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- Question
The surface where two successive placements of concrete meet, is known as
Options- A. Contraction joint
- B. Expansion joint
- C. Construction joint
- D. both (a) and (b)
- E. both (6) and (c).
- Correct Answer
- Construction joint
- 1. For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is
Options- A. 10 kg
- B. 12 kg
- C. 14 kg
- D. 16 kg
- E. 20 kg Discuss
- 2. Curing of pavements, floors, roofs and slabs, is done by
Options- A. membrane method
- B. ponding method
- C. covering surface with bags
- D. sprinkling water method
- E. shading concrete method. Discuss
- 3. In the method of voids for determination of the quantity of cement paste, it is assumed that
Options- A. Voids in coarse aggregates are filled by fine aggregates
- B. Voids in fine aggregates are filled by the cement paste
- C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
- D. Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
- E. All the above. Discuss
- 4. An aggregate is known as cyclopean aggregate if its size is more than
Options- A. 4.75 mm
- B. 30 mm
- C. 60 mm
- D. 75 mm
- E. 90 mm. Discuss
- 5. An excess of flaky particles in concrete aggregates
Options- A. decreases the workability
- B. increases the quantity of water and sand
- C. affects the durability of concrete
- D. more than 15% are not desirable
- E. all the above. Discuss
- 6. The minimum percentage of chemical ingredient of cement is that of
Options- A. magnesium oxide
- B. iron oxide
- C. alumina
- D. lime
- E. silica. Discuss
- 7. Concrete is unsuitable for compaction by a vibrator if it is
Options- A. dry
- B. earth moist
- C. semi-plastic
- D. plastic
- E. none of these. Discuss
- 8. Pick up the correct statement from the following:
Options- A. The quality of water governs the strength of concrete
- B. The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction
- C. 10% excess of water reduces the strength of concrete by 15%
- D. 30% excess of water reduces the strength of concrete by 50%
- E. All the above. Discuss
- 9. A concrete using an air entrained cement
Options- A. has strength less than 10% to 15%
- B. has more resistance to weathering
- C. is more plastic and workable
- D. is free from segregation and bleeding
- E. all the above. Discuss
- 10. Sand generally contains salt if it is obtained from:
Options- A. nala beds
- B. river beds
- C. sea beds
- D. all the above
- E. none of these. Discuss
Concrete Technology problems
Search Results
Correct Answer: 14 kg
Correct Answer: ponding method
Correct Answer: All the above.
Correct Answer: 75 mm
Correct Answer: all the above.
Correct Answer: magnesium oxide
Correct Answer: plastic
Correct Answer: All the above.
Correct Answer: is more plastic and workable
Correct Answer: sea beds
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