Air and Water

Q1. Which of the following gases protects us from harmful sun rays?

• (a) Carbon dioxide

• (b) Nitrogen

• (c) Ozone.

Q2. The most important layer of the atmosphere is?

• (a) Troposphere

• (b)Thermosphere

• (c) Mesosphere.

Q3. Which of the following layers of the atmosphere is free from clouds?

• (a) Troposphere

• (b) Stratosphere

• (c) Mesosphere

Q4. As we go up the layers of the phere, thatmose pressure?

• (a) Increases

• (b) Decreases

• (c) Remains the same.

Q5. When precipitation comes down to the earth in the liquid form, it is called?

• (a) Cloud

• (b) Rain

• (c) Snow

Q6. (a)   is the most important layer of the atmosphere.

Q7. (a)   is the second most plentiful gas in the air.

Q8. Exosphere has very thin air, and gases like __________ and ___________ float into the space

from here.

(a)  

Q9. (a)   gas protects us from the harmful effect of the sun rays.

Q10. Westerlies and Easterlies are the examples of (a)   wind.