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151.

The section modulus of a rectangular section about an axis through its C.G., is

A.	b / 2	B.	d / 2
C.	bd2 / 2	D.	bd2 / 6

152.

The bending stress in a beam is

directly proportional to

inversely proportional to

153.

The section modulus of a circular section about an axis through its C.G., is

A.	?d2 / 4	B.	?d2 / 16
C.	?d3 / 16	D.	?d3 / 32

154.

If the section modulus of a beam is increased, the bending stress in the beam will

A.	not change	B.	increase
C.	decrease

155.

Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending.

A.	both beams are equally economical	B.	square beam is more economical
C.	circular beam is more economical	D.	none of these

156.

In a beam of uniform strength, the bending stress developed is constant and is equal to the allowable stress at every section of the beam.

True

False

157.

When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at

A.	bottom fibre	B.	top fibre
C.	neutral axis	D.	centre of gravity

158.

A beam of uniform strength may be obtained by

A.	keeping the width uniform and varying the depth	B.	keeping the depth uniform and varying the width
C.	varying the width and depth both	D.	any one of the above

159.

A beam of uniform strength has

A.	same cross-section throughout the beam	B.	same bending stress at every section
C.	same bending moment at every section	D.	same shear stress at every section

160.

The bending stress in a beam is

A.	equal to	B.	less than
C.	more than	D.	directly proportional to