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Light Test - 27

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Light Test - 27
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Weekly Quiz Competition
  • Question 1
    1 / -0
    When light is incident on a polished surface ___________ reflection takes place.
    Solution
    Regular reflection takes place when a light beam is incident on a smooth surface which is highly polished.
  • Question 2
    1 / -0
    The human eye part which can be used again and again for forming different images is called
    Solution
    Retina is a part of human eye which act as a screen with photo receptor where image will be formed and signal will be sent to the brain.

  • Question 3
    1 / -0
    The phenomenon of splitting of light into its component colours is _________.
    Solution
    When white light passes through the prism it gets dispersed into seven colours called spectrum.The phenomenon of splitting of light into its component colours is called dispersion.
  • Question 4
    1 / -0
    Which of the following is not a luminous object?
    Solution
    Objects which do not emit light of their own are called  $$ \bf{non-luminous} $$ objects.
    Objects that give out or emit light of their own are called as $$ \bf{luminous\ objects} $$.

    Moon is a non-luminous object because it does not emit its own light and glows by reflecting the light of the sun.
    Sun, Bulb and candle emit their own light and hence, are luminous objects.

    Hence, the correct answer is OPTION B.
  • Question 5
    1 / -0
    Periscope is built using the concept of
    Solution
    Periscope works on the principle of multiple reflections of light. It consists of two mirrors. Lights rays fall on one mirror, get reflected, fall on the other mirror, and get reflected again.

    Answer-(B)

  • Question 6
    1 / -0
    Which instrument is used to see around corners ?
    Solution

    Periscope is the instrument used to see around corners.

    Answer-(C)

  • Question 7
    1 / -0
    White light is a mixture of:
    Solution
    White light is made up of seven colors namely Violet, Indigo, Blue, Green, Yellow, Orange, Red commonly remembered by using the acronym $$VIBGYOR$$. 

    Hence, option $$A$$ is the correct answer.
  • Question 8
    1 / -0
    The height of the image formed by an object of height $$10 cm$$ placed in front of a plane mirror is ________.
    Solution
    If an object is placed in front of a plane mirror, the size of the object remains same. This is the property of plane mirror. So the height of the object will be $$10 cm$$ only.
  • Question 9
    1 / -0
    Periscope can not be made with
    Solution

    The periscope is based on successive reflection of light. It is built with the help of two mirrors. So, it can't be built with 1 mirror.

    Answer-(A)

  • Question 10
    1 / -0
    Which type of reflection will be represented by a light reflected from a book?
    Solution
    Irregular
    A book has an irregular surface, hence a parallel beam incident on it does not remain parallel but spreads over wide region after reflection.
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