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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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