Concrete Technology problems
- 1. Concrete gains strength due to
Options- A. chemical reaction of cement with sand and coarse aggregates
- B. evaporation of water from concrete
- C. hydration of cement
- D. All the above. Discuss
Correct Answer: hydration of cement
- 2. If the slump of a concrete mix is 60 mm, its workability is
Options- A. very low
- B. low
- C. medium
- D. high
- E. none of these. Discuss
Correct Answer: medium
- 3. Water cement ratio is generally expressed in volume of water required per
Options- A. 10 kg
- B. 20 kg
- C. 30 kg
- D. 40 kg
- E. 50 kg Discuss
Correct Answer: 50 kg
- 4. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
Options- A. 20 times
- B. 25 times
- C. 30 times
- D. 40 times
- E. 50 times Discuss
Correct Answer: 25 times
- 5. Pick up the correct statement from the following:
Options- A. Sand obtained from pits, is washed to remove clay and silt
- B. Sand obtained from flooded pits, need not be washed before use
- C. Sea shore sand contains chlorides which cause effloresance
- D. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
- E. All the above. Discuss
Correct Answer: All the above.
- 6. The shuttering of a hall measuring 4 m x 5 m, can be removed after
Options- A. 5 days
- B. 7 days
- C. 10 days
- D. 14 days
- E. 21 days Discuss
Correct Answer: 7 days
- 7. Log Angles machine is used to test the aggregate for
Options- A. crushing strength
- B. impact value
- C. abrasion resistance
- D. water absorption
- E. none of these. Discuss
Correct Answer: abrasion resistance
- 8. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is
Options- A. 2000 bags
- B. 2200 bags
- C. 2400 bags
- D. 2700 bags
- E. 3000 bags Discuss
Correct Answer: 2700 bags
- 9. To prevent segregation, the maximum height for placing concrete, is
Options- A. 100 cm
- B. 125 cm
- C. 150 cm
- D. 200 cm
- E. 250 cm Discuss
Correct Answer: 100 cm
- 10. For a good concrete
Options- A. aggregates should be hard and durable
- B. cement should be sufficient to produce the required strength
- C. water should be free from organic materials
- D. mixing of ingredients should be done thoroughly so as to produce homogeneity
- E. All the above. Discuss
Correct Answer: All the above.
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