Test your knowledge about Civil Engineering – Concrete Technology by taking this Multi Choice Question (MCQ) quiz. Get your score and actual answers at the end of this quiz.

1. For quality control of Portland cement, the test essentially done is

setting time

soundness

tensile strength

All of these.

2. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

20%

25%

30%

35%

3. Under normal conditions using an ordinary cement, the period of removal of the form work, is

7 days for beam soffits

14 days for bottom slabs of spans 4.6 m and more

21 days for bottom beams over 6 m spans

All of these.

4. For given water content, workability decreases if the concrete aggregates contain an excess of

thin particles

flat particles

elongated particles

All of these.

5. M10 grade of concrete approximates

1 : 3 : 6 mix

1 : 1 : 2 mix

1 : 2 : 4 mix

1 : 1.5 : 3 mix

6. For ensuring quality of concrete, use

single sized aggegates

two sized aggregate

graded aggregates

coarse aggregates.

7. The risk of segregation is more for

wetter mix

larger proportion of maximum size aggregate

coarser grading

all the above.

8. After casting, an ordinary cement concrete on drying

expands

mix

shrinks

none of these.

9. Permissible compressive strength of M 300 concrete grade is

100 kg/cm2

150 kg/cm2

200 kg/cm2

300 kg/cm2

10. While compacting the concrete by a mechanical vibrator, the slump should not exceed

2.5 cm

5.0 cm

7.5 cm

10 cm

11.
An aggregate is said to be flaky if its least dimension is less than

1/5th of mean dimension

2/5th of mean dimension

3/5th of mean dimension

4/5th of mean dimension

12. The increased cohesiveness of concrete, makes it

less liable to segregation

more liable to segregation

more liable to bleeding

more liable for surface scaling in frosty weather

13. The ratio of the length to breadth of a wooden float, is

4.5

5.5

6.5

7.5

14. Workability improved by adding

air-entraining agent

foaming agent

oily-agent

all the above.

15. The commonly used material in the manufacture of cement is

sand stone

slate

lime stone

graphite.

16. Curing a concrete for long period ensures better

volume stability

strength

water resistance

all the above.

17. For the construction of cement concrete floor, the maximum permissible size of aggregate, is

4 mm

6 mm

8 mm

10 mm

18. The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

grading

curing

mixing

batching

19. Transport of concrete by pumps, is done for a distance of

100 m

200 m

300 m

400 m

20. Slump test is done for

clay

concrete

sand

lime

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