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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]
  • #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.



    (b)``\frac { 5 }{ 3 }``



    Therefore, We have





    (c) Substance B. Because it requires relatively little heat to raise its temperature.



    (d) The pitch will decrease, as the pitch is inversely proportional to the length of the vibrating air column.



    (e) The path of ray is as shown:




  • #2-b
    (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)

    (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]
  • #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]
  • #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]
  • #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]




  • #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.


  • #3-b
    Two waves of the same pitch have amplitudes in the ratio 1 : 3.

    What will be the ratio of their:
  • #3-b-i
    intensities and
    Ans : Ratio of intensities will be 1: 9.
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