Chapter Exam

Chapter-12 Atmosphere — Online MCQ Test

Q: Which gas is present in the largest amount in the atmosphere?

Answer: B. Nitrogen — Nitrogen forms about 78% of the atmosphere, making it the most abundant gas. Oxygen is the second most abundant gas.

Q: The lowest layer of the atmosphere is called the ______.

Answer: C. Troposphere — The troposphere is the lowest layer of the atmosphere. Most weather changes occur in this layer.

Q: Weather changes mainly take place in which layer of the atmosphere?

Answer: A. Troposphere — The troposphere contains most of the air and water vapour, so weather phenomena occur there. Clouds, rain, and storms are formed in this layer.

Q: Which statement about the troposphere is correct?

Answer: B. It contains almost all weather phenomena — The troposphere is the layer where clouds, rain, thunderstorms, and winds occur. It has most of the atmosphere’s water vapour and dust.

SOCIAL · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-12 Atmosphere with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL. This chapter covers: Description Explains the composition structure and weather elements of the atmosphere Keywords Troposphere Jet Stream Cyclone Humidity Anemometer. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-12 Atmosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL — Chapter-12 Atmosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which gas is present in the largest amount in the atmosphere?

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

Answer: B. Nitrogen
Nitrogen forms about 78% of the atmosphere, making it the most abundant gas. Oxygen is the second most abundant gas.

The lowest layer of the atmosphere is called the ______.

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

Answer: C. Troposphere
The troposphere is the lowest layer of the atmosphere. Most weather changes occur in this layer.

Weather changes mainly take place in which layer of the atmosphere?

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

Answer: A. Troposphere
The troposphere contains most of the air and water vapour, so weather phenomena occur there. Clouds, rain, and storms are formed in this layer.

Which statement about the troposphere is correct?

A. It is the highest layer of the atmosphere
B. It contains almost all weather phenomena ✓
C. It has no water vapour
D. It is the layer where satellites orbit

Answer: B. It contains almost all weather phenomena
The troposphere is the layer where clouds, rain, thunderstorms, and winds occur. It has most of the atmosphere’s water vapour and dust.

Which statement about cyclones is most accurate?

A. They always form in the stratosphere
B. They are associated with low pressure and rotating winds ✓
C. They are created by anemometers
D. They occur only in dry regions without moisture

Answer: B. They are associated with low pressure and rotating winds
Cyclones are low-pressure systems with spiralling winds and usually form over warm oceans. Moisture and pressure differences play a major role in their development.

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