4. AIR
Question.1 Answer the following questions-
(a) What is atmosphere?
Answer.- The huge blanket of air surrounding the Earth is called atmosphere.
Answer.- The huge blanket of air surrounding the Earth is called atmosphere.
(b) Which two gases make the bulk of the atmosphere?
Answer.- Nirtrogen (78%) and oxygen (21%)
(c) Which gas creates greenhouse effect in the atmosphere?
Answer.- Carbon dioxide
Answer.- Weather is the hour-to-hour, day-to-day condition of the atmosphere.
Answer.- 1. Convectional rainfall 2. Orographic rainfall 3. Cyclonic rainfall
Answer.- The pressure exerted by the weight of air on the earth’s surface is known as air pressure.
(a) Carbon dioxide
(b) Nitrogen
(c) Ozone
(a) Troposphere
(b) Thermosphere
(c) Mesosphere
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(a) Increases
(b) Decreases
(c) Remains the same
(a) Cloud
(b) Rain
(c) Snow
C. (b) Stratosphere D. (b)
Decreases E. (b) Rain
Question.3 Match
the following-
Answer.-
Question.4 Give
reasons-
Answer.-
(i) Trade Winds |
(e) Permanent wind |
(ii) Loo |
(f) Local wind |
(iii) Monsoon |
(b) Seasonal wind |
(iv) Wind |
(c) Horizontal movement of air |
(a) Wet clothes take longer time to dry on a humid day?
Answer.- Humidity is the amount of moisture or water vapour present in air at any moment in time.
1. On the equator, insolation comes through vertical rays.
2. It covers up less space. Hence heat is felt more.
Answer.- it goes on coming through slanting rays. Slanting rays come on the earth passing longer distances through the atmosphere. They heat up more space. Hence there is less heat on a point of space.
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