Related Questions
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4
A machine having an efficiency greater than 50%, is known as
B. Non-reversible machine
C. Neither reversible nor non-reversible machine
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4
Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.
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The resultant of two forces P and Q acting at an angle θ is
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A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.
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4
The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is
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4
In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
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4
The maximum velocity of a particle moving with simple harmonic motion is
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Coefficient of friction is the
A. Angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion
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4
Non-coplanar non-concurrent forces are those forces which
A. Meet at one point, but their lines of action do not lie on the same plane
B. Do not meet at one point and their lines of action do not lie on the same plane
C. Do not meet at one point but their lines of action lie on the same plane
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4
A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
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4
If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella
A. More inclined when moving
B. Less inclined when moving
C. More inclined when standing
D. Less inclined when standing
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4
When the spring of a watch is wound, it will possess
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The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
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Tangent of angle of friction is equal to
D. Coefficient of friction
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Which of the following do not have identical dimensions?
D. Moment of a force and angular momentum.
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The matter contained in a body, is called
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4
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)
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The unit of energy in S.I. units is
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The unit of angular velocity is
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If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be
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4
The velocity ratio of a differential wheel and axle with D as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is
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When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
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A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is μ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
B. Slant up towards direction of pull
C. Slant down towards direction of pull
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The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.
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4
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
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4
When a body of mass moment of inertia I (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is
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4
In order to determine the effects of a force, acting on a body, we must know
A. Magnitude of the force
B. Line of action of the force
C. Nature of the force i.e. whether the force is push or pull
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The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is
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The unit of moment of inertia of an area is
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During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.