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NCERT · Class 5 · EVS

Chapter 15: Blow Hot Blow Cold

Practice each question, then open the answer or worked solution.

Think and tell

6 questions
Q1Written answer

Can you think of any other way in which you use the warmth from your breath?

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Worked solution

Answer: We can use the warmth of the breath for the redness of the eye or any injury by blowing it onto the handkerchief, and keeping it on the redness of the eye gives relief.

Q2Written answer

Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm?

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Worked solution

Answer: Yes, even after folding the cloth 3-4 times and by blowing the air from the mouth, the cloth results in warmth.

Q3Written answer

Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them?

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Worked solution

Answer: If Balishtiye had eaten the hot potatoes without cooling them, then it would have caused burns in his mouth.

Q4Written answer

Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot?

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Worked solution

Answer: Yes, while sipping hot tea, I burnt my tongue. I sometimes use a fan to cool my food or otherwise, by blowing over it, I cool it.

Q5Written answer

If you were to cool these three hot things – dal, roti, rice – in which ways would you do so?

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Worked solution

Answer: To cool down these items, first, we should keep them in a wider container and keep them under a fan, or if they are in less quantity, we can blow over them and cool them.

Q6Written answer

For what other things do you blow air from your mouth?

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Worked solution

Answer: We blow air from our mouths to clean spectacles, whistle, clean any dust particles, blow the flute, etc.