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ICSE-X-Physics

Previous Year Paper year:2019

with Solutions - page 2

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  • #1-e-ii
    State one important factor which affects the critical angle of a given medium.

    [2]
    Ans : Nature of the two media in contact.


  • #2
  • #2-a
    An electromagnetic radiation is used for photography in fog.
  • #2-a-i
    Identify the radiation.
    Ans : Infrared radiation
  • #2-a-ii
    Why is this radiation mentioned by you, ideal for this purpose?

    [2]
    Ans : Because it can penetrate fog.
  • #2-b
  • #2-b-i
    What is the relation between the refractive index of water with respect to air(aμw) and the refractive index of air with respect to water (wμa)
    Ans :
  • #2-b-ii
    If the refractive index of water with respect to air (aμw) is ``\frac { 5 }{ 3 }``. Calculate the refractive index of air with respect to water (wμa)

    [2]
    Ans : Given (aμw) = ``\frac { 5 }{ 3 }``

    Therefore, We have




  • #2-c
    The specific heat capacity of a substance A is 3,800 J kg-1K-1 and that of a substance B is 400 J kg-1K-1. Which of the two substances is a good conductor of heat? Give a reason for your answer.

    [2]
    Ans : Substance B. Because it requires relatively little heat to raise its temperature.


  • #2-d
    A man playing a flute is able to produce notes of different frequencies. If he closes the holes near his mouth, will the pitch of the note produced, increase or decrease? Give a reason.

    [2]
    Ans : The pitch will decrease, as the pitch is inversely proportional to the length of the vibrating air column.


  • #2-e
    The diagram below shows a light source P embedded in a rectangular glass block ABCD of

    critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles.]

    [2]




    Ans : The path of ray is as shown:




  • #3
  • #3-a
  • #3-a-i
    If the lens is placed in water instead of air, how does its focal length change?
    Ans : Its focal length increases.
  • #3-a-ii
    Which lens, thick or thin has greater focal length?
    [2]
    Ans : Thin lens.


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