.
 PHYSICS
  *CHAPTER#3* 
 *1) CHAPTER NAME*
 *Rotational and Circular Motion* 
 *2) TOPICS* 

*LMS TEST SERIES*

TEST NO# 13

 *SUBJECT PHYSICS*
 Total MCQs #30
Rotational and circular motion
1))). The ratio of angular speeds of minute hand and hour hand of a watch is:
A. 6:1
B. 1:12
C. 12:1
D. 1:6
2))). The angular velocity of a particle rotating in a circular orbit 100 times per
minute is:
A. 1.66 rad/sec
B. 10.47 Deg/sec
C. 10.47 rad/sec
D. 60 Deg/sec
3))). If a rotating body is moving counter clockwise, direction of angular
velocity will be:
A. Along linear velocity
B. Along the axis of rotation
C. Towards centre
D. Away from centre
4))). The angular speed of a fly wheel making 120 rev/min is:
A. 2π rad/sec
B. 4π rad/sec
C. 6π rad/sec
D. π rad/sec
5.))) The shaft of a motor rotates at a constant angular speed of 360 rev/min.
Angle turned through in 1sec in radian is:
A. Π
B. 3π
C. 6π
D. 12π
6))). When a body moves in a circle, the angle between its velocity v and
angular velocity w is always
A. 0°
B. 360°
C. 180°
D. 90°
7))). A wheel of radius 1m covers an angular displacement of 180. It’s linear
Displacement is:
A. 3.14m
B. π rad
C. 6.28m
D. 0.517m
8))). Linear velocity and tangential velocity of any particle moving in a circular
path of radius 2 m with angular velocity 8 rad/sec will be:
A. 16m/s
B. 4m/s
C. 10m/s
D. 6m/s
9))). If a car moves with a uniform speed of 2m/s in a circle of radius 0.4m.
it’s angular speed is:
A. 4 rad/sec
B. 5rad/sec
C. 1.6rad /sec
D. 2.8m/s
10))).For a particle in a uniform circular motion the relation a= r(alpha) of
accelerations hold . The acceleration ‘a’ :
A. Is centripetal acceleration
B. Is radial acceleration
C. Is tangential acceleration
D. Both A and B
11))).The acceleration of a motor car is 8m/sec^2 . If the diameter of its wheel
be 2m. It’s angular acceleration will be :
A. 8 rad/sec^2
B. 16 rad/sec^2
C. 10 m/sec^2
D. 10 rad/sec^2
12.))Work done due to centripetal force for circular motion will be:
A. Reduced
B. Maximum
C. Half
D. Zero
13))).The mud flies off the tyre of a fast moving car in the direction :
A. Parallel to the moving tyre
B. Tangent to the moving tyre
C. Anti parallel to the moving tyre
D. None of these
14))).When a wheel 1m in diameter makes 30rev/min , the linear speed of
point on its rim in m/s is:
A. 2π
B. 3π
C. π/2
D. 4π
15))).A particle revolves around a circular path wit+ a constant speed . The
acceleration of the particle is:
A. Along the circumference of the circle
B. Along the tangent
C. Along the radius
D. Zero
16))).The force which can do no work on the body on which it acts:
A. Frictional force
B. Gravitational force
C. Elastic force
D. Centripetal force
17))).A car moving with high velocity when it has a turn. A force acts around
on it outwardly because of:
A. Centripetal force
B. Centrifugal force
C. Gravitational force
D. All of the above
18))).A cyclist turns around a curve at 15 miles/hour . If he turns at double the
speed , the tendency to overturn is:
A. Quadrupled
B. Unchanged
C. Halved
D. Double
19))).A body of mass 5 kg is moving in a circle of radius 1m with an angular
velocity of 2 radia
B. 30N
C. 20N
D. 40N
20))).The direction of centripetal force is:
A. Towards the centre
B. Away from the centre
C. Along the tangential velocity
D. Along the axis of rotation
21))).A car of mass 1000kg travelling at 40m/s round a curve of radius 100m.
What is the Fc :
A. 100N
B. 1.6×10^4N
C. 8N
D. 1.5×10^6N
22))).The curved flight of fighter planes at high speed requires a large:
A. Gravitational force
B. Centripetal force
C. Frictional force
D. Centrifugal force
23))).The centripetal force has the same dimension as the:
A. Angular acceleration
B. Centrifugal force
C. Centripetal acceleration
D. Centrifugal acceleration
24))).A 500kg crane takes a turn of radius 50m with velocity of 36 km/hr. The
centripetal force is:
A. 1200N
B. 1000N
C. 750N
D. 250N
25))).The force required to bend the normally straight path of a particle into a
circular path is called _ force.
A. Travelling
B. Bending
C. Centrifugal
D. Centripetal
26))).A point on the rim of a wheel 4m in diameter has a velocity of 1600
cm/s. The angular velocity of wheel is:
A. 2 rad/sec
B. 6 rad/sec
C. 4 rad/sec
D. 8 rad/sec
27))).An object is moving along a circular path of radius 4m . What will be it’s
angular displacement if it moves 14m on this circular path?
A. 5.5 rad
B. 3.5 rad
C. 5.0 rad
D. 4.5 rad
28))).Which of the following gives the relationship between linear velocity and
and angular velocity ?
A. v= rw
B. v=rS
C. v=ar
D. v=r(alpha)
29))).A body moves in a circle with increasing angular velocity . At time t= 6sec
, the angular velocity is 27 rad/sec . What is the radius of circle made by
the body where linear velocity is 81cm/s?
A. 6cm
B. 3cm
C. 9cm
D. 7cm
30))).For positive angular displacement the rotation would be:
A. Clockwise
B. Parallel
C. Anti clockwise
D. Perpendicular

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Key 
*KEYS PHYSICS CHAPTER# 3*
1). (C)
2). (C)
3). (B)
4). (B)
5). (D)
6). (D)
7). (A)
8). (A)
9). (B)
10).(C)
11).(A)
12).(D)
13).(B)
14).(C)
15).(C)
16).(D)
17).(B)
18).(A)
19).(C)
20).(A)
21).(B)
22).(B)
23).(B)
24).(B)
25).(D)
26).(D)
27).(B)
28).(A)
29).(B)
30).(C)


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