McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 301. |
The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from |
| A. | 50 to 60% |
| B. | 60 to 70% |
| C. | 70 to 80% |
| D. | 80 to 90% |
| Answer» C. 70 to 80% | |
| 302. |
The percentage of water for making a cement paste of normal consistency varies from |
| A. | 15 to 25% |
| B. | 25 to 35% |
| C. | 35 to 50% |
| D. | 50 to 60% |
| Answer» B. 25 to 35% | |
| 303. |
Vertical sides of columns may be stripped after |
| A. | 1 to 2 days |
| B. | 7 days |
| C. | 14 days |
| D. | 21 days |
| Answer» A. 1 to 2 days | |
| 304. |
Rapid hardening cement is used |
| A. | where high early strength is desired |
| B. | where form work is to be removed as early as possible |
| C. | for constructing road pavements |
| D. | all of the above |
| Answer» D. all of the above | |
| 305. |
If 30% excess water is added, the strength of concrete is reduced by |
| A. | 30% |
| B. | 40% |
| C. | 50% |
| D. | 60% |
| Answer» C. 50% | |
| 306. |
Which of the following statement is correct while compacting concrete with vibrators? |
| A. | The vibrator should be inserted horizontally. |
| B. | The vibrator should not be immersed through a full depth of freshly laid concrete. |
| C. | The vibrator should not touch the form surface. |
| D. | all of the above |
| Answer» C. The vibrator should not touch the form surface. | |
| 307. |
The slump test of concrete is used to mesure its |
| A. | consistency |
| B. | mobility |
| C. | homogeneity |
| D. | all of these |
| Answer» A. consistency | |
| 308. |
The importance of storing the various ingredients of concrete is |
| A. | to maintain the uniformity of grading |
| B. | to maintain the uniformity of moisture |
| C. | to maintain the strength of materials |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 309. |
The resistance of an aggregate to wear is known as |
| A. | shear value |
| B. | crushing value |
| C. | abrasion value |
| D. | impact value |
| Answer» C. abrasion value | |
| 310. |
The magnesium oxide and sulphur dioxide when added in excess quantity makes the cement unsound. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 311. |
The minimum quantity of cement to be used in controlled concrete is specified as |
| A. | 120 kg / cm3 |
| B. | 160 kg / cm3 |
| C. | 220 kg / cm3 |
| D. | 280 kg / cm3 |
| Answer» C. 220 kg / cm3 | |
| 312. |
The aggregates of rounded shape require minimum cement paste to make good concrete. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 313. |
For performing the compressive strength test of cement, the size of cube mould should be 7.06 cm side. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 314. |
The value of finencess modulus for fine sand may range between |
| A. | 1.1 to 1.3 |
| B. | 1.3 to 1.6 |
| C. | 1.6 to 2.2 |
| D. | 2.2 to 2.6 |
| Answer» D. 2.2 to 2.6 | |
| 315. |
The final operation of finishing the concrete surface is called |
| A. | screeding |
| B. | floating |
| C. | trowelling |
| D. | none of these |
| Answer» C. trowelling | |
| 316. |
Segregation of concrete increases the strength of concrete. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 317. |
The resistance of an aggregate to compressive forces is known as |
| A. | crushing value |
| B. | impact value |
| C. | abrasion value |
| D. | none of these |
| Answer» A. crushing value | |
| 318. |
According to the rule of water cement ratio, the strength of concrete wholly depends upon |
| A. | the quality of cement |
| B. | the quality of cement mixed with aggregate |
| C. | the amount of water used in preparation of concrete mix |
| D. | all of the above |
| Answer» C. the amount of water used in preparation of concrete mix | |
| 319. |
The process of proper and accurate measurement of all concrete materials for uniformity of proportions and aggregate grading is called |
| A. | proportioning |
| B. | grading |
| C. | mixing |
| D. | batching |
| Answer» D. batching | |
| 320. |
The minimum particle size of coarse aggregate is |
| A. | 2.5 mm |
| B. | 4.75 mm |
| C. | 5.85 mm |
| D. | 6.5 mm |
| Answer» B. 4.75 mm | |
| 321. |
The concrete without any reinforcement has |
| A. | low |
| B. | high |
| Answer» A. low | |
| 322. |
A mix with water-cement ratio of 0.78 is termed as wet mix. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 323. |
Cement concrete is |
| A. | permeable |
| B. | impermeable |
| Answer» B. impermeable | |
| 324. |
Vicat's apparatus is used to perform |
| A. | fineness test |
| B. | soundness test |
| C. | consistency test |
| D. | compressive strength test |
| Answer» C. consistency test | |
| 325. |
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» B. provides strength to the cement | |
| 326. |
The construction joints in cement concrete |
| A. | should be located where bending moment is large |
| B. | should be located where shear force is large |
| C. | should not be provided at the corners |
| D. | should be spaced at a distance of 3 m apart in case of huge structures |
| Answer» C. should not be provided at the corners | |
| 327. |
