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Solved CBSE Class 7 Geography Chapter 4 Assertion and Reason Questions – Air. Here we (Net Explanations) working very hard to providing you with the Important Assertion Reason Questions for this Chapter.
Assertion and Reason Questions – Class 7 geography Chapter 4 Air
Q.1 : There are two statements given below, marked as Assertions (A) and Reasons (R) . Read the statements and choose the correct option.
- Assertion (A): Atmosphere is the blanket of air that surrounds the Earth and protects us from the harmful rays of the sun.
- Reason (R) : The atmosphere traps all the heat and does not allow a single ray of sunlight to enter the Earth’s surface.
a.) Only R is correct
b.) Both are correct and R is the explanation of A
c.) Only A is correct
d.) Both are incorrect.
Answer: Only A is correct.
- Assertion (A): The air we breathe only contains oxygen because we all living beings need oxygen to survive.
- Reason (R) : Oxygen is the most plentiful gas present in the air we breathe because it is required by all living beings.
a.) Both are correct and R is the explanation of A
b.) Only A is correct
c.) Both are incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Both are incorrect.
- Assertion (A): The air we breathe is a mixture of two gasses- nitrogen and oxygen.
- Reason (R) : Oxygen is the most plentiful gas as its composition is 78% in the air.
a.) Only A is correct
b.) R is the correct explanation of A
c.) Both are incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Only A is correct.
- Assertion (A): Green plants produce oxygen during the process of photosynthesis and these oxygen is taken by humans to inhale.
- Reason (R) : Carbon Dioxide exhaled by humans is taken by plants for their survival and this is how balance is maintained in nature.
a.) Only R is correct
b.) Both are correct and R is the explanation of A
c.) Both are incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): Carbon Dioxide is produced in billions of tons by burning fuels like coal and oil.
- Reason (R) : Increased volume of carbon dioxide in the atmosphere affects the weather and climate of the Earth.
a.) Only A is correct
b.) Both are correct and R is the explanation of A.
c.) Only R is correct
d.) Both are incorrect.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): Troposphere is the most important layer as the air we breathe in exists here.
- Reason (R) : The ozone layer which protects us from the harmful ultraviolet rays of the Sun exists here.
a.) Both are correct and R clearly explains A.
b.) Only A is correct
c.) Both are correct but R is not the explanation of A.
d.) Only R is correct.
Answer: Only A is correct.
- Assertion (A): Stratosphere is the layer which is best suitable for flying airplanes.
- Reason (R) : The average height of the stratosphere is 13 km.
a.) Both are correct and R is the explanation of A.
b.) Only R is correct
c.) Only A is correct
d.) R is not the explanation of A.
Answer: Only A is correct.
- Assertion (A): All the weather conditions like rainfall, fog and hailstorm occur in the stratosphere.
- Reason (R) : Mesosphere is the third layer where the meteors burn up entering into space.
a.) Both are incorrect
b.) R is the correct explanation of A.
c.) Only R is correct
d.) Both are correct but R is not the explanation of A.
Answer: Only R is correct.
- Assertion (A) : The uppermost layer of the atmosphere is the Exosphere which has very thin air.
- Reason (R) : Helium and hydrogen are the gasses which float into space from the Exosphere.
a.) Both are correct and R is the explanation of A.
b.) Both are incorrect
c.) Only R is correct
d.) Only A is correct.
Answer: Both are correct and R is the explanation of A.
- Assertion (A) : Weather is the day to day changing condition of the atmosphere. It is something which fiddles with its control knobs.
- Reason (R) : The average weather condition of a place for a longer period of time is called weather.
a.) Only A is correct
b.) Both are correct and R is the correct explanation of A.
c.) Only R is correct.
d.) Both are incorrect.
Answer: Both are correct and R is the correct explanation of A.
- Assertion (A) : The degree of hotness or coldness in the air is the temperature.
- Reason (R) : The temperature of the Earth only changes from day to night.
a.) Only A is correct
b.) Both are correct and R is the explanation of A.
c.) Only R is correct.
d.) Both are incorrect.
Answer: Only A is correct.
- Assertion (A) : Insolation is the important factor which determines the temperature in the air.
- Reason (R) : The amount of insolation decreases from the equator towards the poles and this is the reason that poles are always covered with snow.
a.) Only A is correct.
b.) Both are correct and R is the explanation of A.
c.) Both are incorrect
d.) Only R is correct.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): Air pressure is the pressure exerted by the air on our body. The force of the pressure is very great but we cannot feel it because air presses us from all directions.
- Reason (R) : Air pressure is the lowest at the sea level and air always moves from lower pressure areas to higher pressure areas.
a.) Only A is correct
b.) Both are correct but R is not the explanation of A.
c.) Both are incorrect
d.) Only R is correct.
Answer: Only A is correct.
- Assertion (A): The areas where temperature is high, the air gets heated and rises up whereas the areas where the temperature is low the air is cold and heavy.
- Reason (R) : High pressure is associated with clear and sunny skies whereas low temperature is associated with cloudy skies and wet weather.
a.) Both are correct and R is the explanation of A.
b.) Only R is correct
c.) Both are incorrect
d.) Only A is correct.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): The movement of air from high to low pressure areas is called wind.)
- Reason (R) : Wind is very light and it is very hard to even feel or see it.
a.) Both are correct but R is not the explanation of A.
b.) Only R is correct
c.) Both are correct and R is the explanation of A.
d.) Only A is correct.
Answer: Only A is correct.
- Assertion (A): Winds which blow constantly throughout the year in a particular direction are called Permanent winds.
- Reason (R) : Hot and dry local winds of northern plains are examples of permanent winds .
a.) Both are correct and R is the explanation of A.
b.) Only A is correct
c.) Both are incorrect
d.) Both are correct but R is not the explanation of A.
Answer: Only A is correct.
- Assertion (A): The amount of water vapour present in the air is called Humidity. As the air gets warmer the capacity to hold water vapour increases making it more humid.)
- Reason (R) : It is because of the humid weather that clothes dry up easily and the atmosphere becomes comfortable.
a.) Only A is correct and R is not the explanation of A.
b.) Both are incorrect
c.) Only R is correct
d.) Both are correct and R is the explanation of A.
Answer: Only A is correct and R is not the explanation of A.
- Assertion (A): Seasonal winds are the winds which blow only during a particular season.
- Reason (R) : Examples of seasonal winds are the monsoon winds or the dry and hot winds which are also called loo.
a.) Both are correct and R is the explanation of A.
b.) Only R is correct
c.) Both are correct
d.) Both are correct but R is not the explanation of A.
Answer: Both are correct and R is the explanation of A.
- Assertion (A): The precipitation which comes down on the Earth in the form of water is called rainfall and most of the underground water comes in the form of rainwater.
- Reason (R) : The water which evaporates from the water bodies forms clouds which eventually comes down in the form of rain. This process is known as the water cycle.
a.) Only R is correct
b.) Both are correct and R clearly explains A.
c.) Both are incorrect
d.) Only A is correct.
Answer: Both are correct and R clearly explains A.
- Assertion (A) : Rainfall is very essential for the survival of animals and plants and it is because of the water cycle that the balance of water is maintained on the Earth.
- Reason (R) : Rainfall should not be too much or too less because less rainfall will cause drought and more rainfall will cause flood.)
a.) Both are correct.
b.) Only R is correct
c.) Only A is correct
d.) Both are incorrect.
Answer: Both are correct.
Also See: Our Changing Earth Chapter Assertion Reason Questions