Question

( 11. Why are there gaps between sections of rails on the railway track?
12. Why does milk in a saucepan overflow when heated?
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Answer 1

Explanation:

11) Heat | Short/Long Answer Questions

The gaps left between successive rails on a railway track, the reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. That will result in train accidents.

12) Milk overflows when boiled for the first time because it contains entrapped air. The air expands on heating and tends to escape lifting the surface of milk. Once all the air is expelled, the boiling would be regular and smooth

Answer 2

Answer:

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