During field test, the cement is said to be pure and of good quality when |
| A. | the colour of cement is uniformly greenish grey |
| B. | a handful of cement, thrown into a bucket of water, floats |
| C. | hand is thrusted into a bag of cement, it feels cool |
| D. | all of the above |
| Answer» D. all of the above | |
| 328. |
A good concrete should have minimum thermal expansion. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 329. |
Workability of concrete mix having very low water-cement ratio should be obtained by |
| A. | flexural strength test |
| B. | slump test |
| C. | compaction factor test |
| D. | any one of these |
| Answer» C. compaction factor test | |
| 330. |
The process of removing the irregularities from the surface of concrete left after screeding is called floating. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 331. |
Each layer of concrete placed in the mould, in preliminary test, is compacted 25 times with a 20 mm diameter rod and 60 cm in length |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 332. |
"Colocrete" is the commercial term for |
| A. | high alumina cement |
| B. | coloured cement |
| C. | low heat cement |
| D. | rapid hardening cement |
| Answer» B. coloured cement | |
| 333. |
In transportation of concrete by pumps |
| A. | the slump should not be less than 50 mm and more than 80 mm |
| B. | the water cement ratio should remain between 0.5 to 0.65 |
| C. | the number of bends in a pipe line should be as small as possible |
| D. | all of the above |
| Answer» D. all of the above | |
| 334. |
When the batching of material is done by weight |
| A. | the bucket in which the material is to be weighed should be cleaned thoroughly |
| B. | the weighing machine should be levelled before placing the material |
| C. | the chart should be prepared indicating the weight of each material used for different strengths of concrete |
| D. | all of the above |
| Answer» D. all of the above | |
| 335. |
The workability of concrete can be improved by adding |
| A. | hydrated lime |
| B. | flyash |
| C. | calcium chloride |
| D. | all of these |
| Answer» D. all of these | |
| 336. |
In order to provide colour, hardness and strength to the cement, the ingredient used is |
| A. | lime |
| B. | silica |
| C. | alumina |
| D. | iron oxide |
| Answer» D. iron oxide | |
| 337. |
In performing the works test |
| A. | the mould for test specimen should be made of non-absorbent material |
| B. | the mould should be constructed in such a way that there is leakage of water from test specimen during moulding |
| C. | the base plate of the mould should be of non-absorbent material |
| D. | all of the above |
| Answer» D. all of the above | |
| 338. |
The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be |
| A. | 63 : 22 : 6 : 3 |
| B. | 62 : 22 : 3 : 6 |
| C. | 22 : 63 : 6 : 3 |
| D. | 22 : 63 : 3 : 6 |
| Answer» A. 63 : 22 : 6 : 3 | |
| 339. |
The process of consolidating concrete mix after placing it in position is termed as |
| A. | curing |
| B. | wetting |
| C. | compaction |
| D. | none of these |
| Answer» C. compaction | |
| 340. |
The main object of proportioning concrete is to obtain |
| A. | required strength and workability |
| B. | desired durability |
| C. | water tightness |
| D. | all of these |
| Answer» D. all of these | |
| 341. |
If the water cement ratio is more, then the |
| A. | strength of concrete will be less |
| B. | durability of concrete will be less |
| C. | capillary voids will be more in the physical structure of hydrated cement |
| D. | all of the above |
| Answer» D. all of the above | |
| 342. |
After the final grinding, the cement is sieved through IS sieve number |
| A. | 9 |
| B. | 12 |
| C. | 24 |
| D. | 48 |
| Answer» A. 9 | |
| 343. |
Blast furnace slag cement |
| A. | develops low heat of hydration |
| B. | has less early strength |
| C. | develops high heat of hydration |
| D. | has high early strength |
| E. | Both (a) and (b) |
| Answer» E. Both (a) and (b) | |
| 344. |
The change of state of cement paste from fluid to solid is called hardening. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 345. |
The compaction factor is the ratio of weight of partially compacted concrete to the weight of fully compacted concrete. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 346. |
Argillaceous materials contain |
| A. | calcium |
| B. | lime |
| C. | alumina |
| Answer» C. alumina | |
| 347. |
If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1 : 2 : 4, then the grade of concrete is |
| A. | M 10 |
| B. | M 15 |
| C. | M 20 |
| D. | M 25 |
| Answer» B. M 15 | |
| 348. |
The rule of water cement ratio was established by |
| A. | Duff Abram |
| B. | Plowman |
| C. | W. Simms |
| D. | Dr. Karl Terzaghi |
| Answer» A. Duff Abram | |
| 349. |
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» A. Yes | |
| 350. |
The workability of concrete is expressed by |
| A. | water-cement ratio |
| B. | slump value |
| C. | compaction factor |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
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