2. If the slump of concrete mix is 70 mm, its workability is considered to be
Correct : C. medium
3. The prestressed cement concrete can take up high tensile and compressive stresses without development of cracks.
Correct : A. Correct
4. The gypsum is added to the cement for
Correct : B. controlling the initial setting time of cement
5. The degree of grinding of cement is called
Correct : A. fineness
6. In performing preliminary test
Correct : D. all of the above
7. 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.
Correct : A. Correct
8. Water cannot be used as a lubricant in concrete mix.
Correct : B. False
9. The ordinary concrete is no used for
Correct : D. M 40
10. Smaller size aggregates require less quantity of water for lubrication.
Correct : B. No
11. When the concrete mix is too wet, it causes
Correct : D. all of these
12. The maximum quantity of aggregate per 50 kg of cement should not exceed
Correct : D. 450 kg
13. The presence of calcium chloride in water
Correct : A. accelerates setting of cement
14. The material used as an ingredient of concrete is usually
Correct : D. all of these
15. In flooring of building, prestressed cement concrete is commonly used.
Correct : B. Wrong
16. Le-chatelier apparatus is used to perform
Correct : B. soundness test
17. After the curing of 28 days, the concrete gains strength upto
Correct : C. 100%
18. The preliminary test is always conducted in the field.
Correct : B. Disagree
19. The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately
Correct : D. 5 to 6
20. Fine sand bulks
Correct : B. more
21. The factor which effect the design of concrete mix is
Correct : D. all of these
22. The chemical ingredient of cement which provides quick setting property to the cement is
Correct : C. alumina
23. The workability of concrete by slump test is expressed as
Correct : D. mm
24. Blast furnace slag cement concrete requires
Correct : B. more
25. For measuring aggregates by volume, wooden batch boxes known as farmas are used.
Correct : A. Correct
26. The setting time of cement is the governing factor for
Correct : D. all of these
27. Bulk specific gravity of an aggregate is defined as
Correct : B. the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
28. The finished concrete is measured in litres.
Correct : B. Wrong
29. In lime concrete, lime is used as
Correct : C. binding material
30. In preliminary test, the concrete is placed in the mould in
Correct : B. three
31. To perform the initial setting time test, the water is added to the cement at the rate of
Correct : C. 0.85 P
32. Excess quantity of water
Correct : D. causes bleeding in concrete
33. The minimum particle size of fine aggregate is
Correct : B. 0.075 mm
34. To prevent segregation, the concrete should not be thrown from a height of more than
Correct : B. 1 m
35. The tricalcium aluminate in cement has the property of
Correct : D. all of these
36. The coarser the aggregate, the
Correct : A. higher
37. 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
Correct : C. 12 kg
38. The construction joints are generally provided in concrete