Q.

To measure a temperature say around 400°C which of the following thermometers can be used most conveniently : 
(i) gas thermometer
(ii) mercury thermometer
(iii) platinum thermometer
(iv) thermocouple

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a

(i, iii)

b

(ii, iv)

c

(iii, iv)

d

(i, ii)

answer is D.

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Detailed Solution

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gas thermometer - small temperatures.

mercury thermometer - < 2000C

platinum thermometer 2000C to 10000C.

thermocouple thermometer -2000C to 25000C

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