MCQOPTIONS
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MCQOPTIONS
This section includes 185 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Pick up the correct statement from the following i. |
| A. | Higher workability indicates unexpected increase in the moisture content |
| B. | Higher workability indicates deficiency of sand |
| C. | If the concrete mix is dry, the slump is zero |
| D. | Concrete mix having zero slump, is unsuitable for high strength. |
| Answer» E. | |
| 52. |
Batching error means inaccuracy in the quantity of |
| A. | aggregates |
| B. | cement |
| C. | water |
| D. | all the above. |
| Answer» E. | |
| 53. |
The shuttering of a hall measuring 4 m x 5 m, can be removed after |
| A. | 5 days |
| B. | 7 days |
| C. | 10 days |
| D. | 14 days |
| Answer» C. 10 days | |
| 54. |
For concreting tunnel linings, tran-portation of concrete is done by |
| A. | pans |
| B. | wheel borrows |
| C. | containers |
| D. | pumps |
| Answer» E. | |
| 55. |
If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is |
| A. | 2000 bags |
| B. | 2200 bags |
| C. | 2400 bags |
| D. | 2700 bags |
| Answer» E. | |
| 56. |
1.S.I. has specified the full strength of concrete after |
| A. | 7 days |
| B. | 14 days |
| C. | 21 days |
| D. | 28 days |
| Answer» E. | |
| 57. |
Gypsum is added for |
| A. | colour |
| B. | strength |
| C. | controlling setting time |
| D. | none of these. |
| Answer» D. none of these. | |
| 58. |
The strength and quality of concrete, depend upon: |
| A. | grading of aggregates |
| B. | surface area of aggregates |
| C. | shape of aggregates |
| D. | surface texture of aggregates |
| Answer» E. | |
| 59. |
C.R.R.I. charts are used to obtain a relatioship between strength of concrete and |
| A. | water cement ratio |
| B. | workability |
| C. | grading of aggregate |
| D. | fineness modulus |
| Answer» B. workability | |
| 60. |
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» D. both (a) and (b) | |
| 61. |
The maximum percentage of chemical ingredient of cement is that of |
| A. | magnesium oxide |
| B. | iron oxide |
| C. | aluminium |
| D. | lime |
| Answer» E. | |
| 62. |
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» E. | |
| 63. |
Expansion joints are provided if the length of concrete structures exceeds |
| A. | 10 m |
| B. | 15 m |
| C. | 15 m |
| D. | 35 m |
| Answer» E. | |
| 64. |
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» C. covering surface with bags | |
| 65. |
For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is |
| A. | 40 mm |
| B. | 50 mm |
| C. | 60 mm |
| D. | 70 mm |
| Answer» B. 50 mm | |
| 66. |
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» C. 30 times | |
| 67. |
While designing an air entrained concrete |
| A. | water cement ratio is reduced |
| B. | proportion of aggregates is reduced |
| C. | an allowance for the entrained air is made |
| D. | strength of the concrete, is reduced |
| Answer» E. | |
| 68. |
An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than |
| A. | 22.5 mm |
| B. | 18.5 mm |
| C. | 16.5 mm |
| D. | 15.5 mm |
| Answer» E. | |
| 69. |
Higher workability of concrete is required if the structure is |
| A. | made with cement concrete |
| B. | thick and reinfored |
| C. | thin and heavily reinforced |
| D. | thick and heavily reinfored. |
| Answer» E. | |
| 70. |
The operation of removing humps and hollows of uniform concrete surface, is known as |
| A. | floating |
| B. | screeding |
| C. | trowelling |
| D. | finishing |
| Answer» C. trowelling | |
| 71. |
The condition not applicable to water cement ratio law, is |
| A. | internal moisture conditions on hydration continue till complete strength is gained |
| B. | concrete specimens may be tested at any temperature |
| C. | concrete specimens need be of same age |
| D. | concrete specimens need be of same size |
| Answer» C. concrete specimens need be of same age | |
| 72. |
The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than |
| A. | 30 minutes |
| B. | 40 minutes |
| C. | 60 minutes |
| D. | 75 minutes |
| Answer» B. 40 minutes | |
| 73. |
The grade of concrete not recommended by I.S. : 456, is |
| A. | M 100 |
| B. | M 200 |
| C. | M 300 |
| D. | M 400 |
| Answer» E. | |
| 74. |
The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as |
| A. | low-heat Portland cement |
| B. | rapid hardening Portland cement |
| C. | Portland blast slag cement |
| D. | Portland pozzolana cement |
