Sample modal question paper - CT 4 (class 4)

CT4 MODEL QUESTION PAPER

STD: IV – SCIENCE

Lessons: Air & Water

Time: 1 Hour
Total Marks: 35

 SECTION A – OBJECTIVE (10 Marks)

I. Tick the correct answer. (4 × ½ = 2)

1. Which gas supports burning?
   a) Nitrogen
   b) Oxygen
   c) Carbon dioxide
   d) Steam

2. The process of settling down of mud in water is called:
   a) Filtration
   b) Sedimentation
   c) Evaporation
   d) Boiling

3. Which of these causes air pollution?
   a) Planting trees
   b) Factory smoke
   c) Clean surroundings
   d) Rain

4. Water vapour changes into water by:
   a) Boiling
   b) Freezing
   c) Condensation
   d) Melting

II. Fill in the blanks. (4 × 1 = 4)

1. 1. The layer of air around the Earth is called ____________.

   2. The amount of water vapour in air is called ____________.

   3. The substance that dissolves in a liquid is called ____________.

   4. Adding chlorine to water kills ____________.

III. True or False (2 × 1 = 2)

4. Water vapour is the gaseous form of water.

5. Oil dissolves in water.

III. Analogy (2 × 1 = 2)

6. Ice : Solid :: Water : __________

7. Oxygen : Breathing :: Carbon dioxide : __________

 SECTION B – MAIN (25 Marks)

I. Write the scientific term. (5 × 1 = 5)

1. The layer of air around the Earth.

2. Change of water into vapour.

3. Waste water from homes.

4. Passing water through a cloth to remove impurities.

5. The amount of water vapour in air.

II. Give reasons. (3 × 2 = 6)

1. We should drink boiled water.

2. A matchstick burns only in the presence of air.

3. Cotton becomes heavier after falling into water.

III. Find the term using the clues. (2 × 2 = 4)

1. I am formed when smoke mixes with fog. Who am I?

2. I am the process in which clear water is carefully poured out after mud settles. Who am I?

IV. Picture-Based Questions (3 × 1= 3)

1. Observe the picture and answer:

a) Name the process shown.
b) What will happen if the clear water is poured carefully into another container?

2. 

a) Why does the flame go out?
b) Which gas is required for burning?

3. 

a) What is this type of pollution called?
b) Mention one way to reduce this pollution.

V. Answer briefly. (1 × 4 = 4)

1. Explain the three forms of water with examples.

VI. Reading Comprehension (3 × 1 = 3)

Read the passage carefully and answer the questions:

Water is very important for all living things. We use water for drinking, cooking, washing and cleaning. But water in rivers and lakes may contain germs. Boiling water kills germs. Chlorine is also added to water in water works to make it safe for drinking. We must avoid throwing waste into rivers because it pollutes water.

8. Name one method to kill germs in water.

9. Why should we not throw waste into rivers?

10. Where is chlorine added to water?

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