civil engineering MCQs – Page 283

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 Review each marked answer and report any item that may be outdated or unclear.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
5641. The maximum B.M. due to an isolated load in a three hinged parabolic arch, (span l and rise h) having one of its hinges at the crown, occurs on either side of the crown at a distance_______________?
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A. h/4

B. l/4

C. l

D. l

5642. Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to___________________?
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A. Reciprocal of the length of the shaft

B. Modulus of rigidity

C. Moment of inertia of the shaft section

D. Angle of twist

5643. The point of contraflexure is the point where_______________?
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A. B.M. is maximum

B. B.M. changes sign

C. S.F. is zero

D. B.M. is minimum

5644. The strain energy due to volumetric strain________________?
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A. Is directly proportional to the square of exerted pressure

B. All the above

C. Is inversely proportional to Bulk modulus

D. Is directly proportional to the volume

5645. 0. At its elastic limit, the following statement is true, 0/E__________________?
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A. /2E volume

B. Strain energy = 0

C. All the above

D. Maximum shear stress = /2

E. Strain is equal to

5646. length of a column of length L, having one end fixed and other end hinged, is The equivalent_____________?
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A. L

B. L/2

C. L

D. 2 L

5647. The ratio of moments of inertia of a triangular section about its base and about a centroidal axis parallel to its base, is_________________?
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A. 3.0

B. 1

C. 1.5

D. 2

5648. In case of principal axes of a section________________?
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A. Sum of moment of inertia is zero

B. Product of moment of inertia is zero

C. None of these

D. Difference of moment inertia is zero

5649. The moment of inertia of a triangular section (height h, base b) about its base, is_______________?
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A. b3h/12

B. bh3/12

C. bh/12

D. bh/12

5650. For calculating the allowable stress of long columns known as_________________?
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A. Straight line formula

B. Rankines formula

C. Parabolic formula

D. Perrys formula

5651. A spring of mean radius 40 mm contains 8 action coils of steel (N = 80000 N/mm2), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is_____________?
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A. 30 N

B. 25 N

C. 35 N

D. 40 N

5652. A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is________________?
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A. L/d

B. (L/2d)

C. L/2d

D. (L/3d)

5653. The force in AD of the truss shown in given figure, is________________?
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A. 3.0t compression

B. 4.0t compression

C. 0.5t tension

D. 0.5t compression
5654. In the truss shown in given figure the force in member DC is________________?
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A. 100 t tensile

B. Zero

C. Indeterminate

D. 100 t compressive

5655. A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm2 is________________?
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A. 4.5 mm

B. 5.5 mm

C. 5.0 mm

D. 4.0 mm

5656. A rectangular column shown in the given figure carries a load P having eccentricities ex and ey along X and Y axes. The stress at any point (x, y) is_______________?
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A. (p/bd) [1 + (ey. y/d) + ( ex. x/d)]

B. p [1 + (6ey. y/b) + (6ex. x/ b)]

C. (p/bd) [1 + (6ey. y/d) + (6ex. x/b)]

D. (p/bd) [1 + (12ey. y/d) + (12ex. x/d)]
5657. A simply supported beam carries a varying load from zero at one end and w at the other end. If the length of the beam is a, the shear force will be zero at a distance x from least loaded point where x is_________________?
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A. a/2

B. a

C. a

D. a/3

5658. A compound truss may be formed by connecting two simple rigid frames, by_________________?
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A. Three bars intersecting at a point

B. Three bars

C. Three parallel bars

D. Two bars

5659. 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. 2 cm

B. 1 cm

C. 1.5 cm

D. 2.5 cm

5660. The ratio of the deflections of the free end of a cantilever due to an isolated load at 1/3rd and 2/3rd of the span, is________________?
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A. 2/7

B. 7-Jan

C. 7-Mar

D. 5-Feb