McqMate
1. |
Processes of cement manufacturing is…….? |
A. | Wet process |
B. | Dry process |
C. | Semi-dry process |
D. | All of above |
Answer» D. All of above |
2. |
After 28 days of curing, cement gains have been found to have hydrated to a depth of only…..u. |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 6 |
Answer» C. 4 |
3. |
Total…….. % of water by weight of water by weight of cement is required for complete hydration. |
A. | 40 |
B. | 38 |
C. | 42 |
D. | 50 |
Answer» B. 38 |
4. |
Hydration of cement is due to chemical action of water with |
A. | Tricalcium silicate and dicalcium silicate |
B. | Dicalcium silicate and tricalcium aluminate |
C. | Tricalcium aluminate and tricalcium alumino ferrite |
D. | All the above. |
Answer» D. All the above. |
5. |
Proper proportioning of concrete, ensures |
A. | desired strength and workability |
B. | desired durability |
C. | water tightness of the structure |
D. | all the above |
Answer» D. all the above |
6. |
An aggregate is said to be flaky if its least dimension is less than |
A. | 1/5th of mean dimension |
B. | 2/5th of mean dimension |
C. | 3/5th of mean dimension |
D. | 4/5th of mean dimension |
Answer» C. 3/5th of mean dimension |
7. |
A small quantity of …………. % of gypsum is added to prevent flash-setting of the cement. |
A. | 1 to 2 |
B. | 2 to 3 |
C. | 9 to 10 |
D. | 10 to 12 |
Answer» B. 2 to 3 |
8. |
Highest oxide composition present in cement is…… |
A. | Silica |
B. | Alumina |
C. | Iron oxides |
D. | Lime |
Answer» D. Lime |
9. |
First 7 days strength in cement is due to….. Bogue compound. |
A. | C3S |
B. | C2S |
C. | C3A |
D. | C4AF |
Answer» A. C3S |
10. |
Heat of hydration of C3S at 90 days is ………. cal/g |
A. | 58 |
B. | 104 |
C. | 122 |
D. | 150 |
Answer» B. 104 |
11. |
…………refers to the gain of strength of a set cement paste. |
A. | Setting of cement |
B. | Hardening of cement |
C. | none |
D. | all |
Answer» B. Hardening of cement |
12. |
For long time storage ……..cement used. |
A. | Masonry cement |
B. | Ordinary |
C. | Hydrophobic |
D. | All of above |
Answer» C. Hydrophobic |
13. |
Repair of air-field pavement use…… |
A. | Air entrained cement |
B. | Very high Strength cement |
C. | Rediset Cement |
D. | All of above |
Answer» B. Very high Strength cement |
14. |
Note more than ……. bags should be kept one above other. |
A. | 20 |
B. | 25 |
C. | 14 |
D. | Any of above |
Answer» C. 14 |
15. |
For Fineness test ……. micron sieve is use. |
A. | 100 |
B. | 80 |
C. | 60 |
D. | 90 |
Answer» D. 90 |
16. |
The weight of residue should not exceed ……. for OPC. |
A. | 10 % |
B. | 20 % |
C. | 30% |
D. | 40% |
Answer» A. 10 % |
17. |
For consistency test vicat plunger having ……. dia and …….. Length is used. |
A. | 15 mm & 45 mm |
B. | 10 mm & 50 mm |
C. | 20 mm & 60mm |
D. | Any of above |
Answer» B. 10 mm & 50 mm |
18. |
For OPC Value of IST And FST is…… . |
A. | 30 m & 600 m |
B. | 50 m & 700 m |
C. | 20m & 500 m |
D. | 40m & 800 m |
Answer» A. 30 m & 600 m |
19. |
For compressive strength test of cement ………. water is added. |
A. | p/3 + 3 |
B. | p/2 + 3 |
C. | p/4 + 3 |
D. | p/5 +3 |
Answer» C. p/4 + 3 |
20. |
Undesirable expansion of some of constituents of cement after setting is known as……… . |
A. | Soundness |
B. | unsoundness |
C. | none |
D. | all |
Answer» B. unsoundness |
21. |
Density of light weight aggregate concrete is about …….. kg/m3 . |
A. | 3000 |
B. | 1500 |
C. | 1200 |
D. | 1400 |
Answer» C. 1200 |
22. |
