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 an instrument specifically designed to measure the amount of precipitation (rainfall) over a period. It does not measure rain direction (that would be a wind vane), detect pollutants (that requires chemical analysis), or merely detect occurrence (which is a qualitative observation - the gauge measures quantity).

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