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

Options

A. Statement-1 is true, Statement-2: is true, Statement-2 is a correct explanation for Statement-1.
B. Statement-1 is true, Statement-2: is true, Statement-2 is NOT a correct explanation for Statement-1.
C. Statement-1 is true but statement-2 is false
D. Statement-1 is false, Statement-2 is true

Answer

D

Explanation

`Rl_(2)=l_(1)X rArr (l_(2)R)/(l_(1))`
To keep same null point, means `l_(1)` and `l_(2)` are same. As temperature increases value of unknown resistance increases. To get same null point, R must be increased so statement1 is wrong
Statement-2 is true.