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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Hard

1 of 1

Application +4 | -1

A battery is charged to a voltage of

15 \mathrm{~V}

for 8 hours with

10 \mathrm{~A}

current. On discharge, the battery supplies a current of

5 \mathrm{~A}

for 15 hours at a mean terminal voltage of

14 \mathrm{~V}

. The efficiency of the battery is

View answer and explanation

Correct option: C

87.5 \%

Option B (Halved) is correct because conductance is inversely proportional to the length of the wire. Doubling the length halves the conductance.

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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

is In a thermocouple, which of the following statements is not true (A) The drift velocity of electrons decreases with the increase in the temperature of conductor.
(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
(C) The drift velocity does not depend on the applied potential difference to the conductor.
(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.
Choose the correct answer from the options given below The mass of ions deposited during a given interval of time in the process of electrolysis depends on The steady current flows in a metallic conductor of non-uniform cross-section. The

\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

constant along the length of the conductor

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