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- Question
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.
- Correct Answer
- plastic
- 1. 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
- 2. 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). Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. Pick up the correct statement from the following:
Options- A. Continuous grading is not necessary for obtaining a minimum of air voids
- B. The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
- C. The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
- D. All the above. Discuss
- 10. 'Ware house pack' of cement means
Options- A. full capacity of the ware house
- B. pressure exertion of the bags of upper layers
- C. pressure compaction of the bags on lower layers
- D. packing the ware house
- E. none of these. Discuss
Concrete Technology problems
Search Results
Correct Answer: magnesium oxide
Correct Answer: Construction joint
Correct Answer: 14 kg
Correct Answer: ponding method
Correct Answer: All the above.
Correct Answer: All the above.
Correct Answer: is more plastic and workable
Correct Answer: sea beds
Correct Answer: All the above.
Correct Answer: pressure compaction of the bags on lower layers
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