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Q.

Is it true that a key which is used in an electric circuit, is made up of metal?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
A key is the part of an electric switch inserted in the switch plug to connect the two ends of a circuit wire to close the electric circuit; as we know, metals are good conductors of electric current. That’s why a key is made up of metal, which establishes the continuity of the flow of the electric current in the circuit.
 
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