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Q.

Is it true that the shining thread in a thermometer is a column of mercury?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
A clinical thermometer consists of a long, narrow and uniform glass tube. It has a bulb at one end which contains mercury. When the thermometer is placed in our mouth, the mercury in the bulb gets heated and rises in the tube due to expansion. That column of mercury in the tube looks like a shining thread.
 
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