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  1. Variation in duration of day and night is due to:
    1. rotation of earth on its axis
    2. revolution of earth around the sun
    3. inclination of earth at an angle of 66%.

    2. A.

     1and 2
    B.

     2 and 3
    C.

     1 and 3
    D.

     1, 2 and 3

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    Answer : Option B

    Explanation :

    Variation in duration of day and night is due to revolution of earth around the sun and inclination of earth at an angle of 66%.

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