McqMate
| 1. |
The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is |
| A. | not needed |
| B. | provided equally on inner and front faces |
| C. | provided more on inner face than on front face |
| D. | provided more on front face than on inner face |
| Answer» D. provided more on front face than on inner face | |
| 2. |
Bulking of sand is maximum if moisture content is about |
| A. | 2 % |
| B. | 4 % |
| C. | 6 % |
| D. | 10 % |
| Answer» B. 4 % | |
| 3. |
Diagonal tension in a beam |
| A. | is maximum at neutral axis |
| B. | decreases below the neutral axis and increases above the neutral axis |
| C. | increases below the neutral axis and decreases above the neutral axis |
| D. | remains same |
| Answer» C. increases below the neutral axis and decreases above the neutral axis | |
| 4. |
According to IS: 4561978, the column or the strut is the member whose effective length is greater than |
| A. | the least lateral dimension |
| B. | 2 times the least lateral dimension |
| C. | 3 times the least lateral dimension |
| D. | 4 times the least lateral dimension |
| Answer» C. 3 times the least lateral dimension | |
| 5. |
When shear stress exceeds the permissible limit in a slab, then it is reduced by |
| A. | increasing the depth |
| B. | providing shear reinforcement |
| C. | using high strength steel |
| D. | using thinner bars but more in number |
| Answer» A. increasing the depth | |
| 6. |
The diameter of ties in a column should be |
| A. | more than or equal to one fourth of diameter of main bar |
| B. | more than or equal to 5 mm |
| C. | more than 5 mm but less than one-fourth of diameter of main bar |
| D. | more than 5 mm and also more than one-fourth of diameter of main bar |
| Answer» D. more than 5 mm and also more than one-fourth of diameter of main bar | |
| 7. |
In counterfort retaining walls, the main reinforcement in the stem at support is |
| A. | not provided |
| B. | provided only on inner face |
| C. | provided only on front face |
| D. | provided both on inner and front faces |
| Answer» B. provided only on inner face | |
| 8. |
Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to |
| A. | deflect downward |
| B. | deflect upward |
| C. | deflect downward or upward |
| D. | none of the above |
| Answer» A. deflect downward | |
| 9. |
The purpose of reinforcement in pre-stressed concrete is |
| A. | to provide adequate bond stress |
| B. | to resist tensile stresses |
| C. | to impart initial compressive stress in concrete |
| D. | all of the above |
| Answer» C. to impart initial compressive stress in concrete | |
| 10. |
Select the correct statement |
| A. | elastic modulus of high tensile steel is nearly the same as that of mild steel |
| B. | elastic modulus of high tensile steel is more than that of mild steel |
| C. | carbon percentage in high carbon steel is less than that in mild steel |
| D. | high tensile steel is cheaper than mild steel |
| Answer» A. elastic modulus of high tensile steel is nearly the same as that of mild steel | |
| 11. |
Due to circumferential action of the spiral in a spirally reinforced column |
| A. | capacity of column is decreased |
| B. | ductility of column reduces |
| C. | capacity of column is decreased but ductility of column increases |
| D. | both the capacity of column and ductility of column increase |
| Answer» D. both the capacity of column and ductility of column increase | |
| 12. |
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be |
| A. | 0.75 - 0.80 |
| B. | 0.80 - 0.85 |
| C. | 0.85 - 0.92 |
| D. | above 0.92 |
| Answer» D. above 0.92 | |
| 13. |
Workability of concrete is directly proportional to |
| A. | aggregate cement ratio |
| B. | time of transit |
| C. | grading of the aggregate |
| D. | all of above |
| Answer» C. grading of the aggregate | |
| 14. |
Critical section for shear in case of flat slabs is at a distance of |
| A. | effective depth of slab from periphery of column/drop panel |
| B. | d/2 from periphery of column/capital/ drop panel |
| C. | at the drop panel of slab |
| D. | at the periphery of column |
