Revision Test
Air Around Us
1 . The earth is surrounded by a thick layer of air which is a
mixture of several transparent gases , called the
________________ .
2. State the different layers of the atmosphere.
3. Above the layer of troposphere lies the calm and clear air :
__________________ .
4 . Define tropopause.
5 . It is a special form of oxygen , which is found in the
stratosphere . __________________
6 . Meteors burn up in this layer . ________________
7 . In the lower layer of thermosphere , ___________________
are present in concentration .
8 . How much percentage of nitrogen and oxygen occupies the
total volume in the air ?
9 . It is a life supporting gas . _____________
10 . What is the Normal Lapse rate ?
Answers
Answer:
1 . The earth is surrounded by a thick layer of air which is a
mixture of several transparent gases , called the
atmosphere
2. State the different layers of the atmosphere.
Troposphere
Stratosphere
Mesosphere
Thermosphere
Ionosphere
Exosphere
3. Above the layer of troposphere lies the calm and clear air :
Stratosphere
4 . Define tropopause.
The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere.
5 . It is a special form of oxygen , which is found in the
stratosphere . ozone
6 . Meteors burn up in this layer .Mesosphere
7 . In the lower layer of thermosphere , mesopaus
are present in concentration .
8 . How much percentage of nitrogen and oxygen occupies the
total volume in the air ?
99%
9 . It is a life supporting gas . oxygen
10 . What is the Normal Lapse rate ?
6.5 °C per kilometre
Step-by-step explanation:
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