Previous Year Paper year:2013 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2013

with Solutions - page 3

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#3-a-i
What change takes place in the sound to give this idea?
Ans : The frequency of sound appear to be increase ( $fpropto frac { 1 }{ l }$ ).

#3-a-ii
What causes the change in the sound?
Ans : Because air column is decreased on the filling the water in bucket.

#3-b
A sound made on the surface of a lake takes 3 s to reach a boatman. How much time
will it take to reach a diver inside the water at the same depth?
Velocity of sound in air = ``\pu{330 m//s}``
Velocity of sound in water = ``\pu{1450 m//s}``
Ans :

#3-c
Calculate the equivalent resistance between the points A and B for the following
combination of resistors:

Ans :
Resistance between A and B, R = 5 + 2 + 6 = 13Ω
Hence, Equivalent resistance between A and B = 13Ω

#3-d
You have been provided with a solenoid AB.

#3-d-i
What is the polarity at end A?
Ans : North pole.

#3-d-ii
Give one advantage of an electromagnet over a permanent magnet.
Ans : The magnetic field strength can be change in electromagnet. But not in permanent magnet.

#3-e

#3-e-i
Name the device used to protect the electric circuits from overloading and short
circuits.
Ans : (i) Electric fuse

#3-e-ii
On what effect of electricity does the above device work?
Ans : Heating effect of electrical current.

#4

#4-a
Define the term 'Heat capacity' and state its S.I. unit.
Ans : Heat Capacity: The amount of heat required to increase 1 °C temperature of whole body is called heat capacity.
SI unit of heat capacity = Joule/Kelvin

#4-b
What is meant by Global warming?
Ans : Global Warming: An increase in the average effective temperature of earth's surface due to an increase in the amount of green house gases in its atmosphere is called Global Warming.

#4-c
How much heat energy is released when 5 g of water at 20° C changes to ice at 0° C
[Specific heat capacity of water = ``\pu{4.2 J g-1 °C-1 }``
Specific latent heat of fusion of ice = ``\pu{ 336 J g-1 }`` ]
Ans : Heat energy = mc △T + mL
= 5 x 4 - 2 x 20 + 5 x 336 = 420 + 1680 = 2100 Joule.

#4-d
Which of the radioactive radiations