Q.

The resistance of a resistance thermometer has values  2.7Ω and  3.7Ω at 00C and 1000C respectively. The temperature at which the resistance is 3.1Ω  is

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a

300C

b

400C

c

600C

d

700C

answer is B.

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Detailed Solution

Rt, R0,  R100, are resistances of wire at t0C,00C,1000C then temperature is t=Rt−R0R100−R0×100 substitute the given values in above equation t=3.1−2.73.7−2.7×100 ⇒t=0.41×100 ⇒t=400C
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