Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : In a meter bridge experiment, null point for an unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.

Reason (R) : Resistance of metal increases with increase in temperature.

In the light of the above statements, choose the correct answer from the options given below

• A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
• B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
• C. If Assertion is true but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (D)

If both Assertion and Reason are false.

Answer 2

As there is an increase in temperature, then the value of unknown resistance will increase. In balanced condition, (referred Wheatstone bridge) $\frac{R}{X}=\frac{l_{1}}{l_{2}}$ where, $R=$ standard (known resistance) $X=$ unknown resistance.