civil engineering MCQs – Page 52

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
1021. The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is________________?
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A. 4

B. 1

C. 2

D. 3

1022. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?
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A. 20 kg, + ve sense

B. 10 kg, ve sense

C. 10 kg, + ve sense

D. 20 kg, ve sense

E. 45 kg, + ve sense

1023. Coefficient of contraction for an external cylindrical mouthpiece is_________________?
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A. 1.00

B. 0.7H

C. 0.611

D. 0.855

1024. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?
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A. none of the above

B. downwards at its upper end

C. towards the wall at its upper end

D. away from the wall at its upper end

E. upwards at its upper end
1025. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_________________?
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A. 60

B. 45

C. 90

D. 30

E. 0

1026. The ratio of maximum and average shear stresses on a rectangular section, is________________?
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A. 1.5

B. 1

C. 1.25

D. 2.5

1027. For determining the force in the member AB of the truss shown in the given figure by method of sections, the section is made to pass through AB, AD and ED and the moments are taken about___________________?
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A. Joint C

B. Joint B

C. Joint D

D. Joint A

1028. A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 106 kg/cm2, the side of the rod, is_________________?
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A. 1.5 cm

B. 2 cm

C. 2.5 cm

D. 1 cm

1029. The center of gravity of a uniform lamina lies at_______________?
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A. none of the above

B. the mid point of its axis

C. the center of heavy portion

D. the bottom surface

E. all of the above

1030. A shaft subjected to a bending moment M and a torque T, experiences__________________?
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A. Maximum bending stress = 32M d3

B. Maximum shear stress = 16 T d3

C. Both A. and B.

D. Neither A. nor B.

1031. The ratio of the length and depth of a simply supported rectangular beam which experiences maximum bending stress equal to tensile stress, due to same load at its mid span, is_______________?
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A. 3-Jan

B. 2-Jan

C. 2/3

D. 4-Jan

1032. The ratio of the area of cross-section of a circular section to the area of its core, is_______________?
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A. 16

B. 12

C. 4

D. 8

1033. At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by_________________?
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A. Maximum compressive stress at the section

B. Maximum tensile stress at the section

C. Depth of the neutral axis

D. Depth of the section

1034. The S.F. diagram of a loaded beam shown in the given figure is that of________________?
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A. A cantilever with an isolated load at the free end

B. A simply supported beam with uniformly distributed load

C. A simply supported beam with isolated central load

D. A cantilever with a uniformly distributed load
1035. Stress may be defined as_________________?
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A. None of these

B. Force per unit area

C. Force per unit length

D. Force per unit volume

1036. Which of the following statements is correct ?
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A. Lower critical Reynolds number has the value 2000 in pipe flow

B. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow

C. Upper critical Reynolds number is significant in pipe flow problems.

D. Lower critical Reynolds number is of no practical significance in pipe flow problems.
1037. The force in AD of the truss shown in given figure, is________________?
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A. 4.0t compression

B. 3.0t compression

C. 0.5t compression

D. 0.5t tension

1038. Separation of flow occurs when_________________?
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A. the cross-section of a channel is reduced

B. the pressure intensity reaches a minimum

C. all of the above

D. the boundary layer comes to rest
1039. The moment of inertia of a triangular section (height h, base b) about its base, is_______________?
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A. bh3/12

B. bh/12

C. bh/12

D. b3h/12

1040. A steel bar 5 m 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm2 and Poissons ratio is 0.25, the change in the volume of the bar is_________________?
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A. 4.125 cm2

B. 2.125 cm3

C. 3.125 cm3

D. 1.125 cm3