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.
| 1. |
If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than |
| A. | 27 mm |
| B. | 37 mm |
| C. | 47 mm |
| D. | 57 mm |
| Answer» B. 37 mm | |
| 2. |
The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is |
| A. | 15 N/mm2 |
| B. | 20 N/mm2 |
| C. | 25 N/mm2 |
| D. | 30 N/mm2 |
| Answer» D. 30 N/mm2 | |
| 3. |
Tricalcium silicate develops strength in cement for first 7 days. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 4. |
The aggregate is said to be flaky when |
| A. | its least dimension is three-fifth of its mean dimension |
| B. | its least dimension is equal to its mean dimension |
| C. | its length is equal to its mean dimension |
| D. | its length is equal to 1.8 times its mean dimension |
| Answer» B. its least dimension is equal to its mean dimension | |
| 5. |
An aggregate is said to be |
| A. | coarse |
| B. | fine |
| C. | cyclopean |
| Answer» D. | |
| 6. |
The value of bulk density for angular and flaky aggregates is |
| A. | same |
| B. | less |
| C. | more |
| Answer» C. more | |
| 7. |
The impact value of an aggregate is generally used as an alternative to its crushing value, to know the quality of aggregate. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 8. |
The aggregate is said to be elongated when |
| A. | its least dimension is three-fifth of its mean dimension |
| B. | its least dimension is equal to its mean dimension |
| C. | its length is equal to its mean dimension |
| D. | its length is equal to 1.8 times its mean dimension |
| Answer» E. | |
| 9. |
The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be |
| A. | 1.25 |
| B. | 1.5 |
| C. | 2 |
| D. | 2.5 |
| Answer» B. 1.5 | |
| 10. |
The main requirement, which a ware-house should fulfil is that |
| A. | its walls should be water proof masonry construction |
| B. | its roof should be leak-proof |
| C. | it must have large number of windows |
| D. | its plinth should be very high |
| Answer» F. | |
| 11. |
If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 12. |
If the slump of the concrete mix is less than 50 mm, then while compacting it with vibratiors, the segregation will not take place. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 13. |
For heat and sound insulation purposes, we shall use |
| A. | vacuum concrete |
| B. | air-entrained concrete |
| C. | saw dust concrete |
| D. | both (b) and (c) |
| Answer» E. | |
| 14. |
The finer the sand, greater is the bulkage. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 15. |
The most useless aggregate is, whose surface texture is |
| A. | smooth |
| B. | glossy |
| C. | granular |
| D. | porous |
| Answer» C. granular | |
| 16. |
A moist aggregate is one |
| A. | whose all the pores are filled with water and also having its surface wet |
| B. | whose all the pores are filled with water but having its surface dry |
| C. | which do not contain any moisture either in the pores or on the surface |
| D. | which may contain some moisture in the pores but having dry surface |
| Answer» B. whose all the pores are filled with water but having its surface dry | |
| 17. |
For batching 1 : 2 : 4 concrete mix by volume, the ingredients required per bag of cement are |
| A. | 50 kg of cement : 70 kg of fine aggregate : 140 kg of coarse aggregate |
| B. | 50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate |
| C. | 50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate |
| D. | 50 kg of cement : 100 litres of fine aggregate : 200 litres of coarse aggregate |
| Answer» C. 50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate | |
| 18. |
A suitable admixture added at the time of preparing the concrete mix, makes the concrete. |
| A. | water proof |
| B. | acid proof |
| C. | highly strong |
| D. | all of these |
| Answer» E. | |
| 19. |
Reinforced cement concrete is equally strong in taking |
| A. | tensile and compressive stresses |
| B. | compressive and shear stresses |
| C. | tensile, compressive and shear stresses |
| D. | tensile and shear stresses |
| Answer» D. tensile and shear stresses | |
| 20. |
The strength and durability of concrete depends upon |
| A. | size of aggregates |
| B. | grading of aggregates |
| C. | moisture contents of aggregates |
| D. | all of these |
| Answer» E. | |
| 21. |
Concrete with higher compaction factor has less workability. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
The value of bulk density of the aggregate depends upon |
| A. | size distribution of aggregate |
| B. | shape of aggregate |
| C. | specific gravity of aggregate |
| D. | all of these |
| Answer» E. | |
| 23. |
The bulk density of aggregates depends upon its |
| A. | shape |
| B. | grading |
| C. | compaction |
| D. | all of these |
| Answer» E. | |
| 24. |
The concrete in which preliminary tests are performed for designing the mix is called |
| A. | rich concrete |
| B. | controlled concrete |
| C. | lean concrete |
| D. | ordinary concrete |
