Previous Year Paper year:2010 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2010

with Solutions - page 2

#2-a [2]

#2-a-i
Why is the mechanical advantage of a lever of the second order
always greater than one?
Ans : ∴ Effort arm > Load arm.

#2-a-ii
Name the type of single pulley that has a mechanical advantage
greater than one?
Ans : Single movable pulley.

#2-b [2]

#2-b-i
What is meant by refraction of light?
Ans : The deviation in the path of light when it travels from one medium to the other is called refraction of light.

#2-b-ii
What is the cause of refraction of light?
Ans : Speed of light is different in different mediums.

#2-c [2]
.The refractive index of diamond is 2.42..
What is meant by this statement?
Ans : It means that the ratio of speed of light in air to the speed of light in diamond is 2.42.

#2-d [2]
We can burn a piece of paper by focusing the sun rays by using a
particular type of lens.

#2-d-i
Name the type of lens used for the above purpose.
Ans : Convex lens.

#2-d-ii
Draw a ray diagram to support your answer.
Ans :

#2-e [2]
A ray of light enters a glass slab PQRS, as shown in the diagram. The
critical angle of the glass is 42°. Copy this diagram and complete the
path of the ray till it emerges from the glass slab.
Mark the angles in the diagram wherever necessary.

Ans :

#3

#3-a [2]

State two differences between light waves and sound waves.

Ans : Difference between Sound waves and Light waves :

Sound Waves	Light Waves
1. These are mechanical waves. They require medium for propagation.	1. These are electromagnetic waves. They can travel in vacuum.
2. These are longitudinal waves.	2. These are transverse waves.

#3-b [2]
Two waves of the same pitch have their amplitudes in the ratio 2:3.

#3-b-i
What will be the ratio of their loudness?
Ans : ∴ Loudness &prop& (Amplitude)²