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  1. Instrument for measuring blueness of the sky or ocean is called ________

    2. A.

     Bathymeter
    B.

     Ceraunograph
    C.

     Cyanometer
    D.

     Barometer

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    Answer : Option C

    Explanation :

    A cyanometer (from cyan and -meter) is an instrument for measuring "blueness", specifically the colour intensity of blue sky.

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