Discussion
The hygrometer is an instrument used to measure
1. rainfall 2. altitude
3. relative humidity 4. temperature Which of the following is true ?
Answer: C
Only statement 3 is true, which is option (C). A hygrometer measures relative humidity, the amount of water vapour in the air compared with the most it could hold at that temperature. Rainfall is measured by a rain gauge, altitude by an altimeter and temperature by a thermometer. So statements 1, 2 and 4 describe other instruments, which rules out (A), (B) and (D) since each of them includes at least one of these.
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