2. The shuttering of a hall measuring 4 m × 5 m, can be removed after
Correct : B. 7 days
3. The approximate value of the ratio between direct tensile strength and flexural strength is
Correct : B. 0.5
4. An aggregate is said to be flaky if its least dimension is less than
Correct : C. 3/5th of mean dimension
5. Workability improved by adding
Correct : D. all the above
6. Workability of concrete is inversely proportional to
Correct : A. time of transit
7. Inert material of a cement concrete mix, is
Correct : C. aggregate
8. If a beam fails in bond, then its bond strength can be increased most economically by
Correct : B. using thinner bars but more in number
9. Pick up the incorrect statement from the following:
Correct : A. a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
10. Ordinary Portland cement is manufactured from
Correct : B. gypsum and lime
11. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is
not less than
Correct : B. 0.12
12. Addition of pozzolana to cement
Correct : D. none of these
13. If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water
cement ratio is 0.6, the weight of water required for harsh mix, is
Correct : C. 12 kg
14. The minimum cover to the ties or spirals should not be less than
Correct : C. 25 mm
15. According to Water-Cement Ratio Law, the strength of workable plastic concrete
Correct : D. all the above
16. Sands of zone I are:
Correct : A. course
17. According to Whitney's theory, ultimate strain of concrete is assumed to be
Correct : C. 0.3 %
18. The condition not applicable to water cement ratio law, is
Correct : B. concrete specimens may be tested at any temperature
19. If the slump of a concrete mix is 60 mm, its workability is
Correct : C. medium
20. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work
respectively should not be less than
Correct : B. 42 mpa and 35 mpa
21. The void ratio of
Correct : D. all the above
22. According to IS : 382-1963, a good aggregate should be
Correct : D. all the above
23. The compressive strength of 100 mm cube as compared to 150 mm cube is always
Correct : B. more
24. The diameter of the Vicat plunger is 10 mm and its length varies from
Correct : C. 40 mm to 50 mm
25. Gypsum is added for
Correct : C. controlling setting time
26. Modulus of elasticity of steel as per IS: 4561978 shall be taken as
Correct : C. 200 kn/mm²
27. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
Correct : B. 150 kg/cm2
28. The cement becomes useless if its absorbed moisture content exceeds
Correct : D. 5 %
29. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
Correct : B. 150 mm
30. For preparing a test-specimen, it is necessary
Correct : D. all the above
31. For a good concrete
Correct : D. all the above
32. The process of hardening the concrete by keeping its surface moist is known
Correct : C. curing
33. For the construction of the retaining structures, the type of concrete mix to be used, is
Correct : C. 1 : 1½ : 3
34. The produce impermeable concrete
Correct : D. all the above
35. Pozzolanic properties exist in
Correct : D. all the above
36. A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth
(1/D) is less than
Correct : C. 2.5
37. Pick up the correct statement from the following:
Correct : D. all the above
38. If fineness modulus of sand is 2.5, it is graded as
Correct : B. fine sand
39. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
Correct : C. 32 liters
40. The increased cohesiveness of concrete, makes it
Correct : A. less liable to segregation
41. Concrete is unsuitable for compaction by a vibrator if it is
Correct : D. plastic
42. In order to obtain the best workability of concrete, the preferred shape of aggregate is
Correct : A. rounded
43. Hydration of cement is due to chemical action of water with
Correct : D. all the above
44. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be
flaky if its least dimension is less than
Correct : D. 13.5 mm
45. Approximate value of shrinkage strain in concrete, is
Correct : B. 0.0003
46. For quality control of Portland cement, the test essentially done is
Correct : D. all the above
47. Strength of concrete with passage of time
Correct : A. increases
48. Which of the following statements is incorrect?
Correct : D. none of the above
49. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a
temperature between
Correct : D. 1400° and 1500°c
50. In a pile of length , the points of suspension from ends for lifting it are located at
