Q. 21 One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is
A. A rectilinear motion with constant speed
B. A damped oscillatory motion
C. A simple harmonic motion
D.None of the above
C. A simple harmonic motion
Q. 22If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along
A. The same line in opposite sense
B. The perpendicular to both the lines
C. The same line in the same sense
D. None of these
A. The same line in opposite sense
Q. 23 The shape of a suspended cable for a uniformly distributed load over it is
A. Catenary
B. Cubic parabola
C. Circular
D. Parabolic
D. Parabolic
Q. 24 Kinetic friction may be defined as
A. Angle between normal reaction and resultant of normal reaction and limiting friction
B. Ratio of limiting friction and normal reaction
C. Friction force acting when the body is just about to move
D. Friction force acting when the body is in motion
D. Friction force acting when the body is in motion
Q. 25 A funicular polygon cannot be made to pass through
A. Two specified points
B. Three specified points
C. One specified point
D. More than three specified points
D. More than three specified points
Q. 26 From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The C.G. of the remainder is at a height of
A. 5.25 cm
B. 5.5 cm
C. 4.5 cm
D. 5.0 cm
D. 5.0 cm
Q. 27 A cube on a smooth horizontal surface
A.
A. Cannot be in neutral equilibrium
B. Cannot be in unstable equilibrium
C. Cannot be in stable equilibrium
D. Can be in any of these states
D. Can be in any of these states
Q. 28 Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of
A. 10 Newtons
B. 5 Newtons
C. 12 Newtons
D. 8 Newtons
A. 10 Newtons
Q. 29 Rate of change of angular momentum is equal to
A. Linear momentum
B. Impulse
C. Force
D. Torque
D. Torque
Q. 30 A Second’s pendulum gains 2 minutes a day. To make it to keep correct time its length
A. Is not changed but weight of the bob is increased
B. Must be decreased
C. Is not changed but weight of the bob is decreased
D. Must be increased
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