Concrete Technology problems
- 1. Pick up the correct statement from the following:
Options- A. An increase in water content must be accompanied by an increase in cement content
- B. Angular and rough aggregates reduce the workability of the concrete
- C. Large size aggregates increase the workability due to lesser surface area
- D. The slump of the concrete mix decreases due to an increase in temperature
- E. All the above. Discuss
Correct Answer: All the above.
- 2. The top diameter, bottom diameter and the height of a slump mould are :
Options- A. 10 cm, 20 cm, 30 cm
- B. 10 cm, 30 cm, 20 cm
- C. 20 cm, 10 cm, 30 cm
- D. 20 cm, 30 cm, 10 cm
- E. 30 cm, 20 cm, 10 cm Discuss
Correct Answer: 10 cm, 20 cm, 30 cm
- 3. For concreting tunnel linings, tran-portation of concrete is done by
Options- A. pans
- B. wheel borrows
- C. containers
- D. pumps
- E. belt conveyors. Discuss
Correct Answer: pumps
- 4. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as
Options- A. low-heat Portland cement
- B. rapid hardening Portland cement
- C. Portland blast slag cement
- D. Portland pozzolana cement
- E. none of these. Discuss
Correct Answer: low-heat Portland cement
- 5. Saw dust can be rendered chemically inert by boiling it in water containing
Options- A. ferrous sulphate
- B. potassium chloride
- C. ammonia
- D. nitric acid
- E. sulphuric acid. Discuss
Correct Answer: ferrous sulphate
- 6. The operation of removing humps and hollows of uniform concrete surface, is known as
Options- A. floating
- B. screeding
- C. trowelling
- D. finishing
- E. none of these. Discuss
Correct Answer: screeding
- 7. Pick up the correct statement from the following:
Options- A. Water enables chemical reaction to take place with cement
- B. Water lubricates the mixture of gravel, sand and cement
- C. Only a small quantity of water is required for hydration of cement
- D. Strength of concrete structure largely depends upon its workability
- E. All the above. Discuss
Correct Answer: All the above.
- 8. The aggregate containing moisture in pores and having its suface dry, is known as
Options- A. moist aggregates
- B. very dry aggregates
- C. dry aggregates
- D. saturated surface dry aggregate
- E. none of these. Discuss
Correct Answer: saturated surface dry aggregate
- 9. The commercial name of white and coloured cement in India, is
Options- A. colocrete
- B. rainbow cement
- C. silvicrete
- D. snowcem
- E. all the above. Discuss
Correct Answer: all the above.
- 10. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed
Options- A. 10 cm
- B. 15 cm
- C. 20 cm
- D. 25 cm
- E. 30 cm Discuss
Correct Answer: 20 cm
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