Concrete Technology MCQs Set-2

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1. Normally, when ordinary Portland cement hydrates

cement paste cools down below atmospheric temperature

heat neither evolves nor is absorbed

heat evolves

heat is absorbed

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

350 kg

100 kg

450 kg

200 kg

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

high heat generation

high early strength

rapid hardening

none of these

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

4 times the least lateral dimension

the least lateral dimension

2 times the least lateral dimension

3 times the least lateral dimension

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

all of these

coke breeze

furnace clinker

saw dust

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

slump test

preliminary test

works test

none of these

7. The admixtures are added in concrete to

accelerate the rate of setting and hardening of cement

all of these

make the concrete water proof, acid proof etc.

reduce the bleeding and segregation of concrete mix

8. Lime when added in excess quantity

(a) makes the cement unsound

(c) lowers the clinkering temperature of cement

(d) both (a) and (b)

(b) causes the cement to expand and disintegrate

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

consistency

all of these

mobility

homogeneity

10. The maximum particle size of coarse aggregate is

55 mm

75 mm

65 mm

45 mm

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

binding material

all of these

filler

catalyst

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

Alumina

Silica

Iron oxide

Lime

13. The percentage of voids in cement is approximately

80%

25%

60%

40%

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

all in aggregate

coarse aggregate

cyclopean aggregate

fine aggregate

15. 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 (ii)

(i), (ii) and (iii)

(i) and (iii)

(ii) and (iii)

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

less than 1

greater than 2

between 1.5 and 2

between 1 and 1.5

17. Modulus of rupture of concrete is a measure of

flexural tensile strength

direct tensile strength

compressive strength

split tensile strength

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

mm/h

minutes

mm²/h

mm

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

shells

lime stone

all of these

chalk

20. The maximum particle size of fine aggregate is

4.75 mm

6.5 mm

2.5 mm

5.85 mm

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21. Reinforced cement concrete is equally strong in taking

tensile and shear stresses

tensile and compressive stresses

tensile, compressive and shear stresses

compressive and shear stresses

22. In lime concrete, lime is used as

admixture

coarse aggregate

fine aggregate

binding material

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

directly proportional to square root of compressive strength

inversely proportional to square root of compressive strength

directly proportional to compressive strength

inversely proportional to compressive strength

24. Curing period required is minimum for the concrete using

low heat portland cement

rapid hardening cement

ordinary portland cement

portland slag cement

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

silt

none of these

sand

clay

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

frustum of a cone

cube

cylinder

none of these

27. 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

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

14 days

3 days

28 days

7 days

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

0.33

1.0

0.5

0.75

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

very low

high

low

medium

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

sulphate resisting cement

rapid hardening cement

low heat cement

high alumina cement

32. Rapid hardening cement is used

for constructing road pavements

where high early strength is desired

all of these

where form work is to be removed as early as possible

33. The type of lime used in lime concrete is

hydraulic lime

slaked lime

fat lime

poor lime

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

specific gravity of the aggregate

average size of particles in the aggregate

grading of the aggregate

shape of the aggregate

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

alumina

iron oxide

lime

silica

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

d) none of these

c) both (a) and (b)

a) volume batching only

b) weight batching only

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

100mm, 200mm, 300mm

200mm, 100mm, 300mm

100mm, 300mm, 200mm

200mm, 300mm, 100mm

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

0.60

0.50

0.70

0.65

39. A higher modular ratio shows

higher compressive strength of concrete

higher tensile strength of steel

lower tensile strength of steel

lower compressive strength of concrete

40. The aggregate is said to be flaky when

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

its least dimension is equal to its mean dimension

its length is equal to 1.8 times its mean dimension

its length is equal to its mean dimension

Concrete Technology MCQs Set-2

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