(a) Give a simple example to prove that heat is a form of mechanical energy.
(b) Name three devices/industries in which heat energy is put to some useful work.

Give an example to show that heat is a form of energy.

(a) Give a simple example in nature to prove that light is a form of energy. (b) Give examples to prove (i) light energy changes into chemical energy. (ii) light energy changes into electric energy.

(a) Give a simple example to prove that sound is kind of energy. (b) Name a device which converts sound dnergy into (a) electric energy (b) magnetic energy.

Name the form of mechanical energy, which is put to use for doing work.

Give one relevant example for the following transformations of energy: Electrical energy to heat energy.

Give one relevant example for the following transformations of energy: Chemical energy to heat energy.

Give one example to show the conversion of potential energy to kinetic energy when put in use.

Name two factors on which the heat energy liberated by a body depends.

(a) Why is electric energy considered most desirable forms of energy ? (b) Name two devices which convert electric energy into : (i) heat energy only (ii) heat and light energy. (iii) mechanical energy (iv) magnetic energy.

Give three examples of inter-conversion of chemical energy into other forms of energy.