Chapter Exam

Chapter 6: Atmosphere — Online MCQ Test

Q: Which gas constitutes the highest percentage by volume in the Earth's atmosphere?

Answer: B. Nitrogen — Nitrogen makes up approximately 78% of the Earth's atmosphere.

Q: In which layer of the atmosphere do most weather phenomena occur?

Answer: C. Troposphere — The troposphere is the lowest layer where temperature decreases with height and most weather changes occur.

Q: If the earth did not rotate, what would be the primary direction of global winds?

Answer: A. Directly from poles to the equator — Without the Coriolis force generated by rotation, air would flow directly from high pressure to low pressure.

GEOGRAPHY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 6: Atmosphere with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th GEOGRAPHY. This chapter covers: This chapter details atmospheric composition layers insolation heat budget temperature distribution and atmospheric pressure belts. Students analyze wind systems humidity cloud typ.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Atmosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th GEOGRAPHY — Chapter 6: Atmosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which gas constitutes the highest percentage by volume in the Earth's atmosphere?

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

Answer: B. Nitrogen
Nitrogen makes up approximately 78% of the Earth's atmosphere.

In which layer of the atmosphere do most weather phenomena occur?

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

Answer: C. Troposphere
The troposphere is the lowest layer where temperature decreases with height and most weather changes occur.

Which of the following describes the 'Heat Budget' of the Earth?

A. The balance between incoming solar radiation and outgoing terrestrial radiation. ✓
B. The amount of heat trapped by greenhouse gases.
C. The process of conduction in the soil.
D. The total heat generated by volcanic activity.

Answer: A. The balance between incoming solar radiation and outgoing terrestrial radiation.
The heat budget maintains the Earth's constant average temperature through a balance of energy gain and loss.

If the earth did not rotate, what would be the primary direction of global winds?

A. Directly from poles to the equator ✓
B. East to West
C. Spiral motions in all regions
D. Only circular patterns

Answer: A. Directly from poles to the equator
Without the Coriolis force generated by rotation, air would flow directly from high pressure to low pressure.

Which of the following combinations correctly identifies the lapse rate and its effect?

A. Normal Lapse Rate: 6.5C per 1000m; leads to cooling. ✓
B. Normal Lapse Rate: 10C per 1000m; leads to warming.
C. Environmental Lapse Rate: 1C per 100m; affects only ozone.
D. Adiabatic Lapse Rate: constant; unrelated to height.

Answer: A. Normal Lapse Rate: 6.5C per 1000m; leads to cooling.
The normal lapse rate is the average rate at which temperature decreases with altitude in the troposphere.

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Chapter 7: The Biosphere