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- Question
Efflorescence in cement is caused due to an excess of
Options- A. alumina
- B. iron oxide
- C. silica
- D. alkalis
- E. magnesium oxide.
- Correct Answer
- alkalis
- 1. The most useless aggregate is one whose surface texture is
Options- A. smooth
- B. granular
- C. glassy
- D. honey combed and porous. Discuss
- 2. Pick up the correct statement from the following:
Options- A. Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones
- B. Concrete using sand stones, cracks due to excessive shrinkage
- C. Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength
- D. Broken bricks produce a concrete having good fire resisting qualities
- E. All the above. Discuss
- 3. Pozzolana cement is used with confidence for construction of
Options- A. dams
- B. massive foundations
- C. abutments
- D. R.C.C. structures
- E. all the above. Discuss
- 4. Pick up the incorrect statement applicable to the field test of good cement.
Options- A. When one thrusts one's hand into a bag of cement, one should feel warm
- B. The colour of the cement is bluish
- C. A handful of cement thrown into a bucket of water should sink immediately
- D. By rubbing cement in between fingers, one should feed rough
- E. All the above. Discuss
- 5. 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
- 6. The shrinkage of concrete
Options- A. is proportional to water content is the mix
- B. is proportional to cement concrete
- C. increases with age of concrete
- D. all the above. Discuss
- 7. The diameter of the Vicat plunger is 10 mm and its length varies from
Options- A. 20 mm to 30 mm
- B. 30 mm to 40 mm
- C. 40 mm to 50 mm
- D. 50 mm to 60 mm
- E. none of these. Discuss
- 8. Allowable shear strength of concrete, depends upon
Options- A. shear strength
- B. tensile strength
- C. compressive strength
- D. none of these. Discuss
- 9. While designing an air entrained concrete
Options- A. water cement ratio is reduced
- B. proportion of aggregates is reduced
- C. an allowance for the entrained air is made
- D. strength of the concrete, is reduced
- E. all the above. Discuss
- 10. Concrete containing
Options- A. silicious aggregates, has higher co-efficient of expansion
- B. igneous aggregates, has intermediate coefficient of expansion
- C. lime stones, has lowest co-efficient of expansion
- D. All the above. Discuss
Concrete Technology problems
Search Results
Correct Answer: glassy
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: 200 kg/cm2
Correct Answer: all the above.
Correct Answer: 40 mm to 50 mm
Correct Answer: shear strength
Correct Answer: all the above.
Correct Answer: All the above.
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