Multiple choice

Which one of the following item cannot be used to demonstrate the presence of air?

  1. Wind mill

  2. Fan

  3. Firki

  4. Moving car
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A moving car does not directly demonstrate the presence of air in the way the other options do. Windmills and fans both work by harnessing air movement. A firki (toy pinwheel) spins when air blows through it, visibly showing air's presence. While a car experiences air resistance (drag), it doesn't demonstrate air's presence to an observer in the same direct, visual way.

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