Question

Of the following instruments, which instruments is most suitable for measuring a temperature of ${400}^o$C?

• A. Mercury thermometer
• B. Alcohol thermometer
• C. Radiation thermometer
• D. Thermo-couple thermometer

Answer 1

Answer: (C)

Radiation thermometer

A radiation thermometer can measure higher temperatures more than ${400}^{\circ }C.$ A higher temperature body emits thermal radiation and this is detected by the radiation thermometer.

Instruments that can measure temperatures higher than ${1000}^{\circ }C$ are called pyrometers.