Concrete Technology problems
- 1. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is
Options- A. 30%
- B. 40%
- C. 50%
- D. 60%
- E. 70% Discuss
Correct Answer: 30%
- 2. Separation of coarse aggregates from mortar during transportation, is known
Options- A. bleeding
- B. creeping
- C. segregation
- D. shrinkage
- E. none of these. Discuss
Correct Answer: segregation
- 3. Pick up the incorrect statement from the following:
Options- A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
- B. The strength of concrete decreases as the water cement ratio increases
- C. If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure
- D. Good compaction by mechanical vibrtions, increases the strength of concrete
- E. None of these. Discuss
Correct Answer: A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
- 4. The process of hardening the concrete by keeping its surface moist is known
Options- A. placing
- B. wetting
- C. curing
- D. compacting
- E. none of these. Discuss
Correct Answer: curing
- 5. The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are
Options- A. 1500 bags
- B. 2000 bags
- C. 2500 bags
- D. 3000 bags
- E. 4000 bags Discuss
Correct Answer: 3000 bags
- 6. Pick up the incorrect statement from the following:
Options- A. The degree of grinding of cement, is called fineness
- B. The process of changing cement paste into hard mass, is known as setting of cement
- C. The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
- D. The heat generated during chemical reaction of cement with water, is known as heat of hydration
- E. None of these. Discuss
Correct Answer: The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
- 7. The light weight aggregates are obtained from
Options- A. sedimentary rocks
- B. metamorphic rocks
- C. igneous rocks
- D. volcanic source. Discuss
Correct Answer: volcanic source.
- 8. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is
Options- A. 1 : 2 : 4
- B. 1 : 3 : 6
- C. 1 :
: 3 - D. 1 : 1 : 2
- E. 4 : 2 : 1 Discuss
Correct Answer: 1 :
: 3 - 9. 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
- 10. 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
Correct Answer: All the above.
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