(a) The diagram shows a bar magnet surrounded by four plotting compasses. Copy the diagram and mark the direction of the compass needle for each of the cases B, C and D.

(b) Which is the North pole, X or Y?

An object is placed in front of a converging lens. Then, draw the ray diagrams for following cases

(a) When object distance (u) > 2f.

(b) When image formed has the same size as that of object.

Explain any two factors on which the internal resistance of a cell depends.

When 2240 J of heat is supplied to a metal piece of mass 450 g, its temperature rises from 25°C to 65°C. Then, find

(a) heat capacity of metal piece and

(b) specific heat capacity of metal.