Chapter Exam

Chapter 5: Atmosphere — Online MCQ Test

Q: Which layer of the atmosphere contains most of the weather phenomena like clouds, rain, and storms?

Answer: B. Troposphere — The troposphere is the lowest layer of the atmosphere and contains most water vapour and dust, so almost all weather changes occur here.

Q: What is the normal lapse rate in the troposphere?

Answer: A. 6.5°C per 1000 m — The temperature generally decreases with height in the troposphere at an average rate of 6.5°C per 1000 metres.

Q: At the equator, low pressure generally develops because of:

Answer: B. Strong heating causing air to rise — Intense solar heating at the equator warms the air, making it lighter and causing it to rise and create low pressure.

GEOGRAPHY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 5: Atmosphere with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY. This chapter covers: This chapter covers atmospheric structure troposphere stratosphere layers temperature distribution pressure belts wind systems monsoon mechanics rainfall types and weather vs clima.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Atmosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY — Chapter 5: Atmosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which layer of the atmosphere contains most of the weather phenomena like clouds, rain, and storms?

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

Answer: B. Troposphere
The troposphere is the lowest layer of the atmosphere and contains most water vapour and dust, so almost all weather changes occur here.

What is the normal lapse rate in the troposphere?

A. 6.5°C per 1000 m ✓
B. 10°C per 1000 m
C. 1°C per 1000 m
D. 0.5°C per 1000 m

Answer: A. 6.5°C per 1000 m
The temperature generally decreases with height in the troposphere at an average rate of 6.5°C per 1000 metres.

In the tropics, why is the troposphere generally thicker than at the poles?

A. Because air pressure is higher in the tropics
B. Because of stronger heating and more vigorous convection ✓
C. Because ozone concentration is higher
D. Because the Earth rotates faster there

Answer: B. Because of stronger heating and more vigorous convection
Intense heating near the equator causes stronger convection currents, which makes the troposphere thicker in tropical regions.

At the equator, low pressure generally develops because of:

A. Cold descending air and weak solar radiation
B. Strong heating causing air to rise ✓
C. Permanent dryness and high altitude
D. Polar easterlies converging there

Answer: B. Strong heating causing air to rise
Intense solar heating at the equator warms the air, making it lighter and causing it to rise and create low pressure.

Which statement about monsoon winds is most accurate?

A. They are permanent winds blowing in the same direction throughout the year
B. They reverse direction seasonally due to differential heating of land and sea ✓
C. They are caused only by the rotation of Earth
D. They blow only over deserts

Answer: B. They reverse direction seasonally due to differential heating of land and sea
Monsoon winds are seasonal winds that reverse direction because land and sea heat and cool at different rates, creating seasonal pressure changes.