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Standard VII
Physics
Clinical Thermometer
Question

Two thermometers are used to record the temperature of a room and the bulb of one is wrapped in a wet hanky.
  1. The temperature recorded by both will be same
  2. The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other
  3. The temperature recorded by the wet-bulb thermometer will be greater than that recorded by the other
  4. None of the above

A
The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other
B
The temperature recorded by both will be same
C
The temperature recorded by the wet-bulb thermometer will be greater than that recorded by the other
D
None of the above
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Solution
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The temperature recorded by the dry bulb thermometer will be greater. Due to evaporation cooling is caused which lowers the temperature of the bulb wrapped in a wet hanky.

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