Multiple choice

Which of the following is not a measuring instrument?

  1. Barometer

  2. Thermometer

  3. Picometer

  4. Hygrometer

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A picometer is a unit of length equal to 10⁻¹² meters, not a measuring instrument. The other options, barometer (atmospheric pressure), thermometer (temperature), and hygrometer (humidity), are all actual devices used to measure physical properties.