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  1. Radio waves sent out by a radio stations are reflected by

    2. A.

     Troposphere
    B.

     Stratosphere
    C.

     Mesosphere
    D.

     Ionosphere

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    Answer : Option D

    Explanation :

    This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.

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