Two thermometers are used to record the temperature of a room and | Filo
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Class 7

Science

Physics

Heat

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Two thermometers are used to record the temperature of a room and the bulb of one is wrapped in wet hanky.

  1. The temperature recorded by both will be same
  2. The temperature recorded by the wet-bulb thermometer will be greater than that recorded by the other
  3. The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other
  4. None of the above
Correct Answer: Option(c)
Solution: The temperature recorded by dry bulb thermometer will be greater. Due to evaporation cooling is caused which lowers the temperature of bulb wrapped in wet hanky. 
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