Class – X
Subject : Physics
Time : 2 hrs. Marks. 50
(The figures in the
margin indicate full marks. Answer any five questions from group A and any five
questions from group B.)
1. What is
meant by S.I unit? What is fundamental unit. 1+1
2. Establish
the relation among displacement, acceleration and final velocity. 2
3. How the
hydroelectricity is produced and how the transformation of energy takes place 2
in the
process Explain.
4. Define in
the case of wave - 2
i) Time period ii) Frequency iii) Amplitude iv) phase
5. What is the
difference between heat capacity and specific heat. 2
6. What is an
Otto cycle? Which is the working stroke. 1+1
7. What is
meant by a lens? Why a convex lens is called a converging lens. 1+1
8. What is
meant " by 220 V and 60 W"? 2
9. What is a
transistor? How does a transistor amplify? 1+1
10. What is
radioactivity? 2
Group B
11. a) From Newton's second law of motion prove the F =ma 4
b) Show that if a body is projected
vertically upward with initial velocity of half of
the value
g, it will fall on the surface of the earth after 1 sec. 2
12. a) What do you understand by the
transformation of energy? Give some examples of
transformation
of energy.
b) A car starting from rest moves with
uniform acceleration and travels the 1st kilometer in 4 minutes. If the car moves with uniform velocity after this,
how long will it take to travel the second
kilometer. 2
13. a) What do you understand by acceleration
due to gravity? Experimentally determine the
value of
acceleration due to gravity at a place using a simple pendulum. 4
b) An engine of power 20 km can lift 3000
kg of water at a vertical height of 10m in 1 2
minute find
(a) output effective energy (b) power output and (c) efficiency of the engine.
14. a) Give a mathematical explanation of
Pascal's law for the transmission of
fluid pressure. 4
b) What will be the co-efficient of real
expansion of mercury when its co-efficient of apparent
expansion
with respect to glass is 14.66x10-5 K-1 and co-efficient
of linear expansion of glass is
0.0000 1 K -1
? 2
15. a) What do you mean by Otto cycle? Explain
with diagram the actions of four strokes of a 4
petrol
engine.
b) Find how much kilogram of ice will
melt. The thormal conductivity of lead is 35 W m-1
K-1
and relative latent heat of fusion of ice is 3.36 x1-5 JKg -1.2 .
16. a) Describe electromagnetic theory of
light what is the reason of putting up theory of light? 4
Give brief
description of this theory.
b) Three lamps of equal luminous intensity
are placed at a distance 3 m and exactly two such
lamps are
placed at a distance 2m. Which will be more illuminated. 2
17. a) What are the characteristics of a good
plane mirror? Prove that for a particular ray incident
on a plane
mirror the angle of rotation of the reflected ray is twice the angle of
rotation of the
mirror.
4
b) If velocity of light in vacuum is 3x108
m/s then. Find the velocity of light in water,
refractive
index of water 1.33. 2
18. a) What are the principal defects of
vision with ray diagram, explain how can they be remedied. 4
b) What do you mean by accommodation of
eye? The least distance of distinct vision of a man
is 25 cm.
What does it mean. 2
19. a) What is resistance? State and explain
the laws of resistance. Define specific resistance and
give its
mathematical expression 4
b) If a charge of 30 coulombs is placed in
an electric field it gains a force of 15 Newton's
if a chare
of 20 Coulombs is placed at that point, what will be the force? 2
20. a) What is a p -n junction? Why is it
called a p-n Junction diode? How does it work as a
rectifier. 4
b) Describe in detail the domain theory of
magnetism. 2
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