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81.

The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudenal axis or polar axis is

A.	mr2 / 2	B.	mr2 / 4
C.	mr2 / 6	D.	mr2 / 8

82.

The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

A.	mr2 / 3	B.	2mr2 / 3
C.	2mr2 / 5	D.	3mr2 / 5

83.

The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is

A.	2mr2 / 3	B.	2mr2 / 5
C.	7mr2 / 3	D.	7mr2 / 5

84.

The moment of inertia of a solid sphere of mass m and radius r is

A.	2mr2 / 3	B.	2mr2 / 5
C.	mr2	D.	mr2 / 2

85.

The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is

A.	3mr2 / 5	B.	3mr2 / 10
C.	2mr2 / 5	D.	4mr2 / 5

86.

A force acting in the opposite direction to the motion of the body is called force of friction.

Agree

Disagree

87.

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A.	static friction	B.	dynamic friction
C.	limiting friction	D.	coefficient of friction

88.

The friction experienced by a body, when at rest, is known as

A.	static friction	B.	dynamic friction
C.	limiting friction	D.	coefficient of friction

89.

The ratio of static friction to dynamic friction is always

A.	equal to one	B.	less than one
C.	greater than one	D.	none of these

90.

The friction experienced by a body, when in motion, is known as

A.	rolling friction	B.	dynamic friction
C.	limiting friction	D.	static friction