Multiple choice

Insecticide spray pumps work on which of the following principles?

  1. Air expands on heating and contracts on cooling.

  2. Hot air rises upwards and cold air sinks down.

  3. Moving air exerts pressure.

  4. High speed winds are accompanied by reduced air pressure.

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Insecticide spray pumps work on this principle. When the pump is pumped, the air comes out of it at a very high speed. This, in turn, reduces the pressure over the small tube, which is dipped in the insecticide. This causes the liquid insecticide to rise up and is blown out in the form of fine spray.

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