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Quiz 2
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Q.1
Which of the following is a vector quantity
energy
mass
momentum
angle
Q.2
Which of the following is not a vector quantity
weight
velocity
acceleration
force
Q.3
Which of the following is not the unit of energy
kg m
kcal
wattr
watt hours
Q.4
A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to
W
W sin (a + $)
Wtan(a +
Wan(a-
)
Q.5
If a rigid body is in equilibrium under the action of three forces, then
these forces are equal
the lines of action of these forces meet in a point
the lines of action of these forces are parallel
(B) and (C) above
Q.6
If n = number of members andy = number of joints, then for a perfect frame, n =
2j-1
2j-2
2j-3
3j-2
Q.7
Angle of friction is the
Angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction
The ratio of minimum friction force to the friction force acting when the body is just about to move
The ratio of minimum friction force to friction force acting when the body is in motion
Q.8
Which of the following is not the unit of power ?
kW (kilowatt)
hp (horse power)
kg m/sec
kcal/kg sec.
Q.9
If a number of forces act simultaneously on a particle, it is possible
Not a replace them by a single force
To replace them by a single force
To replace them by a single force through C.G.
To replace them by a couple
Q.10
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
38 m
62.5 m
96 m
124 m
Q.11
Effect of a force on a body depends upon
magnitude
direction
position or line of action
all of the above
Q.12
Kinetic friction is the
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move
The friction force acting when the body is in motion
Q.13
The C.G. of a solid hemisphere lies on the central radius 3r
at distance — from the plane base 3r
at distance — from the plane base 3r
at distance — from the plane base 3r
at distance — from the plane base or
Q.14
D Alembert’s principle is used for
reducing the problem of kinetics to equivalent statics problem
determining stresses in the truss
stability of floating bodies
designing safe structures
Q.15
Tangent of angle of friction is equal to
kinetic friction
limiting friction
angle of repose
coefficient of friction
Q.16
Frictional force encountered after commencement of motion is called
post friction
limiting friction
frictional resistance
dynamic friction.
Q.17
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be
20 kg, – ve sense
20 kg, + ve sense
10 kg, + ve sense
10 kg, – ve sense
Q.18
Center of percussion is
the point of C.G.
the point of metacentre
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension
Q.19
The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are
2 and V6
3 and 1 kg
V5 and V5
2 and 5
Q.20
If three forces acting in different planes can be represented by a triangle, these will be in
non-equilibrium
partial equilibrium
full equilibrium
unpredictable
Q.21
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
meet in a point
be all parallel
at least two of them must meet
all the above are correct
Q.22
Limiting force of friction is the
Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move
The friction force acting when the body is in motion
Q.23
The unit of force in S.I. units is
kilogram
newton
watt
dyne
Q.24
The unit of work or energy in S.I. units is
newton
pascal
watt
joule.
Q.25
The unit of power in S.I. units is
newton meter
watt
joule
kilogram meter/sec.
Q.26
The weight of a body is due to
centripetal force of earth
gravitational pull exerted by the earth
force of attraction experienced by par-ticles
gravitational force of attraction towards the centre of the earth.
Q.27
The product of either force of couple with the arm of the couple is called
resultant couple
moment of the forces
resulting couple
moment of the couple
Q.28
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
density of metal can’t be determined
metal is twice as dense as water
metal will float in water
metal is twice as dense as unknown fluid
Q.29
According to principle of transmissibility of forces, the effect of a force upon a body is
Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
The same at every point in its line of action
Minimum when it acts at the C.G. of the body
Q.30
A force is completely defined when we specify
magnitude
direction
point of application
all of the above
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