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71.

The moment of inertia of a rectangular section 3cm wide and 4cm deep about X-X axis is

A.	9 cm4	B.	12 cm4
C.	16 cm4	D.	20 cm4

72.

The moment of inertia of a square of side a about its base is a4 / 3

True

False

73.

The moment of inertia of a square of side about its diagonal is

A.	a2 / 8	B.	a3 / 12
C.	a4 / 12	D.	a4 / 16

74.

Moment of inertia of a circular section about its diameter (d) is

A.	?d3 / 16	B.	?d3 / 32
C.	?d4 / 32	D.	?d4 / 64

75.

Moment of inertia of a circular section about an axis perpendicular to the section is

A.	?d3 / 16	B.	?d3 / 32
C.	?d4 / 32	D.	?d4 / 64

76.

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

A.	bh3 / 4	B.	bh3 / 8
C.	bh3 / 12	D.	bh3 / 36

77.

Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

A.	bh3 / 4	B.	bh3 / 8
C.	bh3 / 12	D.	bh3 / 36

78.

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is

A.	nine times	B.	six times
C.	four times	D.	two times

79.

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

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

80.

The moment of inertia of a thin rod of mass m and length l, about an axis through its centre of gravity and perpendicular to its length is

A.	ml2 / 4	B.	ml2 / 6
C.	ml2 / 8	D.	ml2 / 12