(a) Define specific resistance.

(b) What happens to the specific resistance of a conductor if its length is doubled?

(c) Name a substance whose specific resistance remains almost unchanged with the increase in its temperature.

(a) Which nuclear radiation will travel undeviated in an electric field?

(b) How can one stop the radiations escaping from a nuclear reactor in a nuclear power plant?

(c) Name one internal source of background radiations.

Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C.

(Specific latent heat of ice = 336 J g^-1, specific heat capacity of water = 4.2 J g^-1°C^-1)

(a) State the principle of calorimetry.

(b) Name the material used for making a calorimeter.

(c) Write one characteristic property of the material chosen for making a calorimeter.