McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 351. |
The most useless aggregate is, whose surface texture is |
| A. | smooth |
| B. | glossy |
| C. | granular |
| D. | porous |
| Answer» B. glossy | |
| 352. |
High temperature |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 353. |
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» D. all of these | |
| 354. |
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» A. whose all the pores are filled with water and also having its surface wet | |
| 355. |
The finer the sand, greater is the bulkage. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 356. |
The fineness of cement is measured in terms of |
| A. | percentage weight retained on IS sieve number 9 |
| B. | surface area in cm2 per gram of the cement |
| C. | either (a) or (b) |
| D. | none of these |
| Answer» C. either (a) or (b) | |
| 357. |
For the manufacture of concrete of low density, the aggregate used is |
| A. | furnace clinker |
| B. | coke breeze |
| C. | saw dust |
| D. | all of these |
| Answer» D. all of these | |
| 358. |
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» D. all of these | |
| 359. |
High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in |
| A. | rapid hardening |
| B. | high erly strength |
| C. | high heat generation |
| D. | none of these |
| Answer» D. none of these | |
| 360. |
When vibrators are used for compaction, the consistency of concrete depends upon the |
| A. | type of mix |
| B. | placing conditions |
| C. | efficiency of vibrator |
| D. | all of these |
| Answer» D. all of these | |
| 361. |
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» C. tensile, compressive and shear stresses | |
| 362. |
The process of mixing, transporting, placing and compacting the cement concrete should not take more than |
| A. | 30 minutes |
| B. | 60 minutes |
| C. | 90 minutes |
| D. | 120 minutes |
| Answer» A. 30 minutes | |
| 363. |
The material having particle size varying from 0.002 to 0.06 mm is termed as |
| A. | silt |
| B. | clay |
| C. | sand |
| D. | none of these |
| Answer» A. silt | |
| 364. |
The strength of cement concrete increases with the increase of water cement ratio. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 365. |
The bulk density of aggregates depends upon its |
| A. | shape |
| B. | grading |
| C. | compaction |
| D. | all of these |
| Answer» D. all of these | |
| 366. |
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 |
| E. | Both (a) and (b) |
| Answer» E. Both (a) and (b) | |
| 367. |
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» A. Right | |
| 368. |
The compressive strength of an ordinary Portland cement (1 : 3 cement mortar cube) after 7 days test should not be less than |
| A. | 11 N/mm2 |
| B. | 17.5 N/mm2 |
| C. | 22 N/mm2 |
| D. | 27.5 N/mm2 |
| Answer» B. 17.5 N/mm2 | |
| 369. |
If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 370. |
Concrete with higher compaction factor has less workability. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 371. |
The aggregates of |
| A. | irregular |
| B. | angular |
| C. | rounded |
| D. | flaky |
| Answer» C. rounded | |
| 372. |
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» A. 1.25 | |
| 373. |
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» B. 50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate | |
| 374. |
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» D. both (b) and (c) | |
| 375. |
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» D. all of these | |
| 376. |
Which of the following statement is wrong? |
| A. | The coarse sand produces a harsh and unworkable mix. |
| B. | An admixture cannot increase the workability of concrete without increasing water content. |
| C. | Salts of manganese cause a considerable reduction in the strength of concrete. |
| D. | all of the above |
| Answer» B. An admixture cannot increase the workability of concrete without increasing water content. | |
| 377. |
Insufficient quantity of water |
| A. | makes the concrete mix harsh |
| B. | makes the concrete mix unworkable |
| C. | causes segregation in concrete |
| D. | causes bleeding in concrete |
| Answer» B. makes the concrete mix unworkable | |
| 378. |
In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt at a temperature between |
| A. | 900? to 1000?C |
| B. | 1000?C to 1200?C |
| C. | 1200?C to 1500?C |
| D. | 1500?C to 1600?C |
| Answer» D. 1500?C to 1600?C | |
| 379. |
The practical utility of concrete technology for civil engineers is to |
| A. | enable them to know how to stock properly the materials required for concrete |
| B. | enable them to perform different tests concerning concrete |
| C. | make them conversant with fundamental principles of concrete |
| D. | all of the above |
| Answer» D. all of the above | |
| 380. |
Water-cement ratio is, usually, expressed in |
| A. | litres of water required per bag of cement |
| B. | litres of water required per kg of cement |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» A. litres of water required per bag of cement | |
