Concrete Technology MCQs Set-2

Page 1 of 4

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

14 days

7 days

28 days

3 days

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

shells

chalk

all of these

lime stone

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

high alumina cement

low heat cement

rapid hardening cement

sulphate resisting cement

4. The maximum particle size of fine aggregate is

6.5 mm

2.5 mm

4.75 mm

5.85 mm

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

cylinder

frustum of a cone

cube

none of these

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

inversely proportional to square root of compressive strength

directly proportional to compressive strength

directly proportional to square root of compressive strength

inversely proportional to compressive strength

7. Modulus of rupture of concrete is a measure of

direct tensile strength

compressive strength

flexural tensile strength

split tensile strength

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

lime

silica

iron oxide

alumina

9. The percentage of voids in cement is approximately

25%

60%

80%

40%

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

average size of particles in the aggregate

shape of the aggregate

grading of the aggregate

specific gravity of the aggregate

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11. Curing period required is minimum for the concrete using

rapid hardening cement

ordinary portland cement

low heat portland cement

portland slag cement

12. The admixtures are added in concrete to

make the concrete water proof, acid proof etc.

accelerate the rate of setting and hardening of cement

all of these

reduce the bleeding and segregation of concrete mix

13. The type of lime used in lime concrete is

slaked lime

hydraulic lime

fat lime

poor lime

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

all of these

homogeneity

consistency

mobility

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

3 times the least lateral dimension

the least lateral dimension

2 times the least lateral dimension

4 times the least lateral dimension

16. Lime when added in excess quantity

(d) both (a) and (b)

(b) causes the cement to expand and disintegrate

(c) lowers the clinkering temperature of cement

(a) makes the cement unsound

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

Lime

Iron oxide

Silica

Alumina

18. Rapid hardening cement is used

all of these

where form work is to be removed as early as possible

where high early strength is desired

for constructing road pavements

19. Reinforced cement concrete is equally strong in taking

tensile and compressive stresses

tensile, compressive and shear stresses

compressive and shear stresses

tensile and shear stresses

20. The aggregate is said to be flaky when

its length is equal to 1.8 times its mean dimension

its length is equal to its mean dimension

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

its least dimension is equal to its mean dimension

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

none of these

slump test

works test

preliminary test

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

c) both (a) and (b)

b) weight batching only

d) none of these

a) volume batching only

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

decreasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

increasing the setting time by about 4 hour

increasing the setting time by about 1 hour

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

filler

catalyst

all of these

binding material

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

between 1.5 and 2

between 1 and 1.5

greater than 2

less than 1

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

all in aggregate

cyclopean aggregate

fine aggregate

coarse aggregate

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

100mm, 300mm, 200mm

200mm, 300mm, 100mm

200mm, 100mm, 300mm

100mm, 200mm, 300mm

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

clay

silt

sand

none of these

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

0.70

0.60

0.65

0.50

30. In lime concrete, lime is used as

fine aggregate

binding material

coarse aggregate

admixture

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

200 kg

450 kg

100 kg

350 kg

32. 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) and (iii)

(ii) and (iii)

(i) and (ii)

(i), (ii) and (iii)

33. The maximum particle size of coarse aggregate is

65 mm

45 mm

55 mm

75 mm

34. A higher modular ratio shows

lower compressive strength of concrete

higher tensile strength of steel

higher compressive strength of concrete

lower tensile strength of steel

35. Normally, when ordinary Portland cement hydrates

heat neither evolves nor is absorbed

heat evolves

heat is absorbed

cement paste cools down below atmospheric temperature

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

saw dust

coke breeze

furnace clinker

all of these

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

high early strength

none of these

high heat generation

rapid hardening

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

0.5

0.33

0.75

1.0

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

low

high

medium

very low

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

mm/h

minutes

mm

mm²/h

Concrete Technology MCQs Set-2

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