2. What is the amount used of plasticizers in cement by weight?
Correct : B. 1-.4%
3. What is the allowed reduction of water with super plasticizers without reducing workability?
Correct : C. 30%
4. What is accelerator?
Correct : A. Which speed up the initial set of concrete
5. What is retender?
Correct : B. Which delays the initial set of concrete
6. NaOH is the example of retenders.
Correct : B. False
7. Pick up the correct statement from the following.
Correct : C. Gypsum acts as a retarders
8. Retarders used at grouting oil wells, where temperature is about _____________ oC.
Correct : C. 200
9. Silica fume is ______________
Correct : C. More reactive
10. What is the content of SiO2 in fly ash?
Correct : A. 30-60%
11. Air entrainment in concrete increases ___________
Correct : B. Workability
12. What is curing?
Correct : B. Hydration
13. What is the gel/space ratio?
Correct : C. Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores
14. Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here Wo stands for?
Correct : D. Volume of mixing water in ml
15. This strain increases over time due to _________
Correct : A. Creep
16. If the stress is removed, the specimen shows an instantaneous recovery strain ___ the elastic strain on loading.
Correct : B. Lower than
17. Creep ___ as the age of application of load _____
Correct : D. Decrease, increase
18. Shrinkage is the reduction in the volume of a fresh hardened concrete exposed to ambient temp
and humidity.
Correct : A. True
19. Durability of concrete is proportional to _________
Correct : D. Cement aggregate ratio
20. For concrete exposed to a very aggressive environment the w/c should be lower than __________
Correct : C. 4
21. The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack.
Correct : C. Low
22. The continuous strain, which the concrete undergoes due to application of external loads, is called __________
Correct : D. Creep
23. Harshness in concrete is due to the excess of _____________
Correct : C. Middle sized particle
24. __________ has designated the concrete mixes into a number of grades as M10, M15.
Correct : A. IS 456-2000
25. What is the approx. mix proportion for M10?
Correct : A. 1:3:6
26. Quality control helps to ___________ the risks of overdesign that ___________ the overall cost.
Correct : D. Minimize, Decrease
27. The cement concrete, from which entrained air and excess water are removed after placing it in position, is called ________
Correct : A. Vacuum concrete
28. The light-weight concrete is prepared by ____________
Correct : B. Using coke-breeze, slag as aggregate in the concrete
29. Aerated Concrete is ______________
Correct : D. Light weight
30. No fines concrete is manufactured by _____________
Correct : B. By eliminating no fines materials from normal concrete
31. Density of no fines concrete with light weight aggregate vary from ________ kg/m3.
Correct : B. <300
32. Diameter of Round Steel Fiber lies in the range of ________ mm.
Correct : B. .25-.75
33. Air contents should be _________ % by volume.
Correct : C. 3-4
34. Which one is not used as air entraining agents?
Correct : A. Alumina
35. What is wet process?
Correct : C. Grinding and mixing of the raw materials in their wet state
36. Excess in lime causes _______
Correct : D. The cement to expand and disintegrate
37. Silica in excess causes ________
Correct : A. The cement to set slowly
38. Alumina in excess causes _________
Correct : A. Reduces the strength of the cement
39. Which compound gives the colour to the cement?
Correct : C. Iron Oxide
40. Which cement contains high percentage of C3S and less percentage of C2S?
Correct : A. Rapid Hardening Cement
41. When concrete is to be laid under water ___________ is to used.
Correct : C. Quick Setting Cement
42. Which of the following is correct for Low Heat Cement?
Correct : B. Heat of hydration is reduced by tri calcium aluminate content
43. Which cement is used in sewage and water treatment plants?
Correct : C. Sulphate Resisting Cement
44. Which cement is used for mainly building construction where strength required with age?
Correct : C. Portland Pozzolana Cement
45. Which cement is used for artificial marble?
Correct : C. Coloured Cement
46. Which cement is used to create bond with old concrete surface?
Correct : B. Expansive Cement
47. Which cement is used to store for longer duration in wet climatic conditions?
Correct : C. Hydrophobic Cement
48. Which cement is used for the construction of water-retaining structure like tanks, reservoirs,
retaining walls, swimming pools, dams, bridges, piers etc?
Correct : A. Waterproof Portland cement
49. ____ Cement is used for formwork that can be removed earlier and reused in other areas which
save the cost of formwork.