| 381. |
With the moisture content of 5 to 10% by weight, the bulking of sand is increased by |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 50% |
| Answer» D. 50% | |
| 382. |
For continuous transportation of concrete, the method used is |
| A. | transport of concrete by pans |
| B. | transport of concrete by wheel barrows |
| C. | transport of concrete by belt concrete conveyors |
| D. | transport of concrete by pumps |
| Answer» C. transport of concrete by belt concrete conveyors | |
| 383. |
Which of the following statement is correct? |
| A. | Duff Abram's law is valid only when the concrete is of workable plasticity. |
| B. | If the water-cement ratio is less, the strength of concrete will be less. |
| C. | The strength of concrete decreases with age. |
| D. | A rich mix of concrete provides low strength than a lean mix. |
| Answer» A. Duff Abram's law is valid only when the concrete is of workable plasticity. | |
| 384. |
The function of aggregates in concrete is to serve as |
| A. | binding material |
| B. | filler |
| C. | catalyst |
| D. | all of these |
| Answer» B. filler | |
| 385. |
The breaking up of cohesion in a mass of concrete is called |
| A. | workability |
| B. | bleeding |
| C. | segregation |
| D. | creep |
| Answer» C. segregation | |
| 386. |
The Vee-Bee test is suitable for concrete mixes of low and very low workabilities. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 387. |
The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve is called |
| A. | cyclopean aggregate |
| B. | coarse aggregate |
| C. | fine aggregate |
| D. | all-in-aggregate |
| Answer» C. fine aggregate | |
| 388. |
Efflorescence in cement is caused due to the excess of |
| A. | silica |
| B. | lime |
| C. | alkalies |
| D. | iron oxide |
| Answer» C. alkalies | |
| 389. |
Which of the following grade is not recommended by IS 456-1978? |
| A. | M 10 |
| B. | M 20 |
| C. | M 40 |
| D. | M 55 |
| Answer» D. M 55 | |
| 390. |
The deleterious materials present in the aggregate |
| A. | prevent normal hydration of cement |
| B. | reduce the strength and durability of concrete |
| C. | modify the setting action and cause efflorescence |
| D. | all of the above |
| Answer» D. all of the above | |
| 391. |
Ferro-concrete is another name given to |
| A. | plain cement concrete |
| B. | reinforced cement concrete |
| C. | prestressed cement concrete |
| D. | none of these |
| Answer» B. reinforced cement concrete | |
| 392. |
The use of air-entraining agents in concrete |
| A. | increases workability of concrete |
| B. | decreases bleeding |
| C. | decreases strength |
| D. | all of these |
| Answer» D. all of these | |
| 393. |
The characteristic, which makes the concrete a versatile and widely used material of modern consturction, is the possibility of |
| A. | controlling the properties of concrete by using appropriate ingredients |
| B. | moulding the concrete in any desired shape |
| C. | complete mechanisation of concrete preparation and its placing process |
| D. | all of the above |
| Answer» D. all of the above | |
| 394. |
The concrete in which no preliminary tests are performed for designing the mix is called |
| A. | rich concrete |
| B. | controlled concrete |
| C. | lean concrete |
| D. | ordinary concrete |
| Answer» D. ordinary concrete | |
| 395. |
The cement concrete having water-cement ratio less than 0.45 by weight, causes honey-comb structure. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 396. |
The workability of concrete is defined as the |
| A. | ease with which it can be mixed, transported and placed in position in a homogeneous state |
| B. | breaking up of cohesion in a mass of concrete |
| C. | separation of water or water-cement mixture from the freshly mixed concrete |
| D. | none of the above |
| Answer» A. ease with which it can be mixed, transported and placed in position in a homogeneous state | |
| 397. |
Low heat cement is used in |
| A. | thin |
| B. | thick |
| Answer» B. thick | |
| 398. |
The removal of excess air after placing concrete helps in increasing the strength of concrete by |
| A. | 15 to 20% |
| B. | 20 to 30% |
| C. | 30 to 50% |
| D. | 50 to 70% |
| Answer» A. 15 to 20% | |
| 399. |
In voids method of determining the quantity of cement paste, it is assumed that the |
| A. | voids in the coarse aggregate are filled by the fine aggregates |
| B. | volume of fine aggregates required for 1 m3 of coarse aggregate is equal to total voids in coarse aggregate plus 10% aggregate extra to allow for additional voids created by wedging action |
| C. | volume of cement paste required for 1 m3 of coarse aggregate is equal to total volum of voids in the fine aggregate plus 15% aggregate extra to allow for additional voids created be wedging action |
| D. | all of the above |
| Answer» D. all of the above | |
| 400. |
The mass concrete in piers and abutments, the grade of concrete mix used, is |
| A. | 1 ; 1 : 2 |
| B. | 1 ; 1.5 : 3 |
| C. | 1 ; 2 : 4 |
| D. | 1 ; 3 : 6 |
| Answer» D. 1 ; 3 : 6 | |
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