Previous Year Paper year:2012 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2012

with Solutions - page 3

#3-a-i
What is meant by .Dispersion of light.?
Ans : The phenomenon of splitting of white light of a prism into its constituent colours is called dispersion of light.

#3-a-ii
In the atmosphere which colour of light gets scattered the least?
Ans : Red colour.

#3-b [2]
Which characteristic of sound will change if there is a change in

#3-b-i
its amplitude
Ans : Loudness.

#3-b-ii
its waveform.
Ans : Quality or Timbre.

#3-c [2]

#3-c-i
Name one factor which affects the frequency of sound emitted due to
vibrations in an air column.
Ans : Length of air column.

#3-c-ii
Name the unit used for measuring the sound level.
Ans : Decibel

#3-d [2]
An electrical appliance is rated at ``\pu{ 1000 KVA , 220 V }`` .
[if the appliance is
operated for 2 hours, calculate the energy consumed by the appliance in:

#3-d-i
kWh (ii) joule
Ans : Let Energy consumed = Power x Time
= 1000 x 2 = 2000 kWh
(ii) Since 1 kWh = 3.6 x 10⁶ J
Energy consumed = 2000 x 3.6 x 10⁶ J
= 7.2 x 10⁹ J.

#3-e [2]
Calculate the equivalent resistance between P and Q from the following
diagram:

Ans : The two 10. resistors are in series and they are parallel to the 5. resistor.

#4

#4-a [2]

#4-a-i
What is an a.c. generator or Dynamo used for?
Ans : An a.c. generator or Dynamo is used to convert mechanical energy to electrical energy.

#4-a-ii
Name the principle on which it works.
Ans : Faraday's law of Electromagnetic induction.