Class 3 Science - Air and Water - CBSE Worksheets Solutions (2025)

Class 3 Exam>Class 3 Notes>Science for Class 3>Worksheet Solution: Air and Water

Multiple choice questions

Question 1: Which gas is used by the plants when they make food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Water vapour

Correct Answer is Option B.
Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.

Question 2: How much of the Earth’s surface is covered with water?
(a) 25%
(b) 97%

(c) 71%
(d) 1%

Correct Answer is OptionC.
Water covers about 71% of the earth's surface.

Question 3: Water is found in this form:
(a) Solid
(b) Liquid
(c) Gas
(d) All of these

Correct Answer is OptionD.
Water can occur in three states: solid (ice), liquid, or gas (vapor).

Question 4:Which of these is true for burning?
(a)Oxygen is formed.
(b)Carbon dioxide is formed.
(c)Carbon dioxide is used up.
(d)Oxygen and carbon dioxide are neither formed nor used up.

Correct Answer is OptionB.
During combustion or burning, carbon from fossil fuels combine with oxygen in the air to form carbon dioxide and water vapor.

Question 5: Which of the following helps to save water?
(a) Using a hose pipe to water plants.
(b) Closing the tap while brushing your teeth.
(c) Throw away the water used to wash vegetables and fruits.
(d) Using a shower to bathe.

Correct Answer is OptionB.
Closing the tap while brushing your teeth will save water.

Fill in the blanks

Question 6:

Air is a mixture of gases.
All living things need oxygen to breathe.
Flowing water is used to generate electricity.
When wind moves gently it is called breeze.
Ice melting from glaciers feeds rivers and lakes.

EduRev Tips:
The air around us is a mixture of gases, mainly nitrogen and oxygen
Most living things need oxygen to survive. Oxygen helps organisms grow, reproduce, and turn food into energy.
Hydroelectric energy is a form of renewable energy that uses the power of moving water to generate electricity.
Breeze: Slow and gentle moving wind is called breeze.
Ice melting from glaciers feeds rivers and lakes.

Match the following

Question 7:
(a) Windmill (i) Drinking water
(b) Potable water (ii) Solid state
(c) Oxygen (iii) Storm
(d) Ice cube (iv) Electricity
(e) Strong wind (v) Breathing

(a) Windmill - (iv) Electricity
(b) Potable - (i) Drinking water
(c) Oxygen - (v) Breathing
(d) Ice cube - (ii) Solid state
(e) Strong wind - (iii) Storm

True & False

Question 8:

Earth is also called as green planet. True
Potable water is the water which is safe to drink. True
We should use hose pipes to clean our cars. False
Air is required for burning. True
Plants do not need water for making their food. False

EduRev Tips:
Earth is called a green planet due to the presence of plants on it.
“Potable water” simply means water that is safe to drink, and it is becoming scarcer in the world.
It destroys lots of water.
Oxygen: Air contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.).
Plants need water for making their food.

Answer the following questions in brief

Question 9:What is air? What does air contain?

Air is made up of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon. It does not include water vapor because the amount of vapor changes based on humidity and temperature.

Question 10: Write any three uses of air.

The air in our atmosphere acts as insulation, keeping the Earth from getting too cold or too hot. Ozone, another type of gas in the air, also protects us from too much sunlight. Air in the atmosphere can also protect us from meteoroids.

Question 11: What are the sources of water?

The main sources of water are surface water, groundwater and rainwater.

Question 12: What are the three states in which water can be found in? 5. Mention five ways to save water.

Water can occur in three states: solid (ice), liquid, or gas (vapor).
Ways to save water:
Be aware and spread awareness.
Take quick showers.
Fix any leaky taps at home.
Use one utensil for drinking water.
Don't pour excess drinking water in the sink.

Observe the following image and answer the questions given below.

Question13: Identify the two gases A and B shown in the given image.

(a) _______________

(b) _______________

Question 14: Name the two processes shown in the given image.

_______________

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FAQs on Class 3 Science - Air and Water - CBSE Worksheets Solutions

1. What are the main sources of air pollution?

Class 3 Science - Air and Water - CBSE Worksheets Solutions (9)

Ans. The main sources of air pollution include industrial emissions, vehicle exhaust, burning of fossil fuels, open burning of waste, and dust and smoke from construction sites.

2. How does air pollution affect human health?

Class 3 Science - Air and Water - CBSE Worksheets Solutions (10)

Ans. Air pollution can have various negative effects on human health, including respiratory problems such as asthma and bronchitis, cardiovascular diseases, allergies, and even lung cancer. It can also worsen existing health conditions and reduce overall life expectancy.

3. What are the measures to reduce air pollution?

Class 3 Science - Air and Water - CBSE Worksheets Solutions (11)

Ans. To reduce air pollution, it is important to take measures such as promoting the use of clean and renewable sources of energy, improving fuel efficiency of vehicles, implementing stricter emission standards for industries, reducing open burning of waste, and increasing awareness about the importance of clean air.

4. Why is water conservation important?

Class 3 Science - Air and Water - CBSE Worksheets Solutions (12)

Ans. Water conservation is important because it helps in preserving this precious resource for future generations. It also helps in reducing water scarcity, maintaining the ecological balance of aquatic ecosystems, and saving energy and money by reducing the need for pumping, treating, and heating water.

5. How can we conserve water in our daily lives?

Class 3 Science - Air and Water - CBSE Worksheets Solutions (13)

Ans. There are several ways to conserve water in our daily lives, such as turning off the tap while brushing teeth or soaping hands, fixing leaky faucets and pipes, using a bucket instead of a hose for washing cars, using water-efficient appliances, and practicing responsible irrigation techniques in gardens and farms.

Related Exams

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About this Document

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	Oct 11, 2024 Last updated

Document Description: Worksheet Solution: Air and Water for Class 3 2024 is part of Science for Class 3 preparation. The notes and questions for Worksheet Solution: Air and Water have been prepared according to the Class 3 exam syllabus. Information about Worksheet Solution: Air and Water covers topics like and Worksheet Solution: Air and Water Example, for Class 3 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Worksheet Solution: Air and Water.

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