Identify the instance when blowing air from the mouth helps to warm things up ?

Blowing over tea

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Blowing over hands after rubbing them on a snowy day

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Blowing over rubber particles after using an eraser

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Blowing over spectacles

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Solution

The correct option is B Blowing over hands after rubbing them on a snowy day
Blowing over the tea makes the tea cold.

Blowing over rubber particles after using eraser clears the dust.

Blowing over spectacles creates a fog-like thing on the spectacles.

Hence, the correct answer is blowing over hands after rubbing them on a snowy day.

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Similar questions

Q. Identify the instance when blowing air from the mouth helps to cool things up ?

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Q. Scene 1: Blowing air on hand close to mouth.
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Question 3

Figure shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?

(a) Blowing of air decreases pressure over the opening of the straw.

(b) The straw of the soft drink bottle collapses when air is blown over its open end

(d) Blowing of air increases the pressure on the surface of soft drink in the bottle.

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