Correct : A. Rapid Hardening Cement
50. Which cement is mainly used for interior and exterior decorative works?
Correct : B. Colored Cement
51. Which cement is used for works economic where considerations is predominant?
Reservoirs, retaining walls, swimming pools, dams, bridges, piers etc.
Correct : D. Blast Furnace Slag Cement
52. How many times in each layer of concrete rodded in a slump cone?
Correct : B. 25
53. If L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20oC and L2=Measurement taken after 3 hours of immersion in water at boiling temperature. Then what is soundness of cement?
Correct : C. L1-L2
54. Which of the following option is correct?
Correct : A. Standard consistency (%) = (wt of water added/ wt of cement) *100
55. According to geological origin, aggregates is/are classified into __________ types.
Correct : B. 2
56. Crushed stone, gravel and ordinary sand are examples of ___________
Correct : B. Normal-weight aggregate
57. Which type of aggregate is shown below?
Correct : C. Flaky aggregate
58. The rock which is not calcareous, is :
Correct : D. Laterite
59. The main object of compaction of concrete, is:
Correct : D. all the above.
60. Grading of aggregates should be continuous for
Correct : A. lean
61. The aggregates of
Correct : B. angular
62. Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly?
Correct : B. silica
63. An aggregate having all the pores filled with water but having dry surface is called
Correct : C. saturated surface dry aggregate
64. The internal friction between the ingredients of concrete is minimised by
Correct : D. all of these
65. The light-weight concrete is prepared by
Correct : B. using coke-breeze, cinder or slag as aggregate in the concrete
66. For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is
Correct : B. screed vibrator
67. The surface moisture of aggregates increases the water-cement ratio in the mix and thus
Correct : B. decreases
68. For compacting large sections of mass concrete in structures, the type of vibrator used is
Correct : A. internal vibrator
69. The presence of
Correct : A. sodium carbonate and bicarbonate
70. The tetra calcium alumino ferrite in cement has
Correct : B. poor
71. For reinforced concrete, the aggregate used is
Correct : D. all of these
72. The lime concrete has
Correct : A. less
73. The steel mould used for slump test is in the form of a
Correct : C. frustrum of a cone
74. In order to avoid segregation, the concrete should not be thrown from a height.
Correct : A. Agree
75. Water cement ratio may be defined as the ratio of
Correct : B. weight of water to that of cement in a concrete mix
76. Low heat cement contains more lime than ordinary Portland cement.
Correct : B. False
77. For concreting of tunnel lining, the concrete is transported by
Correct : A. pumps
78. For the improvement of workability of concrete, the shape of aggregate recommended is
Correct : C. round
79. Which of the following statement is correct?
Correct : D. all of the above
80. For a structure subjected to the action of sea water, the cement used is
Correct : C. high alumina cement
81. For high degree of workability, the slump value should vary between
Correct : D. 80 to 100 mm
82. The term 'ware-hourse pack' means
Correct : C. pressure compaction of bags on lower layers
83. The length of Vicat plunger in Vicat's apparatus varies from
Correct : C. 40 to 50 mm
84. The cement concrete prepared by mixing aluminium in it, is called
Correct : D. any one of the above
85. Plain cement concrete is strong in taking
Correct : B. compressive stress
86. As per IS : 459-1978, the concrete mixes are designated into
Correct : D. 7 grades
87. The factor which effect the quality of compaction, is
Correct : D. all of these
88. The top diameter, bottom diameter and height of the mould used for slump test are respectively
Correct : A. 100 mm, 200 mm, 300 mm
89. The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as
Correct : B. coarse aggregate
90. The rate of hydration is
Correct : A. directly
91. Weight batching is done by
Correct : D. all of these
92. The first compound which reacts with water when mixed with cement is tricalcium aluminate.
Correct : A. Correct
93. An aggregate which may contain some moisture in the pores but having dry surface is known as
Correct : B. dry aggregate
94. Proper curing of cement concrete, is good for its
Correct : D. all of these
95. Hydration of cement is due to the chemical action of water with
Correct : D. all of these
96. The cement concrete in which high compressive stresses are artificially induced before its actual use, is called
Correct : C. prestressed cement concrete
97. The fineness modulus of an aggregate is roughly proportional to
Correct : C. average size of particles in the aggregate
98. The water used for ordinary concrete is equal to 5% by weight of aggregate plus
Correct : C. 30%
99. Which of the following statement is wrong?
Correct : D. all of the above
100. The sound absorption coefficient of light weight concrete is nearly