Material between…………… is classified as silt. |
A. | 002 mm to 0.003 mm |
B. | 0.08 mm to 1 mm |
C. | 8 mm to 10 mm |
D. | 0.06 mm to 0.002 mm |
Answer» D. 0.06 mm to 0.002 mm |
23. |
Angular aggregate having percentage of voids ranging from………. |
A. | 32 to 33 |
B. | 35 to 38 |
C. | 38 to 40 |
D. | 40 to 45 |
Answer» C. 38 to 40 |
24. |
In crushing value test of aggregate, gradually compressive load of….. Tons is apply. |
A. | 40 |
B. | 50 |
C. | 44 |
D. | 45 |
Answer» A. 40 |
25. |
Specific gravity of natural aggregate lie between…… |
A. | 2.5 to 2.6 |
B. | 2.6 to 2.7 |
C. | 2.6 to 2.8 |
D. | 2.8 to 2.9 |
Answer» C. 2.6 to 2.8 |
26. |
Coarse aggregates absorbs…….. % of moisture. |
A. | 1 to 2 |
B. | 0.5 to 1 |
C. | 2 to 4 |
D. | 2 to 3 |
Answer» B. 0.5 to 1 |
27. |
To control alkali aggregate reaction restricting alkali content in cement below……% |
A. | 1 |
B. | 0.1 |
C. | 0.5 |
D. | 0.6 |
Answer» D. 0.6 |
28. |
If the actual grading curve is steeper than the specified grading curve, it indicates an excess of ……..particle size. |
A. | sand |
B. | coarser |
C. | medium |
D. | cement |
Answer» C. medium |
29. |
Fineness modulus of fine sand is…… . |
A. | 2.2 – 2.6 |
B. | 2.6 – 2.9 |
C. | 2.9 – 3.2 |
D. | 3.2 - 4.2 |
Answer» A. 2.2 – 2.6 |
30. |
Permissible limit organic solids in water is……..mg/l |
A. | 400 |
B. | 600 |
C. | 200 |
D. | 500 |
Answer» C. 200 |
31. |
Bigger size of aggregate will give higher workability. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
32. |
To measure workability of concrete in field …………….test is used. |
A. | Flow test |
B. | Compacting factor test |
C. | Slump test |
D. | All of above |
Answer» C. Slump test |
33. |
Steel tamping rod of 0.6m length and 16 mm diameter is used for tamping of concrete. |
A. | False |
B. | True |
C. | none |
D. | all |
Answer» B. True |
34. |
Types of slump is….. |
A. | True slump |
B. | Shear slump |
C. | Collapse slump |
D. | All of above |
Answer» D. All of above |
35. |
25 to 75 mm workability of concrete, indicate |
A. | High workability |
B. | Medium workability |
C. | Low workability |
D. | Any of this |
Answer» C. Low workability |
36. |
In very low category of degree of workability determination by compacting factor will be more appropriate. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
37. |
Compacting factor test should be made for concrete with maximum size of aggregate not exceeding 40 mm. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
38. |
The value of flow % may range anything from 0 to …. % |
A. | 200 |
B. | 250 |
C. | 210 |
D. | 150 |
Answer» D. 150 |
39. |
Separating out of the ingredients of concrete mix from concrete is known as……… . |
A. | Segregation |
B. | bleeding |
C. | separation |
D. | Any of these |
Answer» A. Segregation |
40. |
Water from concrete comes out to the surface of the concrete is known as………. |
A. | Segregation |
B. | bleeding |
C. | separation |
D. | Any of these |
Answer» B. bleeding |
41. |
Main causes of bleeding : |
A. | Highly wet mix |
B. | Badly proportion mix |
C. | Insufficiently mixed concrete |
D. | All of this |
Answer» D. All of this |
42. |
The formation of cement paste at the surface is known as laitance. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
43. |
Workability of concrete is……. to the w/c. |
A. | proportional |
B. | inversely proportional |
C. | none |
D. | all |
Answer» A. proportional |
44. |
Workability of concrete is …….to the strength of concrete. |
A. | proportional |
