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The ice and steam points of mercury-in-glass thermometer ...

The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is

A.

32oC

B.

48oC

C.

56oC

D.

65oC

E.

75oC

Correct answer is C

steam point - ice point in oC = 100oC - 0oC

= 1.9cm - 3cm = 16cm

12cm = 3cm = 9cm

\(\frac{9}{16}\) x 100oC = 56.25oC

= 56oC