| Answer» B. rapid hardening Portland cement | |
| 75. |
To prevent segregation, the maximum height for placing concrete, is |
| A. | 100 cm |
| B. | 125 cm |
| C. | 150 cm |
| D. | 200 cm |
| Answer» B. 125 cm | |
| 76. |
Particles of 0.002 mm size are that of |
| A. | clay |
| B. | sand |
| C. | gravel |
| D. | none of these. |
| Answer» B. sand | |
| 77. |
Workability of concrete for a given water content is good if the aggregates, are |
| A. | rounded aggregate |
| B. | irregular aggregate |
| C. | angular aggregate |
| D. | flaky aggregates. |
| Answer» B. irregular aggregate | |
| 78. |
Water cement ratio is generally expressed in volume of water required per |
| A. | 10 kg |
| B. | 20 kg |
| C. | 30 kg |
| D. | 40 kg |
| Answer» E. | |
| 79. |
The type of aggregates of same nominal size, which contain less voids when compacted, are |
| A. | rounded spherical |
| B. | irregular |
| C. | flaky |
| D. | none of these. |
| Answer» B. irregular | |
| 80. |
Workability improved by adding |
| A. | fly ash |
| B. | hydrated lime |
| C. | calcium chloride |
| D. | bentonite |
| Answer» E. | |
| 81. |
A concrete having a slump of 6.5 cm, is said to be |
| A. | dry |
| B. | earth moist |
| C. | semi-plastic |
| D. | plastic |
| Answer» E. | |
| 82. |
Too wet concrete may cause |
| A. | weakness of concrete |
| B. | excessive laitance |
| C. | segregation |
| D. | lower density |
| Answer» E. | |
| 83. |
If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is |
| A. | 8 kg |
| B. | 10 kg |
| C. | 12 kg |
| D. | 14 kg |
| Answer» D. 14 kg | |
| 84. |
Sand requiring a high water cement ratio, belongs to |
| A. | Zone I |
| B. | Zone II |
| C. | Zone III |
| D. | Zone IV. |
| Answer» B. Zone II | |
| 85. |
Workability of concrete mix with low water cement ratio is determined by |
| A. | tensile strength test |
| B. | slump test |
| C. | compaction factor test |
| D. | flexural strength test |
| Answer» D. flexural strength test | |
| 86. |
If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is |
| A. | 0.1 |
| B. | 0.12 |
| C. | 0.15 |
| D. | 0.2 |
| Answer» E. | |
| 87. |
The specifications of a cement bag for storage, are |
| A. | weight 50 kg |
| B. | height 18 cm |
| C. | plan area 3000 sq. cm |
| D. | volume 35 litres |
| Answer» E. | |
| 88. |
Strength of concrete with passage of time |
| A. | increases |
| B. | decreases |
| C. | fluctuates |
| D. | remains constant. |
| Answer» B. decreases | |
| 89. |
Addition of pozzolana to cement |
| A. | decreases workability |
| B. | increases strength |
| C. | increases heat of hydration |
| D. | decreases curing time |
| Answer» E. | |
| 90. |
If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is |
| A. | 15, 900 litres |
| B. | 16, 900 litres |
| C. | 17, 900 litres |
| D. | 18, 900 litres |
| Answer» E. | |
| 91. |
An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than |
| A. | 0.05 |
| B. | 0.1 |
| C. | 0.15 |
| D. | 0.2 |
| Answer» C. 0.15 | |
| 92. |
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» B. 10 cm, 30 cm, 20 cm | |
| 93. |
Placing of concrete should preferably be done at a temperature of |
| A. | 0°C |
| B. | 10°C |
| C. | 20°C |
| D. | 23°C |
| Answer» E. | |
| 94. |
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» E. | |
| 95. |
The void ratio of |
| A. | single size coarse aggregate is roughly 0.45. |
| B. | graded coarse aggregate is roughly 0.040 |
| C. | fine aggregate is roughly 0.45 |
| D. | all the above. |
| Answer» E. | |
| 96. |
You are asked to construct a massive dam, the type of cement you will use, is |
| A. | ordinary Portland cement |
| B. | rapid hardening cement |
| C. | low heat cement |
| D. | blast furnace slag cement |
| Answer» D. blast furnace slag cement | |
| 97. |
Horizontal construction joints in concrete walls are generally provided at |
| A. | soffit level |
| B. | window sill level |
| C. | floor level |
| D. | all the above. |
| Answer» E. | |
| 98. |
The main object of compaction of concrete, is: |
| A. | to eliminate air holes |
| B. | to achieve maximum density |
| C. | to provide initimate contact between the concrete and embedded materials |
| D. | all the above. |
| Answer» E. | |
| 99. |
If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is |
| A. | 0.1 |
| B. | 0.125 |
| C. | 0.15 |
| D. | 0.185 |
| Answer» C. 0.15 | |
| 100. |
The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is |
| A. | 0.3 |
| B. | 0.4 |
| C. | 0.5 |
| D. | 60%. |
| Answer» D. 60%. | |