NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Analyzing +4 | -1

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

{p}

as before by decreasing the value of the standard resistance.

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

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Correct option: D

If both Assertion and Reason are false.

Option D (If both Assertion and Reason are false) is correct because increasing the temperature of the unknown resistance will increase its resistance, requiring an increase in the standard resistance to maintain the null point. Semiconductors have a negative temperature coefficient.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

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(E) The drift velocity increases with the increase in the temperature of conductor.
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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}