Concrete Technology MCQs Set-2

Page 1 of 4

1. For a structure subjected to the action of sea water, the cement used is

low heat cement

sulphate resisting cement

rapid hardening cement

high alumina cement

2. The steel mold used for slump test is in the form of a

none of these

cube

frustum of a cone

cylinder

3. The maximum particle size of coarse aggregate is

55 mm

45 mm

75 mm

65 mm

4. Curing period required is minimum for the concrete using

rapid hardening cement

ordinary portland cement

low heat portland cement

portland slag cement

5. The presence of entrained air in concrete results in

i) reducing bleeding

ii) lowering density of concrete

iii) decreasing strength at all ages

The correct answer is

(i), (ii) and (iii)

(i) and (iii)

(i) and (ii)

(ii) and (iii)

6. If the slump of concrete mix is 70mm, its workability is considered to be

high

very low

medium

low

7. Modulus of rupture of concrete is a measure of

compressive strength

direct tensile strength

split tensile strength

flexural tensile strength

8. The aggregate is said to be flaky when

its length is equal to 1.8 times its mean dimension

its least dimension is equal to its mean dimension

its length is equal to its mean dimension

its least dimension is less than three-fifth of its mean dimension

9. The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve is called

cyclopean aggregate

fine aggregate

all in aggregate

coarse aggregate

10. The type of lime used in lime concrete is

poor lime

hydraulic lime

slaked lime

fat lime

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11. Normally, when ordinary Portland cement hydrates

cement paste cools down below atmospheric temperature

heat evolves

heat neither evolves nor is absorbed

heat is absorbed

12. The workability of concrete by slump test is expressed as

mm/h

mm²/h

mm

minutes

13. According to IS: 456-1978, the maximum water-cement ratio in plain concrete to ensure durability in mild exposure is limited to

0.65

0.60

0.50

0.70

14. Calcareous material used in the manufacture of cement consist of

lime stone

shells

chalk

all of these

15. The top diameter, bottom diameter and height of the mould used for slump test are respectively

100mm, 200mm, 300mm

100mm, 300mm, 200mm

200mm, 300mm, 100mm

200mm, 100mm, 300mm

16. The slump test of concrete is used to measure its

homogeneity

mobility

consistency

all of these

17. Low percentage of tricalcium silicate and high percentage of dicalcium silicate in cement result in

high early strength

rapid hardening

none of these

high heat generation

18. The fineness modulus of an aggregate is roughly proportional to

specific gravity of the aggregate

shape of the aggregate

average size of particles in the aggregate

grading of the aggregate

19. For the manufacture of concrete of low density, the aggregate used is

saw dust

furnace clinker

all of these

coke breeze

20. Lime when added in excess quantity

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

(b) causes the cement to expand and disintegrate

(a) makes the cement unsound

Page 3 of 4

21. The function of aggregates in concrete is to serve as

filler

catalyst

all of these

binding material

22. According to IS: 456-1978, minimum period stipulated for moist curing of concrete using ordinary Portland cement is

7 days

28 days

14 days

3 days

23. Addition of sugar in concrete (about 0.05% of weight of cement) results in

decreasing the setting time by about 4 hour

increasing the setting time by about 4 hour

increasing the setting time by about 1 hour

decreasing the setting time by about 1 hour

24. The admixtures are added in concrete to

all of these

reduce the bleeding and segregation of concrete mix

make the concrete water proof, acid proof etc.

accelerate the rate of setting and hardening of cement

25. The material having particle size varying from 0.002 to 0.06 mm is termed as

sand

silt

none of these

clay

26. Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly?

Alumina

Iron oxide

Silica

Lime

27. In concrete mix design, allowance for bulking of sand is necessary in case of

c) both (a) and (b)

d) none of these

a) volume batching only

b) weight batching only

28. According to IS:456-1978, the flexural strength of concrete is

inversely proportional to compressive strength

directly proportional to compressive strength

directly proportional to square root of compressive strength

inversely proportional to square root of compressive strength

29. A higher modular ratio shows

lower tensile strength of steel

higher tensile strength of steel

higher compressive strength of concrete

lower compressive strength of concrete

30. The test conducted in the laboratory on the specimen made out of trial concrete mix is called

none of these

preliminary test

slump test

works test

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31. The chemical ingredient of cement which provides quick setting property to the cement is

lime

silica

alumina

iron oxide

32. According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

the least lateral dimension

4 times the least lateral dimension

2 times the least lateral dimension

3 times the least lateral dimension

33. In lime concrete, lime is used as

admixture

fine aggregate

coarse aggregate

binding material

34. The maximum quantity of aggregate per 50kg of cement should not exceed

100 kg

200 kg

450 kg

350 kg

35. Rapid hardening cement is used

all of these

where high early strength is desired

for constructing road pavements

where form work is to be removed as early as possible

36. The approximate value of the ratio between direct tensile strength and flexural strength is

1.0

0.33

0.5

0.75

37. The maximum particle size of fine aggregate is

5.85 mm

4.75 mm

6.5 mm

2.5 mm

38. The percentage of voids in cement is approximately

25%

60%

40%

80%

39. Reinforced cement concrete is equally strong in taking

tensile and shear stresses

tensile, compressive and shear stresses

compressive and shear stresses

tensile and compressive stresses

40. The slab is designed as one way if the ratio of long span to short span is

greater than 2

between 1.5 and 2

between 1 and 1.5

less than 1

Concrete Technology MCQs Set-2

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