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. _______________ is the most important layer of the atmosphere.

Q7. _______________ 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.

Q9. _______________ gas protects us from the harmful effect of the sun rays.

Q10. Westerlies and Easterlies are the examples of ____________ wind.