1.Torque is the _______ effect produced by
a force acting on a body:
a) Accelerating
b) Stopping
c)
Lifting
d) Turning
|
A
|
2.Torque is a vector quantity that produces
_______ in a body:
a) Momentum
b) Angular
acceleration
c) Angular
momentum
d) Linear acceleration
|
B
|
3.Units of torque in the SI system are:
a) mS-1
b) mS
c) NS
d) Nm
|
D
|
4.Torque is also called:
a)
Moment of force
b)
Moment of the inertia
c)
Centrifugal force
d)
Centripetal force
|
A
|
5.The shortest distance between the line of
action of the force and the origin (fixed point) is called:
a)
Moment
b)
Moment arm
c)
Position vector
d)
Radius vector
|
B
|
6.For given values of F and r, the magnitude of
the torque will be maximum when the angle between them is:
a)
30o
b)
45o
c)
60o
d)
90o
|
D
|
7.By convention, torques producing
anti-clockwise rotation are taken as:
a)
Positive
b)
Negative
c)
Zero
d)
None of the above
|
A
|
8.Two equal and anti-parallel forces acting
on a body form a _______.
a)
Pair
b)
Couple
c)
Torque
d)
Moment
|
B
|
9.If the distance between the lines of
action of two forces forming a couple and having a magnitude F is L, then the
magnitude of the couple is:
a)
1/2FxL
b)
L 2FxL
c)
FxL
d)
FxL2
|
C
|
10.The point in a body at which an applied
force produces linear acceleration but no rotation is called its:
a)
Geometric centre
b)
Centre of gravity
c)
Centre of mass
d)
Core
|
C
|
11.During the motion of a rigid body, its
centre of mass describes only:
a)
Translational motion
b)
Rotational motion
c)
Vibrational motion
d)
Rotational and translational motion
|
A
|
12.The point on which the weight of a body
acts is called its:
a)
Centre of gravity
b)
Centre of mass
c)
Geometric centre
d)
Core
|
A
|
13.If the gravitational field is uniform
the centre of mass and centre of gravity of a body:
a)
Are opposite to each other
b)
Lie in the same line
c)
Coincide with each other
d)
Have no relation with each other
|
C
|
14.Angular momentum and moment of inertia
are related to each other by the relation:
a)
I=LxwI
b)
I=Lw2
c)
L=Ixw
d) I=L2w
|
C
|
15.The magnitude of angular momentum can be
found by the expression:
a)
mrw
b)
mrw2
c)
m2rw
d)
mr2w
|
D
|
16.If a particle moves in a circular orbit
with constant speed, its angular momentum about the centre of the circle:
a)
Change with time
b)
Depends on its angular displacement
c)
Remains constant
d)
Depends on its angular velocity
|
C
|
17.The angular momentum of a particle
having uniform velocity about a fixed origin:
a)
Varies with its position w.r.t. the origin
b)
Varies with time
c)
Remains constant
d)
Is zero
|
C
|
18.According to the law of conservation of
angular momentum, the angular momentum of a rotating body or system of bodies
is constant if no external _______ acts on the body about that axis:
a)
Torque
b)
Force
c)
Couple
d)
Moment of inertia
|
A
|
19.Torque is also called as:
a)
Moment of inertia
b)
Moment of momentum
c)
Moment of force
d)
Quantity of motion
|
B
|
20.A diver uses the law of conservation of
momentum when he curls his body while diving so as to:
a)
Make his jumping time shorter
b)
Plunge into water at a farther point
c)
Make one or two extra somersaults
d)
Jump into the water more safely
|
C
|