In nuclear fission:

1. chemical energy changes to electrical energy
2. mechanical energy changes to chemical energy
3. nuclear energy changes to electrical energy
4. electric energy changes to nuclear energy

In an electric cell while in use, the change in energy is from:

1. electrical to mechanical
2. electrical to chemical
3. chemical to mechanical
4. chemical to electrical

Name the form of energy which a wound-up watch spring possesses.

Name the type of energy (kinetic energy K or potential energy U) possessed in the following cases:

(a) A moving cricket ball

(b) A compressed spring

(c) A moving bus

(d) A stretched wire

(e) An arrow shot out of a bow.

(f) A piece of stone placed on the roof.