B. | inversely proportional |
C. | none |
D. | all |
Answer» B. inversely proportional |
45. |
Good method for proportioning the materials. |
A. | Weight batching |
B. | Volume batching |
C. | none |
D. | all |
Answer» A. Weight batching |
46. |
In Volume batching 1 bag cement = |
A. | 35 lit |
B. | 40 lit |
C. | 45 lit |
D. | 50 lit |
Answer» A. 35 lit |
47. |
In volume batching………. % of bulking is take into account. |
A. | 30 |
B. | 40 |
C. | 20 |
D. | 10 |
Answer» C. 20 |
48. |
Density of water is 1 kg/liter. |
A. | True |
B. | false |
C. | none |
D. | all |
Answer» A. True |
49. |
In hand mixing …….. % more cement is added in mix. |
A. | 30 |
B. | 40 |
C. | 20 |
D. | 10 |
Answer» D. 10 |
50. |
Concrete mixer are generally designed to run at a speed of ……….. Revolution per minute. |
A. | 40 to 50 |
B. | 30 to 40 |
C. | 15 to 20 |
D. | 20 to 30 |
Answer» C. 15 to 20 |
51. |
For proper mixing about…………. revolution are required. |
A. | 40 to 50 |
B. | 30 to 40 |
C. | 15 to 20 |
D. | 25 to 30 |
Answer» D. 25 to 30 |
52. |
The process of mixing, transporting, placing and compacting concrete should not take more than ……. min any case. |
A. | 90 |
B. | 80 |
C. | 70 |
D. | 60 |
Answer» A. 90 |
53. |
Commonly use retarders is…… |
A. | Calcium sulphate |
B. | Sugars |
C. | Cellulose products. |
D. | All of the above |
Answer» D. All of the above |
54. |
Inert material of a cement concrete mix, is |
A. | water |
B. | cement |
C. | aggregate |
D. | none of these |
Answer» C. aggregate |
55. |
Placing of concrete should preferably be done at a temperature of |
A. | 0°C |
B. | 10°C |
C. | 20°C |
D. | 27 ± 2°C |
Answer» D. 27 ± 2°C |
56. |
The aggregate impact value of the aggregate used in |
A. | building concrete is less than 45 |
B. | road pavement concrete is less than 30 |
C. | runway concrete is less than 30 |
D. | all the above. |
Answer» D. all the above. |
57. |
On a grading curve, the gap grading is represented by |
A. | a horizontal line |
B. | a vertical line |
C. | N.W. inclined line |
D. | N.E. inclined line |
Answer» A. a horizontal line |
58. |
Bulking of sand is |
A. | mixing of different sizes of sand particles |
B. | mixing of lime with sand |
C. | maximum water with sand |
D. | swelling of sand when wetted |
Answer» D. swelling of sand when wetted |
59. |
Curing of pavements, floors, roofs and slabs, is done by |
A. | membrane method |
B. | ponding method |
C. | covering surface with bags |
D. | sprinkling water method |
Answer» B. ponding method |
60. |
Pick up the incorrect statement from the following: |
A. | With passage of time, the strength of cement increases |
B. | With passage of time, the strength of cement decreases |
C. | After a period of 24 months, the strength of cement reduces to 50% |
D. | The concrete made with storage deteriorated cement, gains strength with time |
Answer» A. With passage of time, the strength of cement increases |
61. |
The surface where two successive placements of concrete meet, is known as |
A. | Contraction joint |
B. | Expansion joint |
C. | Construction joint |
D. | both (a) and (b) |
Answer» C. Construction joint |
62. |
An excess of flaky particles in concrete aggregates |
A. | decreases the workability |
B. | increases the quantity of water and sand |
C. | affects the durability of concrete |
D. | all the above |
Answer» D. all the above |
63. |
I.S.I. has specified the full strength of concrete after |
A. | 7 days |
B. | 14 days |
C. | 21 days |
