MCQOPTIONS
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MCQOPTIONS
This section includes 263 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Technology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The cement, widely used in retaining walls, is |
| A. | rapid hardening cement |
| B. | low heat cement |
| C. | sulphate resisting cement |
| D. | ordinary Portland cement |
| Answer» C. sulphate resisting cement | |
| 52. |
The final operation of finishing the concrete surface is called |
| A. | screeding |
| B. | floating |
| C. | trowelling |
| D. | none of these |
| Answer» D. none of these | |
| 53. |
Segregation of concrete increases the strength of concrete. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 54. |
According to the rule of water cement ratio, the strength of concrete wholly depends upon |
| A. | the quality of cement |
| B. | the quality of cement mixed with aggregate |
| C. | the amount of water used in preparation of concrete mix |
| D. | all of the above |
| Answer» D. all of the above | |
| 55. |
The slump test of concrete is used to mesure its |
| A. | consistency |
| B. | mobility |
| C. | homogeneity |
| D. | all of these |
| Answer» B. mobility | |
| 56. |
The concrete without any reinforcement has |
| A. | low |
| B. | high |
| Answer» B. high | |
| 57. |
Rapid hardening cement is used |
| A. | where high early strength is desired |
| B. | where form work is to be removed as early as possible |
| C. | for constructing road pavements |
| D. | all of the above |
| Answer» E. | |
| 58. |
The value of finencess modulus for fine sand may range between |
| A. | 1.1 to 1.3 |
| B. | 1.3 to 1.6 |
| C. | 1.6 to 2.2 |
| D. | 2.2 to 2.6 |
| Answer» E. | |
| 59. |
Cement concrete is |
| A. | permeable |
| B. | impermeable |
| Answer» C. | |
| 60. |
If 30% excess water is added, the strength of concrete is reduced by |
| A. | 30% |
| B. | 40% |
| C. | 50% |
| D. | 60% |
| Answer» D. 60% | |
| 61. |
The minimum quantity of cement to be used in controlled concrete is specified as |
| A. | 120 kg / cm3 |
| B. | 160 kg / cm3 |
| C. | 220 kg / cm3 |
| D. | 280 kg / cm3 |
| Answer» D. 280 kg / cm3 | |
| 62. |
The importance of storing the various ingredients of concrete is |
| A. | to maintain the uniformity of grading |
| B. | to maintain the uniformity of moisture |
| C. | to maintain the strength of materials |
| D. | both (a) and (b) |
| Answer» E. | |
| 63. |
The minimum particle size of coarse aggregate is |
| A. | 2.5 mm |
| B. | 4.75 mm |
| C. | 5.85 mm |
| D. | 6.5 mm |
| Answer» C. 5.85 mm | |
| 64. |
Which of the following statement is correct while compacting concrete with vibrators? |
| A. | The vibrator should be inserted horizontally. |
| B. | The vibrator should not be immersed through a full depth of freshly laid concrete. |
| C. | The vibrator should not touch the form surface. |
| D. | all of the above |
| Answer» D. all of the above | |
| 65. |
A mix with water-cement ratio of 0.78 is termed as wet mix. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 66. |
In concrete walls, construction joints should be provided at the |
| A. | floor level |
| B. | soffit level of lintels |
| C. | sill level of windows |
| D. | all of these |
| Answer» E. | |
| 67. |
The hardening is the phenomenon by virtue of which |
| A. | the cement does not undergo large change in volume when treted with water |
| B. | the plastic cement paste changes into hard mass |
| C. | the cement paste sets and develops strength |
| D. | none of the above |
| Answer» D. none of the above | |
| 68. |
The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from |
| A. | 50 to 60% |
| B. | 60 to 70% |
| C. | 70 to 80% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |
| 69. |
A good concrete should be subjected to |
| A. | maximum |
| B. | minimum |
| Answer» C. | |
| 70. |
Vertical sides of columns may be stripped after |
| A. | 1 to 2 days |
| B. | 7 days |
| C. | 14 days |
| D. | 21 days |
| Answer» B. 7 days | |
| 71. |
According to IS : 383 - 1970, a good a aggregate for concrete construction should be |
| A. | chemically inert |
| B. | sufficiently strong |
| C. | sufficiently hard and durable |
| D. | all of these |
| Answer» E. | |
| 72. |
The ratio of the volume of moist sand to the volume of dry sand is known as |
| A. | crushing value |
| B. | impact value |
| C. | bulking factor |
| D. | none of these |
| Answer» D. none of these | |
| 73. |
Which of following proportion of different ingredient of concrete mix confirm to the arbitrary mothod of mixing? |
| A. | 1 ; 2 ; 5 |
| B. | 1 ; 3 : 7 |
| C. | 1 : 4 ; 8 |
| D. | 1 : 5 ; 9 |
| Answer» D. 1 : 5 ; 9 | |
| 74. |
The standard sand now used in India is obtained from |
| A. | Ennore (Chennai) |
| B. | Mumbai |
| C. | Orissa |
| D. | Jaipur |
| Answer» B. Mumbai | |
| 75. |
The capcity of a ware-house depends upon the |
| A. | floor area occupied by one cement bag |
| B. | height to which the cement bags are piled |
| C. | either (a) or (b) |
| D. | both (a) and (b) |
| Answer» E. | |
| 76. |
