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ICSE-X-Physics

Previous Year Paper year:2019

with Solutions - page 6

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  • #7-b
    A pendulum has a frequency of 4 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum. If the velocity of sound in air is 340 m s1, find the distance between the cliff and the observer.

    [3]
    Ans : Given f= 4 vbs, T = ``\frac { 1 }{ f }`` = ``\frac { 1 }{ 4 }`` = 0.25 s, for a frequency of 6 vbs titme t= ``\frac { 0.25 }{ 4 }`` x 6 = 0.375 s, ,V=340ms-1

    Using S = ``\frac{\mathbf{V} \times t}{2}`` = ``\frac{340 \times 0.375}{2}`` = 63.75 m


  • #7-c
    Two pendulums C and D are suspended from a wire as shown in the given figure. Pendulum C is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating.


  • #7-c-i
    Name the type of oscillation, C will execute.
    Ans : Free or natural oscillation.
  • #7-c-ii
    Name the type of oscillation, D will execute.
    Ans : Forced oscillation.
  • #7-c-iii
    If the length of D is made equal to C, then what difference will you notice in the oscillations ofD?
    Ans : The amplitude of the oscillation of D will be equal to the amplitude of the oscillation of C.
  • #7-c-iv
    WHat is the name of the phenomenon when the length of D is made equal to C?

    [4]
    Ans : Resonance.


  • #8
  • #8-a
  • #8-a-i
    Write one advantage of connecting electrical appliances in parallel combination.
    Ans : All appliances will continue to work even if one of the appliance does not work.
  • #8-a-ii
    What characteristics should a fuse wire have?
    Ans : High resistivity and low melting point.
  • #8-a-iii
    Which wire in a power circuit is connected to the metallic body of the appliance?

    [3]
    Ans : The ground wire.


  • #8-b
    The diagram below shows a dual control switch circuit connected to a bulb.


  • #8-b-i
    Copy the diagram and complete it so that the bulb is switched ON.
    Ans : The diagram is as shown :


  • #8-b-ii
    Out of A & B which one is the live wire and which one is the neutral wire?
    Ans : A is connected to the live wire and B to neutral wire.


  • #8-c
    The diagram shows a circuit with the key k open.



    Calculate:
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