D. | 28 days |
Answer» D. 28 days |
64. |
The minimum percentage of chemical ingredient of cement is that of |
A. | magnesium oxide |
B. | iron oxide |
C. | alumina |
D. | lime |
Answer» A. magnesium oxide |
65. |
The specifications of a cement bag for storage, are |
A. | weight 50 kg |
B. | height 18 cm |
C. | plan area 3000 sq. cm |
D. | all the above |
Answer» D. all the above |
66. |
The bulk density of aggregates, depends upon |
A. | shape |
B. | grading |
C. | compaction |
D. | all the above. |
Answer» D. all the above. |
67. |
The concrete mix which causes difficulty in obtaining a smooth finish, possess |
A. | segregation |
B. | internal friction |
C. | harshness |
D. | bleeding |
Answer» C. harshness |
68. |
An aggregate is known as cyclopean aggregate if its size is more than |
A. | 4.75 mm |
B. | 30 mm |
C. | 60 mm |
D. | 75 mm |
Answer» D. 75 mm |
69. |
The main object of compaction of concrete, is: |
A. | to eliminate air holes |
B. | to achieve maximum density |
C. | to provide intimate contact between the concrete and embedded materials |
D. | all the above |
Answer» D. all the above |
70. |
Concrete gains strength due to |
A. | chemical reaction of cement with sand and coarse aggregates |
B. | evaporation of water from concrete |
C. | hydration of cement |
D. | All the above |
Answer» 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 |
A. | 20.5 mm |
B. | 30.5 mm |
C. | 40.5 mm |
D. | 50.5 mm |
Answer» C. 40.5 mm |
72. |
Log Angles machine is used to test the aggregate for |
A. | crushing strength |
B. | impact value |
C. | abrasion resistance |
D. | water absorption |
Answer» C. abrasion resistance |
73. |
Pozzolanic properties exist in |
A. | shales |
B. | fly ash |
C. | pumicite |
D. | all the above |
Answer» D. all the above |
74. |
Workability improved by adding |
A. | fly ash |
B. | hydrated lime |
C. | calcium chloride |
D. | all the above |
Answer» 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 |
A. | M 10 |
B. | M 15 |
C. | M 20 |
D. | M 30 |
Answer» A. M 10 |
76. |
Gypsum is added for |
A. | colour |
B. | strength |
C. | controlling setting time |
D. | none of these |
Answer» C. controlling setting time |
77. |
Cement used for normal concrete construction, is obtained by burning a mixture of |
A. | silicious and argillaceous materials |
B. | argilaceous and calcareous materials |
C. | silicious and catcareous materials |
D. | silicious, argillaceous and calcareous materials |
Answer» 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 |
A. | 20 times |
B. | 25 times |
C. | 30 times |
D. | 40 times |
Answer» B. 25 times |
79. |
Efflorescence in cement is caused due to an excess of |
A. | alumina |
B. | iron oxide |
C. | silica |
D. | alkalis |
Answer» D. alkalis |
80. |
Slump test of concrete is a measure of its |
A. | consistency |
B. | compressive strength |
C. | tensile strength |
D. | impact value. |
Answer» A. consistency |
81. |
Pick up the incorrect statement applicable to the field test of good cement. |
A. | When one thrusts one's hand into a bag of cement, one should feel warm |
B. | The colour of the cement is bluish |
C. | A handful of cement thrown into a bucket of water should sink immediately |
D. | All the above |
Answer» D. All the above |
82. |
The most useless aggregate is one whose surface texture is |
A. | smooth |
B. | granular |
C. | glassy |
D. | honey combed and porous |
Answer» C. glassy |
83. |
The top diameter, bottom diameter and the height of a slump mould are : |
