design of concrete structures MCQs – Page 2

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

design of concrete structures Mcqs

21. A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D. is less than__________________?
0

A. 2.5

B. 3

C. 1.5

D. 2

22. The percentage of voids in cement is approximately_______________?
0

A. 60%

B. 40%

C. 25%

D. 80%

23. The fineness modulus of fine aggregate is in the range of______________?
0

A. 2.0 to 3.5

B. 3.5 to 5.0

C. 6.0 to 8.5

D. 5.0 to 7.0

24. Ratio of permissible stress in direct compression and bending compression is______________?
0

A. between 1.5 and 2.0

B. less than 1

C. greater than 2

D. between 1 and 1.5

25. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone_________________?
0

A. bond stress

B. tensile stress

C. shear stress

D. compressive stress

26. According to IS : 456-1978, the fiexural strength of concrete is________________?
0

A. inversely proportional to compressive strength

B. inversely proportional to square root of compressive strength

C. directly proportional to square root of compressive strength

D. directly proportional to compressive strength

27. A higher modular ratio shows____________?
0

A. higher tensile strength of steel

B. lower compressive strength of concrete

C. lower tensile strength of steel

D. higher compressive strength of con-crete

28. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than________________?
0

A. 0.3

B. 1

C. 0.15

D. 0.12

29. Maximum percentage reinforcement in case of slabs is limited to___________________?
0

A. 8

B. 2

C. 4

D. 6

30. In order to obtain the best workability of concrete, the preferred shape of aggregate is_______________?
0

A. rounded

B. all of the above

C. elongated

D. angular

31. The property of the ingredients to separate from each other while placing the concrete is called____________?
0

A. shrinkage

B. segregation

C. bulking

D. compaction

32. Minimum thickness of load bearing RCC wall should be_____________?
0

A. 100 mm

B. 50 mm

C. 150 mm

D. 200 mm

33. The diameter of ties in a column should be_______________?
0

A. more than or equal to 5 mm

B. more than or equal to one fourth of diameter of main bar

C. more than 5 mm but less than one-fourth of diameter of main bar

D. more than 5 mm and also more than one-fourth of diameter of main bar

34. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called________________?
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A. over-reinforced beam

B. balanced beam

C. none of the above

D. under-reinforced beam

35. Air entrainment in the concrete increases________________?
0

A. strength

B. the unit weight

C. workability

D. the effects of temperature variations

36. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by_______________?
0

A. 10%

B. 40%

C. 30%

D. 20%

37. To determine the modulus of rupture, the size of test specimen used is_______________?
0

A. 100 x100 x700 mm

B. 150 x150 x700 mm

C. 100 x100 x500 mm

D. 150 x150 x500 mm

38. 1% of voids in a concrete mix would reduce its strength by about______________?
0

A. 20%

B. 5%

C. 15%

D. 10%

39. For a reinforced concrete section, the shape of shear stress diagram is_______________?
0

A. wholly rectangular

B. parabolic above neutral axis and rectangular below neutral axis

C. wholly parabolic

D. rectangular above neutral axis and parabolic below neutral axis

40. As compared to ordinary portland cement, use of pozzuolanic cement_______________?
0

A. increases shrinkage

B. reduces workability

C. increases strength

D. increases bleeding

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