Multiple choice

For which of the following purposes is rain gauge used?

  1. To measure the amount of rainfall

  2. To measure the direction of rain

  3. To detect the presence of pollutants in rain

  4. To detect the occurrence of rain
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A Correct answer
Explanation

A rain gauge is a meteorological instrument specifically designed to measure the amount of liquid precipitation (rainfall) over a period of time. It collects and measures rainfall in millimeters or inches. It does not measure direction (that's a wind vane), detect pollutants (that requires chemical analysis), or merely detect occurrence (it measures quantity). Options B, C, and D describe functions performed by other instruments.

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