A. | 10 cm, 20 cm, 30 cm |
B. | 10 cm, 30 cm, 20 cm |
C. | 20 cm, 10 cm, 30 cm |
D. | 20 cm, 30 cm, 10 cm |
Answer» A. 10 cm, 20 cm, 30 cm |
84. |
For concreting tunnel linings, transportation of concrete is done by |
A. | pans |
B. | wheel borrows |
C. | containers |
D. | pumps |
Answer» D. pumps |
85. |
Admixture which cause early setting and hardening of concrete are called … |
A. | Workability admixtures |
B. | accelerators |
C. | retarders |
D. | air entraining agents |
Answer» B. accelerators |
86. |
As compared to ordinary Portland cement, high alumina cement has |
A. | higher initial setting time but lower final setting time |
B. | lower initial setting time but higher final setting time |
C. | none |
D. | all |
Answer» A. higher initial setting time but lower final setting time |
87. |
Maximum permissible limit of magnesia content in OPC is… |
A. | 4 % |
B. | 6% |
C. | 8% |
D. | 10% |
Answer» B. 6% |
88. |
Reduction in the quantity of mixing water which is possible by the use of plasticizers and admixture varies from |
A. | 1% to 5% |
B. | 5% to 15% |
C. | 15% to 25% |
D. | 25% to 35% |
Answer» B. 5% to 15% |
89. |
Which of the following types of concrete mixture is most commonly used in precast concrete factories? |
A. | truck mounted mixture |
B. | pan type mixer |
C. | dual drum mixture |
D. | tilting drum mixture |
Answer» B. pan type mixer |
90. |
According to IS : 456-1978 minimum period stipulated for most curing of concrete using ordinary Portland cement is |
A. | 3 days |
B. | 7 days |
C. | 14 days |
D. | 28 days |
Answer» B. 7 days |
91. |
For reinforced concrete exposed to sulphate attack minimum grade required is |
A. | M10 |
B. | M15 |
C. | M20 |
D. | M25 |
Answer» C. M20 |
92. |
The deterioration of concrete take place due to. |
A. | Salt solution |
B. | Alkalies |
C. | Fertilizers |
D. | All of the above |
Answer» D. All of the above |
93. |
Cement content should be such that concrete has sufficient alkalinity (PH value). |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
94. |
For sea water concreting …………. cement shall be used. |
A. | Portland slag cement |
B. | Portland pozzolana slag cement |
C. | Super sulphated cement |
D. | All of above |
Answer» D. All of above |
95. |
Durability of concrete can be improved by impregnation of …………… in the voids of concrete. |
A. | polymer |
B. | cement |
C. | Lime |
D. | Soda |
Answer» A. polymer |
96. |
What do you mean by admixtures? |
A. | Ingredients which are added to in cement before or after concrete mix |
B. | Ingredients which are added to make aggregates healthier |
C. | Ingredients added in cement to make it shinier |
D. | Ingredients added in concrete to make good workability |
Answer» A. Ingredients which are added to in cement before or after concrete mix |
97. |
Super plasticizers reduce water requirement by ___________ %. |
A. | 12-30 |
B. | 10-15 |
C. | 30-42 |
D. | 48 |
Answer» A. 12-30 |
98. |
Damp proofing is done with a __________ based mixture. |
A. | Sand |
B. | Tar |
C. | Rubber |
D. | Lead |
Answer» B. Tar |
99. |
What is water proofing admixtures? |
A. | Water repellent materials |
B. | Water fair material |
C. | Water absorption material |
D. | Water adsorption material |
Answer» A. Water repellent materials |
100. |
Which one is not a chemically active pore filling material? |
A. | Silicate of soda |
B. | Aluminium |
C. | Chalk |
D. | Zinc |
Answer» B. Aluminium |
Done Reading?