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

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.

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