For high degree of workability, the compaction factor is |
| A. | 0.65 |
| B. | 0.75 |
| C. | 0.85 |
| D. | 0.95 |
| Answer» E. | |
| 77. |
The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 is |
| A. | 1 ; 1 : 2 |
| B. | 1 ; 1.5 : 3 |
| C. | 1 ; 2 : 4 |
| D. | 1 ; 3 : 6 |
| Answer» C. 1 ; 2 : 4 | |
| 78. |
The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called |
| A. | screeding |
| B. | floating |
| C. | trowelling |
| D. | compacting |
| Answer» B. floating | |
| 79. |
Lime when added in excess quantity |
| A. | makes the cement unsound |
| B. | cuses the cement to expand and disintegrate |
| C. | lowers the clinkering temperature of cement |
| D. | both (a) and (b) |
| Answer» E. | |
| 80. |
The process of hardening the concrete mixes by keeping its surface moist for a certain period is called |
| A. | floating |
| B. | curing |
| C. | screeding |
| D. | none of these |
| Answer» C. screeding | |
| 81. |
The test conducted in the laboratory on the specimen made out of trial concrete mix is called |
| A. | preliminary test |
| B. | slump test |
| C. | works test |
| D. | none of these |
| Answer» B. slump test | |
| 82. |
The measuring 50 litres of aggregate, the inner dimensions of a farma should be |
| A. | 25 cm x 25 cm x 40 cm |
| B. | 29 cm x 29 cm x 48 cm |
| C. | 30 cm x 30 cm x 50 cm |
| D. | 31 cm x 31 cm x 52 cm |
| Answer» E. | |
| 83. |
Under normal circumstances, the beam soffits may be removed after |
| A. | 2 days |
| B. | 7 days |
| C. | 14 days |
| D. | 21 days |
| Answer» C. 14 days | |
| 84. |
In transportation of concrete by pumps |
| A. | the slump should not be less than 50 mm and more than 80 mm |
| B. | the water cement ratio should remain between 0.5 to 0.65 |
| C. | the number of bends in a pipe line should be as small as possible |
| D. | all of the above |
| Answer» E. | |
| 85. |
The workability of concrete is expressed by |
| A. | water-cement ratio |
| B. | slump value |
| C. | compaction factor |
| D. | both (a) and (b) |
| Answer» E. | |
| 86. |
The process of consolidating concrete mix after placing it in position is termed as |
| A. | curing |
| B. | wetting |
| C. | compaction |
| D. | none of these |
| Answer» D. none of these | |
| 87. |
The construction joints in cement concrete |
| A. | should be located where bending moment is large |
| B. | should be located where shear force is large |
| C. | should not be provided at the corners |
| D. | should be spaced at a distance of 3 m apart in case of huge structures |
| Answer» D. should be spaced at a distance of 3 m apart in case of huge structures | |
| 88. |
In order to provide colour, hardness and strength to the cement, the ingredient used is |
| A. | lime |
| B. | silica |
| C. | alumina |
| D. | iron oxide |
| Answer» E. | |
| 89. |
Argillaceous materials contain |
| A. | calcium |
| B. | lime |
| C. | alumina |
| Answer» D. | |
| 90. |
If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1 : 2 : 4, then the grade of concrete is |
| A. | M 10 |
| B. | M 15 |
| C. | M 20 |
| D. | M 25 |
| Answer» C. M 20 | |
| 91. |
Blast furnace slag cement |
| A. | develops low heat of hydration |
| B. | has less early strength |
| C. | develops high heat of hydration |
| D. | has high early strength |
| Answer» F. | |
| 92. |
The process of removing the irregularities from the surface of concrete left after screeding is called floating. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 93. |
The workability of concrete can be improved by adding |
| A. | hydrated lime |
| B. | flyash |
| C. | calcium chloride |
| D. | all of these |
| Answer» E. | |
| 94. |
The rule of water cement ratio was established by |
| A. | Duff Abram |
| B. | Plowman |
| C. | W. Simms |
| D. | Dr. Karl Terzaghi |
| Answer» B. Plowman | |
| 95. |
If the water cement ratio is more, then the |
| A. | strength of concrete will be less |
| B. | durability of concrete will be less |
| C. | capillary voids will be more in the physical structure of hydrated cement |
| D. | all of the above |
| Answer» E. | |
| 96. |
A good concrete should have minimum thermal expansion. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 97. |
Workability of concrete mix having very low water-cement ratio should be obtained by |
| A. | flexural strength test |
| B. | slump test |
| C. | compaction factor test |
| D. | any one of these |
| Answer» D. any one of these | |
| 98. |
In performing the works test |
| A. | the mould for test specimen should be made of non-absorbent material |
| B. | the mould should be constructed in such a way that there is leakage of water from test specimen during moulding |
| C. | the base plate of the mould should be of non-absorbent material |
| D. | all of the above |
| Answer» E. | |
| 99. |
"Colocrete" is the commercial term for |
| A. | high alumina cement |
| B. | coloured cement |
| C. | low heat cement |
| D. | rapid hardening cement |
| Answer» C. low heat cement | |
| 100. |
In preliminary test, the concrete is placed in the mould in |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» C. four | |