## A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is__________________?

A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is__________________?

A. 60 N
B. 80 N
C. 100 N
D. 120 N

## If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is____________________?

If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is____________________?

A. 30°
B. 45°
C. 60°
D. 120° (Correct)

## The angles between two forces to make their resultant a minimum and a maximum respectively are__________________?

The angles between two forces to make their resultant a minimum and a maximum respectively are__________________?

A. 0° and 90°
B. 180° and 90°
C. 90° and 180°
D. 180° and 0° (Correct)

## The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then_________________?

The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then_________________?

A. P = R
B. Q = R
C. P = Q
D. None of the above is correct

## A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is ___________________?

A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is ___________________?

A. 50 J
B. 150 J
C. 200 J
D. 400 J

## The following is in unstable equilibrium__________________?

The following is in unstable equilibrium__________________?

A. a uniform solid cone resting on a generator on a smooth horizontal plane
B. a uniform solid cone resting on its base on a horizontal plane
C. a solid cube resting on one edge (Correct)
D. a satellite encircling the earth

## A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable ?

A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable ?

A. pyramid (Correct)
B. prism
C. both equally stable
D. none of the above

## A rigid body is in a stable equilibrium if the application of any force__________________?

A rigid body is in a stable equilibrium if the application of any force__________________?

A. can raise the CG of the body but can not lower it (Correct)
B. tends to lower the CG of the body
C. neither raises nor lowers the CG of the body
D. none of above

## Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis ?

Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis ?

A. disc with larger density
B. disc with smaller density
C. both discs will have same rotational inertia
D. none of the above

## A symmetrical body is rotating about its axis of symmetry, its moment of inertia about the axis of rotation being 2 kg -m2 and its rate of rotation 2 revolutions/see. The angular momentum of the body in kg-m2/sec is_____________________?

A symmetrical body is rotating about its axis of symmetry, its moment of inertia about the axis of rotation being 2 kg -m2 and its rate of rotation 2 revolutions/see. The angular momentum of the body in kg-m2/sec is_____________________?

A. 4
B. 6 7i
C. 8TC (Correct)
D. 8