41. A simply supported beam of length 1 carries a load varying uniformly from zero at left end to maximum at right end. The maximum bending moment occurs at a distance of
a) 1/V3 from left end
b) 1/3 from left end
c) 1/V3 from right end
d) 1/3 from right end
Ans: a
42. A portion of a beam between two sections is said to be in pure bending when there is
a) constant bending moment and zero shear force
b) constant shear force and zero bending moment
c) constant bending moment and constant shear force
d) none of the above
Ans: a
43. The ratio of width to depth of a strongest beam that can be cut out of a cylindrical log of wood is
a) 1/2
b) 1/V2
c) 1/3
d) 2/3
Ans: b
44. Of the several prismatic beams of equal lengths, the strongest in flexure is the one having maximum
a) moment of inertia
b) section modulus
c) tensile strength
d) area of cross-section
Ans: b
45. Of the two prismatic beams of same material, length and flexural strength, one is circular and other is square in cross-section. The ratio of weights of circular and square beams is
a) 1.118
b) 1.342
c) 1.000
d) 0.793
Ans: a
46. A flitched beam consists of a wooden joist 150 mm wide and 300 mm deep strengthened by steel plates 10 mm thick
and 300 mm deep one on either side of the joist. If modulus of elasticity of steel is 20 times that of wood, then the width of equivalent wooden section will be
a) 150 mm
b) 350 mm
c) 500 mm
d) 550 mm
Ans: d
47. A beam of rectangular cross-section is 100 mm wide and 200 mm deep. If the section is subjected to a shear force of 20 kN, then the maximum shear stress in the section is
a) 1 N/mm2
b) 1.125 N/mm2
c) 1.33 N/mm2
d) 1.5 N/mm2
Ans: d
48. A beam of square cross-section with side 100 mm is placed with one diagonal vertical. If the shear force acting on the section is 10 kN, the maximum shear stress is
a) 1 N/mm2
b) 1.125 N/mm2
c) 2 N/mm2
d) 2.25 N/mm2
Ans: b
49. A prismatic bar when subjected to pure bending assumes the shape of
a) catenary
b) cubic parabola
c) quadratic parabola
d) arc of a circle
Ans: d
50. A beam of triangular cross section is placed with its base horizontal. The maximum shear stress intensity in the
section will be
a) at the neutral axis
b) at the base
c) above the neutral axis
d) below the neutral axis
Ans: c
a) 1/V3 from left end
b) 1/3 from left end
c) 1/V3 from right end
d) 1/3 from right end
Ans: a
42. A portion of a beam between two sections is said to be in pure bending when there is
a) constant bending moment and zero shear force
b) constant shear force and zero bending moment
c) constant bending moment and constant shear force
d) none of the above
Ans: a
43. The ratio of width to depth of a strongest beam that can be cut out of a cylindrical log of wood is
a) 1/2
b) 1/V2
c) 1/3
d) 2/3
Ans: b
44. Of the several prismatic beams of equal lengths, the strongest in flexure is the one having maximum
a) moment of inertia
b) section modulus
c) tensile strength
d) area of cross-section
Ans: b
45. Of the two prismatic beams of same material, length and flexural strength, one is circular and other is square in cross-section. The ratio of weights of circular and square beams is
a) 1.118
b) 1.342
c) 1.000
d) 0.793
Ans: a
46. A flitched beam consists of a wooden joist 150 mm wide and 300 mm deep strengthened by steel plates 10 mm thick
and 300 mm deep one on either side of the joist. If modulus of elasticity of steel is 20 times that of wood, then the width of equivalent wooden section will be
a) 150 mm
b) 350 mm
c) 500 mm
d) 550 mm
Ans: d
47. A beam of rectangular cross-section is 100 mm wide and 200 mm deep. If the section is subjected to a shear force of 20 kN, then the maximum shear stress in the section is
a) 1 N/mm2
b) 1.125 N/mm2
c) 1.33 N/mm2
d) 1.5 N/mm2
Ans: d
48. A beam of square cross-section with side 100 mm is placed with one diagonal vertical. If the shear force acting on the section is 10 kN, the maximum shear stress is
a) 1 N/mm2
b) 1.125 N/mm2
c) 2 N/mm2
d) 2.25 N/mm2
Ans: b
49. A prismatic bar when subjected to pure bending assumes the shape of
a) catenary
b) cubic parabola
c) quadratic parabola
d) arc of a circle
Ans: d
50. A beam of triangular cross section is placed with its base horizontal. The maximum shear stress intensity in the
section will be
a) at the neutral axis
b) at the base
c) above the neutral axis
d) below the neutral axis
Ans: c
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