Air Around Us Worksheet

Objective Type Questions

1. Match the uses in Column A with air components in column B:
   

   	(Column A)		(Column B)
   i	Mountaineers	a	Dust particles
   ii	Plant inhales during photosynthesis	b	Nitrogen
   iii	Does not support combustion	c	Oxygen cylinders
   iv	Fine hair inside nose	d	Smoke
   v	Chimney in factories	e	Carbon dioxide

2. State whether the following statements are true or false. In case of false statement, write the correct one.
   (i) Oxygen returns to atmosphere by the process of respiration in plants.
   (a) True
   (b) False
   (ii) Aeroplanes can fly without the presence of air.
   (a) True
   (b) False
   
   
3. Name the following:
   (a) Air in motion.
   (b) Supports for burning and essential for living organisms.
   
   
4. Find the odd one out:
   • Carbon dioxide,
   • Nitrogen,
   • Pollen grains,
   • Oxygen.
   
   
5. Solve the following crossword based on “Methods of Separation of Mixtures”:
   Down:
   (a) A structure that has parts which are turned around by the wind and that is used to produce power, pump water, etc.
   (b) Component of air necessary for water cycle
   (c) These living creatures use oxygen dissolved in water
   (d)  Used in photosynthesis
   
   Across:
   (b) A weather vane often in the figure of a cock mounted so as to turn freely with the wind and show its direction.
   (e) A chemical that is found in the air that has no color, taste, or smell, and that is necessary for life.
   (f) The gas surrounding the earth.
   (g) Makes up a large part of the atmosphere.
   
   
   Multiple Choice Questions
   
   
6. Determine which of the following does not necessitate the use of wind.
   (a) 
   
   (b)
   
   (c)
   
   (d)
   
   
   
7. Manjiri created the following diagrams for a science fair. What should she substitute for A, B, C, and D?
   
   
   

   	A	B	C	D
   (a)	Carbon dioxide	Oxygen	Oxygen	Carbon dioxide
   (b)	Oxygen	Carbon dioxide	Carbon dioxide	Oxygen
   (c)	Oxygen	Carbon dioxide	Oxygen	Carbon dioxide
   (d)	Carbon dioxide	Oxygen	Carbon dioxide	Oxygen

8. Which of the following activities can be done without the presence of air.
   (a) Winnowing
   (b) Threshing
   (c) Photosynthesis
   (d) Respiration
   
   
9. When Neelam returned after two days, the soil in the plant pots had dried entirely and formed a lump. When she poured some water, bubbles sprang from the soil, and the water began to go down the dirt lump, causing the soil to become loose and, eventually, wet. Which of the experiment's findings demonstrates the existence of air in the soil?
   (a) The water seeped into the lump.
   (b) The soil got wet
   (c) The soil became loose
   (d) Appearance of bubbles
   
   
10. Granthali was carefully listening to all of the instructions given by the flight attendant while travelling by Air India for the first time with her parents. When the flight attendant mentioned the masks dropping down in case of an emergency to aid the breathing process, she inquired to her parents about what comes through those masks. Can you figure out what it must be?
    
    (a) Water
    (b) Oxygen
    (c) Candies
    (d) Tissue paper
    
    Case Study/ Paragraph based Questions
    
    
11. Read the passage and answer the following questions: 
    As expected, Archie was fired up but a little nervous about the dive. With a quick, comprehensive briefing, her dive instructor, Mridul calmed her down and after “trimming” her buoyancy belt and oxygen cylinder, Archie was ready for her FIRST dive!! The dive lasted forty five minutes and she dove down to a depth of 6 feet. She could see beautiful plants, corals, and colorful fishes all around her. She could see bubbles coming out from her mouth. She returned to the boat totally exhilarated, full of tales of the underwater sea life she had seen. 
    
    (a) Can you guess what the bubbles from Archie’s mouth must be made of?
    (b) Archie was fascinated by the aquatic flora and colorful fishes and was intrigued as to how they survived without breathing. Can you explain?
    (c) Can you guess what must be there inside bouncy belt and which of the following property can be explained with it?
    
