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UV rays are prevented from entering t...

UV rays are prevented from entering the earth's atmosphere by :

A

Oxygen

B

Nitrogen

C

Ozone

D

Carbon dioxide

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Knowledge Check

  • A: The electrical. Conductivity of the Earth's atmosphere does not change with altitude. R : Cosmic rays from outer space entering the earth's atmosphere do not affect it.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
    C
    If assertion is true statement but Reason is false, then mark (3)
    D
    If both Assertion and Reason are false statements, then mark (4)

  • The graph below shows variation of refractive index of earth's atmosphere with altitude. Select the correct observations: (I) The refractive index of earth is gradually increasing with decrease in altitude (II) Star tight will get scattered more on entering the earth's atmosphere before reaching earth's surface. (III) Star light will get bend more away from the normal as it reaches the earth's surface. (IV) Star light will get bend more towards the normal as it reaches the earth's surface.

    A
    Both (I) and (II)
    B
    Both (I) and (IV)
    C
    Both (II) and (III)
    D
    Both (II) and (IV)

  • The outermost layer of the Earth's atmosphere is

    A
    the stratosphere
    B
    the mesosphere
    C
    the troposphere
    D
    the ionosphere

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