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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY
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Medium
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Analyzing
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Assertion: Terminal potential difference of a cell is always less than its emf.
Reason: Potential drop due to internal resistance of cell increases the terminal potential difference.
Reason: Potential drop due to internal resistance of cell increases the terminal potential difference.
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Correct option: D
If both Assertion & Reason are False
Option D (If both Assertion & Reason are False) is correct because the terminal potential difference is usually *less* than the EMF due to internal resistance, and the potential drop *decreases* the terminal potential difference.
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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