Question

A …………… is a device by which resistance in a circuit can be varied continuously.
(a) key
(b) switch
(c) rheostat
(d) voltmeter

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Answer

(c) rheostat

Reason — A rheostat is a device by which resistance in a circuit can be varied continuously. It is used to adjust the magnitude of current in a circuit by changing the length of the resistance wire included in the circuit.

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