Concrete Technology MCQs Set-2

Page 1 of 4

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

lime stone

shells

chalk

all of these

2. Curing period required is minimum for the concrete using

low heat portland cement

rapid hardening cement

ordinary portland cement

portland slag cement

3. 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

(ii) and (iii)

(i) and (iii)

(i) and (ii)

(i), (ii) and (iii)

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

none of these

high heat generation

rapid hardening

high early strength

5. Normally, when ordinary Portland cement hydrates

heat is absorbed

heat neither evolves nor is absorbed

heat evolves

cement paste cools down below atmospheric temperature

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

clay

sand

none of these

silt

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

rapid hardening cement

sulphate resisting cement

high alumina cement

low heat cement

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

Iron oxide

Lime

Alumina

Silica

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

none of these

works test

preliminary test

slump test

10. Reinforced cement concrete is equally strong in taking

compressive and shear stresses

tensile and compressive stresses

tensile and shear stresses

tensile, compressive and shear stresses

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

cylinder

frustum of a cone

cube

none of these

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

inversely proportional to compressive strength

inversely proportional to square root of compressive strength

directly proportional to compressive strength

directly proportional to square root of compressive strength

13. A higher modular ratio shows

lower compressive strength of concrete

higher tensile strength of steel

lower tensile strength of steel

higher compressive strength of concrete

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

a) volume batching only

c) both (a) and (b)

b) weight batching only

d) none of these

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

all of these

furnace clinker

saw dust

coke breeze

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

0.50

0.70

0.60

0.65

17. Lime when added in excess quantity

(b) causes the cement to expand and disintegrate

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

(a) makes the cement unsound

18. 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

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

mm²/h

mm/h

minutes

mm

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

the least lateral dimension

2 times the least lateral dimension

4 times the least lateral dimension

3 times the least lateral dimension

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

350 kg

100 kg

450 kg

200 kg

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

1.0

0.75

0.33

0.5

23. The maximum particle size of coarse aggregate is

45 mm

65 mm

55 mm

75 mm

24. 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

25. In lime concrete, lime is used as

binding material

fine aggregate

coarse aggregate

admixture

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

mobility

consistency

all of these

homogeneity

27. Modulus of rupture of concrete is a measure of

split tensile strength

flexural tensile strength

direct tensile strength

compressive strength

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

very low

high

low

medium

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

200mm, 300mm, 100mm

100mm, 200mm, 300mm

100mm, 300mm, 200mm

200mm, 100mm, 300mm

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

decreasing the setting time by about 1 hour

increasing the setting time by about 1 hour

increasing the setting time by about 4 hour

decreasing the setting time by about 4 hour

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

cyclopean aggregate

coarse aggregate

all in aggregate

fine aggregate

32. 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

less than 1

between 1 and 1.5

33. The type of lime used in lime concrete is

slaked lime

fat lime

hydraulic lime

poor lime

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

alumina

iron oxide

lime

silica

35. The percentage of voids in cement is approximately

40%

80%

60%

25%

36. The aggregate is said to be flaky when

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

its length is equal to 1.8 times its mean dimension

37. The admixtures are added in concrete to

make the concrete water proof, acid proof etc.

all of these

reduce the bleeding and segregation of concrete mix

accelerate the rate of setting and hardening of cement

38. The maximum particle size of fine aggregate is

4.75 mm

2.5 mm

6.5 mm

5.85 mm

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

catalyst

all of these

binding material

filler

40. Rapid hardening cement is used

where high early strength is desired

where form work is to be removed as early as possible

all of these

for constructing road pavements

Concrete Technology MCQs Set-2

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