ICSE Class 6 Chemistry - Air and Atmosphere - Test 3 (Advanced)
1. An inverted glass is pushed into a tub of water. Water does not enter the glass fully because:
A. Water has no weight
B. Air inside the glass occupies space
C. Glass dissolves in water
2. Two balloons are tied to a stick. One is inflated and the other is not. The inflated side goes down. This proves that air:
A. Has colour
B. Is not matter
C. Has mass
3. A candle burns well in open air because air contains:
A. Oxygen
B. Dust only
C. Water droplets only
4. A burning candle is covered with a glass jar. After some time, the candle stops burning. Why?
A. Nitrogen starts burning
B. Oxygen becomes insufficient
C. The jar produces water
5. Which statement correctly compares oxygen and nitrogen?
A. Nitrogen supports burning more than oxygen
B. Oxygen and nitrogen are both solids
C. Oxygen supports burning, but nitrogen does not
6. A gas is poured over a small flame and the flame goes out. The gas may be:
A. Carbon dioxide
B. Oxygen
C. Fresh air only
7. Green plants help maintain the balance of gases in air by using:
A. Smoke
B. Carbon dioxide
C. Dust particles
8. How do green plants help animals and humans?
A. They add smoke to air
B. They remove all nitrogen from air
C. They release oxygen
9. A cold steel plate is held above steam and droplets form on it. This shows that air or steam contains:
A. Water vapour
B. Sand grains
C. Iron pieces
10. In a dark room, tiny particles are seen in a beam of sunlight. These particles are mostly:
A. Large stones
B. Dust particles
C. Pure oxygen crystals
11. Which is an important protective role of the atmosphere?
A. It removes all oxygen
B. It turns water into metal
C. It helps protect life on Earth
12. Dry leaves move on the ground during a breeze because moving air can:
A. Exert force
B. Become a solid stone
C. Remove gravity
13. A windmill works because wind:
A. Has no movement
B. Can move the blades
C. Is always hot
14. Why can smoke-filled air be harmful to people?
A. It contains only clean oxygen
B. It is always pure water vapour
C. It may contain harmful substances
15. Which activity can increase air pollution?
A. Burning dry leaves
B. Planting saplings
C. Walking to school
16. Which action is best for improving air quality?
A. Burning plastic waste
B. Growing more trees
C. Releasing more smoke
17. A glass full of water is covered with a card and turned upside down carefully. The card stays for a while mainly due to:
A. Fire
B. Dust
C. Air pressure
18. A balloon fixed on a bottle becomes bigger when the bottle is placed in warm water. This shows that warm air:
A. Expands
B. Freezes
C. Turns into dust
19. If the warmed bottle with a balloon is placed in cold water, the balloon may become smaller because air:
A. Becomes gold
B. Contracts on cooling
C. Loses all mass
20. Which observation best shows the presence of air even though we cannot see it?
A. A shadow appears on a wall
B. A stone lies on the ground
C. A kite flies in the wind