Concrete Technology problems
- 1. On a grading curve, the gap grading is represented by
Options- A. a horizontal line
- B. a vertical line
- C. N.W. inclined line
- D. N.E. inclined line
- E. none of these. Discuss
Correct Answer: a horizontal line
- 2. The cement becomes useless if its absorbed moisture content exceeds
Options- A. 1%
- B. 2%
- C. 3%
- D. 4%
- E. 5% Discuss
Correct Answer: 5%
- 3. Pick up the incorrect statement from the following:
Options- A. With passage of time, the strength of cement increases
- B. With passage of time, the strength of cement decreases
- C. After a period of 24 months, the strength of cement reduces to 50%
- D. The concrete made with storage deteriorated cement, gains strength with time
- E. None of these. Discuss
Correct Answer: With passage of time, the strength of cement increases
- 4. Pick up the correct statement from the following:
Options- A. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
- B. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
- C. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
- D. The material having particles of size less than 0.002 mm, is known as clay
- E. All the above. Discuss
Correct Answer: All the above.
- 5. Placing of concrete should preferably be done at a temperature of
Options- A. 0°C
- B. 10°C
- C. 20°C
- D. 23°C
- E. 27 ± 2°C Discuss
Correct Answer: 27 ± 2°C
- 6. The main object of compaction of concrete, is:
Options- A. to eliminate air holes
- B. to achieve maximum density
- C. to provide initimate contact between the concrete and embedded materials
- D. all the above. Discuss
Correct Answer: all the above.
- 7. For given workability the grading requiring the least amount of water is one that gives
Options- A. greatest surface area for the given cement and aggregates
- B. least surface area for the given cement and aggregates
- C. least weight for the given cement and aggregates
- D. greatest weight for the given cement and aggregates
- E. none of these. Discuss
Correct Answer: greatest surface area for the given cement and aggregates
- 8. Particles of 0.002 mm size are that of
Options- A. clay
- B. sand
- C. gravel
- D. none of these. Discuss
Correct Answer: clay
- 9. 1.S.I. has specified the full strength of concrete after
Options- A. 7 days
- B. 14 days
- C. 21 days
- D. 28 days
- E. 35 days Discuss
Correct Answer: 28 days
- 10. The bulk density of aggregates, depends upon
Options- A. shape
- B. grading
- C. compaction
- D. all the above. Discuss
Correct Answer: all the above.
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