Correct : A. 0.207 l
51. Curing a concrete for long period ensures better
Correct : D. all the above
52. Batching error means inaccuracy in the quantity of
Correct : D. all the above
53. If the storey height is equal to length of RCC wall, the percentage increase in strength is
Correct : B. 10
54. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P)
of fine aggregates to combined aggregates, is
Correct : B. p = [(x - z)/(z - y)] × 100
55. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the
beam is called
Correct : C. over-reinforced beam
56. Proper proportioning of concrete, ensures
Correct : D. all the above
57. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is
given by
Correct : B. fcr > fcs > fcl
58. Air entrainment in the concrete increases
Correct : A. workability
59. Construction joints are provided
Correct : D. all the above
60. Maximum distance between expansion joints in structures as per IS: 456 1978 is
Correct : C. 45 m
61. Ordinary concrete is not used for concrete grade
Correct : D. m 400
62. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the
meridional force is always
Correct : C. compressive
63. An aggregate is said to be flaky, if its least dimension is less than
Correct : C. 3/5 mean dimension
64. While designing an air entrained concrete
Correct : D. all the above
65. Minimum thickness of load bearing RCC wall should be
Correct : B. 100 mm
66. M 150 grade of concrete approximates
Correct : B. 1 : 1 :2 mix
67. Permissible compressive strength of M 300 concrete grade is
Correct : D. 300 kg/cm2
68. Strength of concrete increases with
Correct : B. increase in fineness of cement
69. For ensuring quality of concrete, use
Correct : C. graded aggregates
70. In working stress design, permissible bond stress in the case of deformed bars is more than that in
plain bars by
Correct : D. 40 %
71. Workability improved by adding
Correct : D. all the above
72. The rock which is not calcareous, is:
Correct : D. none of these
73. A T-shaped retaining wall mainly consists of
Correct : C. three cantilevers
74. Pick up the correct statement from the following:
Correct : D. all the above
75. The fineness modulus of fine aggregate is in the range of
Correct : A. 2.0 to 3.5
76. After casting, an ordinary cement concrete on drying
Correct : C. shrinks
77. The most commonly used admixture which prolongs the setting and hardening time is
Correct : A. gypsum
78. For given water content, workability decreases if the concrete aggregates contain an excess of
Correct : D. all the above
79. The process of proper and accurate measurement of concrete ingredients for uniformity of
proportion, is known
Correct : D. batching
80. The load factors for live load and dead load are taken respectively as
Correct : B. 2.2 and 1.5
81. The mixture of different ingredients of cement, is burnt at
Correct : C. 1400°c
82. In case of hand mixing of concrete, the extra cement to be added is
Correct : B. 10 %
83. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage
of water is,
Correct : B. 25 %
84. The percentage of voids in cement is approximately
Correct : B. 40 %
85. Water required per bag of cement, is
Correct : D. 35 kg
86. The recommended value of modular ratio for reinforced brick work is
Correct : C. 40
87. For an ordinary Portland cement
Correct : C. initial setting time is not less than 30 minutes
88. The ratio of the diameter of reinforcing bars and the slab thickness is
Correct : D. 1/8
89. Pozzolana cement is used with confidence for construction of
Correct : D. all the above
90. Pick up the correct statement from the following:
Correct : D. both (b) and (c)
91. The operation of removing humps and hollows of uniform concrete surface, is known as
Correct : B. screeding
92. 1% of voids in a concrete mix would reduce its strength by about
Correct : A. 5 %
93. For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical
deflection limits is
Correct : B. 75 mm
94. The most useless aggregate is one whose surface texture is
Correct : C. glassy
95. The shrinkage of concrete
Correct : D. all the above
96. The maximum thickness of concrete floor of a cement warehouse, is
Correct : D. 25 cm
97. Too wet concrete may cause
Correct : D. all the above
98. Maximum percentage reinforcement in case of slabs is limited to
Correct : B. 4
99. The commonly used material in the manufacture of cement is
Correct : C. lime stone
100. According to I.S. : 456, the number of grades of concrete mixes, is