| Answer» B. d/2 from periphery of column/capital/ drop panel | |
| 15. |
For road pavements, the cement generally used, is |
| A. | ordinary portland cement |
| B. | rapid hardening cement |
| C. | low heat cement |
| D. | blast furnace slag cement |
| Answer» B. rapid hardening cement | |
| 16. |
Pick up the incorrect statement from the following: |
| A. | space between the exterior walls of a warehouse and bag piles should be 30 cm |
| B. | cement bags should preferably be piled on wooden planks |
| C. | width and height of the pile should not exceed 3 m and 2.70 m respectively |
| D. | none of these |
| Answer» D. none of these | |
| 17. |
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory |
| A. | is always less than 1 |
| B. | is always greater than 1 |
| C. | can be more than 1 |
| D. | can be less than 1 |
| Answer» A. is always less than 1 | |
| 18. |
Addition of pozzolana to ordinary port land cement, causes |
| A. | decrease in early strength |
| B. | reduction in chemical action with sulphates |
| C. | increase in shrinkage |
| D. | all the above |
| Answer» D. all the above | |
| 19. |
Pick up the correct statement from the following: |
| A. | the maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm |
| B. | the maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm |
| C. | the material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt |
| D. | all the above |
| Answer» D. all the above | |
| 20. |
For construction of structures in sea water, the cement generally preferred to, is |
| A. | portland-pozzolana cement |
| B. | quick setting cement |
| C. | low heat portland cement |
| D. | rapid hardening cement |
| Answer» A. portland-pozzolana cement | |
| 21. |
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 | |
| 22. |
Pick up the correct statement from the following: |
| A. | construction joints are necessarily planned for their locations |
| B. | expansion joints are provided to accommodate thermal expansion |
| C. | construction joints are provided to control shrinkage cracks |
| D. | all the above |
| Answer» D. all the above | |
| 23. |
The bulk density of aggregates, depends upon |
| A. | shape |
| B. | grading |
| C. | compaction |
| D. | all the above |
| Answer» D. all the above | |
| 24. |
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively |
| A. | compressive and tensile |
| B. | tensile and compressive |
| C. | both compressive |
| D. | both tensile |
| Answer» B. tensile and compressive | |
| 25. |
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 | |
| 26. |
Which of the following has high tensile strength? |
| A. | plain hot rolled wires |
| B. | cold drawn wires |
| C. | heat treated rolled wires |
| D. | all have same tensile strength |
| Answer» B. cold drawn wires | |
| 27. |
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 | |
| 28. |
To determine the modulus of rupture, the size of test specimen used is |
| A. | 150 × 150 × 500 mm |
| B. | 100 × 100 × 700 mm |
| C. | 150 × 150 × 700 mm |
| D. | 100 × 100 × 500 mm |
| Answer» C. 150 × 150 × 700 mm | |
| 29. |
Tricalcium aluminate (C3A) |
| A. | reacts fast with water |
| B. | generates less heat of hydration |
| C. | causes initial setting and early strength of cement |
| D. | does not contribute to develop ultimate strength |
| Answer» B. generates less heat of hydration | |
| 30. |
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 100 |
| B. | m 150 |
| C. | m 200 |
| D. | m 250 |
| Answer» A. m 100 | |
| 31. |
Admixtures which cause early setting and hardening of concrete are called |
| A. | workability admixtures |
| B. | accelerators |
| C. | retarders |
| D. | air entraining agents |
| Answer» B. accelerators | |
| 32. |
Pick up the correct statement from the following: |
| A. | sand stones may be divided into calcareous, siliceous and ferruginous sand stones |
| B. | concrete using sand stones, cracks due to excessive shrinkage |
| C. | broken bricks produce a concrete having good fire resisting qualities |
| D. | all the above |
| Answer» D. all the above | |
