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- Question
Too wet concrete may cause
Options- A. weakness of concrete
- B. excessive laitance
- C. segregation
- D. lower density
- E. all the above.
- Correct Answer
- all the above.
- 1. Pick up the correct statement from the following:
Options- A. Water cement paste hardens due to hydration
- B. During hardening cement binds the aggregates together
- C. Cement provides strength, durability and water tightness to the concrete
- D. All the above. Discuss
- 2. Addition of pozzolana to cement causes
Options- A. reduction in permeability
- B. loss of heat of hydration
- C. reduction in bleeding
- D. increase in curing time
- E. all the above. Discuss
- 3. The maximum thickness of concrete floor of a cement warehouse, is
Options- A. 10 cm
- B. 15 cm
- C. 20 cm
- D. 25 cm
- E. 30 cm Discuss
- 4. Batching error means inaccuracy in the quantity of
Options- A. aggregates
- B. cement
- C. water
- D. all the above. Discuss
- 5. Hardening of cement occurs at
Options- A. rapid rate during the first few days and afterwards it continues to increase at a decreased rate
- B. slow rate during the first few days and afterwards it continues to increase at a rapid rate
- C. uniform rate throughout its age
- D. none of these. Discuss
- 6. Pick up the correct statement from the following:
Options- A. Lime in excess, causes the cement to expand and disintegrate
- B. Silica in excess, causes the cement to set slowly
- C. Alumina in excess, reduces the strength of the cement
- D. Magnesium oxide in excess, remains in free state and makes the cement unsound
- E. All the above. Discuss
- 7. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is
Options- A. 30%
- B. 40%
- C. 50%
- D. 60%
- E. 70% Discuss
- 8. Separation of coarse aggregates from mortar during transportation, is known
Options- A. bleeding
- B. creeping
- C. segregation
- D. shrinkage
- E. none of these. Discuss
- 9. Pick up the incorrect statement from the following:
Options- A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
- B. The strength of concrete decreases as the water cement ratio increases
- C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure
- D. Good compaction by mechanical vibrtions, increases the strength of concrete
- E. None of these. Discuss
- 10. The process of hardening the concrete by keeping its surface moist is known
Options- A. placing
- B. wetting
- C. curing
- D. compacting
- E. none of these. Discuss
Concrete Technology problems
Search Results
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: 25 cm
Correct Answer: all the above.
Correct Answer: none of these.
Correct Answer: All the above.
Correct Answer: 30%
Correct Answer: segregation
Correct Answer: A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
Correct Answer: curing
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