McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 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 | |
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