| 33. |
Pick up the incorrect statement from the following: |
| A. | admixtures accelerate hydration |
| B. | admixtures make concrete water proof |
| C. | admixtures make concrete acid proof |
| D. | admixtures give high strength |
| Answer» A. admixtures accelerate hydration | |
| 34. |
For a reinforced concrete section, the shape of shear stress diagram is |
| A. | wholly parabolic |
| B. | wholly rectangular |
| C. | parabolic above neutral axis and rectangular below neutral axis |
| D. | rectangular above neutral axis and parabolic below neutral axis |
| Answer» C. parabolic above neutral axis and rectangular below neutral axis | |
| 35. |
Allowable shear strength of concrete, depends upon |
| A. | shear strength |
| B. | tensile strength |
| C. | compressive strength |
| D. | none of these |
| Answer» A. shear strength | |
| 36. |
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. | 50 times |
| Answer» B. 25 times | |
| 37. |
The individual variation between test strength of sample should not be more than |
| A. | ±5 % of average |
| B. | ± 10 % of average |
| C. | ± 15 % of average |
| D. | ±20 % of average |
| Answer» C. ± 15 % of average | |
| 38. |
Pick up the incorrect statement from the following: |
| A. | concrete for which preliminary tests are conducted, is called controlled concrete |
| B. | bulking of sand depends upon the fineness of grains |
| C. | concrete mix 1 : 6 : 12, is used for mass concrete in piers |
| D. | all the above |
| Answer» D. all the above | |
| 39. |
The slab is designed as one way if the ratio of long span to short span is |
| A. | less than 1 |
| B. | between 1 and 1.5 |
| C. | between 1.5 and 2 |
| D. | greater than 2 |
| Answer» D. greater than 2 | |
| 40. |
For the construction of cement concrete dams, the maximum permissible size of the aggregates, is |
| A. | 40 mm |
| B. | 50 mm |
| C. | 60 mm |
| D. | 70 mm |
| Answer» A. 40 mm | |
| 41. |
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 | |
| 42. |
To hydrate 500kg of cement full water needed, is |
| A. | 100 kg |
| B. | 110 kg |
| C. | 120 kg |
| D. | 130 kg |
| Answer» D. 130 kg | |
| 43. |
Pick up the correct statement from the following: |
| A. | a highly absorptive aggregate reduces the workability of concrete considerably |
| B. | the specific gravity of aggregate is important for the determination of the moisture content |
| C. | the absorption and porosity of an aggregate influence the property of the concrete |
| D. | all the above |
| Answer» D. all the above | |
| 44. |
In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on |
| A. | front face only |
| B. | inner face only |
| C. | both front face and inner face |
| D. | none of the above |
| Answer» A. front face only | |
| 45. |
Under normal conditions using an ordinary cement, the period of removal of the form work, is: |
| A. | 7 days for beam soffits |
| B. | 14 days for bottom slabs of spans 4.6 m and more |
| C. | 21 days for bottom beams over 6 m spans |
| D. | all the above |
| Answer» D. all the above | |
| 46. |
Water cement ratio is generally expressed in volume of water required per |
| A. | 10 kg |
| B. | 20 kg |
| C. | 30 kg |
| D. | 50 kg |
| Answer» D. 50 kg | |
| 47. |
To ensure constant moisture content in aggregates |
| A. | area of each aggregate pile should be large |
| B. | height of each aggregate pile should not exceed 1.50 m |
| C. | aggregate pile should be left for 24 hours before aggregates are used |
| D. | all the above |
| Answer» D. all the above | |
| 48. |
Pick up the correct statement from the following: |
| A. | cement should be mixed for at least one minute |
| B. | 10% of water is placed in the rotating drum before adding dry material |
| C. | 10% of water is added after placing the other ingredients in the drum |
| D. | all the above |
| Answer» D. all the above | |
| 49. |
The average permissible stress in bond for plain bars in tension is |
| A. | increased by 10% for bars in compression |
| B. | increased by 25% for bars in compression |
| C. | decreased by 10% for bars in compression |
