NCERT Class 7 Geography Chapter 4 Air Extra Questions and Answers
Class 7 Geography Chapter 4 Extra Questions and Answers – Air. Here in this Page Class VII Students can Learn Extra Questions & Answer 4th Chapter Geography fully Inside.
We Provided Here Air Geography Chapter 4 Long Answer Type Question, MCQ Questions & Answer, Short Answer Type Questions (2 or 3 marks), and Very Short answer Type Question (1 marks).
Class 7 Geography Chapter 4 Extra Question with Answer – Air
Geography Chapter 4 Air Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
MCQ Type Extra Questions
(1) Which type of rainfall is occurred due to the presence of hill or a mountain in the path the winds ?
(a) Convectional Rainfall
(b) Cyclone rain
(c) Releif rain
(d) none of the above
Abs:- (c) Releif rain
(2) Which of these is not a permanent wind
(a) Westerlies
(b) polar winds
(c) Trade winds
(d) Monsoon winds
Ans:- (d) Monsoon winds
(3) The standard unit of measuring temperature is
(a) degree Celsius
(b) degree Copernicus
(c) Centimetres
(d) none of the above
Ans:- (a) degree Celsius
(3) The incoming energy intercepted by the earth is termed as:
(a) Solar energy
(b) Sun rays
(c) Radiation
(d) Insolation
Ans:- (d) Insolation
(4) The hot and dry local wind northern planes of India
(a) Land breeze
(b) Hot breeze
(c) Loo
(d) Monsoon
Ans:- (c) Loo
(5) Identify the gas known as green house gas.
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Argon
Ans:- (c) Carbon dioxide
(6) A monsoon wind is a ______
(i) Permanent wind
(ii) seasonal wind
(iii) local wind.
(iv) Easterlies
Ans – (ii) Seasonal wind
(7) Choose the state which is prone to cyclones that originate in the Bay of Bengal and is located on the eastern seacoast of India.
(a) Kerala
(b) Odisha
(c) Tamil Nadu
(d) Andhra Pradesh
Ans:- (b) Odisha
(8) What is the standard unit of measuring temperature?
(a) Degree Celsius
(b) Watt
(c) Joules
(d) Calorie
Ans:- (a) Degree Celsius
(9) The air pressure in the ocean surface is________
(i) Lowest
(ii) Medium
(iii) Highest
(iv) not present
Ans – (ii) Medium
Very Short Answer Type Extra Questions
(1) What is the significance of ozone in the atmosphere?
Solution:
One important feature of stratosphere is that it contains a layer of ozone gas it protects us from the harmful effect of the sun rays.
(2) How does carbon dioxide create a greenhouse effect on earth ?
Solution:
Carbon dioxide released in the atmosphere create a green house effect by trapping the jeart radiated from the earth.
In case you are missed :- Previous Chapter Extra Questions
(3) How do plants make use of nitrogen?
Solution:
Plants need nitrogen for their survival. They cannot take Bacteria. That live in the soil and roots of some plants, take nitrogen from the air and changes its form so that plants can use it
(4) Discuss how air circulation takes place.
Solution:
When hot air rises from surrounding area rushes there to fill in the gap. That is how air circulation takes place.
(5) Define Mesosphere.
Solution:
This is the third layer of the atmosphere. It lies above the stratosphere. It extends up to the height of 80 km. Meteorites burn in this layer on entering from the space.
(6) Define loo.
Solution:
The hot and dry local wind of northern planes of India is called loo.
(7) What is rain ?
Solution:
Precipitation comes down to the earth in liquid form is called rain
(8) Name two type of rainfall.
Solution:
(Any two)
Convection Rainfall
Relief (Orographic) Rainfall
Convection Rainfall
(9) Which is the topmost of the atmosphere ?
Solution:
Exosphere is the topmost layer of the atmosphere
10.) What is the amount of nitrogen present in atmosphere?
Ans: The amount of Nitrogen present in the atmosphere is 78%
(11) Which gas absorbs and trap heat in the air ?
Solution:
Carbon dioxide gas absorbs and trap heat in the air
12.) What is the unit of temperature?
Ans: The standard unit of measuring temperature is degree Celsius.
(13) What is the total percentage of oxygen in the air ?
Solution:
The total percentage of oxygen in the air is nearly 21%
14.) Which instrument is used to measure air pressure?
Ans: Barometre is used to measure air pressure
(15) Which gas has the maximum proportion in air ?
Solution:
Nitrogen gas has the maximum proportion in air.
16.) Which gas is present in bulk amount in the air?
Ans: Nitrogen is present in bulk amount in the air.
Short Answer Type Extra Questions
(1) Explain does the density of air decrease with the increase in height?
Solution:
The air pressure is height at sea level and decrease with height. As we go up the layers of the atmosphere, the pressure falls rapidly. This is because the effect of gravity reduce and the air becomes thinner in the upper layers with heavier gases concentrating in the lower layers.
(2) Horizontally the distribution air pressure is influenced by temperature by of a place. Explain.
Solution:
Horizontally the distribution of air pressure is influenced by temperature of air at a given place. In areas temperature is high the air gets heated and rises, this creates a low- pressure area. In areas having lower temperature, the air is cold. It is therefore heavy. Heavy air skin and creates a high pressure area.
(3) Write an account of composition of atmosphere.
Solution:
Nitrogen and oxygen are two gases which up the bulk of the atmosphere. Carbon dioxide , helium, ozone, argon and hydrogen are found in lesser quantities. Apart from the gases, tiny dust articles are also present in the air. The pie chart gives you the percentage of different constituents of air.
(4) Explain why astronauts have to wear special protective space suits when they go to the moon.
Solution:
Astronauts have wear special protective space suits filled with air when they go to the moon. If they did wear these space suits, counter pressure entered by the body of the astronaut would make the blood vessels burst. The astronauts would bleed.
(5) Explain the three major types of winds.
Solution:
Winds cam be broadly divided into three types.
Permanent winds:
The trade winds, westerlies and easterlies are the permanent winds. These blow constantly throughout the year in a particular direction.
Seasonal winds :
These winds changes their direction in different seasons. For example monsoons in India.
Local Winds :
These blow only during a particular period of the day or year in a small area. For example, alnd and sea breeze.
(6) We see a white trail behind jet planes flying in the sky. Explain the reasons for same.
Solution:
Jet planes flying in the sky leave a white trail behind them. The moisture from their engines condenses. We see trails of this condensed moisture for some time when there is no air movement to disturb it.
Long answer Type Extra Questions
(3) Differentiate between weather and climate
Solution:
Weather – Condition of the atmosphere at a particular place over a short period of time. 2. It changes day today, hour to hour or even in minutes. It affects our day to day life. Climate – Condition of atmosphere that prevail over a long period, say 30 years. It remains same for period of time. It affects the lifestyle of people.
(4) Discuss how carbon dioxide is responsible for global warming.
Solution:
The amount of carbon dioxide released by human or animals seems to be equal to the amount used by the plants which make a perfect balance. However, the balance is upset by burning of fuels, such as coal and oil. Hey add billions of tons of carbon dioxide into the atmosphere each year, as a result, the increased volume of carbon dioxide is affecting the earth’s weather and climate.
Source: Diksha
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