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10th Class Science Human Eye and Colourful World Question Bank The Human Eye and the Colourful World

  • question_answer
    Why are the red danger signals visible even though there is thick fog or smoke?
    (i) It has least wavelength
    (ii) It has longer wavelength
    (iii) It scatters the least

    A)  Only (ii)

    B)  Only (i) and (ii)

    C)  Only (i) and (iii)

    D)  Only (ii) and (iii)

    Correct Answer: D

    Solution :

    The red danger signals are visible red even from a long distance because it has longer wavelength and so it is scattered the least. Due to this reason even in thick fog or smoke, the danger signals appear red.


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