| D. | decreased by 25% for bars in compression |
| Answer» B. increased by 25% for bars in compression | |
| 50. |
Concrete mainly consists of |
| A. | cement |
| B. | aggregates |
| C. | water |
| D. | all the above |
| Answer» D. all the above | |
| 51. |
For the construction of thin R.C.C. structures, the type of cement to be avoided, is |
| A. | ordinary portland cement |
| B. | rapid hardening cement |
| C. | low heat cement |
| D. | blast furnace slag cement |
| Answer» D. blast furnace slag cement | |
| 52. |
Which of the following R.C. retaining walls is suitable for heights beyond 6 m? |
| A. | l-shaped wall |
| B. | t-shaped wall |
| C. | counterfort type |
| D. | all of the above |
| Answer» C. counterfort type | |
| 53. |
For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are: |
| A. | 70 litres of sand and 120 litres of aggregates |
| B. | 70 kg of sand and 140 litres of aggregates |
| C. | 105 litres of sand and 140 litres of aggregates |
| D. | 105 litres of sand and 210 litres of aggregates |
| Answer» D. 105 litres of sand and 210 litres of aggregates | |
| 54. |
A concrete using an air entrained cement |
| A. | has strength less than 10% to 15% |
| B. | has more resistance to weathering |
| C. | is more plastic and workable |
| D. | is free from segregation and bleeding |
| Answer» C. is more plastic and workable | |
| 55. |
Pick up the correct statement from the following: |
| A. | segregation is necessary for a workable concrete |
| B. | consistency does not affect the workability of concrete |
| C. | if the concrete mix is dry, the slump is maximum |
| D. | none of these |
| Answer» D. none of these | |
| 56. |
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 | |
| 57. |
A beam curved in plan is designed for |
| A. | bending moment and shear |
| B. | bending moment and torsion |
| C. | shear and torsion |
| D. | bending moment, shear and torsion |
| Answer» D. bending moment, shear and torsion | |
| 58. |
Pick up the correct statement from the following: |
| A. | water cement paste hardens due to hydration |
| B. | during hardening cement binds the aggregates together |
| C. | cement provides strength, durability and water tightness to the concrete |
| D. | all the above |
| Answer» D. all the above | |
| 59. |
'Ware house pack' of cement means |
| A. | full capacity of the ware house |
| B. | pressure exertion of the bags of upper layers |
| C. | pressure compaction of the bags on lower layers |
| D. | packing the ware house |
| Answer» C. pressure compaction of the bags on lower layers | |
| 60. |
High carbon content in the steel causes |
| A. | decrease in tensile strength but increase in ductility |
| B. | increase in tensile strength but decrease in ductility |
| C. | decrease in both tensile strength and ductility |
| D. | increase in both tensile strength and ductility |
| Answer» B. increase in tensile strength but decrease in ductility | |
| 61. |
Particles of 0.002 mm size are that of |
| A. | clay |
| B. | sand |
| C. | gravel |
| D. | none of these |
| Answer» A. clay | |
| 62. |
Ultimate strength of cold drawn high steel wires |
| A. | increases with increase in diameter of bar |
| B. | decreases with increase in diameter of bar |
| C. | does not depend on diameter of bar |
| D. | none of the above |
| Answer» B. decreases with increase in diameter of bar | |
| 63. |
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» A. low-heat portland cement | |
| 64. |
The dimensions of a 35 litre forma for measuring aggregates by volume, are: |
| A. | length 30 cm, breadth 25 cm, height 30 cm |
| B. | length 39 cm, breadth 25 cm, height 32 cm |
| C. | length 27 cm, breadth 27 cm, height 48 cm |
| D. | length 220 cm, breadth 25 cm, height 40 cm |
| Answer» C. length 27 cm, breadth 27 cm, height 48 cm | |
| 65. |
Ratio of permissible stress in direct compression and bending compression is |
| A. | less than 1 |
| B. | between 1 and 1.5 |
| C. | between 1.5 and 2.0 |
| D. | greater than 2 |
| Answer» A. less than 1 | |
| 66. |
Concrete containing |
