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

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ICSE-X-Physics

Previous Year Paper year:2012

with Solutions - page 5

#5-c-i
A moving body weighing ``\pu{400 N}`` possesses ``\pu{500 J}`` of kinetic energy.
Calculate the velocity with which the body is moving. (``g = 10 m//s^2``)
Ans :

#5-c-ii
Under what condition will a set of gears produce
l. a gain in speed
2. a gain in torque.

Ans : (1) For gain in speed: No. of teeth in driving wheel is greater than no. of teeth in driven wheel.
(2) For gain in torque: No. of teeth in driven wheel is greater than no. of teeth in driving wheel.

#6

#6-a [3]

#6-a-i
What is meant by the term .critical angle'?
Ans : Critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is 90°.

#6-a-ii
How is it related to the refractive index of the medium?
Ans : _aμ^g = cosec i_c where i_c in the critical angle.

#6-a-iii
Does the depth of a tank of water appear to change or remain the same
when viewed 'normally from above?
Ans : Depth remain the same. Apparent depth = Actual depth.

#6-b [3]
A ray of light PQ is incident normally on the hypotenuse of a right angled
prism ABC as shown in the diagram given below:

#6-b-i
Copy the diagram and complete the path of the ray PQ till it emerges
from the prism.
Ans :

#6-b-ii
What is the value of the angle: of deviation of the ray?
Ans : Angle of deviation (.) = 180°

#6-b-iii
Name an instrument where this action of the prism is used.
Ans : Prism binocular.

#6-c [4]
A converging lens is used to obtain an image of an object placed in front of it.
The inverted image is formed between ``F_2`` and ``2F_2`` of the lens.

#6-c-i
Where is the object placed?
Ans : Object is beyond 2F₁.

#6-c-ii
Draw a ray diagram to illustrate the formation of the image obtained.

Ans :

#7