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प्रश्न
Choose the correct answer.
This per cent of the atmosphere is composed of nitrogen.
विकल्प
99
78
21
76
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उत्तर
78
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संबंधित प्रश्न
We often leave the lights switched on and fans running when we are not in the room. We switch on the air-conditioning even though we don’t really need it. We insist on being dropped to school in the car every day. Thus, we waste valuable energy which is generally produced by burning coal and petroleum. As you know, the burning of these fuels release gases that pollute the atmosphere.
Make a list of the similar things that we do without realizing that we are destroying the environment. Think of the ways that we can behave differently.
Fill in the blank
The rate at which the temperature drops in the ____________ is 1°C per 165 metres.
The upper part of the thermosphere is called the ______.
Write True or False.
CFCs and BFCs protect the ozone layer.
How is the presence of the ozone layer essential to preserve life on earth?
Why is the thermosphere important?
This is a picture of a supersonic aircraft.
In which layer of the atmosphere does this airplane normally fly?
In your notebooks, draw a diagram showing the layers of the atmosphere. Mark clearly the ozone layer, the height at which a jet plane can fly and also the height up to which birds can fly.
The lowest layer of the atmosphere is ______.
Write the significance of the following gases.
Oxygen __________________
Carbon dioxide __________________
Ozone __________________
Name the atmospheric layers.
Height of mesosphere which lies after troposphere is
Large jet planes normally fly here ______.
There is cut-off signal when NASA rocket reaches in the region of ______.
The uppermost layer of the atmosphere is ______.
Give reason:
Thermosphere is also referred to as “Heterosphere”.
______ found above the mesosphere.
What is mesosphere?
Analogy:
Weather changes: Troposphere.
Ozone layer: ______.
