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Concrete Technology
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Question
The most useless aggregate is one whose surface texture is
Options
A. smooth
B. granular
C. glassy
D. honey combed and porous.
Correct Answer
glassy
Concrete Technology problems
Search Results
1. 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.
Show Answer
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Discuss
Correct Answer: All the above.
2. 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.
Show Answer
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Discuss
Correct Answer: all the above.
3. 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.
Show Answer
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Discuss
Correct Answer: All the above.
4. Permissible compressive strength of M 200 concrete grade is
Options
A. 100 kg/cm
2
B. 150 kg/cm
2
C. 200 kg/cm
2
D. 250 kg/cm
2
E. 300 kg/cm
2
Show Answer
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Discuss
Correct Answer: 200 kg/cm
2
5. 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
Show Answer
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Correct Answer: 1 :
: 3
6. Efflorescence in cement is caused due to an excess of
Options
A. alumina
B. iron oxide
C. silica
D. alkalis
E. magnesium oxide.
Show Answer
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Discuss
Correct Answer: alkalis
7. 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.
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Discuss
Correct Answer: all the above.
8. 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.
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Correct Answer: 40 mm to 50 mm
9. Allowable shear strength of concrete, depends upon
Options
A. shear strength
B. tensile strength
C. compressive strength
D. none of these.
Show Answer
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Discuss
Correct Answer: shear strength
10. 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.
Show Answer
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Discuss
Correct Answer: all the above.
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