Concrete Technology problems
- 1. Pozzolana cement is used with confidence for construction of
Options- A. dams
- B. massive foundations
- C. abutments
- D. R.C.C. structures
- E. all the above. Discuss
Correct Answer: all the above.
- 2. Pick up the correct statement from the following:
Options- A. Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones
- B. Concrete using sand stones, cracks due to excessive shrinkage
- C. Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength
- D. Broken bricks produce a concrete having good fire resisting qualities
- E. All the above. Discuss
Correct Answer: All the above.
- 3. The most useless aggregate is one whose surface texture is
Options- A. smooth
- B. granular
- C. glassy
- D. honey combed and porous. Discuss
Correct Answer: glassy
- 4. Efflorescence in cement is caused due to an excess of
Options- A. alumina
- B. iron oxide
- C. silica
- D. alkalis
- E. magnesium oxide. Discuss
Correct Answer: alkalis
- 5. The shrinkage of concrete
Options- A. is proportional to water content is the mix
- B. is proportional to cement concrete
- C. increases with age of concrete
- D. all the above. Discuss
Correct Answer: all the above.
- 6. The diameter of the Vicat plunger is 10 mm and its length varies from
Options- A. 20 mm to 30 mm
- B. 30 mm to 40 mm
- C. 40 mm to 50 mm
- D. 50 mm to 60 mm
- E. none of these. Discuss
Correct Answer: 40 mm to 50 mm
- 7. Allowable shear strength of concrete, depends upon
Options- A. shear strength
- B. tensile strength
- C. compressive strength
- D. none of these. Discuss
Correct Answer: shear strength
- 8. While designing an air entrained concrete
Options- A. water cement ratio is reduced
- B. proportion of aggregates is reduced
- C. an allowance for the entrained air is made
- D. strength of the concrete, is reduced
- E. all the above. Discuss
Correct Answer: all the above.
- 9. Concrete containing
Options- A. silicious aggregates, has higher co-efficient of expansion
- B. igneous aggregates, has intermediate coefficient of expansion
- C. lime stones, has lowest co-efficient of expansion
- D. All the above. Discuss
Correct Answer: All the above.
- 10. According to Water-Cement Ratio Law, the strength of workable plastic concrete
Options- A. depends upon the amount of water used in the mix
- B. does not depend upon the quality of cement mixed with aggregates
- C. does not depend upon the quanity of cement mixed with aggregates
- D. all the above. Discuss
Correct Answer: all the above.
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