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Q.

Thermometers which are not kept in touch with the body to measure temperatures are 

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a

pyrometers 

b

thermocouples

c

gas thermometers

d

platinum resistance thermometers

answer is A.

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Detailed Solution

A pyrometer or infrared thermometer is a device for non-contact temperature measurement. The pyrometer rests in terms of physics on the evaluation of electromagnetic radiation radiated from the object to be measured, proportional to the object temperature.

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