1. If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than
Correct : A. 27 mm
2. Which of the following statement is correct?
Correct : D. all of the above
3. For highly loaded columns, the concrete mix used is of proportion
Correct : A. 1 ; 1 : 2
4. The importance of batching is to obtain
Correct : D. all of these
5. Harshness in concrete is due to the excess of
Correct : C. middle sized particle
6. Bulking of sand is
Correct : C. increase in volume of sand due to presence of moisture upto certain extent
7. If the fineness modulus of sand is 3, then the sand is graded as
Correct : D. coarse sand
8. More water should not be added in the concrete mix, as to increase
Correct : C. water-cement ratio
9. The concrete mix is said to be workable if it has
Correct : D. all of these
10. The maximum particle size of fine aggregate is
Correct : B. 4.75 mm
11. The size of an aggregate is determined by length gauge.
Correct : B. No
12. The aggregate is said to be flaky when
Correct : A. its least dimension is three-fifth of its mean dimension
13. In designing a ware-house, it is assumed that
Correct : D. all of the above
14. The concrete
Correct : A. should
15. The strength of concrete using air entraining cement gets reduced by
Correct : B. 10 to 15%
16. A compaction factor of 0.88 indictes that the workability of concrete mix is
Correct : C. medium
17. In order to prepare a test specimen, it is necessary to
Correct : D. all of the above
18. In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about
Correct : B. 30%
19. The usual proportion of ingredients in plain cement concrete is
Correct : A. Portland cement (1 part), clean sand (1
20. The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.
Correct : A. True
21. At freezing point, the concrete sets easily.
Correct : B. Wrong
22. Too much finencess of cement
Correct : D. both (a) and (b)
23. In making precast structural units for partition and wall lining purposes, the concrete should be
Correct : C. light-weight concrete
24. Calcareous material used in the manufacture of cement consists of
Correct : D. all of these
25. Los Angeles machine is used to perform the abrasion resistance test of an aggregate.
Correct : A. Right
26. The workability of concrete mix increases with the increase in moisture content.
Correct : A. Agree
27. Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil.
