11TH PHYSICS 1ST TERM
EXAM
MM
50 TIME
3 HRS
NOTE:
-
Question no. 1 to 20 one mark
each,
21 to 29
two marks each,
30 to 33
three marks each.
1. While you
try to take next step, which force plays the key role, in helping you?
(a) Gravitational
force (b)Electrostatic
force
(c)
Electromagnetic force (d)
None of the above
2. When a
football is kicked high towards another player in the ground, what is the velocity of the football at the highest point of its path?
(a) Always
zero (b)
Sometimes zero
(c) Always
non zero (d) Sometimes non zero
3. What should
a person on a freely rotating turn table do to decrease
his (angular) speed?
(a) Bring
his hands together (b) Raise his
hands up
(c) Spread
his hands outwards (d) Sit down with
raised hands
4. A boy
sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls
(a) behind
him (b) in
front of him
(c)into
his hand (d)
by his side
5. A body is
initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to
a)
c)
6. A student
is caries a bag weighing 5 kg from the ground floor
to his class on the first floor that is 2 m high. The work done by the boy is
(a) 1 J (b)
10 J
(c) 100 J (d)
1000 J
7. If the
velocity of a body is doubled its kinetic energy
(a) gets
doubled (b)
becomes half
(c) does
not change (d)
becomes 4 times
8. Light year
is a unit of
(a) time (b)
distance
(c)
sunlight intensity (d)
mass
9. In a system
of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is
(a)
(c)
10. The most
accurate reading of the length of a 6.28 cm long fibre is
(a) 6 cm (b)
6.5 cm
(c) 5.99
cm (d)
6.0 cm
11. The number
of significant figures in the measured value 0.0204
is
(a) Five (b)
Three
(c) Four (d)
Two
12. In Circular
motion, the radius vector.
(a) has a
constant magnitude and direction
(b)
changes in magnitude and direction
(c)
changes in magnitude but has a fixed direction
(d)
changes in direction but has a fixed magnitude
13. A tachometer
is a device to measure
(a)
Gravitational pull (b)
Speed of rotation
(c)
Surface tension (d)
Tension in a spring
14. When a car
takes a turn on a horizontal road, the centripetal
force is provided by the
(a) weight
of the car
(b) normal
reaction of the road
(c)
frictional force between the surface of the road and the tyres of the car
(d)
centrifugal force
15. On which of
the following factor does the moment of inertia
of an object not depend upon
(a) Axis
of rotation (b)
Angular velocity
(c)
Distribution of mass (d)
Mass of an object
16. When the
torque acting on the system is zero, which of the following is constant?
(a) Linear
impulse (b)
Linear momentum
(c) Force (d)
Angular momentum
16. A couple
produces,
(a)
pure rotation (b)
pure translation
(c)
rotation and translation (d)
no motion
17. Which of the following remains constant
for a projectile fired from the
Earth?
(a) kinetic energy (b) momentum
(c) horizontal component of velocity
(d) vertical component of velocity
18. What is the minimum number of unequal forces whose resultant will be zero?
(a)
1 (b)
2
(c)
3 (d)
4
19.
The mass of a body is 2 kg. It
weight is
(a) 19.6 N (b) 2 N
(c) 30 N (d) 40 N
20.
The direction of impulse is
a) same as that of the net force
b) opposite to that of the net force
c) same as that of the final
velocity
d) same as that of the initial
velocity
21. Differentiate between speed and velocity
OR
Differentiate between distance and
displacement.
22.
Rest and motion are relative terms
to each other, explain.
23. Derive graphically the following
equations
24.
What is the amount of work done by a
force when a body moves in a
circular path?
OR
In a tug of war one team is slowly
giving way to other. What work is being
done and by whom?
25.
How does the kinetic energy of the
object change if its momentum is doubled.
26.
A physical quantity is given as
27. Give a method to estimate the size of
moon.
OR
How will u find the height of an
accessible object?
28.
Why do we prefer to use a wrench
with a long arm?
OR
Why there are two propellers in a
helicopter?
29.
Derive the relation between torque
and angular momentum.
30. Convert an energy of joule into erg.
OR
The
centripetal force F acting on a particle moving uniformly in a circle may depend upon mass(m) velocity (v) and radius (r) of the circle. Derive
formula for F using method of dimensions.
31.
State triangle law of vectors
addition. Find analytically the magnitude
and direction of resultant vector.
OR
Q What is a projectile? Derive an
expression for its trajectory when
fired at an angle
32. Show that the total mechanical energy of
a body falling under gravity is
conserved.
OR
Q Show that in head on collision between
two balls of equal masses moving
along a straight line, the balls simply exchange
their velocities.
33
Obtain an expression for the
position vector of centre of mass
of a two-particle system.
OR
Q Briefly explain the geometrical meaning
of angular momentum.
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