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

Home Learn Fast select Course

Change Unit Change Subject Last Menu

ICSE-X-Physics

Previous Year Paper year:2013

with Solutions - page 2

Note: Please signup/signin free to get personalized experience.

Note: Please signup/signin free to get personalized experience.

10 minutes can boost your percentage by 10%

Note: Please signup/signin free to get personalized experience.

#2-a

#2-a-i
In what way does an 'Ideal machine' differ from a 'Practical machine'?
Ans : The efficiency of an ideal machine (free from friction etc) is equal to 1. But in actual practical, the efficiency is less than 1 due to the energy loss in friction.

#2-a-ii
Can a simple machine act as a force multiplier and a speed multiplier at the same
time?
Ans : No.

#2-b
A girl of mass ``\pu{35 kg }`` climbs up from the first floor of a building at a height 4 m above
the ground to the third floor at a height 12 m above the ground. What will be
increase in her gravitational potential energy? (g = ``\pu{10 m//s^2}``
Ans : Gravitational potential energy at 1st floor = mgh₁
= 35 x 10 x 4 = 1400 J
Potential energy at third floor = mgh₂
= 35 x 10 x 12 = 4200 J
Increase in potential energy = 4200 - 1400 = 2800 Joule.

#2-c
Which class of lever found in the human body is being used by a boy

#2-c-i
When he holds a load on the palm of his hand.
Ans : Class III lever

#2-c-ii
When he raises the weight of his body on his toes?
Ans : Class II lever.

#2-d
A ray of light is moving from a rarer medium to denser medium and strikes a plane
mirror placed at 90° to the direction of the ray as shown in the diagram.

#2-d-i
Copy the diagram and mark arrows to show the path of the ray of light after it is
reflected from the mirror.
Ans :

#2-d-ii
Name the principle you have used to mark the arrows to show the direction of
the ray.
Ans : Principle of reversibility of light.

#2-e
Ans : (i)

#2-e-i
The refractive index of glass with respect to air is 1.5. What is the value of the
refractive index of air with respect to glass?

#2-e-ii
A ray of light is incident as a normal ray on the surface of separation of two
different mediums. What is the value of the angle of incidence in this case?

Ans : Angle of incidence = 0°.

#3 [10]

#3-a
A bucket kept under a running tap is getting filled with water. A person sitting at a
distance is able to get an idea when the bucket is about to be filled.