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Assertion (A): Meter bridge wire is gene...

Assertion (A): Meter bridge wire is generally made of Constantan.
Reason (R ): Constantan has a very low temperature coefficient of resistance.

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

A is true but R is false

D

A is false and R is true

Text Solution

Verified by Experts

The correct Answer is:
A
Meter bridge wire is generally made of Constantan. The assertion is true.
Temperature coefficient of resistance of Constantan is very low. So, its resistance variation is negligible even after long use. This is the requirement of an ideal meter bridge. So the reason is true and properly explains the assertion.
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Knowledge Check

  • Assertion: meterbridge wire is made up of manganin Reason: The temperature coefficient of resistance is very small for manganin

    A
    Both (A) and (R) are true and (R) is the correct explanantion of A.
    B
    Both (A) and (R) are true but (R) is not the correct explanation of A.
    C
    (A) is true but (R) is false
    D
    (A) is false but (R) is true.

  • Assertion: Material used in the construction of a standard resistance is constantan or manganin. Reason: Temperatures coefficient of constan is very small.

    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
    A is true but R is false
    D
    A is false but R is true

  • Statement I : Material used in the construction of a standard resistance is constantan or manganin. Statement II : Its temperature coefficient of resistance is very small.

    A
    If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I.
    B
    If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement – I.
    C
    If Statement - I is true but Statement - II is false.
    D
    If Statement - I is false but Statement - II is true.

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