Question

Q2. Give reasons:-
a) Houses are painted white in places with hot climate.
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b) Ventilators are provided near the ceiling of a room.
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c) A laboratory thermometer is not used to measure body temperature.
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Answer 1

Answer:

1. In places of hot climate, it is advised that the outer walls of house be painted white because white colour does not absorb any heat radiation from the sun which keep inside cool even if there is hot climate outside the house.
2. In the room when air is hot its density decrease and rises up. So ventilators help to remove out hot air from the room and make its temperature same. So,ventilators are made close to the ceiling
3. A laboratory thermometer cannot be used to measure the temperature of a human body because the range of a laboratory thermometer is high generally from –10°C to 110°C, while as normal body temperature in humans is only 37°C.

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Answer 2

Answer:

a) White colour reflects most of the heat falling on it. This makes the house colder. Thus, in places of hot climate it is advised that the outer walls of house be painted white.

b)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.

c)A laboratory thermometer cannot be used to measure the human body temperature. This is because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in its tube will start falling quickly. This will give a wrong value of the body temperature

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