Concrete Technology problems
- 1. For an ordinary Portland cement
Options- A. residual does not exceed 10% when sieved through IS Sieve No. 9
- B. soundness varies from 5 to 10 mm
- C. initial setting time is not less than 30 minutes
- D. compressive stress after 7 days, is not less than 175 kg/cm2
- E. all the above. Discuss
Correct Answer: initial setting time is not less than 30 minutes
- 2. Workability of concrete for a given water content is good if the aggregates, are
Options- A. rounded aggregate
- B. irregular aggregate
- C. angular aggregate
- D. flaky aggregates. Discuss
Correct Answer: rounded aggregate
- 3. 1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of
Options- A. coarse aggregates
- B. fine aggregates
- C. neither (a) nor (b)
- D. both (a) and (b)
- E. none of these. Discuss
Correct Answer: both (a) and (b)
- 4. You are asked to construct a massive dam, the type of cement you will use, is
Options- A. ordinary Portland cement
- B. rapid hardening cement
- C. low heat cement
- D. blast furnace slag cement
- E. white cement. Discuss
Correct Answer: low heat cement
- 5. Pick up the correct statement from the following:
Options- A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight
- B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky
- C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous
- D. All the above. Discuss
Correct Answer: All the above.
- 6. Ordinary concrete is not used for concrete grade
Options- A. M 100
- B. M 150
- C. M 200
- D. M 250
- E. M 400 Discuss
Correct Answer: M 400
- 7. Grading of sand causes great variation in
Options- A. workability of concrete
- B. strength of concrete
- C. durability of concrete
- D. handing and placing of concrete
- E. all the above. Discuss
Correct Answer: all the above.
- 8. Pick up the correct statement from the following:
Options- A. Segregation is necessary for a workable concrete
- B. Consistency does not affect the workability of concrete
- C. If the slump increases, workability decreases
- D. If the concrete mix is dry, the slump is maximum
- E. None of these. Discuss
Correct Answer: None of these.
- 9. Shrinkage in concrete can be reduced by using
Options- A. low water cement ratio
- B. less cement in the concrete
- C. proper concrete mix
- D. presaturated aggregates
- E. all the above. Discuss
Correct Answer: all the above.
- 10. Pick up the correct statement from the following i.
Options- A. Higher workability indicates unexpected increase in the moisture content
- B. Higher workability indicates deficiency of sand
- C. If the concrete mix is dry, the slump is zero
- D. Concrete mix having zero slump, is unsuitable for high strength.
- E. All the above. Discuss
Correct Answer: All the above.
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