7/25/2019 sci 1(13)

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35. Question: Why does an electric bulb explode when it is broken?

Answer: The bulb encompasses partial vacuum and as it breaks air rushes in

causin! a small explosion.

3". Question: Why does a man #all #orward when he $umps out o# a runnin!

train or bus?

Answer: %e is in motion while in the train or bus. When he $umps out his

#eet comes to rest while touchin! the !round but his upper portion which is

still in motion propels him #orward.

3&. Question: Why does an ordinary !lass tumbler crack when very hot tea

or milk is poured in it?

Answer: When a hot li'uid is poured into a tumbler the inner layer o# the

tumbler !ets heated it expands be#ore the outer layer and an une'ual

expansion o# both layers causes the tumbler to crack.