1. For quality control of Portland cement, the test essentially
done is
A. setting
time
B. soundness
C. tensile
strength
D. consistency
E. all the
above.
Answer & Explanation
Answer: Option E
Explanation:
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2. If 1500 g of water is required to have a cement paste
1875 g of normal consistency, the percentage of water is,
A. 20% B. 25%
C. 30% D. 35%
E. 40%
Answer & Explanation
Answer: Option B
Explanation:
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3. Under normal conditions using an ordinary cement, the
period of removal of the form work, is :
A. 7 days
for beam soffits
B. 14 days
for bottom slabs of spans 4.6 m and more
C. 21 days
for bottom beams over 6 m spans
D. 2 days
for vertical sides of columns
E. all the
above.
Answer & Explanation
Answer: Option E
Explanation:
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4. For given water content, workability decreases if the
concrete aggregates contain an excess of
A. thin
particles
B. flat
particles
C. elongated
particles
D. flaky
paticles
E. all the
above.
Answer & Explanation
Answer: Option E
Explanation:
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6. M10 grade of concrete approximates
A. 1 : 3 : 6
mix
B. 1 : 1 : 2
mix
C. 1 : 2 : 4
mix
D. 1 : 1.5 :
3 mix
E. none of
these.
Answer & Explanation
Answer: Option A
Explanation:
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7. For ensuring quality of concrete, use
A. single
sized aggegates
B. two sized
aggregate
C. graded
aggregates
D. coarse
aggregates.
Answer & Explanation
Answer: Option C
Explanation:
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8. According to I.S. : 456, the number of grades of concrete
mixes, is
A. 3 B. 4
C. 5 D. 6
E. 7
Answer & Explanation
Answer: Option E
Explanation:
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9. The mixture of different ingredients of cement, is burnt
at
A. 1000°C B. 1200°C
C. 1400°C D. 1600°C
E. 1800°C
Answer & Explanation
Answer: Option C
Explanation:
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10. The risk of segregation is more for
A. wetter
mix
B. larger
proportion of maximum size aggregate
C. coarser
grading
D. all the
above.
Answer & Explanation
Answer: Option D
Explanation:
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11. After casting, an ordinary cement concrete on drying
A. expands
B. mix
C. shrinks
D. none of
these.
Answer & Explanation
Answer: Option C
Explanation:
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12. Hydration of cement is due to chemical action of water
with
A. Tricalcium
silicate and dicalcium silicate
B. Dicalcium
silicate and tricalcium aluminate
C. Tricalcium
aluminate and tricalcium alumino ferrite
D. All the
above.
Answer & Explanation
Answer: Option D
Explanation:
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13. To obtain cement dry powder, lime stones and shales or
their slurry, is burnt in a rotary kiln at a temperature between
A. 1100° and
1200°C
B. 1200° and
1300°C
C. 1300° and
1400°C
D. 1400° and
1500°C
E. 1500° and
1600°C
Answer & Explanation
Answer: Option D
Explanation:
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14. Permissible compressive strength of M 300 concrete grade
is
A. 100
kg/cm2
B. 150
kg/cm2
C. 200
kg/cm2
D. 250
kg/cm2
E. 300
kg/cm2
Answer & Explanation
Answer: Option E
Explanation:
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15. The standard sand now a days used in India, is obtained
from
A. Jaipur
(Rajasthan)
B. Jullundur
(Punjab)
C. Hyderabad
(Andhra Pradesh)
D. Ennore
(Madras)
E. Cuttuck
(Orissa).
Answer & Explanation
Answer: Option D
Explanation:
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16. The maximum amount of dust which may be permitted in
aggregates is
A. 5% of the
total aggregates for low workability with a coarse grading
B. 10% of
the total aggregates for low workability with a fine grading
C. 20% of
the total aggregates for a mix having high workability with fine grading
D. all the
above.
Answer & Explanation
Answer: Option D
Explanation:
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17. Proper proportioning of concrete, ensures
A. desired
strength and workability
B. desired
durability
C. water
tightness of the structure
D. resistance
to water
E. all the
above.
Answer & Explanation
Answer: Option E
Explanation:
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18. The bulk density of aggregates does not depend upon :
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.
Answer & Explanation
Answer: Option D
Explanation:
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19. Curing is….
A. reduces
the shrinkage of concrete
B. preserves
the properties of concrete
C. prevents
the loss of water by evaporation
D. all of
the above.
Answer & Explanation
Answer: Option D
Explanation:
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20. While compacting the concrete by a mechanical vibrator,
the slump should not exceed
A. 2.5 cm
B. 5.0 cm
C. 7.5 cm
D. 10 cm
E. 15 cm
Answer & Explanation
Answer: Option B
Explanation:
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21. Construction joints are provided
A. where
B.M. and S.F. are small
B. where the
member is supported by other member
C. at 18 m
apart in huge structures
D. in
concrete wall at sill level of windows
E. all the
above.
Answer & Explanation
Answer: Option E
Explanation:
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22. An aggregate is said to be flaky if its least dimension
is less than
A. 1/5th of
mean dimension
B. 2/5th of
mean dimension
C. 3/5th of
mean dimension
D. 4/5th of
mean dimension
E. none of
these.
Answer & Explanation
Answer: Option C
Explanation:
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23. The following proportion of the ingredients of concrete
mix, is not in conformation to arbitrary method of proportioning
A. 1 : 1 : 2
B. 1 : 2 : 4
C. 1 : 3 : 6
D. 1 : 2 : 8
E. 1 : 4 :
10
Answer & Explanation
Answer: Option E
Explanation:
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24. The increased cohesiveness of concrete, makes it
A. less
liable to segregation
B. more
liable to segregation
C. more
liable to bleeding
D. more
liable for surface scaling in frosty weather
E. none of
these.
Answer & Explanation
Answer: Option A
Explanation:
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25. The ratio of the length to breadth of a wooden float, is
A. 4.5 B. 5.5
C. 6.5 D. 7.5
E. 8.5
Answer & Explanation
Answer: Option D
Explanation:
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