The S.I. unit of work is:

1. Joule
2. erg
3. Newton
4. dyne

A coolie A takes 1 minute to lift a load to the roof of a bus whereas coolie B take 2 minutes to lift the same load to the roof of the same bus. The work done by B is:

1. equal to work done by A
2. greater than work done by A
3. less than work done by A
4. none of the above.

kWh is the unit of

1. Power
2. Force
3. Energy
4. None of these

1 Joule is equivalent to …………… erg

1. 10⁵
2. 10⁷
3. 10⁹
4. 1