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Q.

Assertion : Material used in the construction of a standard resistance is carbon.
Reason : Temperature coefficient of resistance of carbon is zero.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

Both (A) and (R) are correct

d

Both (A) and (R) are incorrect

answer is D.

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Detailed Solution

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Manganin and constantan alloys are used to make standard resistance coils because they have high resistivity, a low-temperature coefficient of resistance, and the ability to achieve good resistance values in a small size.
Temperature coefficient of resistance of carbon is slightly negative.

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Assertion : Material used in the construction of a standard resistance is carbon.Reason : Temperature coefficient of resistance of carbon is zero.