When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by:

1. I²Rt
2. IR²t
3. IRt
4. IRt²

Specific heat capacity of a substance X is 1900 Jkg^-1°C^-1 means:

1. Substance X absorbs 1900 J for 1°C rise in temperature
2. 1 kg of substance X absorbs 1900 J heat for 1°C rise in temperature
3. 1 kg of substance X absorbs 1900 J heat to increase the temperature
4. 1 kg of substance X absorbs 1900 J heat to cool down by 1°C

Choose the correct relation for e.m.f. (ε) and terminal voltage V:

1. ε = V [always]
2. V > ε [always]
3. V < ε [when the cell is in use]
4. None of these

Specific latent heat of a substance:

1. is directly proportional to the mass
2. is directly proportional to the change in the temperature
3. depends on the material
4. is inversely proportional to the mass