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

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ICSE-X-Physics

Previous Year Paper year:2012

with Solutions - page 2

#1-e-ii
Why does the ball fly away?
Ans : Since P.E. is converted into K.E which transferred to the ball and makes the ball flyaway.

#2

#2-a [2]

#2-a-i
State the energy conversion taking place in a solar cell.
Ans : Solar energy to Electrical energy.

#2-a-ii
Give one disadvantage of using a solar cell. '
Ans : Solar cell is not a constant source of energy.

#2-b
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above
the ground. Find the loss in potential energy taking place in the body.
[``g=10 ms^{-2}``]
Ans :

#2-c [2]

#2-c-i
Define the term refractive index of a medium in terms of velocity of
light.
Ans : The absolute refractive index of a medium is defined as the ratio of the speed of light in vacuum (or air) to the speed of light in that medium i.e.,
$mu =frac { c }{ v }$

#2-c-ii
A ray of light moves from a rare medium to a dense medium as shown
in the diagram below. Write down the number of the ray which
represents the partially reflected ray.

Ans : Ray 2

#2-d [2]
You are provided with a printed piece of paper. Using this paper how will you
differentiate between a convex lens and a concave lens?
Ans : On moving the printed piece of paper before the lens, if the image is always diminished then it is a concave lens otherwise it is a convex lens.

#2-e [2]
A ray of light incident at an angle of incidence .i. passes through an
equilateral glass prism such that the refracted ray inside the prism is parallel
to its base and emerges from the prism at an angle of emergence .e..
Ans : (i) Angle of incident ∠i = Angle of emergence ∠e

#2-e-i
How is the angle of emergence .e. related to the angle of incidence .i.?

#2-e-ii
What can you say about the value of the angle of deviation in such a
situation?
Ans : The angle of deviation is the angle of minimum deviation.

#3

#3-a [2]