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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY
1
Medium
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Understanding
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For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
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Correct option: D
The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells
Option D (The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells) is correct because the potential gradient developed must be higher than the emf of the cells being compared for a balance point to be obtained.
More Questions from CURRENT ELECTRICITY
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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 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 constant along the length of the 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 constant along the length of the conductor