| A. | siliceous aggregates, has higher co-efficient of expansion |
| B. | igneous aggregates, has intermediate coefficient of expansion |
| C. | lime stones, has lowest co-efficient of expansion |
| D. | all the above |
| Answer» D. all the above | |
| 67. |
The lower water cement ratio in concrete, introduces |
| A. | smaller creep and shrinkage |
| B. | greater density and smaller permeability |
| C. | improved frost resistance |
| D. | all the above |
| Answer» D. all the above | |
| 68. |
In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on |
| A. | the front face in one direction |
| B. | the front face in both directions |
| C. | the inner face in one direction |
| D. | the inner face in both directions |
| Answer» C. the inner face in one direction | |
| 69. |
The aggregate containing moisture in pores and having its surface dry, is known as |
| A. | moist aggregates |
| B. | very dry aggregates |
| C. | dry aggregates |
| D. | saturated surface dry aggregate |
| Answer» D. saturated surface dry aggregate | |
| 70. |
Pick up the correct statement from the following: |
| A. | construction joints in columns are provided a few cm below the junction of beam |
| B. | construction joints in columns are provided at the bottom hunching |
| C. | construction joints in beams and slabs are provided within middle third |
| D. | all the above |
| Answer» D. all the above | |
| 71. |
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is |
| A. | 0.43 d |
| B. | 0.55 d |
| C. | 0.68 d |
| D. | 0.85 d |
| Answer» A. 0.43 d | |
| 72. |
Pick up the correct proportions of chemical ingredients of cement |
| A. | lime : silica : alumina : iron oxide : 63 : 22 : 6 : 3 |
| B. | silica : lime : alumina : iron oxide : 63 : 22 : 6 : 3 |
| C. | alumina : silica : lime : iron oxide : 63 : 22 : 6 : 3 |
| D. | iron oxide : alumina : silica : lime : 63 : 22 : 6 : 3 |
| Answer» A. lime : silica : alumina : iron oxide : 63 : 22 : 6 : 3 | |
| 73. |
Internal friction between the ingredients of concrete, is decreased by using |
| A. | less water |
| B. | fine aggregates |
| C. | rich mix |
| D. | more water and coarse aggregates |
| Answer» D. more water and coarse aggregates | |
| 74. |
Pick up the correct statement from the following: |
| A. | the quality of water governs the strength of concrete |
| B. | 10% excess of water reduces the strength of concrete by 15% |
| C. | 30% excess of water reduces the strength of concrete by 50% |
| D. | all the above |
| Answer» D. all the above | |
| 75. |
Pick up the correct statement from the following: |
| A. | lime in excess, causes the cement to expand and disintegrate |
| B. | silica in excess, causes the cement to set slowly |
| C. | alumina in excess, reduces the strength of the cement |
| D. | all the above |
| Answer» D. all the above | |
| 76. |
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» D. 2700 bags | |
| 77. |
The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called |
| A. | segregation |
| B. | bleeding |
| C. | bulking |
| D. | creep |
| Answer» B. bleeding | |
| 78. |
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» A. rounded aggregate | |
| 79. |
For preparing ordinary concrete, the quantity of water used, is |
| A. | 5% by weight of aggregates plus 20% of weight of cement |
| B. | 10% by weight of aggregates plus 10% of weight of cement |
| C. | 5% by weight of aggregates plus 30% of weight of cement |
| D. | 30% by weight of aggregates plus 10% of weight of cement |
| Answer» C. 5% by weight of aggregates plus 30% of weight of cement | |
| 80. |
Finer grinding of cement |
| A. | affects only the early development of strength |
| B. | affects only the ultimate strength |
| C. | both (a) and (b) |
| D. | does not affect the strength |
| Answer» A. affects only the early development of strength | |
| 81. |
The light weight aggregates are obtained from |
| A. | sedimentary rocks |
| B. | metamorphic rocks |
| C. | igneous rocks |
| D. | volcanic source |
| Answer» D. volcanic source | |
| 82. |
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 | |
| 83. |
