Chapter Exam

Chapter 7: Composition and Structure of Atmosphere — Online MCQ Test

Q: Which gas forms the largest part of the Earth's atmosphere by volume?

Answer: B. Nitrogen — Nitrogen is the most abundant atmospheric gas, making up about 78% of the air by volume.

Q: The layer of the atmosphere in which weather phenomena occur is called:

Answer: C. Troposphere — All major weather changes such as clouds, rainfall, and storms occur in the troposphere.

Q: A plane is flying at a height where the air is stable and free from most weather disturbances. In which layer is it most likely flying?

Answer: B. Stratosphere — The stratosphere is relatively calm and stable, so aircraft often fly in its lower part to avoid weather disturbances.

Q: Consider the following statements: 1. The atmosphere is composed mainly of nitrogen and oxygen. 2. Water vapour and dust are permanent gases. 3. Carbon dioxide is important for photosynthesis and heat retention. Which of the statements given above is/are correct?

Answer: B. 1 and 3 only — Nitrogen and oxygen are the major gases, and carbon dioxide is important for photosynthesis and warming. Water vapour and dust are variable, not permanent, components.

GEOGRAPHY · Grade 11 · CBSE(NCERT)

Practice Chapter 7: Composition and Structure of Atmosphere with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 GEOGRAPHY. This chapter covers: Atmosphere troposphere stratosphere mesosphere thermosphere atmospheric gases ozone weather climate atmospheric layers. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Composition and Structure of Atmosphere — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 GEOGRAPHY — Chapter 7: Composition and Structure of Atmosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which gas forms the largest part of the Earth's atmosphere by volume?

A. Oxygen
B. Nitrogen ✓
C. Carbon dioxide
D. Argon

Answer: B. Nitrogen
Nitrogen is the most abundant atmospheric gas, making up about 78% of the air by volume.

The layer of the atmosphere in which weather phenomena occur is called:

A. Stratosphere
B. Mesosphere
C. Troposphere ✓
D. Thermosphere

Answer: C. Troposphere
All major weather changes such as clouds, rainfall, and storms occur in the troposphere.

The temperature in the troposphere generally decreases with increase in altitude because:

A. The layer is heated mainly from below by the Earth's surface ✓
B. It contains no water vapour
C. Oxygen becomes heavier at higher levels
D. Solar radiation cannot enter the troposphere

Answer: A. The layer is heated mainly from below by the Earth's surface
The troposphere receives heat from the Earth's surface, so temperature falls as one goes upward.

A plane is flying at a height where the air is stable and free from most weather disturbances. In which layer is it most likely flying?

A. Troposphere
B. Stratosphere ✓
C. Mesosphere
D. Thermosphere

Answer: B. Stratosphere
The stratosphere is relatively calm and stable, so aircraft often fly in its lower part to avoid weather disturbances.

Consider the following statements: 1. The atmosphere is composed mainly of nitrogen and oxygen. 2. Water vapour and dust are permanent gases. 3. Carbon dioxide is important for photosynthesis and heat retention. Which of the statements given above is/are correct?

A. 1 only
B. 1 and 3 only ✓
C. 2 and 3 only
D. 1, 2 and 3

Answer: B. 1 and 3 only
Nitrogen and oxygen are the major gases, and carbon dioxide is important for photosynthesis and warming. Water vapour and dust are variable, not permanent, components.

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