civil engineering MCQs – Page 91

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 Review each marked answer and report any item that may be outdated or unclear.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
4501. The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of___________________?
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A. 10 mm

B. 15 mm

C. 20 mm

D. 25 mm
4502. Lapped splices in tensile reinforcement are generally not used for bars of size larger than______________?
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A. 18 mm diameter

B. 24 mm diameter

C. 36 mm diameter

D. 30 mm diameter

4503. mutually perpendicular principal stresses acting on a soil mass, the normal stress If p1 and p2 are________________?
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A. 2

B. [(p p p p cos 2

C. [(p p p p cos 2

D. [(p p p p /2] sin 2

E. [(p p p p to the principal plane carrying the principal stress p1, is:

4504. Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by_________________?
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A. Rankine formula

B. Rankine Grashoff formula

C. Marcus formula

D. Grashoff formula

4505. In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2, nominal reinforcement is provided at a pitch of________________?
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A. One and half lever arm of the section

B. One -half lever arm of the section

C. Lever arm of the section

D. One-third lever arm of the section

4506. According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is______________?
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A. Half of the width of the slab

B. Three-fourth of the width of the slab

C. Two -third of the width of the slab

D. Four-fifth of the width of the slab

4507. Steel bars are generally connected together to get greater length than the standard length by providing_______________?
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A. Hooked splice

B. Straight bar splice

C. All the above

D. Dowel splice

4508. The minimum clear cover for R.C.C. columns shall be_________________?
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A. Greater of 25 mm or diameter

B. Smaller of 25 mm or diameter

C. Smaller of 40 mm or diameter

D. Greater of 40 mm or diameter

4509. The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is______________?
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A. 20

B. 30

C. 25

D. 35

4510. If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a__________________?
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A. None of these

B. Simply supported beam

C. Cantilever beam

D. Continuous beam

4511. The load stress of a section can be reduced by______________?
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A. Increasing the total perimeter of bars

B. Replacing larger bars by greater number of small bars

C. Decreasing the lever arm

D. Replacing smaller bars by greater number of greater bars

4512. If is the net upward pressure on a square footing of side for a square column of side , the maximum bending moment is given by_________________?
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A. B.M = pb (b + a)/8

B. B.M = pb (b a)/4

C. B.M = pb (b a)/8

D. B.M = pb (c a)/4

4513. To ensure uniform pressure distribution, the thickness of the foundation, is__________________?
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A. Decreased gradually towards the edge

B. Kept uniform throughout

C. Kept zero at the edge

D. Increased gradually towards the edge

4514. Spacing of stirrups in a rectangular beam, is__________________?
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A. Decreased towards the centre of the beam

B. Increased at the ends

C. Increased at the centre of the beam

D. Kept constant throughout the length

4515. The pitch of the main bars in a simply supported slab, should not exceed its effective depth by_____________?
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A. Six times

B. Five times

C. Four times

D. Three times

4516. The minimum thickness of a flat slab is taken_________________?
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A. L/36 for end panels without drops

B. All the above

C. L/32 for end panels without drops

D. L/36 for interior panels without drop

4517. If is the uniformly distributed load on a circular slab of radius maximum positive radial moment at its centre, is__________________?
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A. 2WR/16

B. 3WR/16

C. WR/16

D. None of these

4518. An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam________________?
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A. Is safe in shear

B. Is safe with stirrups and inclined bars

C. Is safe with stirrups

D. Needs revision of section
4519. In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as___________________?
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A. All the above

B. A key

C. A rib

D. A cut-off wall

4520. After pre-stressing process is completed, a loss of stress is due to______________?
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A. Elastic shortening of concrete

B. Shrinkage of concrete

C. All the above

D. Creep of concrete

4521. The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept______________?
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A. 0.6

B. 0.9

C. 0.8

D. 0.7

4522. If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is____________________?
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A. ( h

B. [( + )/2] h

C. [( + )/4] h

D. [( )/2] h

4523. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is__________________?
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A. Rectangular

B. Trapezoidal

C. Square

D. Triangular

4524. The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
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A. m = 2800/3C

B. m = 3500/3C

C. m = 700/3C

D. m = 1400/3C

4525. on a circular slab of radius , the maximum radial moment at the centre of the If is the load slab, is WR/16_____________?
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A. t; NON OF THESE

B. 5WR/16

C. 3WR/16

D. 2WR/16

4526. longitudinal bars and lateral stirrups, is__________________?
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A. Stress in concrete area of concrete + Stress in steel area of steel

