Paper for Entry Test Preparation
Physics 1st year Chapter No. 5
Total marks:- 160 Time
allowed 30 minutes
Note:- Fill
the appropriate answer of the following questions in the answer sheet. Double
filling and erasing is not allowed. Each question carries equal marks and for
each wrong answer minus one is awarded.
1) Angular displacement is a vector quantity for:
a)
Very small value of DӨ b)
very large value of DӨ
c) All value of DӨ d) Non of these
2) Conventionally the angular velocity is directed
at an angle of:
a)
90o to the axis of rotation b) 30o to the axis of
rotation
c)
0o to the axis of rotation d)
None of the above
3) Centripetal acceleration is also called ___
acceleration:
a)
Tangential b)
Radial c) Angular d) Non of these
4) When a body moves along a circular path with
constant speed, it has an acceleration, which is always directed:
a)
Along the tangent b)
Towards the centre c) Away
from the centre d) None of these
5) Centripetal force performs:
a)
Maximum work b) Negative
work c) Positive work d) None of all
6) The time period is related with angular velocity
as:
a)
T = p/2w b)
T = w/2p c)
T = 2p/w d)
T = 2w/p
7) p
radians is equal to:
a)
360o b)
180o c)
90o d)
45o
8) A rotating body tends to be slower, when its
angular acceleration is:
a)
Positive b)
Negative c)
Zero d)
Infinity
9) Radian is defined as the angle subtended at the
centre of a circle by an arc of:
a)
Length equal to its diameter b)
Length equal to its radius
c)
Any length d)
None of these
10) The whole circumference subtends at the centre
of the circle an angle of:
a)
2p radian b) p radian c)
p/6
radian d) None
of all
11) Circular motion is an example of motion in:
a)
One dimensional b) Two
dimensional c) Three
dimensional d) All of above
12) When an object moves with a uniform angular
velocity, then its instantaneous angular velocity is equal to:
a)
Zero b)
Its average velocity c) Its
angular displacement d) None of these
13) Which of the following equation is not related
with angular motion:
a)
Ө = wt b) v = rw c)
s = vt d)
Both (b) and (c)
14) Angular velocity is a:
a)
Scalar quantity b)
Vector quantity c)
Complex quantity d) None of
these
15) When a body moves with a constant speed in a
circle:
a)
No work is done on it b)
No acceleration is produced in the body
c)
Velocity remains constant d)
None of all
16) The instantaneous acceleration of a body moving
with constant speed in a circle:
a)
Remains constant b) Rotational
acceleration d) Tangential
acceleration d) Centripetal
acceleration
17) A body can have constant velocity when it
follows:
a)
A circular path b) A
rectilinear path c) Parabolic path d) Non of all
18) The direction of linear velocity of a body
moving in circle is along the:
a)
Axis of rotation b)
Tangent c)
Radius d)
Sphere
19) Magnitude of centripetal force is directly
proportional to:
a)
Square of angular velocity of the revolving body b) Mass of the revolving body
c)
Both (a) and (b) d)
None of all
20) ___ plays the same role during angular motion as
played by the mass in linear motion:
a)
Torque b)
Angular momentum c) Moment of a
force d) Moment of inertia
21) Moment of inertia depends upon:
a)
Mass b)
Axis of rotation c) Both
(a) and (b) d) Non of
all
22) The relation b/w t, I and α is as follows:
a)
t = I2
α b)
α = t I c) I = α t d)
t = I α
23) Tick the pair that has the same formula for
calculating the moment of inertia:
a)
Disc, sphere b)
Sphere, hoop c) Thin
rod, hoop d) Hoop, disc
24) Moment of linear momentum is called:
a)
Moment arm b)
Moment of inertia c) Inertia d) Angular
momentum
25) Direction of angular momentum is determined by:
a)
Right hand rule b) Head
to tail rule c) Left
hand rule d) All of
above
26) The total angular momentum of a system of particles:
a)
Changes when a net external torque acts upon it b)
Changes when a net external force acts upon it
c)
Remains constant weather net torque applies or not d) Non of all
27) Law of conservation of angular momentum is not
important in:
a)
Diving b)
Gymnastics c)
Ice-skating d)
All of above
28) If plane of rotation id YZ plane, then axis of
rotation will be along:
A)
X-axis b)
Y-axis c)
Z-axis d)
XY-plane
29) For the angular momentum of a system to remains
constant, the external torque should be:
a)
Small b)
Large c)
Zero d)
None of these
30) Magnitude of angular momentum is measured by:
a)
r p sin Ө b)
r p cos Ө c) m
v r cos Ө d) All
of above
31) Which one is not related to angular motion:
a)
Moment of a force b) Moment
of inertia c) Moment of
momentum d) All of above
32) An electron rotating about its own axis also
possess the property of:
a)
Orbital angular momentum b) Spin angular
momentum d) Any of these d) All of these
33) In an accelerated frame of reference, the weight
of the body depends upon:
a)
Acceleration of frame of reference b)
Velocity of a body
c)
Velocity of frame of reference d)
Non of these
34) A man in an elevator descending with
acceleration (less than g) will conclude that his weight:
a)
Has increased b) Has
decreases c) Remains
constant d) Non of all
35) The weight of a man in a elevator moving up with
an acceleration equal to 3 g will become:
a)
Double b)
Three times c)
Zero d)
Four times
36) Satellites are held in orbits around the earth
by its:
a)
Gravitational field b)
Magnetic field c) Own
orbital motion d) Own spin
motion
37) Your apparent weight in a elevator differs from
your true weight when its velocity:
a)
Increases b)
Decreases c)
Either (a) or (b) d)
Remains constant
38) ‘Close orbiting satellites’ obit around the
earth at a height of about:
a)
4 km b)
40 km c)
400 km d)
4000 km
39) Einstein’s theory about gravity is better than
Newton’s because it gave explanation of:
a)
Inverse square law b) Bending
of light c) Both (a) and
(b) d) Non of all
40) The force and torque are analogous to:
a)
Velocity b)
Each other c)
Mass and weight d) Non of all
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