Transmission Of Heat Question 55

Question: The quantity of heat which crosses unit area of a metal plate during conduction depends upon

[MP PMT 1992; JIPMER 1997]

Options:

A) The density of the metal

B) The temperature gradient perpendicular to the area

C) The temperature to which the metal is heated

D) The area of the metal plate

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Answer:

Correct Answer: B

Solution:

$ \frac{dQ}{dt}=KA\frac{d\theta }{dl} $

Therefore $ \frac{dQ}{dt}\propto \frac{d\theta }{dl} $ (Temperature gradient)