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INTERNATIONAL INDIAN SCHOOL, JEDDAH – 2010-11
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 __________________.
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