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| Q. |
Which of the following instruments is used to measure humidity? |
| A. | Kata Thermometer |
| B. | Anemometer |
| C. | Sling Psychrometer |
| D. | Clinical Thermometer |
| Answer» C. Sling Psychrometer | |
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Explanation: A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors. |
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