Class 5 Science Air and Water worksheet / test paper based on chapter . It includes all types of questions — MCQs, Fill in the Blanks, True/False, Match the Following, Short and Long Answers — as per school test format for Class 5 .
Section A – Multiple Choice Questions (1×10 = 10 marks)
1. Which gas is most present in air?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Helium
2. The air layer closest to the Earth is called:
a) Stratosphere
b) Troposphere
c) Mesosphere
d) Exosphere
3. Which method removes soluble impurities from water?
a) Filtration
b) Sedimentation
c) Evaporation
d) Decantation
4. Which gas is used in balloons because it is lighter than air?
a) Oxygen
b) Carbon dioxide
c) Helium
d) Neon
5. Which layer protects us from harmful UV rays?
a) Mesosphere
b) Ozone layer
c) Troposphere
d) Exosphere
6. Which of these helps in pollination?
a) Water
b) Oxygen
c) Air
d) Nitrogen
7. Alum is used in which water purification method?
a) Distillation
b) Filtration
c) Loading
d) Evaporation
8. Which property of air is shown by inflating a balloon?
a) Air has colour
b) Air has taste
c) Air occupies space
d) Air is hot
9. Which gas helps in burning?
a) Nitrogen
b) Oxygen
c) Argon
d) Helium
10. Chlorine is added to water to:
a) Add colour
b) Remove smell
c) Kill germs
d) Add minerals
Section B – Fill in the Blanks (1×10 = 10 marks)
1. The Earth is surrounded by a thick layer of air called the ___________.
2. __________% of air is nitrogen.
3. The ozone layer is found in the ___________ layer.
4. The process of pouring clean water after sedimentation is called ___________.
5. The air layer where weather changes happen is the ___________.
6. A mixture of gases that we breathe is called ___________.
7. The cleanest form of water is ___________ water.
8. ___________ helps oxygen reach fire to keep it burning.
9. The method to remove germs from water at home is ___________.
10. ___________ gas is used in making bulbs.
Section C – True or False (1×10 = 10 marks)
1. Air has colour, taste and smell.
2. Air can be felt but cannot be seen.
3. Exosphere is the closest layer to the Earth.
4. Sedimentation removes soluble impurities.
5. Plants use carbon dioxide for photosynthesis.
6. Air does not exert pressure.
7. Water covers about 70% of the Earth’s surface.
8. Oxygen makes up 78% of the air.
9. Air helps in the process of drying clothes.
10. The process of heating water to remove germs is called boiling.
Section D – Match the Following (1×10 = 10 marks)
Match Column A with Column B:
| Column A | Column B |
| — | – |
| A. Helium | i. Burning |
| B. Oxygen | ii. Filled in balloons |
| C. Decantation | iii. Filtering dirt |
| D. Filtration | iv. Pouring after sedimentation |
| E. Troposphere | v. Weather changes occur here |
| Column A | Column B |
| — | – |
| F. Chlorine | vi. Kills germs |
| G. Ionosphere | vii. Reflects radio waves |
| H. Nitrogen | viii. 78% of air |
| I. Neon | ix. Used in signboards |
| J. RO purifier | x. Home water purifier |
Section E – Answer in 2-3 sentences each: (3×5 = 15 marks)
1. What is atmosphere?
2. What are the characteristics of air?
3. What is sedimentation and decantation?
4. Write any three uses of air.
5. What is filtration? How is it done?
Section F – Answer in 5-6 sentences each: (5×5 = 25 marks)
1. Explain the five layers of the atmosphere.
2. Describe the composition of air.
3. What are the different methods used to clean water at home and in water works?
4. What is air pressure? Explain with any one activity.
5. How is distilled water prepared? Write steps of distillation.
Class 5 Science Air and Water worksheet Answer Key
Section A – Multiple Choice Questions (1×10 = 10 marks)
1. c) Nitrogen
2. b) Troposphere
3. c) Evaporation
4. c) Helium
5. b) Ozone layer
6. c) Air
7. c) Loading
8. c) Air occupies space
9. b) Oxygen
10. c) Kill germs
Section B – Fill in the Blanks (1×10 = 10 marks)
11. atmosphere
12. 78%
13. stratosphere
14. decantation
15. troposphere
16. air
17. distilled
18. air
19. boiling
20. argon
Section C – True or False (1×10 = 10 marks)
21. False
22. True
23. False
24. False
25. True
26. False
27. True
28. False
29. True
30. True
Section D – Match the Following (1×10 = 10 marks)
| Column A | Column B (Answer) |
| — | – |
| A. Helium | ii. Filled in balloons |
| B. Oxygen | i. Burning |
| C. Decantation | iv. Pouring after sedimentation |
| D. Filtration | iii. Filtering dirt |
| E. Troposphere | v. Weather changes occur here |
| Column A | Column B (Answer) |
| — | – |
| F. Chlorine | vi. Kills germs |
| G. Ionosphere | vii. Reflects radio waves |
| H. Nitrogen | viii. 78% of air |
| I. Neon | ix. Used in signboards |
| J. RO purifier | x. Home water purifier |
Section E – Short Answer Questions (3×5 = 15 marks)
36. What is atmosphere?
The atmosphere is the layer of air that surrounds the Earth. It is made of gases like oxygen, nitrogen, and carbon dioxide.
37. What are the characteristics of air?
Air occupies space, has weight, and exerts pressure. Though we can’t see or smell it, we can feel it.
38. What is sedimentation and decantation?
In sedimentation, heavy particles settle down in water. In decantation, clear water is carefully poured out without disturbing the sediments.
39. Write any three uses of air.
Air helps in breathing.
Air helps in burning.
Air carries smells and sounds.
40. What is filtration? How is it done?
Filtration is the process to remove insoluble dirt from water using a filter. A filter paper is used in a funnel to separate solid particles.
Section F – Long Answer Questions (5×5 = 25 marks)
41. Explain the five layers of the atmosphere.
Troposphere: Nearest to Earth, weather changes occur here.
Stratosphere: Contains ozone layer, some planes fly here.
Mesosphere: Meteors burn in this layer.
Thermosphere: Thickest layer, space shuttles orbit here.
Exosphere: Outermost layer, air is very thin, satellites are here.
42. Describe the composition of air.
Air is made of 78% nitrogen, 21% oxygen, and 1% other gases like carbon dioxide, argon, helium, and neon. It also has dust, smoke, and water vapour.
43. What are the different methods used to clean water at home and in water works?
At home: Boiling, filtration, RO purifiers.
At water works: Sedimentation, filtration, and chlorination. Chlorine is used to kill germs.
44. What is air pressure? Explain with any one activity.
Air pressure is the force that air applies on surfaces.
Example: When we suck a drink with a straw, air pressure pushes the liquid up into the straw.
45. How is distilled water prepared? Write steps of distillation.
Water is heated to form vapour.
Vapour passes through a tube.
Cold water cools the vapour.
Vapour turns into water again.
Impurities are left behind. The clean water collected is distilled water.
