MCQ
1661.
Coefficient of friction is the-
angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reacion
the friction force acting when the body is just about to move
the friction force acting when the body is in motion
1662.
In order to determine the effects of a fore, acting on a body we must know-
magnitude of the force
line of action of the force
nature of the force i, e whether the force is push or pull
all of these
1663.
Pick up wrong statement about friction force for dry surfaces. Friction force is-
proportional to normal load between the surfaces
dependent on the materials of contact surface
proportional to velocity of sliding
independent of the area of contact surfaces
1664.
force while acting on a body may-
change its motion
balance the forces already acting on it
give rise to the internal stresses in it
all of those
1665.
Frictional force encountered after commencement of motion is called-
post friction
limiting friction
kinematic friction
dynamic friction
1666.
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be-
towards the wall at its upper end
away from the wall at its upper end
upwards at its upper end
downwards at its upper end
1667.
The ratio of limiting friction and normal reaction is known as-
coefficient of friction
angle of friction
angle of repose
sliding friction
1668.
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be-
downwards at its upper end
upwards at its upper end
perpendicular to the wall at its upper end
zero at its upper end
1669.
The angle between two forces when the resultant is maximum and minimum respectively are-
0° and 180°
180° and 0°
90°
90° and 0°
1670.
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
1671.
The maximum frictional force which comes into play when a body just begins to slide over another surface is called-
limiting friction
sliding friction
rolling friction
kinematic friction
1672.
Which one of the following statements is not correct-
the tangent of the angle of friction is equal to coefficient of friction
the angle of repose is equal to angle of friction
the tangent of the angle of repose is equal to coefficient of friction
the sine of the angle of repose is equal to coefficient to friction
1673.
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
1674.
Coulomb friction is the friction between-
bodies having relative motion
two dry surfaces
two lubricated surfaces
solids and liquids
1675.
Dynamic friction as compared to static friction is-
same
more
less
maybe less of more depending on nature of surfaces and velocity
1676.
The algebraic sum of moments of the forces. forming couple about any point in their plane is-
equal to the moment of the couple
constant
both of above are correct
both of above are wrong
1677.
The total motion possessed by a body is called-
impulsive force
mass
wight
momentum
1678.
The co-efficient of friction depends upon-
nature of surfaces
area of contact
shape of the surfaces
all of the above
1679.
Concurrent forces are those forces whose lines of action-
lie on theme line
meet at one point
meet on the same plane
none of these
1680.
Tangent of angle of friction is equal to-
kinetic friction
limiting friction
angle of repose
coefficient of friction