IIT-JEE 2008 · Paper 1 · Physics Q34

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PhysicsAssertion and reason+3 / -1Question 34 of 69

STATEMENT-1: In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.

and

STATEMENT-2: Resistance of a metal increases with increase in temperature.

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Answer and worked solution

Official answer: D

Statement 2. The resistance of a metal increases with temperature. True.

Statement 1. At balance $\dfrac XS=\dfrac l{100-l}$ . If X increases, keeping the same null point needs S to increase in the same ratio, not decrease. False.

(D)

Topics:Wheatstone bridge and metre bridge Temperature dependence of resistance

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IIT-JEE 2008 · Paper 1, Physics question 34