When a lead-acid accumulator is fully charged, evolution of gases occurs at the electrodes. Name these gases and the respective electrodes at which thcy are given off.

(a) State two factors which affect the mass of elements deposited during electrolysis.

(b) List two non-electrolysis.

(a) Differentiate between plane polarization and interference as applied to waves.

(b) List two uses of polaroids.

(a) List two examples each of substances with:

(i) low viscosity;

(ii) high viscosity.

(b) When is a liquid said to be viscostatic?

State one reason each why cathode rays:

(a) are not electromagnetic waves;

(b) cast sharp shadows of objects in their path;

(c) can rotate a light paddle wheel inside a discharge tube.