CBSE Class 6 Science Air Around Us Assignment

Question 1. Match the following _

Answer: Correct matching: 1 - c, 2 - f, 3 - e, 4 - a, 5 - b, 6 - d
In simple words: Each component of air has specific properties and uses, such as nitrogen being the most abundant gas and oxygen supporting life and combustion.

Exam Tip: Memorize the percentage composition of gases in air along with their primary roles to solve matching questions accurately.

Question 2. Look at the figure below. There are tiny water drops seen on the outer surface of glass containing ice cubes. Name the process responsible -
Answer: Condensation
In simple words: When water vapor present in the warm air touches the cold surface of the glass, it loses heat and turns into tiny liquid water droplets.

Exam Tip: Always distinguish between evaporation (liquid to gas) and condensation (gas to liquid) when explaining water droplets on cold containers.

Question 3. Make a simple 'Firki' with paper provided and paste in the space given below-
Answer: (Practical Activity)
1. Take a square piece of paper.
2. Draw two lines diagonally from corner to corner meeting at the center.
3. Cut along the lines up to a short distance from the center.
4. Fold alternate corners to the center and fix them with a pin to a stick to make the firki rotate when air moves past it.
In simple words: A firki is a paper toy that rotates when wind or moving air pushes against its angled blades.

Exam Tip: This activity demonstrates that moving air (wind) exerts pressure and can perform mechanical work like rotating objects.

Question 4. Give any three uses of air?
Answer: 
1. Respiration: All living organisms require oxygen from the air for breathing and survival.
2. Combustion: Oxygen present in the air is essential for the burning of fuels to produce energy.
3. Generation of Electricity: Moving air (wind) is used to rotate wind turbines to generate electricity.
In simple words: Air is essential for breathing, burning things, and running wind turbines.

Exam Tip: List clear, distinct biological and physical uses of air to secure full marks.

Question 5. Define atmosphere?
Answer: The envelope of air that surrounds the Earth is known as the atmosphere. This blanket of air extends many kilometers above the Earth's surface and is held in place by Earth's gravity.
In simple words: The thick layer of air surrounding the Earth is called the atmosphere.

Question 6. Name two processes which maintain the balance of carbon dioxide and oxygen in the atmosphere.
Answer:
i) Photosynthesis
ii) Respiration (and combustion)
In simple words: Plants release oxygen during photosynthesis and consume carbon dioxide, while animals and humans consume oxygen and release carbon dioxide during respiration.

Exam Tip: Clearly state photosynthesis and respiration as the two reciprocal biological processes maintaining atmospheric gas balance.