Previous Year Paper year:2011 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2011

with Solutions - page 2

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#2-b [2]
In the diagram below, PQ is a ray of light incident on a rectangular glass
block.

#2-b-i
Copy the diagram and complete the path of the ray of light through
the glass block. In your diagram, mark the angle of incidence by
letter .i. and the angle of emergence by the letter .e..
Ans :

#2-b-ii
How are the angles .i. and .e. related to each other?
Ans : ∠i = ∠e

#2-c [2]
A ray of monochromatic light enters a liquid from air as shown in the
diagram given below.

Ans :

#2-c-i
Copy the diagram and show in the diagram the path of the ray of
light after it strikes the mirror and re-enters the medium of air.

#2-c-ii
Mark in your diagram the two angles on the surface of separation
when the ray of light moves out from the liquid to air.

#2-d [2]

#2-d-i
When does a ray of light falling on a lens pass through it undeviated?
Ans : When the ray is directed towards the optical centre.

#2-d-ii
Which lens can produce a real and inverted image of an object?
Ans : Convex lens.

#2-e [2]

#2-e-i
How is the refractive index of a medium related to its real depth and
apparent depth?
Ans :

#2-e-ii
Which characteristic property of light is responsible for the blue
colour of the sky?
Ans : Dispersion of light.

#3

#3-a [2]
When acoustic resonance takes place, a loud sound is heard. Why does
this happen? Explain.
Ans : When acoustic resonance takes place, the natural frequency of vibration of body is equal to the frequency of external force, so the body vibrations of the largest possible amplitude.
Since loudness &prop& Amplitude².
∴ A loud sound is heard.

#3-b [2]