Question

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Answer 1

Answer:

8) No we can't boil water in paper cup as paper is not a metallic substance if we'll add water to it then it will absorb water became soggy. It will not hold water so far.

9) Ventilators are provided near ceilings in the rooms of our houses because the air we breathe out is warm and rises out of the room through the ventilators. Cool fresh air rushes into the room through the doors and windows.

Explanation:

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Answer 2

8. we can boil water in a paper cup on a spirit lamp . It is because a part of the heat energy,supplied to the paper cup , passes on to water . As a resut , the ignition temperature of paper is not achieved and it does not catch fire

9.Ventilators are provided in the roomsat the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through theseventilators and thus cool air remains at bottom. ... Thus ventilators maintain conventional currents to keep the air fresh in the room.

Explanation:

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