Concrete Technology problems
- 1. Cement used for normal concrete construction, is obtained by burning a mixture of
Options- A. silicious and argillaceous materials
- B. argilaceous and calcareous materials
- C. silicious and catcareous materials
- D. silicious, argillaceous and calcareous materials
- E. none of these. Discuss
Correct Answer: silicious, argillaceous and calcareous materials
- 2. Permissible compressive strength of M 200 concrete grade is
Options- A. 100 kg/cm2
- B. 150 kg/cm2
- C. 200 kg/cm2
- D. 250 kg/cm2
- E. 300 kg/cm2 Discuss
Correct Answer: 200 kg/cm2
- 3. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
Options- A. between 150 to 300 kg/cm2
- B. between 350 to 600 kg/cm2
- C. between 150 to 500 kg/cm2
- D. below 200 kg/cm2
- E. none of these. Discuss
Correct Answer: below 200 kg/cm2
- 4. Strength of concrete with passage of time
Options- A. increases
- B. decreases
- C. fluctuates
- D. remains constant. Discuss
Correct Answer: increases
- 5. Setting time of cement increases by adding
Options- A. gypsum
- B. hydrogen peroxide
- C. calcium chloride
- D. sodium oxide
- E. none of these. Discuss
Correct Answer: gypsum
- 6. A flaky aggregate is said to be elongated if its length is
Options- A. equal to the mean size
- B. twice the mean size
- C. thrice the mean size
- D. four times the mean size
- E. five times the mean size. Discuss
Correct Answer: twice the mean size
- 7. Higher workability of concrete is required if the structure is
Options- A. made with cement concrete
- B. thick and reinfored
- C. thin and heavily reinforced
- D. thick and heavily reinfored. Discuss
Correct Answer: thick and heavily reinfored.
- 8. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
Options- A. 0.1P + 0.3Y + 0.1Z = W/C x P
- B. 0.3P + 0.1Y + 0.01Z = W/C x P
- C. 0.4P + 0.2Y + 0.01Z = W/C x P
- D. 0.5P + 0.3Y + 0.01Z = W/C x P
- E. 0.2P + 0.5Y + 0.1Z = W/C x P Discuss
Correct Answer: 0.3P + 0.1Y + 0.01Z = W/C x P
- 9. Expansion joints are provided if the length of concrete structures exceeds
Options- A. 10 m
- B. 15 m
- C. 15 m
- D. 35 m
- E. 45 m Discuss
Correct Answer: 45 m
- 10. According to IS : 382-1963, a good aggregate should be
Options- A. chemically inert
- B. sufficiently strong
- C. hard and durable
- D. all the above. Discuss
Correct Answer: all the above.
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