Question

GEOGRAPHYWORKSHEET

CLASS VII Chapter 4 (AIR)



I. Choose the correct answer.

1. Our atmosphere is divided into ________________ layers.

(a) 5 (b) 4 (c) 8

2. _____________________ measures the temperature.

(a) Barometre (b) Thermometer (c) Rain Gauge

3. In _________________ temperature rises, very rapidly with increasing height.

(a) Thermosphere (b) Troposphere (c) Stratosphere

4. Green plants produce __________________ during photosynthesis.

(a) Nitrogen (b) Carbondioxide (c) Oxygen

5. The uppermost layer of the atmosphere is known as ________________.

(a) Stratosphere (b) Exosphere (c) Troposphere

6. _________________ is the second most plentiful gas in the air.

(a) Nitrogen (b) Oxygen (c) Carbondioxide

7. Almost all the weather phenomena like rainfall, fog and hailstorm occur in ________

(a) Stratosphere (b) Troposphere (c) Exosphere

8. _________________ helps in radio transmission.

(a) Troposphere (b) Exosphere (c) Thermosphere

9. Mesosphere the third layer of the atmosphere extends up to the height of ______ km

(a) 80 (b) 50 (c) 100

II. Fill in the blanks

1. Cold air is denser and _________________. That is why it tends to sink down.

2. _____________, ______________, _______________, _______________,______________ are the five layers of atmosphere.

3. On the Celsius scale the water freezes at ____________ and boils at _____________.

4. ________________ need nitrogen for their survival.

5. Radio waves transmitted from the earth are reflected back to the earth by __________________.

6. _____________________ measures atmospheric pressure.

7. Plants use _______________ to make their food and release _____________.

8. Low pressure is associated with cloudy skies and ______________ weather.

9. A wind is named after the direction from which it glows, example the wind blowing fromthe west is called ________________.

10. In areas where temperature is high the air gets heated and rises. This creates a______________ area.

11. The rise in temperature causes the snow in coldest part of the world to melt. As aresult the sea level _______________, causing _______________ in the coastal areas.

12. Stratosphere extends up to a height of ____________ km.

13. The increased volume of carbondioxide is affecting the earth’s ________ and climate.

14. _____________ and ______________ are two gases which make up the bulk of theatmosphere.

15. The standard unit of measuring temperature is degree Celsius. It was invented by_____________.

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Answer 1

Answer:

question no.1=b

question no. 2=a

question no.3=c

question no. 4=c

question no. 7=sun light,oxygen

Answer 2

Answer:

1.) 5

2.) Thermometer

3.)