Read the assertion and reason carefully to mark the correct option out of the options given below.
Assertion: Earth has an atmosphere but the Moon does not.
Reason : Gases in the atmosphere is completely escaped from the moon
A
If both assertion and reason are true and the reason is the correct explanation of the assertion
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B
If both assertion and reason are true but reason is not the correct explanation of the assertion
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C
If assertion is true but reason is false
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D
If assertion is false but reason is true
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Solution
The correct option is B If both assertion and reason are true but reason is not the correct explanation of the assertion As gravity of the Moon is very less then the Earth (16th of the Earth), so escape velocity of the Moon is much less when compared to the escape velocity of the Earth, so gases in the atmosphere is completely escaped from the Moon. And gravity depends on mass of planet, not its volume.