Previous Year Paper year:2019 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2019

with Solutions -

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Answers to this Paper must he written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to he spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section I is compulsory. Attempt any four questions from Section II.
The intended marks for questions or parts of questions are given in brackets

[ ].

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Section : I
[40 Marks]

(Attempt all questions from this Section)

#1

#1-a
The diagram below shows a claw hammer used to remove a nail:

#1-a-i
To which class of lever does it belong ?
Ans : Class One.

#1-a-ii
Give one more example of the same class of lever mentioned by you in (i) for which the mechanical advantage is greater than one.
Ans : Shears used for cutting the thin metal sheets.

#1-b
Two bodies A and B have masses in the ratio 5:1 and their kinetic energies are in the ratio 125:9. Find the ratio of their velocities.

[2]

Ans : Given

Kinetic energy is given by K = ``\frac { 1 }{ 2 }`` mv²

Therefore,

#1-c

#1-c-i
Name the physical quantity which is measured in calories
Ans : Heat energy.

#1-c-ii
How is calorie related to the SI unit of that quantity?

[2]

Ans : 1 cal = 4.2 J.

#1-d

#1-d-i
Define couple.
Ans : It is defined as a set of two equal and opposite forces acting along different lines

of action.

#1-d-ii
State the SI unit of moment of couple.

[2]

Ans : SI unit is N m.

#1-e

#1-e-i
Define critical angle.
Ans : It is the angle of incidence in the denser medium for which angle of refraction in the rarer medium is 90°.