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ICSE-X-Physics

Previous Year Paper year:2019

with Solutions - page 3

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  • #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.
  • #3-b-ii
    frequencies?

    [2]
    Ans : Ratio of frequencies will be 1:1.


  • #3-c
    How does an increase in the temperature affect the specific resistance of a :
  • #3-c-i
    Metal and
    Ans : Increases.
  • #3-c-ii
    Semiconductor?

    [2]
    Ans : Decreases.


  • #3-d
  • #3-d-i
    Define resonant vibrations.
    Ans : If a body is made to vibrate with its fundamental frequency by an external source, then the vibrations are called resonant vibrations.
  • #3-d-ii
    Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him ?

    [2]
    Ans : Quality.


  • #3-e
    Is it possible for a hydrogen (11H) nucleus to emit an alpha particle? Give a reason for your answer.

    [2]
    Ans : No, as it does not possess a helium nucleus.


  • #4
  • #4-a
    Calculate the effective resistance across AB :


    Ans : Resistors of 5 Ω and 4 Ω are in series, therefore, their net resistance is Rs = 5 + 4 = 9 Ω.

    Now, this 9 Cl and 3 Ω are in parallel, hence net resistance RP = ``\frac{9 \times 3}{9+3}`` = ``\frac { 18 }{ 12 }`` = 1.5 Ω.

    Now, this is in series with the 8 Cl resistor, hence net resistance of the circuit is RT = 8 + 1.5 = 9. 5


  • #4-b
  • #4-b-i
    State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid.
    Ans : No, specific heat capacity does not remain the same when it changes from solid to liquid.
  • #4-b-ii
    Give one example to support your answer.

    [2]
    Ans : Let us take the example of water.

    Specific heat capacity of water = 4.2 J kg-1 K-1

    and specific heat capacity of ice = 2.1 J kg-1K-1


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