Civil Services Prep

Prelims 2024 · Geography · Question 51

Consider the following statements: Statement-I: The atmosphere is heated more by incoming solar radiation than by terrestrial radiation. Statement-II: Carbon dioxide and other greenhouse gases in the atmosphere are good absorbers of long wave radiation. Which one of the following is correct in respect of the above statements?

  1. Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
  2. Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
  3. Statement-I is correct, but Statement-II is incorrect
  4. Statement-I is incorrect, but Statement-II is correct

Answer

Statement-I is incorrect, but Statement-II is correct

Statement-I: Incorrect. The atmosphere is heated mainly from below by terrestrial long-wave radiation emitted by the Earth's surface, not directly more by incoming solar radiation.
Statement-II: Correct. CO2, water vapour, methane and other greenhouse gases are good absorbers of outgoing long-wave terrestrial radiation.
Option check: Since Statement-I is false and Statement-II is true, the correct answer is (d).

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