PHYSICS
TORQUE & EQUILIBRIUM
TEST-1
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
|
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