Correct : A. Agree
28. According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that
Correct : D. all of the above
29. The 'first-in, first-out' rule should eb applied when cement hags are to be removed from the ware-house.
Correct : A. True
30. The placement of concrete should be discontinued during rainy periods
Correct : A. Yes
31. The mixer, which produces a steady stream of concrete as long as it is in operation, is known as
Correct : C. continuous mixer
32. The cement concrete, from which entrained air and excess water are removed after placing it in position, is called
Correct : A. vacuum concrete
33. Which of the following statement is wrong?
Correct : D. none of the above
34. In the slump test, the maximum size of the aggregate should not exceed 38 mm.
Correct : A. Correct
35. Hydration of cement evolves heat.
Correct : A. True
36. Pezzolana is essentially a silicious material containing clay upto
Correct : D. 80%
37. An aggregate is said to be
Correct : C. cyclopean
38. When the sand is fully saturated, its volume is
Correct : A. equal to
39. The resistance of an aggregate to sudden compressive forces is called impact value.
Correct : A. Correct
40. The controlled concrete is used for
Correct : D. all the seven grades of concrete mix
41. The admixtures are added in concrete to
Correct : D. all of the above
42. The aggregate is said to be elongated when
Correct : D. its length is equal to 1.8 times its mean dimension
43. The maximum particle size of coarse aggregate is
Correct : D. 75 mm
44. The cement, widely used in retaining walls, is
Correct : B. low heat cement
45. The presence of tricalcium silicate in cement
Correct : A. hydrates the cement rapidly
46. If sea water is used for preparing concrete mix, it
Correct : D. all of these
47. Which of the following statement is correct?
Correct : D. all of the above
48. Vibrated concrete needs
Correct : A. less
49. Alumina in the cement lowers the clinkering temperature.
Correct : A. Agree
50. The concrete can be lifted by pumps through a maximum vertical distance of
Correct : D. 50 m
51. The diameter of the pipe line used for transportation of concrete by pumps should not exceed
Correct : C. 30 cm
52. The inert mineral material used for the manufacture of mortars and concretes is
Correct : C. aggregate
53. Which of the following cements is expected to have the highest compressive strength after 3 days.
Correct : C. high alumina cement
54. In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt in a
Correct : C. rotary kiln
55. The knowledge of a standard consistency of a cement paste is essential to perform
Correct : D. all of these
56. The placing of concrete should start width-wide in reinforced cement concrete slabs from one end.
Correct : A. True
57. The separation of water or water-cement mixture from the freshly mixed concrete is known as bleeding.
Correct : A. True
58. The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as
Correct : B. soundness
59. The concrete in which preliminary tests are performed for designing the mix is called
Correct : B. controlled concrete
60. The type of lime used in lime concrete is
Correct : D. hydraulic lime
61. Segregation in concrete results in
Correct : D. all of these
62. The sum of percentages of all deleterious materials in the aggregate shall not exceed
Correct : A. 5%
63. In Vicat's apparatus, the diameter of Vicat plunger is
Correct : B. 10 mm
64. Tricalcium silicate develops strength in cement for first 7 days.
Correct : A. Yes
65. Which of the following statement is correct?
Correct : D. all of the above
66. The presence of dicalcium silicate in cement
Correct : D. all of these
67. The usual proportion of ingredients in reinforced cement concrete is
Correct : B. Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts)
68. Trowelling should be finished on the same day of its laying operation.
Correct : A. Yes
69. The continuous strain, which the concrete undergoes due to application of external loads, is called
Correct : D. creep
70. The value of bulk density for angular and flaky aggregates is
Correct : B. less
71. The development of first 28 days strength is on account of the hydration of
Correct : B. tricalcium silicate
72. The resistance of an aggregate to the effect of hydration of cement and weather is called
Correct : D. soundness
73. For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed.
Correct : B. 15 mm
74. The slump whould not exceed 50 mm when compacting concrete with vibrators.
Correct : A. Agree
75. The bulk density of an aggregate is the weight required to fill a container of unit volume.
Correct : A. Agree
76. Which of following proportion of different ingredient of concrete mix confirm to the arbitrary mothod of mixing?
Correct : C. 1 : 4 ; 8
77. The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called
Correct : A. screeding
78. The apparent specific gravity of an aggregate is defined as
Correct : A. the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
79. In concrete walls, construction joints should be provided at the
Correct : D. all of these
80. According to IS : 383 - 1970, a good a aggregate for concrete construction should be
Correct : D. all of these
81. If the effective plan area of a warehouse is 54 m2, and the maximum height of pile permitted is 2.7 m, then the number of cement bags to be stord is
Correct : D. 2700
82. A good concrete should be subjected to
Correct : B. minimum
83. The hardening is the phenomenon by virtue of which
Correct : C. the cement paste sets and develops strength
84. Under normal circumstances, the beam soffits may be removed after
Correct : B. 7 days
85. The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 is
Correct : B. 1 ; 1.5 : 3
86. The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is
Correct : C. 25 N/mm2
87. The measuring 50 litres of aggregate, the inner dimensions of a farma should be
Correct : D. 31 cm x 31 cm x 52 cm
88. The test conducted in the laboratory on the specimen made out of trial concrete mix is called
Correct : A. preliminary test
89. The capcity of a ware-house depends upon the
Correct : D. both (a) and (b)
90. For high degree of workability, the compaction factor is
Correct : D. 0.95
91. The ratio of the volume of moist sand to the volume of dry sand is known as
Correct : C. bulking factor
92. The object of curing is to
Correct : D. all of these
93. The process of hardening the concrete mixes by keeping its surface moist for a certain period is called
Correct : B. curing
94. The prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the
Correct : D. all of the above
95. According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of
Correct : C. 1 ; 3
96. Which of the following statement is correct?
Correct : D. all of the above
97. Lime when added in excess quantity
Correct : D. both (a) and (b)
98. The standard sand now used in India is obtained from
Correct : A. Ennore (Chennai)
99. Initial setting time of ordinary Portland cement is
Correct : B. 30 min
100. The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds