120. In a beam, the neutral plane

A. may be its centre

B. passes through the C.G. of the area of cross-section

C. does not change during deformation

D. none of these.

121. A beam is said to be of uniform strength, if

A. B.M. is same throughout the beam

B. deflection is same throughout the beam

C. bending stress is same throughout the beam

D. shear stress is same throughout the beam

122. The point of contraflexture occurs in

A. cantilever beams only

B. continuous beams only

C. over hanging beams only

D. all types of beams

123. A simply supported beam (1 + 2a) with equal overhangs (a) carries a uniformly distributed load over the whole length, the B.M. changes sign if

A. 1 > 2a

B.1 < 2a

C. 1 = 2a

D. 1 = 4a

124. In a simply supported beam (1 + 2a) with equal overhangs (a) and carrying a uniformly distributed load over its entire length, B.M. at the middle point of the beam will be zero if

A. / = 2a

B. 1 = 4a

C. < 2a

D.1>a

125. A beam of length L supported on two intermediate rollers carries a uniformly distributed load on its entire length. If sagging B.M. and hogging B.M. of the beam are equal, the length of each overhang, is

A. 0.107 L

B. 0.207 L

C. 0.307 L

D. 0.407 L

126. Pick up the correct statement from the following :

A. The rate of change of bending moment is equal to rate of shear force

B. The rate of change of shear force is equal to rate of loading

C. neither (a) nor (b)

D. both (a) and (b).

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