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- Question
The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
Options- A. 100 kg/cm2
- B. 150 kg/cm2
- C. 200 kg/cm2
- D. 250 kg/cm2
- E. 300 kg/cm2
- Correct Answer
- 150 kg/cm2
- 1. The type of aggregates of same nominal size, which contain less voids when compacted, are
Options- A. rounded spherical
- B. irregular
- C. flaky
- D. none of these. Discuss
- 2. High temperature
Options- A. increases the strength of concrete
- B. decreases the strength of concrete
- C. has no effect on the strength of concrete
- D. none of these. Discuss
- 3. For preparing a test-specimen, it is necessary
Options- A. to mix cement and fine aggregate by dry hand
- B. to mix coarse aggregates
- C. to mix water to the cement, fine aggregates and coarse aggregates
- D. to oil inner surface of the mould and the base plate, before placing concrete
- E. all the above. Discuss
- 4. Pick up the incorrect statement from the following:
Options- A. In properly graded aggregates, bulk density is more
- B. In single size aggregates, bulk density is least
- C. In single size aggregates, bulk density is maximum
- D. None of these. Discuss
- 5. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
Options- A. rounded aggregate
- B. irregular aggregate
- C. angular aggregate
- D. flaky aggregate
- E. none of these. Discuss
- 6. Slump test of concrete is a meausre ofits
Options- A. consistency
- B. compressive strength
- C. tensile strength
- D. impact value. Discuss
- 7. The bulk density of aggregates, is generally expressed as
Options- A. tonnes/cubic metre
- B. kg/cubic metre
- C. kg/litre
- D. g/cm3
- E. none of these. Discuss
- 8. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is
Options- A. 15, 900 litres
- B. 16, 900 litres
- C. 17, 900 litres
- D. 18, 900 litres Discuss
- 9. Joints in concrete structures, are provided
Options- A. to reduce the tensile stresses likely to be developed due to evaporation of water
- B. to minimise the change in the dimensions of the slab
- C. to minimise the necessary cracking
- D. all the above. Discuss
- 10. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
Options- A. 30 minutes
- B. 40 minutes
- C. 60 minutes
- D. 75 minutes
- E. 90 minutes. Discuss
Concrete Technology problems
Search Results
Correct Answer: rounded spherical
Correct Answer: decreases the strength of concrete
Correct Answer: all the above.
Correct Answer: In single size aggregates, bulk density is maximum
Correct Answer: rounded aggregate
Correct Answer: consistency
Correct Answer: kg/litre
Correct Answer: 18, 900 litres
Correct Answer: all the above.
Correct Answer: 30 minutes
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