Physics Past Questions and Answers

In an electrolysis experiment, the ammeter records a steady current of 1A. The mass of copper deposited is 0.66g in 30 minutes. Calculate the error in the ammeter reading (Electrochemical equivalent of copper = 0.00033g C\(^{-1}\)).

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

(a) Define Young's modulus.
(b) State the physical quantities one has to measure in order to determine the Young's modulus of a wire.

(a) What is the principle upon which the lighting in fluorescent tubes operate?
(b) State two factors on which the colour of light from a fluorescent tube depends.

(a) List two types of waves, apart from light, that can be plane polarised
(b) State two applications of plane polarised light.