Which of the following options will fit best in the blank?
A barometer is to atmospheric pressure as a rain gauge is to __________.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Rainfall
The pair links an instrument with what it measures. A barometer measures atmospheric pressure, and a rain gauge measures the amount of rainfall at a place.
Why the other options are incorrect
Option (1) Humidity — Incorrect. Humidity is measured with a hygrometer.
Option (2) Wind direction — Incorrect. Wind direction is shown by a wind vane.
Option (3) Clouds — Incorrect. A rain gauge collects rain; it does not measure clouds.