Q113 / 180 · AIIMS 2002 · Physics

Assertion : The earth without its atmosphere would be inhospitably cold. Reason : All heat would escape in the absence of atmosphere.

  • Correct answer
    A
    If both the assertion and reason are true and reason is a correct explanation of the assertion.
  • B
    If both assertion and reason are true but assertion is not a correct explanation of the assertion.
  • C
    If the assertion is true but the reason is false.
  • D
    If both assertion and reason are false.

Solution

Heat radiated out by earth is reflected back by the atmosphere. In the absence of atmosphere, all the heat will escape from earth's surface which will make the earth inhospitably cold. The atmosphere helps in maintaining the temperature through convection of heat.

Hence, the correct answer is option: 'A'.

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