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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Hard

1 of 1

Application +4 | -1

It takes 12 minutes to boil 1 litre of water in an electric kettle. Due to some defect it becomes necessary to remove

20 \%

turns of heating coil of the kettle. After repair, how much time will it take to boil 1 litre of water?

View answer and explanation

Correct option: A

9.6

minute

Option A (

9.6

minute) is correct because the time taken to boil water is inversely proportional to the square of the number of turns in the heating coil.

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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

T

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(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(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}