civil engineering MCQs – Page 285

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 Review each marked answer and report any item that may be outdated or unclear.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

5681. For permissible shear stress fs, the torque transmitted by a thin tube of mean diameter D and wall thickness t, is________________?
0

A. ( /2) t fs

B. ( /2) t fs

C. ( /4) fs

D. D2t fs

5682. The degree of indeterminacy of the frame in the given figure, is______________?
0

A. 1

B. Zero

C. 3

D. 2

5683. The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is________________?
0

A. 1

B. 4

C. 2

D. 3

5684. If the strain energy stored per unit volume in a hollow shaft subjected to a pure torque when t attains maximum shear stress fs the ratio of inner diameter to outer diameter, is 17/64 (f /N)s__________________?
0

A. 2-Jan

B. 5-Jan

C. 1/4

D. 3-Jan

5685. 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_________________?
0

A. 1.125 cm3

B. 2.125 cm3

C. 4.125 cm2

D. 3.125 cm3

5686. For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D. Distances AD, DD and AD when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is___________________?
0

A. 60

B. 30

C. 45

D. 90

5687. Flat spiral springs_______________?
0

A. Are supported at outer end

B. Are wound by applying a torque

C. All the above

D. Consist of uniform thin strips

5688. For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is________________?
0

A. 0.404

B. 0.707

C. 0.505

D. 0.303

5689. At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by_________________?
0

A. Maximum tensile stress at the section

B. Maximum compressive stress at the section

C. Depth of the section

D. Depth of the neutral axis

5690. Maximum principal stress theory for the failure of a material at elastic point, is known________________?
0

A. St. Venants theory

B. Rankines theory

C. Von Mises theory

D. Guests or Trecas theory

5691. The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is__________________?
0

A. F/A

B. F/2A

C. 3F/2A

D. 2F/3A

5692. The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is________________?
0

A. 10-Jan

B. 12-Jan

C. 1/16

D. 8-Jan

5693. Slenderness ratio of a long column, is_________________?
0

A. Radius of gyration divided by area of cross-section

B. Area of cross-section divided by radius of gyration

C. Area of cross-section divided by least radius of gyration

D. Length of column divided by least radius of gyration

5694. Gradually applied static loads do not change with time their_______________?
0

A. Magnitude

B. Point of application

C. All the above

D. Direction

5695. Pick up the correct statement from the following?
0

A. The bending stress in a section is zero at its neutral axis and maximum at the outer fibres

B. All the above

C. The shear stress is zero at the outer fibres and maximum at the neutral axis

D. The bending stress at the outer fibres, is known as principal stress

5696. The force in AC of the truss shown in the given figure, is_________________?
0

A. 4t compression

B. 5t compression

C. 4t tension

D. 5t tension

5697. The yield moment of a cross section is defined as the moment that will just produce the yield stress in_________________?
0

A. The inner most fibre of the section

B. The neutral fibre of the section

C. The outer most fibre of the section

D. The fibre everywhere

5698. At yield point of a test piece, the material__________________?
0

A. Obeys Hookes law

B. Behaves in an elastic manner

C. Regains its original shape on removal of the load

D. Undergoes plastic deformation

5699. A masonry dam (density = 20,000 N/m3) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be_______________________?
0

A. 75 N/m2

B. 75000 N/m2

C. 750 N/m 2

D. 7500 N/m 2

5700. The degree of indeterminacy of the frame in the given figure, is__________________?
0

A. Zero

B. 1

C. 3

D. 2

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