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Question

The upper and lower fixed points of a thermometer are separated by 180 mm. What is the temperature in Celcius if the length of the mercury thread is 90 mm above the lower fixed point ?

A
90C
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B
50C
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C
45C
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D
58C
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Solution

The correct option is B 50C
The upper and lower fixed points of a thermometer are separated by 180 mm. Now the full scale is 100C. If the mercury thread is at the point X the temperature reading in the scale will be:
t=90180×100oC.
So, the reading will be 50C

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