## SAMPLE PAPER Class - X I Subject - Physics (Theory)

**SAMPLE PAPER**

#
Class -
X I

**Subject - Physics (Theory)**

## Time: 3 hours Max . Marks 70

__General Instructions__*1.*

*All questions are compulsory. Symbols have their usual meaning.*

*2.*

*Q.No. 1 to 8 are of very short answer type questions, carrying 1 mark each.*

*3.*

*Q.No.9 to 18 are of short answer type questions, carrying 2 marks each.*

*4.*

*Q. No. 19 to 27 carry 3 marks each.*

*5.*

*Q. No. 28 to 30 carry 5 marks each.*

*6.*

*Use of calculator is not permitted. However you may use log table, if required.*

*7.*

*Draw neat labelled diagram wherever necessary to explain your answer*

**To read this file click here ...........**

*.*

- What does speedometer of a car indicates?
- Write down the dimensions of viscosity coefficient.
- What is the effect on viscosity of gases when temperature is increased?
- A light body and heavy body have equal momentum, which one have greater kinetic energy?
- Why do we use ball –bearings?
- State Newton’s universal law of gravitation and express it in vector form.

7.
Calculate the moment of inertia of a uniform ring of mass

*500 g*and radius*10*cm, about its diameter.

8. What would be
the excess pressure inside a water bubble of radius 0.2 mm?

Surface
tension of water atC is 0.

*72 X*N/m
9. How errors are
combine in following mathematical operations of physical quantities?

i) Subtraction ii) Product

10. Draw the Velocity – Time graph for following
cases when

i) Object is moving in positive direction
with acceleration

ii)
An object is under free fall

11. Find the
torque of a force 7

**i**+3**j**-5**k**about the origin. The force acts on a particle
whose position vector is

**i**-**j**+**k**.
12. Derive the
necessary relation for safest velocity of an automobile on a banked road of

radius

**and friction coefficient .***r*
13. The escape
velocity (

**v**) of a body depends upon the mass (**) of body, gravitational***m*
acceleration (

**) and radius(***g***) of the planet .Derive the relation for escape velocity dimensionally.***R*
14. State and Prove
Work- Energy Theorem.

15. Derive the
necessary relation for orbital velocity of a satellite and prove that

*using it.*

16. What do you
mean by positive, negative and Zero work done .Give at least one

example of each case.

OR

Prove
that mechanical energy remains conserved during motion when a body of mass

**is dropped from a height**

*m*

*h*.
17. Two masses 8
kg and 12 kg are connected at the two ends of an inextensible string

that passes over a frictionless pulley.
Find the acceleration of the masses and tension

in the string when masses are released.

18. Two bodies of
masses (), moving with initial velocities

, along a straight line in the same direction, suffer perfect
head on collision.

Find
their velocities after collision.

19. State Hooke’s
law. Explain Stress – Strain curve of a
material when subjected under

extended load.

20. State
Parallelogram law of vector addition. Find the magnitude and direction of the

resultant of two vectors

**A**and**B**in terms of their magnitudes and angle between
them.

21. Explain
following with proper reason (any two)

a) Why blood pressure in humans is greater
at the feet than at brain.

b) Water wets the glass surface
while mercury does not.

c) The dome of water reservoir thick
at bottom.

22. What do you
mean by acceleration due to gravity? What are the factors affect the

value of

**? Derive the necessary relation for variation of***g***with depth.***g*
23. State Stokes’
law and derive the expression for critical velocity in case of a sphere

falling through a viscous fluid like
Glycerine.

24. Suggest some
ways to minimize friction.

OR

Explain why it is easier to pull a
roller than to push it.

25. State Newton’s laws of motion with
at least one
example of each.

26. Define Centre
of mass. A body projected into space explodes. What will be the nature

of path of its core?

27. If Earth were suddenly shrink to ½ of its
present radius without change in mass,

what is the effect on duration of day?

28. a) Derive the
equation S = ut + ½ using graphical
method.

b) A ball is thrown vertically upward
with a velocity 20 m/s from the top of a

multistory building. The height of the
point from where the ball is thrown is 25 m

from the ground, i) How
high the ball rise? ii) With what
velocity strike the

ground ?

OR

A projectile is fired in air making an
angle with horizontal. Show
that

i) Its path is parabolic in
nature. ii)

**where H is maximum height***tan = 4H / R*
attained and R is the range of projectile.

29. a) Three
bodies a ring, a solid cylinder and a solid sphere, having identical
radius,

roll down the same inclined plane
without slipping .They start from rest.
Which of

the three reaches the ground with?

i)
Maximum velocity ii) minimum
velocity

b) State Theorem of Parallel Axes.

OR

a)
State and prove Angular momentum Conservation principle.

b) Explain how an acrobat in circus
takes advantage of it.

30. a)
State Pascal’s law. How it can be
used in Hydraulic lift.

b) The density of the atmosphere at sea
level is 1.3 kg /. Assume that it does not change

with altitude, then how high would the
atmosphere extend?

OR

State and prove Bernoulli’s
theorem. Explain any one application of it.

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