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Question

In a mercury thermometer, the ice point (lower fixed point) is marked as 100 and the steam point (upper fixed point) is marked as 1300. At 400C temperature, what will this thermometer read?

A
780
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B
660
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C
620
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D
580
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Solution

The correct option is C 580
Let the temperature in given scale be x.
Consider a straight line as a relation between given and celsius scale.

We get, x1013010=4001000

where, 0 and 10 are lowest fixed point for celsius and given scale and 130 and 100 are highest fixed point for given and celsius scale.

x1013010=40100

100x1000=4800

100x=5800

x=580

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