civil engineering MCQs – Page 92

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 Review each marked answer and report any item that may be outdated or unclear.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
4551. For initial estimate for a beam design, the width is assumed__________________?
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A. 1/15th of span

B. 1/25th of span

C. 1/20th of span

D. 1/30th of span
4552. If the shear stress in a R.C.C. beam is_______________?
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A. Equal or less than 5 kg/cm2, no shear reinforcement is provided

4553. The percentage of minimum reinforcement of the gross sectional area in slabs, is________________?
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A. 0.15 %

B. 0.10%

C. 0.18%

D. 0.12%

4554. If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is________________?
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A. WR/16

B. 3WR/16

C. Zero

D. 2WR/16

4555. If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by________________?
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A. D = 0.00775 aP

B. D = 0.07775 aP

C. D = 0.775 Pa

D. D = 0.0775 aP

4556. A raft foundation is provided if its area exceeds the plan area of the building by______________?
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A. 50 %

B. 40%

C. 20%

D. 10%

4557. The amount of reinforcement for main bars in a slab, is based upon___________________?
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A. Maximum bending moment

B. Minimum bending moment

C. Minimum shear force

D. Maximum shear force

4558. [A + (m 1)ASC] known as equivalent concrete area of R.C.C. is given by______________?
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A. Ultimate load method

B. Load factor method

C. None of these

D. Modular ratio method
4559. The ratio of the breadth to effective depth of a beam is kept_______________?
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A. 0.7

B. 0.75

C. 0.50

D. 0.25

4560. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt________________?
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A. Is over safe in shear

B. Is safe in shear

C. Needs redesigning

D. Is unsafe in shear
4561. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is_______________?
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A. 190 kg/cm2

B. 1400 kg/cm2

C. 230 kg/cm2

D. 260 kg/cm2

4562. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called________________?
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A. Over reinforced section

B. Critical section

C. Under-reinforced section

D. Economic section

4563. Cantilever retaining walls can safely be used for a height not more than_______________?
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A. 3 m

B. 5 m

C. 4 m

D. 6 m
4564. According to I.S. 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than______________?
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A. 75 cm

B. 30 cm

C. 20 cm

D. 40 cm

4565. As per I.S. 456 1978, the pH value of water shall be_______________?
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A. Equal to 6

B. Equal to 7

C. Not less than 6

D. Less than 6

4566. per unit run exerted by the Total pressure on the vertical face of a retaining wall of height retained earth weighing per unit volume, is___________________?
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A. wh [(1 )/2(1 + sin )]

B. wh [(1 )/(1 + sin )]

C. wh [(1 )/(1 + sin )]

D. wh [(1 )/3(1 + sin )]

4567. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is___________________?
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A. All the above

B. 40

C. 30

D. 45

4568. If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be_______________?
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A. Straight below centroidal axis

B. Straight above centroidal axis

C. Parabolic with convexity downward

D. Parabolic with convexity upward

4569. The advantage of reinforced concrete, is due to_______________?
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A. Economy because of less maintenance cost

B. Fire-resisting and durability

C. Monolithic character

D. All the above
4570. Post tensioning system_______________?
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A. Is economical for large spans and is adopted now a days

B. Was widely used in earlier days

C. Is not economical and hence not generally used

D. None of these
4571. The live load to be considered for an inaccessible roof, is______________?
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A. 200 kg/m2

B. 150 kg/cm 2

C. 75 kg/m2

D. Nil

4572. The live load to be considered for an accessible roof, is________________?
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A. 75 kg/m3

B. 150 kg/m 2

C. Nil

D. 200 kg/cm 2

4573. The length of lap in tension reinforcement should not be less than the bar diameter (actual tension / four times the permissible average bond stress) if it is more than_______________?
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A. 30 bar diameters

B. 36 bar diameters

C. 24 bar diameters

D. 18 bar diameters

4574. If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is_______________?
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A. 55

