Multiple choice

Pyrometer uses

  1. the voltage developed by the junction of two metals to measure temperature

  2. transfer of energy between adjacent parts of a body to measure temperature

  3. the principle of convection to measure temperature

  4. emitted radiation to measure temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A pyrometer measures temperature by detecting the thermal radiation emitted by an object. It works on Stefan-Boltzmann principle where emitted radiation is proportional to the fourth power of absolute temperature. Unlike contact thermometers, pyrometers enable non-contact measurement of extremely high temperatures (1000°C+), making them ideal for furnaces, molten metals, and applications where physical contact would damage the sensor. Options A, B, and C refer to thermocouples, conduction, and convection respectively, which are contact-based measurement methods.

Keep practicing — related questions