2. After 28 days of curing, cement gains have been found to have hydrated to a depth of only…..u.
Correct : C. 4
3. Total…….. % of water by weight of water by weight of cement is required for complete
hydration.
Correct : B. 38
4. Hydration of cement is due to chemical action of water with
Correct : D. All the above.
5. Proper proportioning of concrete, ensures
Correct : D. all the above
6. An aggregate is said to be flaky if its least dimension is less than
Correct : C. 3/5th of mean dimension
7. A small quantity of …………. % of gypsum is added to prevent flash-setting of the cement.
Correct : B. 2 to 3
8. Highest oxide composition present in cement is……
Correct : D. Lime
9. First 7 days strength in cement is due to….. Bogue compound.
Correct : A. C3S
10. Heat of hydration of C3S at 90 days is ………. cal/g
Correct : B. 104
11. …………refers to the gain of strength of a set cement paste.
Correct : B. Hardening of cement
12. For long time storage ……..cement used.
Correct : C. Hydrophobic
13. Repair of air-field pavement use……
Correct : B. Very high Strength cement
14. Note more than ……. bags should be kept one above other.
Correct : C. 14
15. For Fineness test ……. micron sieve is use.
Correct : D. 90
16. The weight of residue should not exceed ……. for OPC.
Correct : A. 10 %
17. For consistency test vicat plunger having ……. dia and …….. Length is used.
Correct : B. 10 mm & 50 mm
18. For OPC Value of IST And FST is…… .
Correct : A. 30 m & 600 m
19. For compressive strength test of cement ………. water is added.
Correct : C. p/4 + 3
20. Undesirable expansion of some of constituents of cement after setting is known as……… .
Correct : B. unsoundness
21. Density of light weight aggregate concrete is about …….. kg/m3
.
Correct : C. 1200
22. Material between…………… is classified as silt.
Correct : D. 0.06 mm to 0.002 mm
23. Angular aggregate having percentage of voids ranging from……….
Correct : C. 38 to 40
24. In crushing value test of aggregate, gradually compressive load of….. Tons is apply.
Correct : A. 40
25. Specific gravity of natural aggregate lie between……
Correct : C. 2.6 to 2.8
26. Coarse aggregates absorbs…….. % of moisture.
Correct : B. 0.5 to 1
27. To control alkali aggregate reaction restricting alkali content in cement below……%
Correct : D. 0.6
28. If the actual grading curve is steeper than the specified grading curve, it indicates an excess of
……..particle size.
Correct : C. medium
29. Fineness modulus of fine sand is…… .
Correct : A. 2.2 – 2.6
30. Permissible limit organic solids in water is……..mg/l
Correct : C. 200
31. Bigger size of aggregate will give higher workability.
Correct : A. True
32. To measure workability of concrete in field …………….test is used.
Correct : C. Slump test
33. Steel tamping rod of 0.6m length and 16 mm diameter is used for tamping of concrete.
Correct : B. True
34. Types of slump is…..
Correct : D. All of above
35. 25 to 75 mm workability of concrete, indicate
Correct : C. Low workability
36. In very low category of degree of workability determination by compacting factor will be more
appropriate.
Correct : A. True
37. Compacting factor test should be made for concrete with maximum size of aggregate not
exceeding 40 mm.
Correct : A. True
38. The value of flow % may range anything from 0 to …. %
Correct : D. 150
39. Separating out of the ingredients of concrete mix from concrete is known as……… .
Correct : A. Segregation
40. Water from concrete comes out to the surface of the concrete is known as……….
Correct : B. bleeding
41. Main causes of bleeding :
Correct : D. All of this
42. The formation of cement paste at the surface is known as laitance.
Correct : A. True
43. Workability of concrete is……. to the w/c.
Correct : A. proportional
44. Workability of concrete is …….to the strength of concrete.
Correct : B. inversely proportional
45. Good method for proportioning the materials.
Correct : A. Weight batching
46. In Volume batching 1 bag cement =
Correct : A. 35 lit
47. In volume batching………. % of bulking is take into account.
Correct : C. 20
48. Density of water is 1 kg/liter.
Correct : A. True
49. In hand mixing …….. % more cement is added in mix.
Correct : D. 10
50. Concrete mixer are generally designed to run at a speed of ……….. Revolution per minute.
Correct : C. 15 to 20
51. For proper mixing about…………. revolution are required.
Correct : D. 25 to 30
52. The process of mixing, transporting, placing and compacting concrete should not take more
than ……. min any case.
