Previous Year Paper year:2015 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2015

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#
Board Paper 2015
ICSE Board
Class X Physics
Time: 2 hour Maximum Marks: 80
General Instructions:
1. Answers to this paper must be written on the paper provided separately.
2. You will not be allowed to write during the first 15 minutes. This time is to be spent in
reading the question paper.
3. The time given at the head of paper is the time allotted for writing the answers.
4. Attempt all questions from Section I and any four questions from Section II.
5. The intended marks of questions or parts of questions are given in brackets [ ].

# [40]
Section : I
Attempt all question from this Section.

#1

#1-a [2]
When a body is placed on a table top, it exerts a force equal to its weight downwards
on the table top but does not move or fall.

#1-a-i
Name the force exerted by the table top.
Ans : Normal reaction force.

#1-a-ii
What is the direction of the force?
Ans : It acts normal to the Surface of table top i.e., opposite to the direction of the force due to the weight of the body.

#1-b [2]

#1-b-i
Name one factor that affects the lateral displacement of light as it passes through
a rectangular glass slab.
Ans : The factors that affect the lateral displacement of a light as it passes through a rectangular glass slab are :
(1) The thickness of the glass slab: The lateral displacement increases with the increase in the thickness of the glass slab.
(2) The angle of incidence: It increases with the increase in the angle of incidence.
(3) The refractive index of glass: The wavelength of light used. (It is more for violet light than for the red light.) (any one)

#1-b-ii
On reversing the direction of the current in a wire, the magnetic field produced
by it gets ____________.
Ans : 'Reversed'.

#1-c [2]

#1-c-i
On what factor does the position of the centre of gravity of a body depend?
Ans : The position of centre of gravity of a body of given mass depends on its shape i.e., on the distribution of mass in it.

#1-c-ii
What is the SI unit of the moment of force?
Ans : S.I. unit of the moment of force is Newton x meter.

#1-d [2]
Name the factors affecting the turning effect of a body.
Ans : The factors affecting turning effect of a body:
1. The magnitude of a force applied.
2. The distance of line of action of the force from the axis of rotation.

#1-e [2]

#1-e-i
Define equilibrium.
Ans : When a number of forces acting on a body produce no change in its state of rest or of the motion, the body is said to be in equilibrium.