Air Class 7 Questions and Answers Geography Chapter 4
Class 7 Geography Chapter 4 NCERT Textbook Questions and Answers
Answer the following questions :
(i) What is the atmosphere?
A blanket of air surrounding the earth is called atmosphere.
(ii) Which two gases make the bulk of the atmosphere?
Nitrogen and oxygen are the two gases which make the bulk of the atmosphere.
(iii) Which gas creates green house effect in atmosphere?
Carbon dioxide creates a green house effect in the atmosphere by trapping the heat radiated from the earth.
(iv) What is weather?
The hour-to-hour, day-to-day condition of the atmosphere is called weather.
(v) Name three types of rainfall.
The three types of rainfall are“
Relief (Orographic) rainfall
(vi) What is air pressure?
The pressure exerted by the weight of the air on the earth’s surface is called air pressure.
Tick the correct answer :
(i) Which of the following gases protects us from harmful sun rays?
(a) Carbon dioxide
(ii) The most important layer of the atmosphere is-
(iii) Which of the filling layers of the atmosphere is free from clouds?
(b) Air pressure
(iv) As we go up the layers of the atmosphere, the pressure.
(c) remain the same
(v) When precipitation comes down to the earth in the liquid form, it is called
Match the following-
|(i) Trade winds||(a) Seasonal wind|
|(ii) Loo||(b) horizontal movement of air|
|(iii) Monsoon||(c) permanent wind|
|(iv) Wind||(d) local wind|
|(i) Trade winds||(c) permanent wind|
|(ii) Loo||(d) local wind|
|(iii) Monsoon||(a) Seasonal wind|
|(iv) Wind||(b) horizontal movement of air|
(a) Wet clothes take longer time to dry on a humid day?
(b) Amount of insolation decreases from equator towards the poles
(a) When the air is full of water vapour we call it a humid day. On a humid day, the capacity of the air to hold more water vapours decreases. Hence, wet clothes take longer time to dry on a humid day.
(b) The equator is near the sun than the poles. The sun rays directly fall on the equator while the sun rays are slanting towards the poles. Hence the amount of insolation decreases from the equator towards the poles.
(a) Solve this crossword puzzle with the help of given clues?
|6. An Indian tree having extraordinary quality of providing oxygen round the clock||1. Amount of water vapour in air|
|8. Gas present in atmosphere occupying only 0.03% by volume||2. Condensation of water vapours around dust particles in atmosphere|
|11. Outermost layer of atmosphere||3. Example of local wind blowing in summer in northern India|
|12. Mixture of many gases||4. Short term changes in atmosphere|
|14. Life giving gas||5. Precipitation in liquid form|
|15. Air in motion||7. Blanket of air around the earth|
|16. An Indian tree valued highly for medicinal properties||9. Instrument to measure pressure|
|18. Gas protecting us from harmful sunrays||10. Incoming solar radiation|
|19. Low pressure area||13. Reduces visibility in winters|
|17. It is time when sun is overhead|
8. Carbon dioxide
(ii) Make a weather calendar for one week. Use pictures or symbols to show different types of weather. You can use more than one symbol in a day, if the weather changes. For example, the sun comes out when rain stops. An example is given below-
NCERT Solutions for Class 7 Social Science