1. [A] Light is least scattered. All we know that the Sun is directly over the head and sunlight travel relatively shorter distance causing only little of the blue and violet colours to be scattered.

    [A] Light is least scattered.
    All we know that the Sun is directly over the head and sunlight travel relatively shorter distance causing only little of the blue and violet colours to be scattered.

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  2. [B] Scattering of light Red colour scatters the least so that it travels the farthest. During sunset or sunrise, light has to travel a longer distance to reach us. The sky appears reddish as when only red light reaches to us. Hence, you should go with the option [B].

    [B] Scattering of light
    Red colour scatters the least so that it travels the farthest. During sunset or sunrise, light has to travel a longer distance to reach us. The sky appears reddish as when only red light reaches to us. Hence, you should go with the option [B].

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  3. [D] Steel We know that steel is an alloy of iron and carbon. Mixing of carbon gives strength to iron. Your answer will be option [D].

    [D] Steel
    We know that steel is an alloy of iron and carbon. Mixing of carbon gives strength to iron. Your answer will be option [D].

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  4. [A] chromosomes Animal cells lacking nuclei would also lack in chromosomes because chromosomes are present in nucleus only.

    [A] chromosomes
    Animal cells lacking nuclei would also lack in chromosomes because chromosomes are present in nucleus only.

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