Concrete Technology problems
- 1. ISI has specified full strength of concrete after
Options- A. 7 days
- B. 14 days
- C. 21 days
- D. 28 days
- E. none of these. Discuss
Correct Answer: none of these.
- 2. Pick up the correct statement from the following:
Options- A. Construction joints are necessarily planned for their locations
- B. Expansion joints are provided to accommodate thermal expansion
- C. Construction joints are provided to control shrinkage cracks
- D. Expansion joints need not be provided in foundation concrete
- E. All the above. Discuss
Correct Answer: All the above.
- 3. A construction joint is provided where
Options- A. bending moment is small
- B. shear force is small
- C. the member is supported by other member
- D. all the above. Discuss
Correct Answer: all the above.
- 4. 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
Correct Answer: none of these.
- 5. Batching error means inaccuracy in the quantity of
Options- A. aggregates
- B. cement
- C. water
- D. all the above. Discuss
Correct Answer: all the above.
- 6. 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
Correct Answer: 25 cm
- 7. 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
Correct Answer: all the above.
- 8. 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
Correct Answer: All the above.
- 9. Too wet concrete may cause
Options- A. weakness of concrete
- B. excessive laitance
- C. segregation
- D. lower density
- E. all the above. Discuss
Correct Answer: all the above.
- 10. 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
Correct Answer: All the above.
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