Concrete Technology problems
- 1. For road pavements, the cement generally used, is
Options- A. ordinary Portland cement
- B. rapid hardening cement
- C. low heat cement
- D. blast furnace slag cement
- E. none of these. Discuss
Correct Answer: rapid hardening cement
- 2. Pick up the correct proportions of chemical ingredients of cement
Options- A. Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
- B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
- C. Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
- D. Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3 Discuss
Correct Answer: Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
- 3. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is
Options- A.
- B.
- C.
- D.
- E.
Discuss
Correct Answer:
- 4. The bulk density of aggregates does not depend upon :
Options- A. size and shape of aggregates
- B. specific gravity of aggregates
- C. grading of aggregates
- D. size and shape of the container
- E. none of these. Discuss
Correct Answer: size and shape of the container
- 5. After casting, an ordinary cement concrete on drying
Options- A. expands
- B. mix
- C. shrinks
- D. none of these. Discuss
Correct Answer: shrinks
- 6. The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
Options- A. 5 kg/cm2
- B. 8 kg/cm2
- C. 10 kg/cm2
- D. 12 kg/cm2
- E. 15 kg/cm2 Discuss
Correct Answer: 15 kg/cm2
- 7. According to I.S. : 456, the number of grades of concrete mixes, is
Options- A. 3
- B. 4
- C. 5
- D. 6
- E. 7 Discuss
Correct Answer: 7
- 8. Workability of concrete is measured by
Options- A. Vicat apparatus test
- B. Slump test
- C. Minimum void method
- D. Talbot Richard test. Discuss
Correct Answer: Slump test
- 9. Pick up the correct statement from the following:
Options- A. Bulking of sand is caused due to formation of a thin film of surface moisture
- B. Fine sand bulks more than coarse sand
- C. With 10% moisture content by weight, the bulking of sand is increased by 50%.
- D. The volume of fully saturated sand, is equal to the volume of dry and loose sand
- E. All the above. Discuss
Correct Answer: All the above.
- 10. Pick up the correct statement from the following:
Options- A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
- B. The total water is the free water and the amount actually absorbed by the aggregates
- C. Neither (a) nor (b)
- D. Both (a) and (b). Discuss
Correct Answer: Both (a) and (b).
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