Concrete Technology MCQs Set-2

Page 1 of 4

1. 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

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

100mm, 300mm, 200mm

200mm, 300mm, 100mm

100mm, 200mm, 300mm

200mm, 100mm, 300mm

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

increasing the setting time by about 4 hour

decreasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

increasing the setting time by about 1 hour

4. The admixtures are added in concrete to

reduce the bleeding and segregation of concrete mix

accelerate the rate of setting and hardening of cement

make the concrete water proof, acid proof etc.

all of these

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

silt

sand

clay

none of these

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

2 times the least lateral dimension

4 times the least lateral dimension

3 times the least lateral dimension

the least lateral dimension

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

medium

high

low

very low

8. In lime concrete, lime is used as

admixture

fine aggregate

coarse aggregate

binding material

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

all in aggregate

fine aggregate

cyclopean aggregate

coarse aggregate

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

mm/h

mm²/h

mm

minutes

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11. The maximum particle size of fine aggregate is

6.5 mm

2.5 mm

5.85 mm

4.75 mm

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

3 days

7 days

28 days

14 days

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

high alumina cement

low heat cement

sulphate resisting cement

rapid hardening cement

14. The percentage of voids in cement is approximately

25%

60%

80%

40%

15. 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

0.65

0.70

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

cube

cylinder

none of these

frustum of a cone

17. Normally, when ordinary Portland cement hydrates

cement paste cools down below atmospheric temperature

heat evolves

heat neither evolves nor is absorbed

heat is absorbed

18. 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

19. Curing period required is minimum for the concrete using

rapid hardening cement

ordinary portland cement

low heat portland cement

portland slag cement

20. Lime when added in excess quantity

(d) both (a) and (b)

(b) causes the cement to expand and disintegrate

(a) makes the cement unsound

(c) lowers the clinkering temperature of cement

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21. A higher modular ratio shows

lower tensile strength of steel

lower compressive strength of concrete

higher tensile strength of steel

higher compressive strength of concrete

22. Rapid hardening cement is used

where form work is to be removed as early as possible

where high early strength is desired

all of these

for constructing road pavements

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

Lime

Iron oxide

Alumina

Silica

24. Modulus of rupture of concrete is a measure of

flexural tensile strength

direct tensile strength

compressive strength

split tensile strength

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

silica

iron oxide

lime

alumina

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

shape of the aggregate

specific gravity of the aggregate

average size of particles in the aggregate

grading of the aggregate

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

none of these

works test

slump test

preliminary test

28. The maximum particle size of coarse aggregate is

55 mm

45 mm

65 mm

75 mm

29. The type of lime used in lime concrete is

hydraulic lime

poor lime

slaked lime

fat lime

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

all of these

homogeneity

consistency

mobility

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

lime stone

chalk

shells

all of these

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

saw dust

furnace clinker

all of these

coke breeze

33. 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) and (iii)

(ii) and (iii)

(i), (ii) and (iii)

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

between 1.5 and 2

greater than 2

between 1 and 1.5

less than 1

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

100 kg

450 kg

350 kg

200 kg

36. Reinforced cement concrete is equally strong in taking

compressive and shear stresses

tensile and shear stresses

tensile and compressive stresses

tensile, compressive and shear stresses

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

1.0

0.75

0.33

0.5

38. 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

39. The aggregate is said to be flaky when

its length is equal to 1.8 times its mean dimension

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 its mean dimension

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

catalyst

all of these

binding material

filler

Concrete Technology MCQs Set-2

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