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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Easy

1 of 1

Application +4 | -1

The resistance of a

240 \mathrm{~V}

and

200 \mathrm{~W}

electric bulb when hot is 10 times the resistance when cold. Find its resistance at room temperature. If the working temperature of the filament is

2000^{\circ} \mathrm{C}

, find the temperature coefficient of the filament.

View answer and explanation

Correct option: B

4.5 \times 10^{-3}{ }^{\circ} \mathrm{C}^{-1}

Option B (

4.5 \times 10^{-3}{ }^{\circ} \mathrm{C}^{-1}

) is correct because it is the temperature coefficient calculated using the change in resistance with temperature.

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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}