Which of the following elements of weather is matched with the wrong measuring instrument?

Step 1: Analyze the question We need to find the pair where the weather element is matched with the wrong instrument.

Step 2: Recall the instruments

| Weather element | Correct instrument | |---|---| | Humidity | Hygrometer (or psychrometer / wet-and-dry bulb thermometer) | | Atmospheric pressure | Barometer | | Rainfall | Rain gauge | | Sunshine (duration) | Campbell-Stokes sunshine recorder (a sundial only shows time using the sun's shadow) | | Wind speed | Anemometer | | Wind direction | Wind vane | | Temperature | Thermometer (Stevenson screen) |

Step 3: Check each option

• A. Humidity and barometer. Wrong. A barometer measures atmospheric pressure, not humidity. Humidity is measured with a hygrometer.
• B. Rainfall and rain gauge. Correct.
• C. Sunshine and sundial. Not ideal. A sundial tells time from the sun's shadow, and the proper sunshine instrument is the sunshine recorder. However, among the options, it is loosely accepted as sun-related, and the examiner's clear error is option A.
• D. Windspeed and anemometer. Correct.

Step 4: Conclusion Option A is the pair that is clearly mismatched. Option C is imperfect in strict terms, but a sundial is at least associated with the sun, while a barometer has nothing to do with humidity.

Answer: A

Exam tip: Remember the "H" pairs: Humidity → Hygrometer. And Barometer → Bar (pressure, as in millibars). Whenever you see "barometer," think pressure.