Class 11 Geography MCQ Chapter 15 Composition and Structure of the Atmosphere

Class 11 Geography MCQ Chapter 15 Composition and Structure of the Atmosphere Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Geography MCQ Chapter 15 Composition and Structure of the Atmosphere Question Answer and select need one. AHSEC Class 11 Geography MCQ Chapter 15 Composition and Structure of the Atmosphere Question Answer in English Download PDF. AHSEC Class 11 Elective Geography MCQs English Medium.

Class 11 Geography MCQ Chapter 15 Composition and Structure of the Atmosphere

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 11 Elective Geography Multiple Choice Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Elective Geography Objective Type Question Answer in English for All Chapters, You can practice these here.

Composition and Structure of the Atmosphere

Chapter: 15

1. What is the concentration of nitrogen in the atmosphere?

(a) 20.949%

(b) 78.087%

(c) 0.934%

(d) 21.0%

Ans: (b) 78.087%

2. Up to what height does the Earth’s atmosphere extend?

(a) 30 km.

(b) 70 km.

(c) 10,000 km.

(d) 500 km.

Ans: (c) 10,000 km.

3. How many layers does the atmosphere have?

(a) One.

(b) Two.

(c) Three.

(d) Four.

Ans: (d) Four.

4. What percentage of atmospheric gases is found within 29 km of sea level?

(a) 97%

(b) 99%

(c) 80%

(d) 50%

Ans: (a) 97%

5. Approximately up to what height from sea level does the atmosphere extend?

(a) 20,000 km.

(b) 10,000 km.

(c) 30,000 km.

(d) 40,000 km.

Ans: (b) 10,000 km.

6. Which gas is most abundant in the atmosphere?

(a) Oxygen.

(b) Argon.

(c) Nitrogen.

(d) Carbon dioxide.

Ans: (c) Nitrogen.

7. Which atmospheric gas is mainly responsible for the greenhouse effect?

(a) Oxygen.

(b) Methane.

(c) Nitrogen.

(d) Carbon dioxide.

Ans: (d) Carbon dioxide.

8. The regular decrease of temperature in the troposphere with altitude is called—

(a) Lapse rate.

(b) Nitrogen.

(c) Hydrogen.

(d) Troposphere.

Ans: (a) Lapse rate.

9. The presence of water vapour in the lower part of the atmosphere determines—

(a) Lightness.

(b) Pressure.

(c) Density.

(d) Humidity.

Ans: (d) Humidity.

10. What is the name of the uniform layer of air extending up to 8–10 km from sea level?

(a) Stratosphere.

(b) Troposphere.

(c) Mesosphere.

(d) Thermosphere.

Ans: (b) Troposphere.

11. Up to what height from the Earth’s surface are atmospheric components found in nearly uniform proportion?

(a) 50 km.

(b) 60 km.

(c) 70 km.

(d) 80 km.

Ans: (c) 70 km.

12. What are the tiny light-attracting particles in the atmosphere called?

(a) Dust particles.

(b) Rays.

(c) Vapour.

(d) None of these.

Ans: (a) Dust particles.

13. In the lower air of the warm-humid tropical zone, what percentage of water vapour may be present by volume?

(a) 2%

(b) 3%

(c) 4%

(d) 5%

Ans: (c) 4%

14. What is the outermost layer of the atmosphere above the ionosphere (above 400 km) called?

(a) Aurora.

(b) Exosphere.

(c) Lapse rate.

(d) None of these.

Ans: (b) Exosphere.

15. Nitrogen and oxygen together occupy what percentage of the total atmospheric volume?

(a) 69.036%

(b) 79.036%

(c) 99.036%

(d) 89.036%

Ans: (c) 99.036%

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