B. None of these

C. Stress in steel area of steel

D. Stress in concrete area of concrete

4527. The spacing of transverse reinforcement of column is decided by the following consideration_______________?
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A. Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column

B. Forty-eight times the diameter of transverse reinforcement

C. All the above

D. The least lateral dimension of the column

4528. If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre -stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is_______________?
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A. A/P

B. P/2A

C. 2A/P

D. P/A
4529. The width of the flange of a L-beam, should be less than______________?
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A. One- sixth of the effective span

B. Least of the above

C. Breadth of the rib + four times thickness of the slab

D. Breadth of the rib + half clear distance between ribs

4530. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of_____________________?
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A. h/2

B. h /4

C. h/3

D. 2h/3

4531. An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is__________________?
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A. Is safe with stirrups

B. Is safe with stirrups and inclined members

C. Needs revision of the section

D. Safe in shear
4532. A pre-stressed concrete member is preferred because___________________?
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A. Removal of cracks in the members due to shrinkage

B. Its dimensions are not decided from the diagonal tensile stress

C. All the above

D. Large size of long beams carrying large shear force need not be adopted

4533. As per IS : 456, the reinforcement in a column should not be less than________________?
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A. 0.5% and not more than 5% of cross-sectional area

B. 0.8% and not more than 8% of cross-sectional area

C. 0.6% and not more than 6% of cross-sectional area

D. 0.7% and not more than 7% of cross-sectional area

4534. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is__________________?
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A. 0.50%

4535. is the pre- stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is________________?
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A. f = (P/A) (Z/M)

B. f = (P/A) (M/Z)

C. f = (P/A) (M/6Z)

D. f = (A/P) (M/Z)

4536. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam_______________?
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A. Are bent up at suitable places to serve as shear reinforcement

B. Are bent down at suitable places to serve as shear reinforcement

C. Are curtailed if not required to resist the bending moment

D. Are maintained at bottom to provide at least local bond stress

4537. Thickened part of a flat slab over its supporting column, is technically known as_____________?
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A. Drop panel

B. None of these

C. Top of the column

D. Column head

4538. If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth D. of the footing from punching shear consideration, is____________________?
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A. D = W (a b)/4abq

4539. An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus_______________?
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A. UDL of wall

B. UDL of wall + load from the roof

C. Triangular load + load from the roof

D. Triangular load of the wall

4540. Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds_____________?
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A. 120 cm

B. 100 cm

C. 50 cm

D. 75 cm
4541. For M 150 grade concrete (1:2:4) the moment of resistance factor is_________________?
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A. 8.50

B. 5.8

C. 7.5

D. 0.87

4542. A very comfortable type of stairs is_______________?
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A. Dog legged

B. Straight

C. Open newel

D. Geometrical

4543. For a ribbed slab______________?
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A. Width of the rib shall not be less than 7.5 cm

B. Clear spacing between ribs shall not be greater than 4.5 cm

C. Overall depth of the slab shall not exceed four times the breadth of the rib

D. All the above
4544. In a pre-stressed member it is advisable to use________________?
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A. High strength concrete and high tensile steel

B. Low strength concrete but high tensile steel

C. High strength concrete only

D. Low strength concrete only

4545. Long and short spans of a two way slab are l and l and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. Accordingy to xRankine Grashoff theory___________________?
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A. (wx/wy) = (ly/lx)

B. None of these

C. (wx/wy) = (ly/lx)4

D. (wx/wy) = (ly/lx)

4546. If the length of a combined footing for two columns l metres apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where is the distance of centre of gravity of column loads______________?
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A. y = L/2 (l + )

B. y = L/2 + (l

C. y = L (l ) )

D. y = L/2 (l )
4547. carrying a uniformly distributed load per metre length is suspended at two A pile of length points, the maximum, B.M. at the centre of the pile or at the points of suspension, is_________________?
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A. WL/16

B. WL/47

C. WL/8

D. WL/24

4548. The minimum head room over a stair must be_______________?
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A. 200 cm

4549. The Youngs modulus of elasticity of steel, is__________________?
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A. 250 KN/mm2

B. 150 KN/mm2

C. 275 KN/mm2

D. 200 KN/mm2

4550. the column head support a flat slab, is generally kept The diameter of_____________?
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A. 5.0 cm larger than the diameter of the column

B. 4.0 cm larger than the diameter of the column

C. 0.25 times the diameter of the column

D. 0.25 times the span length