Lenz's law is based on the law of conservation of:

1. force
2. charge
3. mass
4. energy

Heat capacity of a body is:

1. the energy needed to melt the body without the change in its temperature.
2. the energy needed to raise the temperature of the body by 1°C
3. the increase in the volume of the body when its temperature increases by 1°C
4. the total amount of internal energy that is constant.

The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making the coil of a toaster?

1. Q
2. S
3. P
4. R

Vibrations produced in a body under the influence of the periodic force is;

1. forced vibrations
2. resonant vibrations
3. damped vibrations
4. sympathetic vibrations