    A. Water, light water help to swim and float in deep sea
    B. Alcohol, alcohol which is lighter than water so help to float in deep sea
    C. Air, the air is filled in the empty belt occupies space in the belt and help to float in deep sea since it is lighter than water
    D. Stones, stones helps to go deep down in the sea due to their heaviness
    
    Subjective Questions
    
    
12. Aaditya went to the officials to gather mountaineering needs such as headwear, footware, ice axe, technical clothes, and cylinder; etc., for his adventurous mountaineering on the Himalayan Mountains with his younger brother Jayesh. Jayesh was taken aback and concerned when he saw the massive cylinder and asked Aaditya why he was carrying such a hefty load with him to prepare supper when he had only seen LPG cylinders at home. Can you dispel Jayesh's scepticism?
    
    
    
13. Comment: Air is a mixture.
    
    
14. Jack and Jill went to nearby river with their teacher to get a pail of water.  They took tumbler along with them. But Jack was unable to fill water in the tumbler. He put the tumbler in the well as shown below. 
    
    What must be wrong with Jack’s method of filling water in the tumbler? Can you explain how to fix it and which property is discussed here?
    
    
15. Vivek went to deep forest as a part of an expedition. He saw a beam of light sparkling in the middle of a canopy. What that must be?
    
    
    
16. On a beautiful winter morning, Geeta’s foot got wet while walking on the grass in the backyard of her native place. She was amazed to see that the grass was wet without water showering and went running to her Dadi to clear her doubt. What it indicates?
    
    
    Assertion Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
    
    
17. Assertion (A): Windmills are used to draw water from tube wells.
    Reason (R): Windmills get rotated by the use of electricity.
    
    
18. Assertion (A): Oxygen is refilled into the atmosphere from the universe.
    Reason (R): Oxygen of the atmosphere does not get used up since a large number of organisms are consuming it.
    
    
19. Assertion (A): Earthworms come out of the soil during heavy rains.
    Reason (R):  Water fills up the spaces in the soil occupied by air.
    
    
20. Assertion (A): Tyres are filled with air
    Reason (R): Air is found everywhere.

Objective Type Questions

1. Match the uses in Column A with air components in column B:
   

   	(Column A)		(Column B)
   i	Mountaineers	a	Dust particles
   ii	Plant inhales during photosynthesis	b	Nitrogen
   iii	Does not support combustion	c	Oxygen cylinders
   iv	Fine hair inside nose	d	Smoke
   v	Chimney in factories	e	Carbon dioxide

   
   Solution:
   

   	(Column A)		(Column B)
   i	Mountaineers	c	Oxygen cylinders
   ii	Plant inhales during photosynthesis	e	Carbon dioxide
   iii	Does not support combustion	b	Nitrogen
   iv	Fine hair inside nose	1	Dust particles
   v	Chimney in factories	d	Smoke

2. State whether the following statements are true or false. In case of false statement, write the correct one.
   (i) Oxygen returns to atmosphere by the process of respiration in plants.
   (a) True
   (b) False
   (ii) Aeroplanes can fly without the presence of air.
   (a) True
   (b) False
   
   (i) Correct option: (b) False.
   Solution: Oxygen returns to atmosphere by the process of photosynthesis in plants.
   (ii) Correct option: (b) False
   Solution: Air helps for the movement of aeroplanes.
   
   
3. Name the following:
   (a) Air in motion.
   (b) Supports for burning and essential for living organisms.
   
   Solution:
   (a) Wind
   (b) Oxygen
   
   
4. Find the odd one out:
   • Carbon dioxide,
   • Nitrogen,
   • Pollen grains,
   • Oxygen.
   
   Solution:
   Pollen grains 
   Because carbon dioxide, nitrogen, and oxygen are gases and components of air, while pollen gain is neither a gas nor an air component.
   
   
5. Solve the following crossword based on “Methods of Separation of Mixtures”:
   Down:
   (a) A structure that has parts which are turned around by the wind and that is used to produce power, pump water, etc.
   (b) Component of air necessary for water cycle
   (c) These living creatures use oxygen dissolved in water
   (d)  Used in photosynthesis
   
   Across:
   (b) A weather vane often in the figure of a cock mounted so as to turn freely with the wind and show its direction.
   (e) A chemical that is found in the air that has no color, taste, or smell, and that is necessary for life.
   (f) The gas surrounding the earth.
   (g) Makes up a large part of the atmosphere.
   
