A. bi-metallic strip thermometer
B. thermocouple
C. platinum resistance thermometer
D. optical pyrometer

Correct Answer:

Option D – optical pyrometer

Explanation

A pyrometer is an instrument for measuring high temperatures.
The optical pyrometer is one in which the luminous radiation from the hot body is compared with that from a known source.

SEE ALSO  An object of volume 400cm³ and 2.5gcm‾³ is suspended from a spring balance with half its volume immersed in water. Determine the reading on the spring balance. (Density of water = 1gcm‾³)

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