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  1. Which of the following are true regarding ionosphere?
    I. It is the uppermost layer of atmosphere
    II. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized
    III. This layer is responsible for reflecting back the radio wave transmitted from the earth

    2. A.

     I and II
    B.

     I and II
    C.

     II and III
    D.

     I, II and III

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    Answer : Option C

    Explanation :

    The following that are true regarding ionosphere are The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized and This layer is responsible for reflecting back the radio wave transmitted from the earth.

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