For walls, columns and vertical faces of all structural members, the form work is generally removed after |
| A. | 24 to 48 hours |
| B. | 3 days |
| C. | 7 days |
| D. | 14 days |
| Answer» A. 24 to 48 hours | |
| 84. |
Efflorescence in cement is caused due to an excess of |
| A. | alumina |
| B. | iron oxide |
| C. | silica |
| D. | alkalis |
| Answer» D. alkalis | |
| 85. |
For given workability the grading requiring the least amount of water is one that gives |
| A. | greatest surface area for the given cement and aggregates |
| B. | least surface area for the given cement and aggregates |
| C. | least weight for the given cement and aggregates |
| D. | greatest weight for the given cement and aggregates |
| Answer» A. greatest surface area for the given cement and aggregates | |
| 86. |
Minimum pitch of transverse reinforcement in a column is |
| A. | the least lateral dimension of the member |
| B. | sixteen times the smallest diameter of longitudinal reinforcement bar to be tied |
| C. | forty-eight times the diameter of transverse reinforcement |
| D. | lesser of the above three values |
| Answer» D. lesser of the above three values | |
| 87. |
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. | by rubbing cement in between fingers, one should feed rough |
| D. | all the above |
| Answer» D. all the above | |
| 88. |
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 | |
| 89. |
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» C. compaction factor test | |
| 90. |
The effect of creep on modular ratio is |
| A. | to decrease it |
| B. | to increase it |
| C. | either to decrease or to increase it |
| D. | to keep it unchanged |
| Answer» B. to increase it | |
| 91. |
The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is |
| A. | rounded aggregate |
| B. | irregular aggregate |
| C. | angular aggregate |
| D. | flaky aggregate |
| Answer» A. rounded aggregate | |
| 92. |
The maximum percentage of chemical ingredient of cement is that of |
| A. | magnesium oxide |
| B. | iron oxide |
| C. | silica |
| D. | lime |
| Answer» D. lime | |
| 93. |
The commercial name of white and coloured cement in India, is |
| A. | colorcrete |
| B. | silvicrete |
| C. | snowcem |
| D. | all the above |
| Answer» D. all the above | |
| 94. |
An excess of flaky particles in concrete aggregates |
| A. | decreases the workability |
| B. | increases the quantity of water and sand |
| C. | more than 15% are not desirable |
| D. | all the above |
| Answer» D. all the above | |
| 95. |
Increase in the moisture content in concrete |
| A. | reduces the strength |
| B. | increases the strength |
| C. | does not change the strength |
| D. | all of the above |
| Answer» A. reduces the strength | |
| 96. |
The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be |
| A. | between 150 to 300 kg/cm2 |
| B. | between 350 to 600 kg/cm2 |
| C. | between 150 to 500 kg/cm2 |
| D. | below 200 kg/cm2 |
| Answer» D. below 200 kg/cm2 | |
| 97. |
Select the incorrect statement |
| A. | lean mixes bleed more as compared to rich ones. |
| B. | bleeding can be minimized by adding pozzolana finer aggregate |
| C. | bleeding can be increased by addition \of calcium chloride |
| D. | none of the above |
| Answer» D. none of the above | |
| 98. |
Permissible compressive strength of M 150 concrete grade is |
| A. | 100 kg/cm2 |
| B. | 150 kg/cm2 |
| C. | 200 kg/cm2 |
| D. | 250 kg/cm2 |
| Answer» C. 200 kg/cm2 | |
| 99. |
Cement used for normal concrete construction, is obtained by burning a mixture of |
| A. | siliceous and argillaceous materials |
| B. | argillaceous and calcareous materials |
| C. | siliceous and calcareous materials |
| D. | siliceous, argillaceous and calcareous materials |
| Answer» D. siliceous, argillaceous and calcareous materials | |
| 100. |
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. | higher initial and final setting times |
| D. | lower initial and final setting times |
| Answer» A. higher initial setting time but lower final setting time | |
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