Chapter-12 Atmosphere — Online MCQ Test
SOCIAL · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-12 Atmosphere with a free chapter-wise online MCQ test.
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.
Chapter-12 Atmosphere — Important Questions & Answers
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.
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.
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.
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.
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.
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.