1. Question: A man with a load jumps from a high building. What will be the load
experienced by him?
Answer: Zero, because while falling, both the man and the load are falling at the same
acceleration i.e. acceleration due to gravity.
2. Question: A piece of chalk when immersed in water emits bubbles. Why?
Answer: Chalk consists of pores forming capillaries. When it is immersed in water, the water
begins to rise in the capillaries and air present there is expelled in the form of bubbles.
3. Question: Why does a liquid remain hot or cold for a long time inside a thermos flask?
Answer: The presence of air, a poor conductor of heat, between the double glass wall of a
thermos flask, keeps the liquid hot or cold inside a flask for a long time.
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