Class 6 Science Composition of Air MCQs
Class 6 Science Composition of Air MCQs
Class: 6 | Subject: Science
Section 13: Air & Environment
Topic: Composition of Air
Based on NCERT Syllabus | CBSE Board Examination Pattern
Section 13: Air & Environment
Topic: Composition of Air
Based on NCERT Syllabus | CBSE Board Examination Pattern
1. Air is mainly a mixture of:
Answer: C. Gases
Air is a mixture containing nitrogen, oxygen, carbon dioxide, water vapour and other gases.
Air is a mixture containing nitrogen, oxygen, carbon dioxide, water vapour and other gases.
2. The largest component of air is:
Answer: B
Nitrogen forms about 78% of air and helps dilute oxygen.
Nitrogen forms about 78% of air and helps dilute oxygen.
3. Percentage of oxygen in air is about:
Answer: C
Oxygen supports respiration and combustion.
Oxygen supports respiration and combustion.
4. Carbon dioxide in air is about:
Answer: C
Though small in amount, CO₂ is vital for photosynthesis.
Though small in amount, CO₂ is vital for photosynthesis.
5. Gas essential for breathing:
Answer: B
Oxygen is required for respiration.
Oxygen is required for respiration.
6. Plants use CO₂ for:
Answer: B
CO₂ + water + sunlight → food + oxygen.
CO₂ + water + sunlight → food + oxygen.
7. Water vapour in air causes:
Answer: A
It determines moisture level.
It determines moisture level.
8. Inert gases include:
Answer: C
Argon is a noble gas present in small amount.
Argon is a noble gas present in small amount.
9. Air is:
Answer: D
Pure air has no colour, smell or taste.
Pure air has no colour, smell or taste.
10. Nitrogen helps in:
Answer: C
Prevents rapid burning.
Prevents rapid burning.
11. Oxygen supports:
Answer: C
Essential for life & burning.
Essential for life & burning.
12. Excess CO₂ causes:
Answer: B
Greenhouse effect.
Greenhouse effect.
13. Air pressure is due to:
Answer: A
Air has mass.
Air has mass.
14. Atmosphere contains:
Answer: C
Various gases present.
Various gases present.
15. Air helps in flying by:
Answer: A
Lift due to air pressure.
Lift due to air pressure.
16. Air dissolves in water as:
Answer: D
Dissolved gases support aquatic life.
Dissolved gases support aquatic life.
17. Moist air contains more:
Answer: C
High humidity.
High humidity.
18. Dry air lacks:
Answer: C
Low humidity.
Low humidity.
19. Air is essential for:
Answer: D
Supports many processes.
Supports many processes.
20. Study of air is part of:
Answer: B
Atmosphere deals with air.
Atmosphere deals with air.
