect the boiling point of a liquid

(d) Using the kinetic theory of matter, explain why pure water changes to steam at S.T.P. without any change in temperature, although heat is being supplied to the water.
 

(a) Explain the terms:- uniform acceleration and average speed.

(b) A body at rest is given an initial uniform acceleration of 8.0ms\(^{-2}\) for 30s after which the acceleration is reduced to 5.0ms\(^{-2}\) for the next 20s. The body maintains the speed attained for 60s after which it is brought to rest in 20s. Draw the velocity-time graph of the motion using the information given above.

(c) Using the graph, calculate the: (i) maximum speed attained during the motion; (ii) average retardation as the body is being brought to rest; (iii) total distance travelled during the first 50s; (iv) average speed during the same interval as in (ii). 

(a) Distinguish between temperature and heat. State the units in which they are measured

(ii) State two physical properties used for measuring temperature.

(b) (i) Describe, with the aid of a diagram, how the upper fixed point is determined for a mecury-in-glass thermometer. State one precaution to ensure accurate results

(ii) State one advantage which a constant-volume gas thermometer has over other thermometers and one reason why it is seldom used as an everyday laboratory instrument.

(c) Using the kinetic theory of matter explain why evaporation causes cooling.