Concrete Technology MCQs Set-2

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1. 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

4 times the least lateral dimension

2 times the least lateral dimension

2. Rapid hardening cement is used

all of these

where form work is to be removed as early as possible

for constructing road pavements

where high early strength is desired

3. Modulus of rupture of concrete is a measure of

direct tensile strength

flexural tensile strength

split tensile strength

compressive strength

4. The percentage of voids in cement is approximately

25%

60%

80%

40%

5. Reinforced cement concrete is equally strong in taking

tensile, compressive and shear stresses

compressive and shear stresses

tensile and compressive stresses

tensile and shear stresses

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

consistency

mobility

homogeneity

all of these

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

0.33

0.5

1.0

0.75

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

minutes

mm/h

mm²/h

mm

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

rapid hardening cement

low heat cement

high alumina cement

sulphate resisting cement

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

lime

silica

alumina

iron oxide

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

Lime

Silica

Iron oxide

Alumina

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

decreasing the setting time by about 4 hour

decreasing the setting time by about 1 hour

increasing the setting time by about 4 hour

increasing the setting time by about 1 hour

13. 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

14. 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)

(ii) and (iii)

(i), (ii) and (iii)

(i) and (iii)

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

200mm, 100mm, 300mm

200mm, 300mm, 100mm

100mm, 200mm, 300mm

100mm, 300mm, 200mm

16. 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

17. A higher modular ratio shows

lower compressive strength of concrete

lower tensile strength of steel

higher tensile strength of steel

higher compressive strength of concrete

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

fine aggregate

coarse aggregate

all in aggregate

cyclopean aggregate

19. Curing period required is minimum for the concrete using

low heat portland cement

ordinary portland cement

portland slag cement

rapid hardening cement

20. The aggregate is said to be flaky when

its least dimension is equal to its mean dimension

its length is equal to 1.8 times its mean dimension

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

its length is equal to its mean dimension

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

d) none of these

c) both (a) and (b)

b) weight batching only

a) volume batching only

22. Lime when added in excess quantity

(a) makes the cement unsound

(c) lowers the clinkering temperature of cement

(b) causes the cement to expand and disintegrate

(d) both (a) and (b)

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

catalyst

binding material

filler

all of these

24. The admixtures are added in concrete to

reduce the bleeding and segregation of concrete mix

accelerate the rate of setting and hardening of cement

all of these

make the concrete water proof, acid proof etc.

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

high early strength

high heat generation

none of these

rapid hardening

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

silt

sand

none of these

clay

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

high

low

very low

medium

28. Normally, when ordinary Portland cement hydrates

heat is absorbed

cement paste cools down below atmospheric temperature

heat evolves

heat neither evolves nor is absorbed

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

all of these

chalk

lime stone

shells

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

frustum of a cone

cube

cylinder

none of these

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

inversely proportional to square root of compressive strength

inversely proportional to compressive strength

directly proportional to compressive strength

directly proportional to square root of compressive strength

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

specific gravity of the aggregate

shape of the aggregate

grading of the aggregate

average size of particles in the aggregate

33. The maximum particle size of coarse aggregate is

75 mm

45 mm

55 mm

65 mm

34. The maximum particle size of fine aggregate is

2.5 mm

4.75 mm

6.5 mm

5.85 mm

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

0.70

0.65

0.50

0.60

36. The type of lime used in lime concrete is

slaked lime

hydraulic lime

fat lime

poor lime

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

all of these

saw dust

coke breeze

furnace clinker

38. In lime concrete, lime is used as

admixture

coarse aggregate

fine aggregate

binding material

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

200 kg

350 kg

100 kg

450 kg

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

works test

slump test

preliminary test

none of these

Concrete Technology MCQs Set-2

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