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Bleeding can be controlled by:
a. Adding cement
b. More vibrating concrete
c. Adding aggregates
d. Adding fresh concrete
January 2, 2025 at 3:48 AM
28. On relation to the use of air-entraining agents in concrete, which of the following statements are true?
a. Improve the workability
b. Improving long-term durability
c. Makes a less dense mixture
d. All of the above
December 30, 2024 at 4:01 AM
27. What factors influence the compressive strength of concrete?
1. Resistance is inversely proportional to the water-cement ratio
2. The resistance is proportional at the cement content
3. Cracks appears on the surface due to excessive water content
4. All of the above
December 28, 2024 at 4:25 AM
26. Air-Entrained concrete is used to ……
Freeze thaw resistance
Freeze thaw non resistance
None of these
December 27, 2024 at 7:11 AM
25. Why steel is preferred as reinforcement in concretw?
1. Because it is inexpensive and resistant
2. Because it is easily accessible
3. Becaus it adheres well to concrete
4. Becaus it has the same coefficient of expansion of the concrete
(All are right, choose the best answer)
December 26, 2024 at 3:52 AM
24. Asbestos cement ?
a. Is brittle
b. Warps due to changes in humidity
c. Strength is lowered when saturated by water.
d. All of the above.
December 24, 2024 at 2:53 PM
23. For the manufacture of Portland cement, the proportions of raw materials used are ?
a.  Lime63%; silica 22%; other ingredients15%
b.   Lime22%; silica 63%; other ingredients 15%
c.   Silica 40%; lime40%; other ingredients 20%
d.   Silica 70%; lime20%; other ingredients 10%.
December 23, 2024 at 5:14 AM
22. In the cement the compound quickest to react with water is ?
a. Tri calcium aluminate.
b. Tetra-calcium alumina-ferrite.
c. Tri- calcium silicate.
d. Di- calcium silicates
December 22, 2024 at 3:39 AM
21. Ultimate strength to cement is provided by ?
a. Tri calcium silicate.
b. Di-calcium silicate.
c. Tri-calcium aluminate.
d. Tetra calcium alumina ferrite.
December 21, 2024 at 3:35 AM
20. What is concrete density ?
a. 2.4
b. 3.0
c. 2.7
d. None of the above
December 20, 2024 at 7:23 AM
19. What is poison’s ratio for normal concrete ?
a. 0.2
b. 0.3
c. 0.4
d. 0.5
December 19, 2024 at 3:34 AM
18. What is the meaning of concrete hydration ? choose the best answer
a. The reaction between cement & water
b. Curing of concrete
c. Setting of concrete
d. All of the above
December 18, 2024 at 8:28 AM
17. Consider the following statements: Shrinkage of concrete depends on ?
1. Relative humidity of the atmosphere
2. Passage of time
3. Applied stress
4. Choose the answer
a. 1 & 2
b. 2 & 3
c. 1, 2 & 3
d. 3
December 17, 2024 at 3:37 AM
16. Ultra – Sonic testing of concrete is ?
1. Non-Destructive test
2. Used on smooth concrete surfaces
3. A destructive test
4. Used for soil testing Choose the answer
a. 1 & 2
b. 3 only
c. 3 & 4
d. All of the above
December 16, 2024 at 3:24 AM