The graph given below shows heat energy supplied against change in temperature when no energy is lost to the surrounding. The slope of this graph will give :

1. Specific heat capacity
2. Latent heat of fusion
3. Latent heat of vaporization
4. Heat capacity

A block of glass is pushed into the path of the light as shown below. Then the converging point X will :

1. Move away from the slab
2. Move towards the slab
3. Not shift
4. Move towards the left side of the lens

Fill in the blanks :

(a) When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides …………… force necessary for circular motion.

(b) Work done by this force at any instant is …………… .

A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.