Atmosphere

Samacheer Book Back Questions And Answers For Geography Standard 9 Full Book “Atmosphere”

I. Choose The Best Answers:
1. ______is the most important gas for the survival of living organisms.
a. Helium
b. carbon-di-oxide
c. oxygen
d. methane

2. The lowest layer of the atmosphere is _____
a. Troposphere
b. Stratosphere
c. Exosphere
d. Mesosphere

3. _____ reflects radio waves.
a. Exosphere
b. Ionosphere
c. Mesosphere
d. Stratosphere

4. The average global surface temperature is _____
a. 12°c
b. 13°c
c. 14°c
d. 15°c

5. The process of change of state of water from gaseous to liquid state is called _____
a. Precipitation
b. evaporation
c. transpiration
d. condensation

6. The _____ is the chief energy source of the Earth.
a. Sun
b. Moon
c. Stars
d. Clouds

7. All types of clouds are found in the _____
a. Troposphere
b. Ionosphere
c. Mesosphere
d. Exosphere

8. _____ clouds are called ‘Sheep clouds’
a. Alto-cumulus
b. Alto-Stratus
c. Nimbo – stratus
d. Cirro-stratus

9. The Monsoons are _____
a. Prevailing winds
b. Periodic winds
c. local winds
d. none of the above

10. Dew in the form of ice crystals is called _____
a. frost
b. fog
c. mist
d. sleet.

11. _____ is called the eye of the storm/ cyclone.
a. Pressure
b. wind
c. cyclones
d. snow

12. The vertical movement of air is called
a. Wind
b. storm
c. Air current
d. drift.

II. Match the following:
1. Meteorology        A. wind speed
2. Climatology          B. direction of wind
3. Anemometer        C. cirrus
4. Wind Vane            D. study of climate
5. Mare’s Tail             E. study of weather
6. Leeward side         F. Australia
7. Willy willy              G. rain shadow region

Answers:
1. E
2. D
3. A
4. B
5. C
6. G
7. F