MCQ Questions

Question No. 1

Fill in the blanks:

Answer :

1. The thick blanket of air surrounding the earth is called ......................... .

2. Plants get nitrogen with the help of bacteria in the ......................... .

3. ......................... is used for making colourful electric lights.

4. The air we breathe out is called ......................... air.

5. When there is more water vapour in the air, we say that the air is ......................... .

6. ......................... water is the purest form of water.

Question No. 2

Short Type Questions

Answer :

1. Name any four gases present in the air.

2. How does water vapour form in the atmosphere ?

3. Why should drinking water be purified ?

4. Name three processes involved in the treatment of the town water supply.

Question No. 3

Long Type Questions

Answer :

1. How is air useful to us ?

2. How is stratosphere a very important layer of atmosphere ?

3. When a burning candle is covered with a glass, it gets extinguished. Why does this happen ? What does this activity show ?

4. What are sedimentation and decantation ?

5. What is distilled water ? What are its uses ?

Question No. 4

The air has the maximum percentage of this gas.

Answer :

oxygen

carbon dioxide

nitrogen

argon

Question No. 5

This process is used for removing insoluble impurities from water.

Answer :

sedimentation

chlorination

distillation

evaporation

Question No. 6

This water is mainly used in car batteries, science experiments and in medicines

Answer :

boiled water

distilled water

tap water

sea water

Question No. 7

The air has the maximum percentage of this gas.

Answer :

oxygen

carbon dioxide

nitrogen

argon

Question No. 8

This process is used for removing insoluble impurities from water.

Answer :

sedimentation

chlorination

distillation

evaporation

Question No. 9

Impure water contains many disease-causing germs like those of

Answer :

cholera

jaundice

dysentery

all of these

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