Correct : A. 90
53. Commonly use retarders is……
Correct : D. All of the above
54. Inert material of a cement concrete mix, is
Correct : C. aggregate
55. Placing of concrete should preferably be done at a temperature of
Correct : D. 27 ± 2°C
56. The aggregate impact value of the aggregate used in
Correct : D. all the above.
57. On a grading curve, the gap grading is represented by
Correct : A. a horizontal line
58. Bulking of sand is
Correct : D. swelling of sand when wetted
59. Curing of pavements, floors, roofs and slabs, is done by
Correct : B. ponding method
60. Pick up the incorrect statement from the following:
Correct : A. With passage of time, the strength of cement increases
61. The surface where two successive placements of concrete meet, is known as
Correct : C. Construction joint
62. An excess of flaky particles in concrete aggregates
Correct : D. all the above
63. I.S.I. has specified the full strength of concrete after
Correct : D. 28 days
64. The minimum percentage of chemical ingredient of cement is that of
Correct : A. magnesium oxide
65. The specifications of a cement bag for storage, are
Correct : D. all the above
66. The bulk density of aggregates, depends upon
Correct : D. all the above.
67. The concrete mix which causes difficulty in obtaining a smooth finish, possess
Correct : C. harshness
68. An aggregate is known as cyclopean aggregate if its size is more than
Correct : D. 75 mm
69. The main object of compaction of concrete, is:
Correct : D. all the above
70. Concrete gains strength due to
Correct : C. hydration of cement
71. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
Correct : C. 40.5 mm
72. Log Angles machine is used to test the aggregate for
Correct : C. abrasion resistance
73. Pozzolanic properties exist in
Correct : D. all the above
74. Workability improved by adding
Correct : D. all the above
75. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
Correct : A. M 10
76. Gypsum is added for
Correct : C. controlling setting time
77. Cement used for normal concrete construction, is obtained by burning a mixture of
Correct : D. silicious, argillaceous and calcareous materials
78. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
Correct : B. 25 times
79. Efflorescence in cement is caused due to an excess of
Correct : D. alkalis
80. Slump test of concrete is a measure of its
Correct : A. consistency
81. Pick up the incorrect statement applicable to the field test of good cement.
Correct : D. All the above
82. The most useless aggregate is one whose surface texture is
Correct : C. glassy
83. The top diameter, bottom diameter and the height of a slump mould are :
Correct : A. 10 cm, 20 cm, 30 cm
84. For concreting tunnel linings, transportation of concrete is done by
Correct : D. pumps
85. Admixture which cause early setting and hardening of concrete are called …
Correct : B. accelerators
86. As compared to ordinary Portland cement, high alumina cement has
Correct : A. higher initial setting time but lower final setting time
87. Maximum permissible limit of magnesia content in OPC is…
Correct : B. 6%
88. Reduction in the quantity of mixing water which is possible by the use of plasticizers and
admixture varies from
Correct : B. 5% to 15%
89. Which of the following types of concrete mixture is most commonly used in precast concrete
factories?
Correct : B. pan type mixer
90. According to IS : 456-1978 minimum period stipulated for most curing of concrete using ordinary Portland cement is
Correct : B. 7 days
91. For reinforced concrete exposed to sulphate attack minimum grade required is
Correct : C. M20
92. The deterioration of concrete take place due to.
Correct : D. All of the above
93. Cement content should be such that concrete has sufficient alkalinity (PH value).
Correct : A. True
94. For sea water concreting …………. cement shall be used.
Correct : D. All of above
95. Durability of concrete can be improved by impregnation of …………… in the voids of concrete.
Correct : A. polymer
96. What do you mean by admixtures?
Correct : A. Ingredients which are added to in cement before or after concrete mix
97. Super plasticizers reduce water requirement by ___________ %.
Correct : A. 12-30
98. Damp proofing is done with a __________ based mixture.
Correct : B. Tar
99. What is water proofing admixtures?
Correct : A. Water repellent materials
100. Which one is not a chemically active pore filling material?