| Answer» C. lean concrete | |
| 25. |
The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as |
| A. | fineness |
| B. | soundness |
| C. | setting time |
| D. | none of these |
| Answer» C. setting time | |
| 26. |
In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt in a |
| A. | country kiln |
| B. | continuous flare kiln |
| C. | rotary kiln |
| D. | all of these |
| Answer» D. all of these | |
| 27. |
Trowelling should be finished on the same day of its laying operation. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 28. |
The placing of concrete should start width-wide in reinforced cement concrete slabs from one end. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 29. |
The type of lime used in lime concrete is |
| A. | fat lime |
| B. | poor lime |
| C. | slaked lime |
| D. | hydraulic lime |
| Answer» E. | |
| 30. |
The presence of dicalcium silicate in cement |
| A. | hydrates the cement slowly |
| B. | generates less heat of hydration |
| C. | has more resistance to sulphate attack |
| D. | all of these |
| Answer» E. | |
| 31. |
The continuous strain, which the concrete undergoes due to application of external loads, is called |
| A. | workability |
| B. | bleeding |
| C. | segregation |
| D. | creep |
| Answer» E. | |
| 32. |
The maximum particle size of coarse aggregate is |
| A. | 45 mm |
| B. | 55 mm |
| C. | 65 mm |
| D. | 75 mm |
| Answer» E. | |
| 33. |
The usual proportion of ingredients in reinforced cement concrete is |
| A. | Portland cement (1 part), clean sand (2 to 4 parts) and coarse aggregate (1 to 2 parts) |
| B. | Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts) |
| C. | Porland cement (1 part), clean sand and coarse aggregate (2 to 4 parts) |
| D. | any one of the above |
| Answer» C. Porland cement (1 part), clean sand and coarse aggregate (2 to 4 parts) | |
| 34. |
Segregation in concrete results in |
| A. | honey combing |
| B. | porous layers |
| C. | surface scaling |
| D. | all of these |
| Answer» E. | |
| 35. |
The admixtures are added in concrete to |
| A. | accelerate the rate of setting and hardening of cement |
| B. | make the concrete water proof, acid proof etc. |
| C. | reduce the bleeding and segregation of concrete mix |
| D. | all of the above |
| Answer» E. | |
| 36. |
Alumina in the cement lowers the clinkering temperature. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 37. |
When the sand is fully saturated, its volume is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 38. |
The presence of tricalcium silicate in cement |
| A. | hydrates the cement rapidly |
| B. | generates less heat of hydration |
| C. | offers high resistance to sulphate attack |
| D. | all of these |
| Answer» B. generates less heat of hydration | |
| 39. |
Vibrated concrete needs |
| A. | less |
| B. | high |
| Answer» B. high | |
| 40. |
The workability of concrete mix increases with the increase in moisture content. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 41. |
The controlled concrete is used for |
| A. | one grade of concrete mix |
| B. | three grades of concrete mix |
| C. | five grades of concrete mix |
| D. | all the seven grades of concrete mix |
| Answer» E. | |
| 42. |
If sea water is used for preparing concrete mix, it |
| A. | reduces strength |
| B. | corrodes steel reinforcement |
| C. | causes efflorescence |
| D. | all of these |
| Answer» E. | |
| 43. |
According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that |
| A. | the residue does not exceed 10% when sieved through IS sieve No. 9 |
| B. | its expansion is not more than 10 mm for unaerated cement |
| C. | its initial setting time is not less than 30 minutes |
| D. | all of the above |
| Answer» E. | |
| 44. |
The cement concrete, from which entrained air and excess water are removed after placing it in position, is called |
| A. | vacuum concrete |
| B. | light weight concrete |
| C. | prestressed concrete |
| D. | sawdust concrete |
| Answer» B. light weight concrete | |
| 45. |
The concrete can be lifted by pumps through a maximum vertical distance of |
| A. | 10 m |
| B. | 20 m |
| C. | 30 m |
| D. | 50 m |
| Answer» E. | |
| 46. |
The mixer, which produces a steady stream of concrete as long as it is in operation, is known as |
| A. | non-tilling batch mixer |
| B. | tilting type batch mixer |
| C. | continuous mixer |
| D. | none of these |
| Answer» D. none of these | |
| 47. |
The 'first-in, first-out' rule should eb applied when cement hags are to be removed from the ware-house. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 48. |
Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 49. |
The presence of lime in cement |
| A. | makes the cement sound |
| B. | provides strength to the cement |
| C. | lowers the clinkering temperature |
| D. | all of these |
| Answer» C. lowers the clinkering temperature | |
| 50. |
The placement of concrete should be discontinued during rainy periods |
| A. | Yes |
| B. | No |
| Answer» B. No | |