(a) What is meant by;

(i) anode;

(ii) cathode, as used in electrolysis?

(b) List the ions involved in an electrolytic process with dilute tetraoxosulphate (VI) acid as electrolyte

(a) Explain how neon signs can be produced.

(b) State two factors on which the colour of light from a fluorescent tube depend.

Explain why a direct electric current is used instead of an alternating current in electroplating.

(a) (i) What is meant by a machine?

(ii) List two examples of a simple machine.

(iii) Explain the statement — the velocity ratio of a machine is 5.

(b) (i) Define the efficiency of a machine.

(ii) Explain why a machine can never be 100% efficient.

(c) A screw jack, 25% efficient and having a screw of pitch 0.4 cm is used to raise a load through a certain height. If in the process, the handle turns through a circle of radius 40.0 cm, calculate the;

(i) velocity ratio of the machine; (ii) mechanical advantage of the machine; (iii) effort required to raise a load of 1000 N with the machine. [Take \(\pi\) =3.14]

 (a) (i) Define relative density.

(ii) List three characteristics of pressure in a liquid.

(b) The horizontal door of a submarine at a depth of 500m has an area of 0.4m\(^{2}\). Calculate the force exerted by the sea water on the door at this depth. [Relative density of sea water = 1.03 ] [Atmospheric pressure =- 1.01 x 10\(^{5}\) Nm\(^{-2}\)] [Density of pure water = 1000kgm\(^{-3}\)] [g = 10ms\(^{-2}\)]

(c) (i) List three effects of heat other than expansion.

(ii) Explain saturated vapour pressure.

(iii) A heating coil of resistance 20 \(\Omega\) connected to a 220 V source is used to boil a certain quantity of water in a container of heat capacity 100 J kg\(^{-1}\) for 2 minutes. If the initial temperature of the water is 40° C, calculate the mass of the water in the container. [specific heat capacity of water = 4.2 x 10\(^3\) Jkg\(^{-1}\) K\(^{-1}\)] [assume boiling point of water = 100°C]