B. 40

C. 45

D. 50

4575. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than____________?
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A. 24 diameters from the centre of the column

B. 42 diameters from the outer edge of the column

C. 42 diameters from the inner edge of the column

D. 42 diameters from the centre of the column

4576. A part of the slab may be considered as the flange of the T-beam if__________________?
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A. All the above

B. It is built integrally with the beam

C. It is effectively bonded together with the beam

D. Flange has adequate reinforcement transverse to beam

4577. A retaining wall and is the horizontal earth pressure, the factor of safety If is weight of against sliding, is_____________?
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A. 1.5

B. 1.25

C. 1

D. 2

4578. For M 150 mix concrete, according to I.S. specifications, local bond stress, is_________________?
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A. 20 kg/cm2

B. 5 kg/cm2

C. 10 kg/cm 2

D. 15 kg/cm2

4579. A pre-stressed concrete member__________________?
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A. Possesses internal stresses

B. Is made of reinforced concrete

C. Is made of concrete

D. Is stressed after casting

4580. Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to__________________?
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A. Moment of the beam section about its neutral axis

B. Shear force

C. Distance of the C.G. of the area from its neutral axis

D. Area of the section

4581. The breadth of a ribbed slab containing two bars must be between______________?
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A. 6 cm to 7.5 cm

B. 10 cm to 12 cm

C. 8 cm to 10 cm

D. 12 cm to 15 cm

4582. For stairs spanning horizontally, the minimum waist provided is________________?
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A. 4 cm

B. 12 cm

C. 8 cm

D. 6 cm

4583. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is___________________?
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A. 17 cm2

B. 14 cm 2

C. 15 cm2

D. 16 cm2
4584. Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at________________?
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A. Supports

B. Quarter span

C. Every section

D. Mid span
4585. For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is_______________?
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A. wl/4

B. wl/12

C. wl/8

D. wl/16
4586. If the modular ratio is , steel ratio is and overall depth of a beam is , the depth of the critical neutral axis of the beam, is___________________?
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A. [m/(m + r)] d

B. [(r m)/m] d

C. [(m + r)/ m] d

D. [m/(m r)] d

4587. The shear reinforcement in R.C.C. is provided to resist__________________?
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A. Diagonal compression

B. Horizontal shear

C. Vertical shear

D. Diagonal tension
4588. Dimensions of a beam need be changed if the shear stress is more than_______________?
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A. 20 kg/cm2

B. 10 kg/cm2

C. 15 kg/cm2

D. 25 kg/cm2

4589. The maximum ratio of span to depth of a cantilever slab, is_______________?
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A. 8

B. 16

C. 12

D. 10

4590. For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is___________________?
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A. 3

B. 1

C. 2

D. 5

4591. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds_________________?
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A. 25

B. 10

C. 20

D. 15
4592. If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than____________________?
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A. 6 mm

B. 5 mm

C. 4 mm

D. 8 mm

4593. The advantage of a concrete pile over a timber pile, is_______________?
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A. No decay due to termites

4594. bending moment of a simply supported slab is M Kg.cm, the effective depth of the If the maximum slab is (where Q is M.R. factor)________________?
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A. M/100Q

B. M/ Q

C. M/Q)

D. (M/100Q)
4595. If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be________________?
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A. 8hp/ l

B. 8hl/p

C. 8hl/p

D. 8hp/l
4596. If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is_____________?
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A. 10 mm

B. 14 mm

C. 12 mm

D. 16 mm
4597. In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are______________?
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A. 12 legged

B. 8 legged

C. 6 legged

D. 10 legged

4598. If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment____________________?
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A. WL/6

B. WL/2

C. WL/8

D. WL/4

4599. is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is_________________?
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A. f = (P/A) + (M/6Z)

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

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

D. f = (P/A) + (M/Z)
4600. Pick up the true statement from the following?
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A. In the absence of beams, it is easier to install piping

B. All the above

C. In the absence of beams, it is easier to paint

D. Plain ceiling provides the best property diffusing light