Electric Circuits
Resistance of which material does not change with change in temperature?

 Brass.
 Tungsten.
 Metal alloys constantan and manganin.
 Platinum.

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of alternating frequency at any instant.
 The value of alternating quantity at any instant.
 The value of peak quantity at any instant.
 The value of peak current at any instant.

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