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39. Which of the following instruments is not used for the purpose stated for it?

A. Thermometer is used to measure the degree of hotness of a body.
B. Spring balance is used to measure the mass of a body.
C. Vernier calipers are used to measure the internal and external diameters of cylindrical objects.
D. Micrometer screw gauge is used to measure small diameters.



Answer :

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Final answer:

Spring balance measures mass, while thermometer measures hotness.


Explanation:

Spring balance is used to measure the mass of a body. Vernier calipers measure internal and external diameters. Thermometer measures hotness, not mass.


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