Multiple choice

Why are there long chimneys in the factories?

  1. So that they can be seen from far.

  2. So that no one can see the smoke coming out of them.

  3. Because of the huge fires inside the factories there is a lot of smoke.

  4. So that they take the harmful smoke and gases away from humans.

  5. Because of the heat generated from the big fires
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, the burning of fuel also produces smoke. Smoke contains a few gases and fine dust particles and is often harmful. The long chimneys take the harmful smoke and gases away from us.

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