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Concrete Technology
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Question
Pick up the incorrect statement from the following:
Options
A. Admixtures accelerate hydration
B. Admixtures make concrete water proof
C. Admixtures make concrete acid proof
D. Admixtures give high strength
E. None of these.
Correct Answer
Admixtures accelerate hydration
Concrete Technology problems
Search Results
1. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
Options
A. M 100
B. M 150
C. M 200
D. M 250
E. M 300
Show Answer
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Correct Answer: M 100
2. Gypsum is added for
Options
A. colour
B. strength
C. controlling setting time
D. none of these.
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Correct Answer: controlling setting time
3. An ideal ware house, is provided
Options
A. water proof masonry walls
B. water proof roof
C. few windows which remain generally closed
D. 15 cm thick concrete floor laid on a dry course of soling
E. all the above.
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Correct Answer: all the above.
4. Sand requiring a high water cement ratio, belongs to
Options
A. Zone I
B. Zone II
C. Zone III
D. Zone IV.
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Correct Answer: Zone I
5. Pick up the incorrect statement from the following:
Options
A. Tricalcium silicate (C
3
S) hydrates rapidly
B. Tricalcium silicate (C
3
S) generates more heat of hydration
C. Tricalcium silicate (C
3
S) develops early strength
D. Tricalcium silicate (C
3
S) has more resistance to sulphate attack
E. None of these.
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Correct Answer: Tricalcium silicate (C
3
S) has more resistance to sulphate attack
6. Non-uniform compaction may cause the concrete
Options
A. porous
B. non-homogeneous
C. reduced strength
D. all the above.
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Correct Answer: all the above.
7. The entrained air in concrete
Options
A. increases workability
B. decreases workability
C. decreases resistance to weathering
D. increases strength
E. neither affects workability nor strength.
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Correct Answer: increases workability
8. A concrete having a slump of 6.5 cm, is said to be
Options
A. dry
B. earth moist
C. semi-plastic
D. plastic
E. none of these.
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Correct Answer: plastic
9. Pick up the incorrect statement from the following. While performing preliminary test on concrete
Options
A. proportions of the material and water should be the same as to be used at the work site
B. cement should be mixed by hand in order to maintain uniformity
C. concrete mix should be stored in air-tight containers
D. concrete ingredients should be kept at a temperature of 37° ± 2°C
E. none of these.
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Correct Answer: concrete ingredients should be kept at a temperature of 37° ± 2°C
10. For preparing ordinary concrete, the quantity of water used, is
Options
A. 5% by weight of aggregates plus 20% of weight of cement
B. 10% by weight of aggregates plus 10% of weight of cement
C. 5% by weight of aggregates plus 30% of weight of cement
D. 30% by weight of aggregates plus 10% of weight of cement
E. none of these.
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Correct Answer: 5% by weight of aggregates plus 30% of weight of cement
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