Multiple choice

Consider the following statements regarding the atmosphere of the earth:

  1. It is enveloping the earth because of gravity
  2. Its density decreases with increasing height form the surface of the earth
  3. Its characteristic composition is same throughout its height
  4. Amount of pressure it exerts earth's surface at sea level is called one atmosphere Which of these statements are correct?

  1. 1 and 4

  2. 2 and 4

  3. 2, 3 and 4

  4. 1, 2 and 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement 1 is correct because Earth's gravity holds the atmosphere in place. Statement 2 is correct because atmospheric density decreases with altitude as gravity pulls more air molecules closer to the surface. Statement 3 is incorrect because atmospheric composition changes with altitude - while nitrogen and oxygen dominate near the surface, the upper atmosphere has different composition. Statement 4 is correct - standard atmospheric pressure at sea level is defined as one atmosphere.

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