1) __________ is important for burning a) Oxygen b) CO2 c) nitrogen 2) We often blow on hot potatoes to __________ them, as potatoes are __________ than our own _____________  a) hot, cooler, sight b) cool, hotter, breath c) cool, hotter, lungs 3) When you blow on a cold mirror in winters, you see _________ of water a) molecules b) drops c) atoms d) glasses e) buckets f) spoons 4) Which of these instrument is played by blowing? a) keyboard b) flute c) been d) guitar e) drum 5) Hot air is ______ and __________; cold air is ____________ and _____________. a) light, rises up, heavy, settles down b) light, settles down, heavy, rises up c) heavy, settles down, light, rises up d) heavy, rises up, light, settles down 6) A popcorn seller fans the burning coal to increase the ___________ supply  a) CO2 b) nitrogen c) oxygen 7) Our breath contains _________ which turns into drops of water on coming in contact with a cold surface a) dry air b) moisture 8) when is your heart beat fast ? a) sitting on a chair b) running

Blow hot blow cold

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