Time: 2 Hours
Maximum Marks: 80
Section A: Fill in the Blanks (10 × 1 = 10 marks)
- The layer of air that surrounds the Earth is called the __________.
- Air occupies __________ and has __________.
- The process by which plants release oxygen is called __________.
- The movement of air from high-pressure area to low-pressure area is called __________.
- Water changes into water vapour due to __________.
- __________ is the main source of fresh water on Earth.
- The gas that helps in burning is __________.
- The process of cooling water vapour to form water droplets is called __________.
- __________ helps seeds and pollen to travel from one place to another.
- About __________ percent of the Earth’s surface is covered with water.
Section B: Multiple Choice Questions (10 × 1 = 10 marks)
- Which gas is most abundant in air?
a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen - Which of the following is NOT a property of air?
a) Has weight b) Has shape c) Occupies space d) Exerts pressure - Which form of water is found in clouds?
a) Solid b) Liquid c) Gas d) Ice - Wind energy is mainly used to:
a) Produce water b) Generate electricity c) Stop air pollution d) Melt ice - Which process forms clouds?
a) Evaporation b) Condensation c) Freezing d) Melting - Which gas is released during respiration?
a) Oxygen b) Nitrogen c) Carbon dioxide d) Helium - Which water source is man-made?
a) River b) Lake c) Well d) Rain - What causes day and night breezes near sea?
a) Water cycle b) Difference in heating of land and water c) Rotation of Earth d) Pollution - Which activity pollutes water the most?
a) Bathing b) Washing clothes c) Industrial waste discharge d) Drinking - Which instrument is used to measure wind direction?
a) Thermometer b) Rain gauge c) Wind vane d) Barometer
Section C: True or False (8 × 1 = 8 marks)
- Air cannot be compressed.
- Oxygen supports burning.
- All water on Earth is fit for drinking.
- Plants need carbon dioxide for photosynthesis.
- Moving air is called wind.
- Water vapour is visible to our eyes.
- Rainwater harvesting helps conserve water.
- Air helps in seed dispersal.
Section D: Match the Following (6 × 1 = 6 marks)
| Column A | Column B |
|---|---|
| 1. Oxygen | a) Breathing |
| 2. Nitrogen | b) Burning |
| 3. Windmill | c) Largest component of air |
| 4. Evaporation | d) Electricity generation |
| 5. Condensation | e) Water vapour to liquid |
| 6. Rain | f) Change of water to vapour |
Section E: One Word Answer (8 × 1 = 8 marks)
- Air in motion
- Process of cleaning dirty water
- Instrument used to measure rainfall
- Solid form of water
- Continuous movement of water on Earth
- Gas essential for breathing
- Main source of heat causing evaporation
- Layer of gases surrounding the Earth
Section F: Short Answer Questions (8 × 3 = 24 marks)
- Write any three uses of air.
- How does air help in burning?
- What is evaporation? Give one example.
- Write any three sources of water.
- Why is clean drinking water important?
- Explain sea breeze.
- How do plants and animals depend on water?
- Write any three ways to save water.
Section G: Long Answer Questions (5 × 4 = 20 marks)
- Describe the composition of air.
- Explain the water cycle with a neat diagram.
- Explain how air exerts pressure with an example.
- What are the causes and effects of water pollution?
- Explain the importance of air and water for life on Earth.
Section H: Case-Based Questions (3 × 5 = 15 marks)
Case Study 1:
Riya washed her clothes and hung them outside on a sunny and windy day. The clothes dried very fast.
Answer the following:
a) Name the process involved in drying of clothes.
b) Which two factors increased the speed of drying?
c) Explain how wind helps in drying clothes.
d) Write one more daily life example of this process.
Case Study 2:
A village faces water shortage every summer. The village school starts collecting rainwater from rooftops into tanks.
Answer the following:
a) Name this method of water conservation.
b) Why is this method important?
c) Write any two ways to collect rainwater.
d) Write one advantage of this method.
Case Study 3:
A factory releases dirty water into a nearby river. Soon, fish start dying and people fall sick.
Answer the following:
a) What is this problem called?
b) Write two harmful effects of this problem.
c) How does this problem affect aquatic life?
d) Write two ways to prevent this problem.
Section I
- Water cycle – correct labels
- Air occupies space – correct experiment diagram
End of Paper
ANSWER KEY (For Teachers Only)
Section A: Fill in the Blanks
- Atmosphere
- Space, weight
- Photosynthesis
- Wind
- Heat
- Rain
- Oxygen
- Condensation
- Air / Wind
- 71
Section B: Multiple Choice Questions
- b) Nitrogen
- b) Has shape
- c) Gas
- b) Generate electricity
- b) Condensation
- c) Carbon dioxide
- c) Well
- b) Difference in heating of land and water
- c) Industrial waste discharge
- c) Wind vane
Section C: True or False
- False
- True
- False
- True
- True
- False
- True
- True
Section D: Match the Following
1–a (Oxygen – Breathing)
2–c (Nitrogen – Largest component of air)
3–d (Windmill – Electricity generation)
4–f (Evaporation – Change of water to vapour)
5–e (Condensation – Water vapour to liquid)
6–b (Rain – Burning)
Section E: One Word Answer
- Wind
- Filtration
- Rain gauge
- Ice
- Water cycle
- Oxygen
- Sun
- Atmosphere
Section F: Short Answer Questions
- Air is used for breathing, supports burning, and helps in running windmills and dispersing seeds.
- Air contains oxygen which supports burning. If oxygen supply is cut off, fire stops burning.
- Evaporation is the process by which water changes into water vapour due to heat. Example: drying of wet clothes.
- Rivers, lakes, ponds, wells, rain, and glaciers are important sources of water.
- Clean drinking water prevents diseases like cholera and typhoid and keeps our body healthy.
- Sea breeze blows during the day because land heats faster than sea. Warm air rises over land and cool air from sea moves towards land.
- Plants need water for making food and growth. Animals need water for drinking, digestion, and survival.
- Water can be saved by turning off taps, reusing water, rainwater harvesting, and fixing leaks.
Section G: Long Answer Questions
- Air is a mixture of gases. Nitrogen forms about 78% of air, oxygen about 21%, and the remaining 1% includes carbon dioxide, water vapour, dust, and other gases.
- The water cycle includes evaporation, condensation, precipitation, and collection. Heat from the sun causes evaporation of water. Water vapour cools to form clouds by condensation. Rain or snow falls as precipitation and water collects in rivers, lakes, and oceans.
- Air exerts pressure on all objects. This can be shown by an inverted glass experiment where a card does not fall due to air pressure acting upward.
- Water pollution is caused by industrial waste, sewage, chemicals, and garbage. It leads to death of aquatic animals, spread of diseases, and shortage of clean drinking water.
- Air is essential for breathing and burning. Water is needed for drinking, farming, cleaning, and survival of all living beings.
Section H: Case-Based Questions
Case Study 1:
a) Evaporation
b) Wind and heat
c) Wind removes water vapour from clothes, allowing faster evaporation
d) Drying of sweat from our skin
Case Study 2:
a) Rainwater harvesting
b) It saves water and recharges groundwater
c) Rooftop harvesting, recharge pits
d) Provides water during summer
Case Study 3:
a) Water pollution
b) Spread of diseases, death of aquatic animals
c) Reduced oxygen harms fish and plants
d) Treat waste before release and follow pollution control laws
Section I: Diagram-Based Questions
- Water cycle diagram should show: Sun, evaporation, condensation, clouds, precipitation, and collection with correct labels.
- Air occupies space diagram should show: Inverted glass/balloon experiment with correct labeling.