rcc structures design MCQs – Page 2

Practise focused rcc structures design questions with marked answers for exam preparation and subject revision.

rcc structures design Mcqs
21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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
36. 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

37. 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

38. 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

39. 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

40. 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