Physics Past Questions and Answers

(a) Explain the term electrodes in electric cells.
b) An electric current passing through an electrolyte for 2 minutes deposited 200 g of a substance. If the electrochemical equivalent of the substance is 8.33 x 10\(^{-4}\)g C\(^{-1}\), calculate the current passed.

Explain why sound waves cannot be plane Polarized.

a) Define surface tension.
(b) State two methods by which the surface tension of a liquid can be reduced.

Explain why it is desirable to install an air conditioner near the ceiling of a room and not close to the floor.

(a) On what principle does lighting in a fluorescent tube operate?
(b) State two factors which determine the colour of light produced in a fluorescent tube.