The diagram below shows a magnetic compass kept closer to a coil AB wound around a hollow cylindrical cardboard :

(a) After studying the circuit and the magnetic compass carefully, state whether the switch S₁ is open or closed.

(b) How did you arrive at the conclusion in (a)?

(c) What is the purpose of placing the magnetic compass in the above setup?

(a) Give an important reason for copper to be used as a material for a calorimeter.

(b) Calculate the thermal capacity of 40 g of water.

[Specific heat capacity of water = 4200 JKg^-1°C^-1]

Three wires with proper colour coding are connected to the three terminals of a three-pin socket. Match the colour of the wire with the proper terminals A, B and C of the socket.

(a) Brown

(b) Green

(c) Light blue

(a) Why does it become colder after a hailstorm than during or before the hailstorm?

(b) 'If two bodies have the same specific heat capacities, then they will always absorb the same amount of heat if their temperature increases by the same amount.' State whether the given statement is true or false.