   
   Solution:
   
   
   Multiple Choice Questions
   
   
6. Determine which of the following does not necessitate the use of wind.
   (a) 
   
   (b)
   
   (c)
   
   (d)
   
   
   Correct option: (d)
   
   Solution: River flowing does not need wind since it flows from higher level to lower level by the force of gravity. Wet clothes get dried due to wind, windmills need wind for movement of blades, and air acts as pollinator by carrying pollens for pollination.
   
   
7. Manjiri created the following diagrams for a science fair. What should she substitute for A, B, C, and D?
   
   
   

   	A	B	C	D
   (a)	Carbon dioxide	Oxygen	Oxygen	Carbon dioxide
   (b)	Oxygen	Carbon dioxide	Carbon dioxide	Oxygen
   (c)	Oxygen	Carbon dioxide	Oxygen	Carbon dioxide
   (d)	Carbon dioxide	Oxygen	Carbon dioxide	Oxygen

   
   Correct option: (a)
   

   A	B	C	D
   Carbon dioxide	Oxygen	Oxygen	Carbon dioxide

   Solution: The first picture is of photosynthesis in sunlight wherein plants inhales carbon dioxides and exhales oxygen at daytime while the second picture is of respiration wherein plants inhales oxygen and exhales carbon dioxide at night.
   
   
8. Which of the following activities can be done without the presence of air.
   (a) Winnowing
   (b) Threshing
   (c) Photosynthesis
   (d) Respiration
   
   Correct option: (b) Threshing
   Solution: Threshing is a separating technique used to separate lighter particles such as grains from hard substance such as stalks by the process of beating on a hard substance such as stone. It does not require air. But winnowing is a process by which chaff is separated from grain using wind. Also, photosynthesis and respiration requires the presence of carbon dioxide and oxygen respectively.
   
   
9. When Neelam returned after two days, the soil in the plant pots had dried entirely and formed a lump. When she poured some water, bubbles sprang from the soil, and the water began to go down the dirt lump, causing the soil to become loose and, eventually, wet. Which of the experiment's findings demonstrates the existence of air in the soil?
   (a) The water seeped into the lump.
   (b) The soil got wet
   (c) The soil became loose
   (d) Appearance of bubbles
   
   Correct option: (d) Bubbles came out
   Solution: Air occupies spaces in-between the empty spaces in the soil. When water is added, it replaces the air and as air is lighter than water it comes out as bubbles which conforms the presence of air.
   
   
10. Granthali was carefully listening to all of the instructions given by the flight attendant while travelling by Air India for the first time with her parents. When the flight attendant mentioned the masks dropping down in case of an emergency to aid the breathing process, she inquired to her parents about what comes through those masks. Can you figure out what it must be?
    
    (a) Water
    (b) Oxygen
    (c) Candies
    (d) Tissue paper
    
    Correct option: (b) Oxygen
    Solution:  The mask drops to provide oxygen in the event of an emergency aboard an aircraft.
    
    Case Study/ Paragraph based Questions
    
    
11. Read the passage and answer the following questions: 
    As expected, Archie was fired up but a little nervous about the dive. With a quick, comprehensive briefing, her dive instructor, Mridul calmed her down and after “trimming” her buoyancy belt and oxygen cylinder, Archie was ready for her FIRST dive!! The dive lasted forty five minutes and she dove down to a depth of 6 feet. She could see beautiful plants, corals, and colorful fishes all around her. She could see bubbles coming out from her mouth. She returned to the boat totally exhilarated, full of tales of the underwater sea life she had seen. 
    
    (a) Can you guess what the bubbles from Archie’s mouth must be made of?
    (b) Archie was fascinated by the aquatic flora and colorful fishes and was intrigued as to how they survived without breathing. Can you explain?
    (c) Can you guess what must be there inside bouncy belt and which of the following property can be explained with it?
    
    A. Water, light water help to swim and float in deep sea
    B. Alcohol, alcohol which is lighter than water so help to float in deep sea
    C. Air, the air is filled in the empty belt occupies space in the belt and help to float in deep sea since it is lighter than water
    D. Stones, stones helps to go deep down in the sea due to their heaviness
    
    Solution:
    (a) The bubbles coming out of Archie’s mouth contains exhaled air containing carbon dioxide as by-product of respiration.
    (b) Air forms homogeneous mixture with water, hence aquatic living creatures can use the oxygen dissolved in water for their respiration.
    (c) Correct option: (C) Air, the air is filled in the empty belt occupies space in the belt and help to float in deep sea since it is lighter than water
    Solution: The air is filled in the empty belt which explains the property of air that the air occupies space and help to float in deep sea since it is lighter than water in heaviness.
    
