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CTET Atmosphere of Earth — practice questions

Explore 59 free Atmosphere of Earth questions in CTET Social Studies. Open each question or exercise to read its content, reference answers and available explanation.

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Atmosphere of Earth questions and exercises with answers

Showing questions 1–30 of 59.

Which gas is the most abundant in dry air?Read the answer and worked solution →Which gas forms about 21 percent of dry air?Read the answer and worked solution →After nitrogen and oxygen, which gas is the third most abundant in dry air?Read the answer and worked solution →Which layer sits closest to the ground in Earth's atmosphere?Read the answer and worked solution →The ozone layer is found mainly in which atmospheric layer?Read the answer and worked solution →Which layer lies at the very top of the air, merging into space?Read the answer and worked solution →In which layer does most of Earth's weather take place?Read the answer and worked solution →In the stratosphere, what happens to temperature as you climb higher?Read the answer and worked solution →Which atmospheric layer is the coldest place on Earth?Read the answer and worked solution →Where is the troposphere the deepest?Read the answer and worked solution →What is the boundary between the troposphere and the stratosphere called?Read the answer and worked solution →Which boundary separates the stratosphere from the mesosphere above it?Read the answer and worked solution →What makes the air cooler as you climb in the troposphere?Read the answer and worked solution →At what altitude does the Karman line, the conventional edge of space, lie?Read the answer and worked solution →The aurora borealis and aurora australis occur mainly in which layer?Read the answer and worked solution →The International Space Station orbits in which layer?Read the answer and worked solution →Noctilucent clouds, the highest clouds, form in which layer?Read the answer and worked solution →In which layer do most meteors burn up on entry?Read the answer and worked solution →The thermosphere is very hot, yet feels cold to a human. Why?Read the answer and worked solution →How do air pressure and density change as altitude increases?Read the answer and worked solution →Standard sea-level atmospheric pressure is how many pascals?Read the answer and worked solution →Atmospheric pressure at a point equals the weight of what?Read the answer and worked solution →Up to what height is half of the atmosphere's mass found?Read the answer and worked solution →A cubic metre of sea-level air has a mass of about how much?Read the answer and worked solution →Which pair of atmospheric gases are greenhouse gases?Read the answer and worked solution →Without greenhouse gases, Earth's average surface temperature would be about what?Read the answer and worked solution →Which process makes the clear daytime sky look blue?Read the answer and worked solution →Why are clear nights colder than cloudy ones?Read the answer and worked solution →A mirage is caused by which property of air?Read the answer and worked solution →What is the study of Earth's atmosphere and its processes called?Read the answer and worked solution →

Worked practice questions

Which gas is the most abundant in dry air?

  1. Oxygen
  2. Nitrogen
  3. Argon
  4. Neon
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Correct answer: B. Nitrogen

1. Dry air is measured by the share of its molecules. 2. Nitrogen makes up about 78 percent of dry air. 3. Oxygen is next at about 21 percent, and argon and carbon dioxide are only small fractions. _Source: Wikipedia, Atmosphere of Earth, Lead section_

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Which gas forms about 21 percent of dry air?

  1. Nitrogen
  2. Argon
  3. Oxygen
  4. Neon
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Correct answer: C. Oxygen

1. Dry air has nitrogen, oxygen, argon and small trace gases. 2. Oxygen is about 20.95 percent of dry air. 3. Nitrogen is far higher at about 78 percent, and argon is under 1 percent. _Source: Wikipedia, Atmosphere of Earth, Lead section_

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After nitrogen and oxygen, which gas is the third most abundant in dry air?

  1. Hydrogen
  2. Methane
  3. Neon
  4. Argon
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Correct answer: D. Argon

1. List dry air gases by share: nitrogen 78.08, oxygen 20.95. 2. Argon follows at 0.93 percent. 3. Carbon dioxide is only 0.04 percent, and water vapour is not counted in dry air. _Source: Wikipedia, Atmosphere of Earth, Lead section_

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