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Explore · Class 7 · Science

Heat Transfer in Nature

Every "Heat Transfer in Nature" question below started as a real disagreement — two people reasoning from what they've actually seen, one of them missing a piece. See if you can catch which before you check.

Ramesh's mother says wet clothes dry faster on a windy day. Ramesh says wind doesn't add any heat, so it shouldn't make a difference. Who is right?

On a winter morning Meena touches the iron gate and the wooden door. The iron feels much colder. She says the iron is at a lower temperature than the wood. Is she right?

A fan feels cooling in summer. Meena says the fan makes the room's air colder. Her brother says the air stays just as hot — something else is being cooled. Who is right?

In winter Sunita feels warm in a sweater. She says the sweater makes heat and gives it to her body. Her friend says she does stay warm but the reason is wrong. Who is thinking correctly?

Put a spoon in hot milk and the spoon soon turns hot. Kabir says the spoon's coldness went into the milk, so the milk got colder and the spoon got hot. Is it right to say "coldness flowed from the spoon into the milk"?

A thermos keeps hot tea hot for hours. Riya says a thermos is only for hot things; putting ice or cold water in it is pointless because a thermos is a "keep-hot" device. Is Riya right?

On a hot day there are two ice cubes. One is wrapped in a woollen blanket, the other left open. Aryan says a blanket gives warmth, so the wrapped ice will melt first. Is Aryan right?

Want to know who's right, and why? Reason it out yourself — free, in Hindi, Hinglish or English.

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