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

(a) In the diagram illustrated, a body of mass m slides on an inclined plane. Show that the coefficient Mg of friction between the surfaces in contact is tan...

Explain why sound waves cannot be plane Polarized.

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

(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...

(a) Explain wave-particle duality of light. (b) Illustrate your answer in (a) with observable phenomena.

(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.

The diagram above illustrates an arrangement of a cathode ray from an electron gun and a bar magnet placed perpendicularly to the direction of the ray. Will ...

A ray of light is incident on an air-glass boundary at an angle \(\theta\). If the angle between the partially reflected ray and the refracted ray is 90°, ca...