1) If two forces acting at a joint are not along the straight line, then for the equilibrium of the joint
A. one of the forces must be zero
B. each force must be zero
C. forces must be equal and of the same sign
D. forces must be equal in magnitude but opposite in sign.
Answer: Option B
2) If the shear force along a section of a beam is zero, the bending moment at the section is
A. zero
B. maximum
C. minimum
D. average of maximum-minimum
Answer: B
3) The shape of the bending moment diagram over the length of a beam, carrying a uniformly distributed load is always
A. linear
B. parabolic
C. cubical
D. circular.
Answer: B
4) The minimum number of rivets for the connection of a gusset plate is
A. 1
B. 2
C. 3
D. 4
Answer: B
5) The maximum twisting moment a shaft can resist is the product of the permissible shear stress and
A. moment of inertia
B. polar moment of inertia
C. polar modulus
D. modulus of rigidly.
Answer: C
6) For a simply supported beam with a central load, the bending moment is
A. least at the centre
B. least at the supports
C. maximum at the supports
D. maximum at the centre.
Answer: D
7) If the width of a simply supported beam carrying an isolated load at its centre is doubled, the deflection of the beam at the centre is changed by
A. 1/2
B. 1/8
C. 2
D. 8
E. 4
Answer: A
8) The deflection of any rectangular beam simply supported, is
A. directly proportional to its weight
B. inversely proportional to its width
C. inversely proportional to the cube of its depth
D. directly proportional to the cube of its length
E. none of these.
Answer: C
9) Influence lines are drawn for structures
A. of any type
B. statically determinate
C. pin-jointed truss
D. none of these.
Answer: A
10) A simply supported beam carrying a uniformly distributed load over its whole span is propped at the centre of the span so that the beam is held to the level of the end supports. The reaction of the prop will be
A. half the distributed load
B. 3/8th the distributed load
C. 5/8th the distributed load
D. distributed load.
E. none of these.
Answer: C
11) The range within which a load can be applied on a rectangular column, to avoid any tensile stress, is
A. one-half of the base
B. one-third of the base
C. one-fourth of the base
D. one-fifth of the base
E. one-sixth of the base on either side of the centroid.
Answer: B
12) In a beam, the neutral plane
A. maybe it's centre
B. passes through the C.G. of the area of cross-section
C. does not change during deformation
D. none of these.
Answer: C
13) When loads are applied proportionately to a frame structure containing its members in one plane, the structure is called
A. grid frame
B. plane frame
C. space frame
D. truss frame.
Answer: B
14) The shear stress at any section of a shaft is maximum
A. at the centre of the section
B. at a distance r/2 from the centre
C. at the top of the surface
D. at a distance 3/4 r from the centre
E. none of these.
Answer: C
15) The region of the cross-section of a column in which compressive load may be applied without producing any tensile stress is known as the core of the cross-section. In circular columns the radius of the core is
A. one-half of the radius
B. one-third of the radius
C. one-quarter of the radius
D. one-fifth of the radius
E. one-sixth of the radius.
Answer: C
16) A beam is said to be of uniform strength, if
A. B.M. is same throughout the beam
B. deflection is the same throughout the beam
C. bending stress is the same throughout the beam
D. shear stress is the same throughout the beam
E. none of these.
Answer: C
17) The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is
A. 1/4
B. 1/2
C. 1/16
D. 15/16
E. 3/8
Answer: D
18) The weakest section of a diamond riveting is the section which passes through
A. first row
B. second row
C. central raw
D. one rivet hole of end row.
Answer: A
19) In a loaded beam, the point of con-traflexture occurs at a section where
A. bending moment is minimum
B. bending moment is zero or changes sign
C. bending moment is maximum
D. shearing force is maximum
E. shearing force is minimum.
Answer: B
20) The shape of the bending moment diagram over the length of a beam, having no external load, is always
A. linear
B. parabolic
C. cubical
D. circular.
Answer: A
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