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Air and Water Practice Questions

Class 7 · Social Science · 1127 free MCQs with instant results and detailed explanations.

1127
Total
341
Easy
555
Medium
231
Hard

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Topics in Air and Water

Water Cycle 394
Distribution of Water 363
Atmosphere Layers 370

Sample Questions from Air and Water

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the layer of the atmosphere that is closest to the Earth's surface called?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Show Answer & Explanation
Correct Answer: A
The troposphere is the closest layer to the Earth's surface, where we live and where weather occurs. It extends up to about 8-15 kilometers above the Earth.
Q2
Easy
What is the layer of the atmosphere closest to the Earth's surface?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Show Answer & Explanation
Correct Answer: A
The troposphere is where we live and where weather occurs, making it the closest layer to the Earth's surface.
Q3
Easy
What phenomenon occurs in the troposphere?
A. Space travel
B. Weather changes
C. Satellite operation
D. Auroras
Show Answer & Explanation
Correct Answer: B
The troposphere is where all weather phenomena, like rain and clouds, occur.
Q4
Medium
Which layer of the atmosphere is closest to Earth?
A. Stratosphere
B. Mesosphere
C. Troposphere
D. Thermosphere
Show Answer & Explanation
Correct Answer: C
The troposphere is the layer of the atmosphere that is closest to Earth's surface, where all weather events occur.
Q5
Medium
What is the main function of the mesosphere?
A. Weather formation
B. Burning up meteoroids
C. Ozone absorption
D. Temperature regulation
Show Answer & Explanation
Correct Answer: B
The mesosphere is known for burning up meteoroids due to high friction, protecting Earth from space debris.
Q6
Medium
Which atmospheric layer is known for its high temperatures due to solar radiation?
A. Troposphere
B. Stratosphere
C. Thermosphere
D. Exosphere
Show Answer & Explanation
Correct Answer: C
The thermosphere is characterized by high temperatures resulting from solar radiation, often exceeding 1000°C.
Q7
Medium
Which gas is primarily responsible for greenhouse effects in the atmosphere?
A. Oxygen
B. Carbon Dioxide
C. Nitrogen
D. Argon
Show Answer & Explanation
Correct Answer: B
Carbon dioxide is a significant greenhouse gas that traps heat in the atmosphere, contributing to global warming.
Q8
Hard
Which layer of the atmosphere is closest to the Earth's surface and contains most of the atmospheric mass?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Show Answer & Explanation
Correct Answer: A
The troposphere is the lowest layer of the atmosphere where weather occurs and contains about 75% of the atmosphere's mass.
Q9
Hard
What is the main characteristic of the stratosphere compared to the troposphere?
A. It contains the ozone layer
B. It is where weather occurs
C. It is the densest layer
D. It is closest to the Earth's surface
Show Answer & Explanation
Correct Answer: A
The stratosphere is known for containing the ozone layer, which protects the Earth from harmful UV radiation.
Q10
Hard
Which atmospheric layer is directly above the stratosphere and is characterized by a decrease in temperature?
A. Troposphere
B. Mesosphere
C. Exosphere
D. Ionosphere
Show Answer & Explanation
Correct Answer: B
The mesosphere is the layer above the stratosphere, characterized by decreasing temperature with altitude.

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Air and Water — Class 7 Social Science Practice Questions Online

This page contains 1127 practice MCQs for the chapter Air and Water in Class 7 Social Science. The questions are organized by difficulty — 341 easy, 555 medium, 231 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.