Question

Find the odd one out:

(i) Voltmeter, ammeter, galvanometer, thermometer.
(ii) Loudspeaker, bar magnet, electric motor, microphone.

Answer 1

(i) thermometer
A thermometer is a device used for measuring temperature. The other devices are used to measure current and potential difference in a circuit.

(ii) bar magnet
In the other devices, one form of energy is converted to another form of energy.