McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 251. |
The diameter of the pipe line used for transportation of concrete by pumps should not exceed |
| A. | 10 cm |
| B. | 20 cm |
| C. | 30 cm |
| D. | 40 cm |
| Answer» C. 30 cm | |
| 252. |
The inert mineral material used for the manufacture of mortars and concretes is |
| A. | cement |
| B. | water |
| C. | aggregate |
| D. | admixture |
| Answer» C. aggregate | |
| 253. |
Which of the following cements is expected to have the highest compressive strength after 3 days. |
| A. | ordinary Portland cement |
| B. | rapid hardening cement |
| C. | high alumina cement |
| D. | sulphate resisting cement |
| Answer» C. high alumina cement | |
| 254. |
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» C. rotary kiln | |
| 255. |
The knowledge of a standard consistency of a cement paste is essential to perform |
| A. | setting time test |
| B. | soundness test |
| C. | compressive strength test |
| D. | all of these |
| Answer» D. all of these | |
| 256. |
The placing of concrete should start width-wide in reinforced cement concrete slabs from one end. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 257. |
The separation of water or water-cement mixture from the freshly mixed concrete is known as bleeding. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 258. |
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» B. soundness | |
| 259. |
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» B. controlled concrete | |
| 260. |
The type of lime used in lime concrete is |
| A. | fat lime |
| B. | poor lime |
| C. | slaked lime |
| D. | hydraulic lime |
| Answer» D. hydraulic lime | |
| 261. |
Segregation in concrete results in |
| A. | honey combing |
| B. | porous layers |
| C. | surface scaling |
| D. | all of these |
| Answer» D. all of these | |
| 262. |
The sum of percentages of all deleterious materials in the aggregate shall not exceed |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» A. 5% | |
| 263. |
In Vicat's apparatus, the diameter of Vicat plunger is |
| A. | 5 mm |
| B. | 10 mm |
| C. | 15 mm |
| D. | 20 mm |
| Answer» B. 10 mm | |
| 264. |
Tricalcium silicate develops strength in cement for first 7 days. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 265. |
Which of the following statement is correct? |
| A. | Harshness in concrete mix increases if finer aggregates to fill the voids in coarse aggregates are less. |
| B. | As the internal friction of aggregates increases, the workability of concrete decreases. |
| C. | As the slump value increases, the workability of concrete also increases. |
| D. | all of the above |
| Answer» D. all of the above | |
| 266. |
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» D. all of these | |
| 267. |
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» B. Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts) | |
| 268. |
Trowelling should be finished on the same day of its laying operation. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 269. |
The continuous strain, which the concrete undergoes due to application of external loads, is called |
| A. | workability |
| B. | bleeding |
| C. | segregation |
| D. | creep |
| Answer» D. creep | |
| 270. |
The value of bulk density for angular and flaky aggregates is |
| A. | same |
| B. | less |
| C. | more |
| Answer» B. less | |
| 271. |
The development of first 28 days strength is on account of the hydration of |
| A. | dicalcium silicate |
| B. | tricalcium silicate |
| C. | tricalcium aluminate |
| D. | tetra calcium alumino ferrite |
| Answer» B. tricalcium silicate | |
| 272. |
The resistance of an aggregate to the effect of hydration of cement and weather is called |
| A. | crushing value |
| B. | impact value |
| C. | abrasion value |
| D. | soundness |
| Answer» D. soundness | |
| 273. |
For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed. |
| A. | 10 mm |
| B. | 15 mm |
| C. | 20 mm |
| D. | 40 mm |
| Answer» B. 15 mm | |
| 274. |
The slump whould not exceed 50 mm when compacting concrete with vibrators. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 275. |
The bulk density of an aggregate is the weight required to fill a container of unit volume. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 276. |
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» C. 1 : 4 ; 8 | |
| 277. |
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» A. screeding | |
| 278. |
The apparent specific gravity of an aggregate is defined as |
| A. | the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles |
| B. | the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles |
| C. | the weight of aggregate required to fill a container of unit volume |
| D. | the difference in weight of the aggregate in saturated surface dry condition and in moist condition |
| Answer» A. the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles | |
| 279. |
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» D. all of these | |
| 280. |
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» D. all of these | |
| 281. |
If the effective plan area of a warehouse is 54 m2, and the maximum height of pile permitted is 2.7 m, then the number of cement bags to be stord is |
| A. | 2000 |
| B. | 2200 |
| C. | 2500 |
| D. | 2700 |
| Answer» D. 2700 | |
| 282. |
A good concrete should be subjected to |
| A. | maximum |
| B. | minimum |
| Answer» B. minimum | |
| 283. |
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» C. the cement paste sets and develops strength | |
| 284. |
Under normal circumstances, the beam soffits may be removed after |
| A. | 2 days |
| B. | 7 days |
| C. | 14 days |
| D. | 21 days |
| Answer» B. 7 days | |
| 285. |
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» B. 1 ; 1.5 : 3 | |
| 286. |
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» C. 25 N/mm2 | |
| 287. |
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» D. 31 cm x 31 cm x 52 cm | |
| 288. |
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» A. preliminary test | |
| 289. |
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» D. both (a) and (b) | |
| 290. |
For high degree of workability, the compaction factor is |
| A. | 0.65 |
| B. | 0.75 |
| C. | 0.85 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 291. |
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» C. bulking factor | |
| 292. |
The object of curing is to |
| A. | prevent the loss of water by evaporation |
| B. | reduce the shrinkage of concrete |
| C. | preserve the properties of concrete |
| D. | all of these |
| Answer» D. all of these | |
| 293. |
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» B. curing | |
| 294. |
The prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the |
| A. | space between the exterior walls and piles should be 30 cm |
| B. | cement bags should be placed closer together in the piles |
| C. | width and height of the pile should not exceed 3 m and 2.70 m respectively |
| D. | all of the above |
| Answer» D. all of the above | |
| 295. |
According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of |
| A. | 1 ; 1 |
| B. | 1 ; 2 |
| C. | 1 ; 3 |
| D. | 1 ; 4 |
| Answer» C. 1 ; 3 | |
| 296. |
Which of the following statement is correct? |
| A. | Sulphate resisting cement is particularly used for canal lining. |
| B. | Low heat cement should not be used for thin concrete structures. |
| C. | Rapid hardening cement should not be used for massive concrete structures |
| D. | all of the above |
| Answer» D. all of the above | |
| 297. |
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» D. both (a) and (b) | |
| 298. |
The standard sand now used in India is obtained from |
| A. | Ennore (Chennai) |
| B. | Mumbai |
| C. | Orissa |
| D. | Jaipur |
| Answer» A. Ennore (Chennai) | |
| 299. |
Initial setting time of ordinary Portland cement is |
| A. | 15 min |
| B. | 30 min |
| C. | 60 min |
| D. | 10 h |
| Answer» B. 30 min | |
| 300. |
The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds |
| A. | 0.5 N / mm2 |
| B. | 1 N / mm2 |
| C. | 1.5 N / mm2 |
| D. | 2 N / mm2 |
| Answer» C. 1.5 N / mm2 | |
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