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UPSC Exam  >  UPSC Test  >  Geography CSE  >  Test: Air - UPSC MCQ

Air - Free MCQ Practice Test with solutions, UPSC Geography


MCQ Practice Test & Solutions: Test: Air (10 Questions)

You can prepare effectively for UPSC Geography for UPSC CSE with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Air". These 10 questions have been designed by the experts with the latest curriculum of UPSC 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Air - Question 1
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What surrounds the earth and provides the air we breathe?

Detailed Solution: Question 1

Answer: C) Atmosphere

Topic in NCERT: ATMOSPHERE

Line in NCERT: "Our earth is surrounded by a huge blanket of air called atmosphere. All living beings on this earth depend on the atmosphere for their survival. It provides us the air we breathe and protects us from the harmful effects of the sun's rays."

Test: Air - Question 2
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State whether the following statement is True or False:

The stratosphere is almost free from clouds and ideal for flying aeroplanes.

Detailed Solution: Question 2

The stratosphere is indeed almost free from clouds and is considered ideal for flying aeroplanes. This layer also contains a protective layer of ozone gas, which shields us from harmful sun rays. This absence of clouds and associated weather phenomena makes it safer for aircraft to travel without encountering turbulent weather conditions.

Topic in NCERT: STRATOSPHERE

Line in NCERT: "This layer is almost free from clouds and associated weather phenomenon, making conditions most ideal for flying aeroplanes."

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Test: Air - Question 3
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State whether the following statement is True or False:

The air pressure is highest at sea level and decreases with height.

Detailed Solution: Question 3

Air pressure is highest at sea level because the column of air above us is tallest, thus exerting the maximum pressure. As we ascend in altitude, the height of the air column decreases, resulting in a reduction in air pressure. Therefore, as we move away from sea level and ascend to higher elevations, the air pressure progressively diminishes. This principle explains why air pressure is greatest at sea level and decreases with increasing altitude.

Topic in NCERT: Air Pressure

Line in NCERT: "The air pressure is highest at sea level and decreases with height."

Test: Air - Question 4
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What layer of the atmosphere helps in radio transmission and reflects radio waves back to Earth?

Detailed Solution: Question 4

The correct answer is C: Ionosphere.

  • The ionosphere is a layer of Earth's atmosphere that contains a high concentration of ions and free electrons.
  • This layer extends from about 50 km to 1,000 km above the Earth's surface.
  • It plays a crucial role in radio communication by reflecting certain frequencies of radio waves back to Earth.
  • By reflecting radio waves, the ionosphere helps in long-distance radio transmission, allowing signals to travel beyond the horizon.

Topic in NCERT: THERMOSPHERE

Line in NCERT: "Ionosphere is a part of this layer. It extends between 80-400 km. This layer helps in radio transmission. In fact, radio waves transmitted from the earth are reflected back to the earth by this layer."

Test: Air - Question 5
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What is the short-term state of the atmosphere called?

Detailed Solution: Question 5

Weather refers to the short-term conditions of the atmosphere at a specific time and place. It includes factors such as temperature, humidity, wind speed, precipitation (rain, snow, etc.), and atmospheric pressure. Weather can change rapidly over minutes, hours, or days.

For example, weather describes if it is sunny, cloudy, raining, or snowing today. It focuses on immediate, day-to-day atmospheric conditions.

In contrast:

  • Climate refers to the long-term average of weather patterns over a period of time (usually 30 years or more) in a specific region.
  • Humidity is the amount of moisture or water vapor in the air.
  • Precipitation refers to any form of water that falls from clouds, such as rain, snow, sleet, or hail.

Thus, weather is the correct term for the short-term state of the atmosphere.

Topic in NCERT: WEATHER AND CLIMATE

Line in NCERT: "Weather is this hour-to-hour, day to day condition of the atmosphere."

Test: Air - Question 6
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State whether the following statement is True or False

The temperature of the atmosphere stays the same throughout the year.

Detailed Solution: Question 6

  • The temperature of the atmosphere does not stay the same throughout the year. It changes from season to season.
  • In summers, it is hotter, while in winters, it is colder.
  • This change happens because of the sun's energy that warms the Earth.
  • The amount of sun's energy is different at different places on Earth, which is why some places are hotter than others.
  • So, the temperature of the atmosphere changes, making the statement False.

Test: Air - Question 7
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Cold air is ____ than hot air

Detailed Solution: Question 7

Cold air is denser and heavy than warm air. The molecules are packed closer together. The amount of water vapor in the air also affects the density of the air. The more water vapor that is in the air, the less dense the air becomes. That is why cold, dry air is much heavier than warm, humid air.

Test: Air - Question 8
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Which layer of the atmosphere contains the ozone gas?

Detailed Solution: Question 8

The ozone layer is located in the stratosphere and plays a crucial role in shielding the Earth from the sun's harmful ultraviolet rays.

Topic in NCERT: Stratosphere

Line in NCERT: "One important feature of stratosphere is that it contains a layer of ozone gas."

Test: Air - Question 9
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All the weather phenomena like rainfall, fog and hailstorm occur in which layer

Detailed Solution: Question 9

Troposphere: It is the most important layer of the atmosphere. The air we breathe exists here. It has the following features:

  • Its average height is 13 km.
  • Almost all the weather phenomena occur in this layer. The weather phenomena include: Rainfall, Fog, Hailstorm etc.

Topic in NCERT: TROPOSPHERE

Line in NCERT: "Almost all the weather phenomena like rainfall, fog and hailstorm occur in this layer."

Test: Air - Question 10
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Which of the following gas has less composition in the air among others?

Detailed Solution: Question 10

In the air we breathe, the most plentiful gas is nitrogen. It's important for plants to grow and for us to breathe. Nitrogen helps plants and animals to live. Hydrogen is present in lesser quantities.

Topic in NCERT: COMPOSITION OF THE ATMOSPHERE

Line in NCERT: "Hydrogen is found in lesser quantities."

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About this UPSC Practice Test

This test contains 10 MCQs on Air with detailed solutions for each question. It is part of the Geography for UPSC CSE course on EduRev, designed to align with the current UPSC syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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If you found this Air MCQ Test helpful, you can further enhance your UPSC preparation with in-depth courses on EduRev, for all the subjects and topics available in Geography for UPSC CSE course. The course offers:
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  • MCQ Test: variety of questions as per the pattern of UPSC exam
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