civil engineering MCQs – Page 229

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 Review each marked answer and report any item that may be outdated or unclear.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