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Kusum Joshi

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  1. Asked: May 8, 2021In: Class 10 Science

    At noon the sun appears white as

    Best Answer
    Kusum Joshi
    Added an answer on December 14, 2021 at 6:22 am

    [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. Asked: May 5, 2021In: Class 10 Science

    Twinkling of stars is due to atmospheric

    Kusum Joshi
    Added an answer on December 14, 2021 at 6:21 am

    [B] Refraction of light by different layers of varying refractive indices We must know that air have different layers which act as varying refractive indices and when light enters by different layers of the apparent position of source of light keeps on changing. It happens due to refraction of lightRead more

    [B] Refraction of light by different layers of varying refractive indices
    We must know that air have different layers which act as varying refractive indices and when light enters by different layers of the apparent position of source of light keeps on changing. It happens due to refraction of light. So, stars appear to twinkle.

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  3. Asked: May 5, 2021In: Class 10 Science

    Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

    Best Answer
    Kusum Joshi
    Added an answer on December 14, 2021 at 6:21 am

    [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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  4. Asked: June 9, 2021In: Class 10 Science

    Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents ?

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    Kusum Joshi
    Added an answer on December 7, 2021 at 9:36 am

    [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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  5. Asked: May 27, 2021In: Class 9 Science

    Animal cell lacking nuclei would also lack in

    Best Answer
    Kusum Joshi
    Added an answer on November 24, 2021 at 11:49 am

    [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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