MCQ Questions for Class 7 Geography Chapter 4 Air with Answers
Appearing Students of Class 7 Exams can download MCQ on Air Class 7 with Answers from here. By practicing Class 7 Geography Chapter 4 MCQ with Answers, you can score well in the exam. Download Class 7 SST Geography Chapter 4 MCQ in PDF format from the below access links and start practicing on a regular basis for better subject knowledge.
Question 1.
The quantity of oxygen in the air is:
(a) 78%
(b) 21%
(c) 15%
(d) 10%
Answer
Answer: (b) 21%
Question 2.
Ozone layer is found in:
(a) Troposphere
(b) Mesosphere
(c) Thermosphere
(d) Stratosphere
Answer
Answer: (d) Stratosphere
Question 3.
Which gas creates a greenhouse effect?
(a) Nitrogen
(b) Oxygen
(c) Argon
(d) Carbon dioxide
Answer
Answer: (d) Carbon dioxide
Question 4.
Ionosphere is a part of:
(a) Troposphere
(b) Mesosphere
(c) Thermosphere
(d) Stratosphere
Answer
Answer: (c) Thermosphere
Question 5.
What was invented by Anders Celsius?
(a) Barometer
(b) Thermometer
(c) Rain gauge
(d) None of the above
Answer
Answer: (b) Thermometer
Question 6.
Which winds change their direction in different seasons?
(a) Permanent winds
(b) Seasonal winds
(c) Local winds
(d) None of the above
Answer
Answer: (b) Seasonal winds
Question 7.
Which layer is the upper most layer?
(a) Troposphere
(b) Mesosphere
(c) Thermosphere
(d) Exosphere
Answer
Answer: (d) Exosphere
Question 8.
Which gas is available most plentiful in the air?
(a) Nitrogen
(b) Oxygen
(c) Argon
(d) Carbon dioxide
Answer
Answer: (a) Nitrogen
Question 9.
Degree of hotness and coldness of the air is called:
(a) Humidity
(b) Pressure
(c) Temperature
(d) Insolation
Answer
Answer: (c) Temperature
Question 10.
Atmospheric pressure is measured by:
(a) Barometre
(b) Thermometer
(c) Rain gauge
(d) None of the above
Answer
Answer: (a) Barometre
Question 11.
Which of the following gases protects us from harmful sun rays?
(a) Carbon dioxide
(b) Nitrogen
(c) Ozone
(d) All of these
Answer
Answer: (c) Ozone
One important feature of stratosphere is that it contains a layer of ozone gas. We know that it protects us from the harmful effect of the sun rays.
Question 12.
In which direction the wind blows constantly throughout the year in particular direction?
(a) Permanent winds
(b) Local winds
(c) Seasonal winds
(d) Both (a) and (b)
Answer
Answer: (a) Permanent winds
Permanent winds is the trade winds, westerlies and easterlies are the permanent winds. These blow constantly throughout the year in a particular direction.
Question 13.
In which layers all weather phenomenon occurs?
(a) Troposphere
(b) Stratosphere
(c) Thermosphere
(d) Mesosphere
Answer
Answer: (a) Troposphere
Troposphere layer is the most important layer of the atmosphere. Its average height is 13 km. The air we breathe exists here. Almost all the weather phenomena like rainfall, fog and hailstorm occur in this layer.
Question 14.
What is the result when the air is heated?
(a) Heavier
(b) Lighter
(c) Colder
(d) Warmer
Answer
Answer: (b) Lighter
When air is heated, it expands, becomes lighter and goes up. Cold air is denser and heavy.
Question 15.
Which is the most important layer of the atmosphere?
(a) Troposphere
(b) Thermosphere
(c) Mesosphere
(d) None of these
Answer
Answer: (a) Troposphere
Troposphere layer is the most important layer of the atmosphere. Its average height is 13 km. The air we breathe exists here.
Question 16.
What is air pressure?
(a) Pressure exerted by the wind
(b) Pressure exerted by the rain
(c) Pressure exerted by the weight of air
(d) None of these
Answer
Answer: (c) Pressure exerted by the weight of air
The pressure exerted by the weight of air on the earth’s surface is known as the air pressure.
Question 17.
Name the types of rainfall?
(a) Cyclonic
(b) Orographic
(c) Convectional
(d) All of the above
Answer
Answer: (d) All of the above
Convectional rainfall, Orographic rainfall, Cyclonic rainfall are the type of rainfall.
Question 18.
What do you mean by weather?
(a) Incoming solar energy
(b) All condition of the atmosphere
(c) Both a and b
(d) None of these
Answer
Answer: (b) All condition of the atmosphere
Weather is hour-to-hour, day-to-day condition of the atmosphere.
Question 19.
How ozone layer is important to us?
(a) Protect us from weather changes
(b) Protect us from harmful rays
(c) Protect us from rain
(d) None of these
Answer
Answer: (b) Protect us from harmful rays
It protects us from the harmful effect of the sun-rays.
Question 20.
Which gases make the bulk of the atmosphere?
(a) Nitrogen
(b) Oxygen
(c) Both a and b
(d) None of these
Answer
Answer: (c) Both a and b
Nitrogen (78%) and Oxygen (21%) make the bulk of atmosphere.
Match the following
1.
| Column I | Column II |
| 1. Mesosphere | (a) 13 km. |
| 2. Thermosphere | (b) 50 km. |
| 3. Exosphere | (c) 80 km. |
| 4. Stratosphere | (d) 80-400 km. |
| 5. Troposphere | (e) Beyond 400km. |
Answer
Answer:
| Column I | Column II |
| 1. Mesosphere | (c) 80 km. |
| 2. Thermosphere | (d) 80-400 km. |
| 3. Exosphere | (e) Beyond 400km. |
| 4. Stratosphere | (b) 50 km. |
| 5. Troposphere | (a) 13 km. |
Fill in the blanks
1. The quantity of nitrogen in atmosphere is ……………. .
Answer
Answer: 78%
2. Wind vane shows the direction of the ……………. .
Answer
Answer: wind
3. In the atmosphere, percentage of oxygen is ……………. %.
Answer
Answer: 21
4. When we inhale, we take some amount of ……………. into our lungs and exhale it.
Answer
Answer: nitrogen
5. ……………. play an important role for plants to take nitrogen from air.
Answer
Answer: Bacteria
6. The increased volume of carbon dioxide is affecting the earth’s ……………. and ……………. .
Answer
Answer: weather, climate
7. ……………. layer helps in radio transmission.
Answer
Answer: Thermosphere
8. Light gases like helium and hydrogen float into the space in ……………. layer.
Answer
Answer: exosphere
9. The most important layer is ……………. .
Answer
Answer: Troposphere
10. Standard unit ‘Degrees Celsius’ for measuring temperature invented by ……………. .
Answer
Answer: Anders Celsius
Picture Based Questions
1. Draw the structure of atmosphere.
Answer
Answer:
2. Draw major pressure belts and wind system
Answer
Answer:
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