Find the odd one out.

1.       Loudspeaker, microphone, electric motor, bar magnet.

Ans. Bar Magnet: - It is a magnet while the rest are devices working on electromagnetism.

2.       Armature coil, brushes, commutator, direct current.

            Ans. Direct current: - The rest are parts of a generator.

3.       Fuse, insulating material, rubber shoes, generator.

Ans. Generator: - The rest are safety measures in using electricity.

4.       Voltmeter, ammeter, galvanometer, thermometer.

Ans. Thermometer: - The rest are dives working on electromagnetism.