McqMate
| 401. |
Blast furnace slag cement is used for |
| A. | dams |
| B. | bridge abutments |
| C. | retaining walls |
| D. | all of these |
| Answer» D. all of these | |
| 402. |
If the slump of concrete mix is 70 mm, its workability is considered to be |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» C. medium | |
| 403. |
The prestressed cement concrete can take up high tensile and compressive stresses without development of cracks. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 404. |
The gypsum is added to the cement for |
| A. | providing high strength to the cement |
| B. | controlling the initial setting time of cement |
| C. | lowering the clinkering temperature of cement |
| D. | all of the above |
| Answer» B. controlling the initial setting time of cement | |
| 405. |
The degree of grinding of cement is called |
| A. | fineness |
| B. | soundness |
| C. | impact value |
| D. | bulking |
| Answer» A. fineness | |
| 406. |
In performing preliminary test |
| A. | the moulds requred for test specimens should be rigid |
| B. | the mxi should be stored in air=tight containers |
| C. | the aggregates should be dry |
| D. | all of the above |
| Answer» D. all of the above | |
| 407. |
To perform the soundness test, the water is added to the cement at the rate of 0.72 P by weight of cement, where P is the percentage of water required for normal consistency paste. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 408. |
Water cannot be used as a lubricant in concrete mix. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 409. |
The ordinary concrete is no used for |
| A. | M 10 |
| B. | M 20 |
| C. | M 25 |
| D. | M 40 |
| Answer» D. M 40 | |
| 410. |
Smaller size aggregates require less quantity of water for lubrication. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 411. |
When the concrete mix is too wet, it causes |
| A. | segregation |
| B. | low density |
| C. | excess laitance at the top |
| D. | all of these |
| Answer» D. all of these | |
| 412. |
The maximum quantity of aggregate per 50 kg of cement should not exceed |
| A. | 100 kg |
| B. | 200 kg |
| C. | 350 kg |
| D. | 450 kg |
| Answer» D. 450 kg | |
| 413. |
The presence of calcium chloride in water |
| A. | accelerates setting of cement |
| B. | accelerates hardening of cement |
| C. | causes little effect on quality of concrete |
| D. | all of these |
| Answer» A. accelerates setting of cement | |
| 414. |
The material used as an ingredient of concrete is usually |
| A. | cement |
| B. | aggregate |
| C. | water |
| D. | all of these |
| Answer» D. all of these | |
| 415. |
In flooring of building, prestressed cement concrete is commonly used. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 416. |
Le-chatelier apparatus is used to perform |
| A. | fineness test |
| B. | soundness test |
| C. | consistency test |
| D. | compressive strength test |
| Answer» B. soundness test | |
| 417. |
After the curing of 28 days, the concrete gains strength upto |
| A. | 40% |
| B. | 67% |
| C. | 100% |
| D. | 122% |
| Answer» C. 100% | |
| 418. |
The preliminary test is always conducted in the field. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 419. |
The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately |
| A. | 2 to 3 |
| B. | 3 to 4 |
| C. | 4 to 5 |
| D. | 5 to 6 |
| Answer» D. 5 to 6 | |
| 420. |
Fine sand bulks |
| A. | less |
| B. | more |
| Answer» B. more | |
| 421. |
The factor which effect the design of concrete mix is |
| A. | fineness modulus |
| B. | water-cement ratio |
| C. | slump |
| D. | all of these |
| Answer» D. all of these | |
| 422. |
The chemical ingredient of cement which provides quick setting property to the cement is |
| A. | lime |
| B. | silica |
| C. | alumina |
| D. | iron oxide |
| Answer» C. alumina | |
| 423. |
The workability of concrete by slump test is expressed as |
| A. | minutes |
| B. | mm / h |
| C. | mm2 / h |
| D. | mm |
| Answer» D. mm | |
| 424. |
Blast furnace slag cement concrete requires |
| A. | less |
| B. | more |
| Answer» B. more | |
| 425. |
For measuring aggregates by volume, wooden batch boxes known as farmas are used. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 426. |
The setting time of cement is the governing factor for |
| A. | mixing of concrete |
| B. | placing of concrete |
| C. | compaction of concrete |
| D. | all of these |
| Answer» D. all of these | |
| 427. |
Bulk 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» B. the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles | |
| 428. |
The finished concrete is measured in litres. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 429. |
In lime concrete, lime is used as |
| A. | coarse aggregate |
| B. | fine aggregate |
| C. | binding material |
| D. | admixture |
| Answer» C. binding material | |
| 430. |
In preliminary test, the concrete is placed in the mould in |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» B. three | |
| 431. |
To perform the initial setting time test, the water is added to the cement at the rate of |
| A. | 0.72 P |
| B. | 0.78 P |
| C. | 0.85 P |
| D. | 0.95 P |
| Answer» C. 0.85 P | |
| 432. |
Excess 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» D. causes bleeding in concrete | |
| 433. |
The minimum particle size of fine aggregate is |
| A. | 0.0075 mm |
| B. | 0.075 mm |
| C. | 0.75 mm |
| D. | 0.95 mm |
| Answer» B. 0.075 mm | |
| 434. |
To prevent segregation, the concrete should not be thrown from a height of more than |
| A. | 1/2 m |
| B. | 1 m |
| C. | 1.5 m |
| D. | 2 m |
| Answer» B. 1 m | |
| 435. |
The tricalcium aluminate in cement has the property of |
| A. | reacting fast with water |
| B. | causing initial setting of cement |
| C. | generating large amount of heat hydration |
| D. | all of these |
| Answer» D. all of these | |
| 436. |
The coarser the aggregate, the |
| A. | higher |
| B. | lower |
| Answer» A. higher | |
| 437. |
If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water-cement ratio is 0.6, the weight of water required for harsh mix is |
| A. | 8 kg |
| B. | 10 kg |
| C. | 12 kg |
| D. | 14 kg |
| Answer» C. 12 kg | |
| 438. |
The construction joints are generally provided in concrete |
| A. | roads |
| B. | retaining walls |
| C. | lining of tunnels |
| D. | all of these |
| Answer» D. all of these | |
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