    Subjective Questions
    
    
12. Aaditya went to the officials to gather mountaineering needs such as headwear, footware, ice axe, technical clothes, and cylinder; etc., for his adventurous mountaineering on the Himalayan Mountains with his younger brother Jayesh. Jayesh was taken aback and concerned when he saw the massive cylinder and asked Aaditya why he was carrying such a hefty load with him to prepare supper when he had only seen LPG cylinders at home. Can you dispel Jayesh's scepticism?
    
    
    Solution: The cylinder used for mountaineering is filled with oxygen gas. Mountaineers use oxygen taken in oxygen cylinders for breathing at high altitudes where oxygen is scarce in the air.
    
    
13. Comment: Air is a mixture.
    
    Solution: Air is a homogeneous mixture. The mixture of gases forming the atmosphere is called the air. Air is a homogenous mixture containing about 78% Nitrogen, 21% oxygen, and the remaining 1% of air is constituted by carbon dioxide, water vapour and  some inert gases.
    
    
    
14. Jack and Jill went to nearby river with their teacher to get a pail of water.  They took tumbler along with them. But Jack was unable to fill water in the tumbler. He put the tumbler in the well as shown below. 
    
    What must be wrong with Jack’s method of filling water in the tumbler? Can you explain how to fix it and which property is discussed here?
    
    Solution: Empty tumbler contains air in it. The tumbler or bucket has to be tilted a bit so that the air present in the empty tumbler can get a way to come out and water can easily fill in. The property discussed here is air occupies space.
    
    
15. Vivek went to deep forest as a part of an expedition. He saw a beam of light sparkling in the middle of a canopy. What that must be?
    
    
    Solution: The dust particles present in the air shines when sunlight falls on it due to the reflection of light by dust particles. Hence, the zone of sunlight coming as a narrow beam of light sparkles.
    
    
16. On a beautiful winter morning, Geeta’s foot got wet while walking on the grass in the backyard of her native place. She was amazed to see that the grass was wet without water showering and went running to her Dadi to clear her doubt. What it indicates?
    
    
    Solution: One of air component’s is water vapour which condenses on a cold day and get converted into tiny droplets of water which are termed as dew drops which can be seen early morning on the grass.
    
    Assertion Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
    
    
17. Assertion (A): Windmills are used to draw water from tube wells.
    Reason (R): Windmills get rotated by the use of electricity.
    
    Correct option: (c) A is true but R is false.
    Solution: Windmills which get rotated due to wind are used to draw water from tube wells. So, the assertion is true but the reason is false.
    
    
18. Assertion (A): Oxygen is refilled into the atmosphere from the universe.
    Reason (R): Oxygen of the atmosphere does not get used up since a large number of organisms are consuming it.
    
    Correct answer: (d) A is false but R is true.
    Solution: The oxygen in the atmosphere is never depleted because it is constantly replenished by plants through the process of photosynthesis, in which plants absorb carbon dioxide and exhale oxygen into the atmosphere in presence of sunlight.
    
    
19. Assertion (A): Earthworms come out of the soil during heavy rains.
    Reason (R):  Water fills up the spaces in the soil occupied by air.
    
    Correct answer: (a) Both A and R are true and R is the correct explanation of A.
    Solution: The air occupies the spaces between the holes and burrows in the soil. As water is poured into this soil, bubbles are formed by displacing air. As a result, during heavy rains, animals and insects like earthworms living in the soil cannot breathe since water displaces the air from soil. Therefore, it breathes air out of the soil. So, both the assertion and reason are true and the reason is the correct explanation of assertion.
    
    
20. Assertion (A): Tyres are filled with air
    Reason (R): Air is found everywhere.
    
    Correct answer: (b) Both A and R are true and R is not the correct explanation of A.
    Solution: Tyres used for vehicles are filled with air. So the assertion is true. Air is present everywhere. So, the reason is also true. But tyres are filled with air because air occupies space and exerts enough pressure from inside of tyre so that fully filled inflated tyres are ready to glide over rough roads. Thus, the reason is not the correct explanation of assertion.