Class 7 Exam > Class 7 Notes > NCERT Solutions - Chapter 4 - Air, Class 7, Geography
Chapter 4 - Air, Class 7, Geography NCERT Solutions PDF Download
Solutions of Ncert Textbook Exercise Questions
Q.1: Answer the following questions -
(i) What is Atmosphere?
(ii) Which two gases make the bulk of atmosphere?
(iii) Which gas creates Green House effect in atmosphere?
(iv) What is Weather?
(v) Name three types of Rainfall.
(vi) What is Air Pressure?
Ans:
(i) Atmosphere is the blanket of air which surrounds the earth from all sides.
(ii) Two gases which make the bulk of atmosphere are nitrogen and oxygen.
(iii) Carbon dioxide creates Green House effect in atmosphere.
(iv) ‘Weather’ is the sum total of the atmospheric conditions of a specific place at a specific time regarding the temperature, humidity, air pressure, clouds, winds etc.
(v) The three types of rainfall are - Conventional rainfall, Orographic rainfall and Cyclonic or Frontal rainfall.
(vi) Air has weight and so, exerts pressure. Hence, air pressure is the impact which occurs due to air weight.
Q.2: Tick the correct answer -
(i) Which of the following gases protects us from harmful sun rays?
a. Carbon Dioxide
b. Nitrogen
c. Ozone
(ii) The most important layer of atmosphere is
a. Troposphere
b. Thermosphere
c. Mesosphere
(iii) Which of the following layers of atmosphere is free from clouds?
a. Troposphere
b. Stratosphere
c. Mesosphere
(iv) As we go up the layer of the atmosphere, the pressure
a. Increases
b. Decreases
c. Remains same.
(v) When precipitation comes down to the earth in the liquid form, it is called -
a. Cloud
b. Rain
c. Snow.
Ans: (i) c. (ii) a. (iii) b. (iv) b. (v) b.
Q.3: Match the following -
|
(i) Trade winds
(ii) Loo
(iii) Monsoon
(iv) Wind
|
(a) Seasonal wind
(b) Horizontal movement of air
(c) Permanent wind
(d) Local wind
|
Ans: (i) c. (ii) d. (iii) a. (iv) b.
Q.4: Give reasons -
(i) Wet clothes take longer time to dry on a humid day.
(ii) Amount of insolation decreases from equator towards poles.
Ans:
(i) On a humid day evaporation takes place at a much slower rate than a dry day. Therefore, evaporation from
a wet cloth is also slow. Hence, wet clothes take longer time to dry on a humid day.
(ii) On equator insolation comes through vertical rays. Due to the vertical path it reacts upon less space and hence, felt more intensive on equator. From equator towards poles insolation comes through slanting rays. These slanting rays come on earth passing longer distance through atmosphere. More heat is consumed in the space and atmosphere. It is because of these reasons that the amount of insolation decreases from equator towards poles.
FAQs on Chapter 4 - Air, Class 7, Geography NCERT Solutions
| 1. What is Air Pollution? |  |
Ans. Air Pollution is the presence of harmful substances in the air that we breathe. These substances can be gases, liquids, or solids that can pollute the air and cause harm to living organisms. Air pollution can be caused by natural or human activities.
| 2. What are the causes of Air Pollution? | |
Ans. Air pollution can be caused by both natural and human activities. The natural causes include volcanic eruptions, wildfires, and dust storms. The human activities that contribute to air pollution include the burning of fossil fuels, industrial activities, transportation, and deforestation.
| 3. What are the effects of Air Pollution on human health? | |
Ans. Air pollution can have a severe impact on human health. It can cause respiratory problems, such as asthma, bronchitis, and lung cancer. Air pollution can also cause heart diseases, stroke, and other illnesses. Prolonged exposure to air pollution can lead to premature death.
| 4. How can we reduce Air Pollution? | |
Ans. There are many ways to reduce air pollution. Some of the most effective ways include using public transportation, walking or cycling instead of driving, using energy-efficient appliances, reducing waste, planting trees, and using renewable sources of energy, such as solar or wind power.
| 5. What is the role of the government in controlling Air Pollution? | |
Ans. The government plays a crucial role in controlling air pollution. It can set regulations and standards for industries and transportation to reduce emissions. The government can also promote the use of clean energy and encourage people to adopt eco-friendly practices. The government can also impose penalties and fines on those who violate the rules and regulations related to air pollution.
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