Concrete Technology MCQs Set-2

Page 1 of 4

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

450 kg

200 kg

100 kg

350 kg

2. A higher modular ratio shows

lower tensile strength of steel

lower compressive strength of concrete

higher compressive strength of concrete

higher tensile strength of steel

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

mobility

homogeneity

all of these

consistency

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

mm

mm/h

minutes

mm²/h

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

preliminary test

slump test

works test

none of these

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

0.75

0.33

1.0

0.5

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

average size of particles in the aggregate

specific gravity of the aggregate

grading of the aggregate

shape of the aggregate

8. Normally, when ordinary Portland cement hydrates

heat evolves

heat neither evolves nor is absorbed

heat is absorbed

cement paste cools down below atmospheric temperature

9. In lime concrete, lime is used as

binding material

coarse aggregate

admixture

fine aggregate

10. 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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11. 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

12. 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

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

200mm, 100mm, 300mm

100mm, 300mm, 200mm

200mm, 300mm, 100mm

100mm, 200mm, 300mm

14. Rapid hardening cement is used

where form work is to be removed as early as possible

for constructing road pavements

all of these

where high early strength is desired

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

2 times the least lateral dimension

4 times the least lateral dimension

the least lateral dimension

16. Lime when added in excess quantity

(a) makes the cement unsound

(b) causes the cement to expand and disintegrate

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

17. Modulus of rupture of concrete is a measure of

compressive strength

direct tensile strength

split tensile strength

flexural tensile strength

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

shells

all of these

lime stone

chalk

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

directly proportional to square root of compressive strength

inversely proportional to compressive strength

inversely proportional to square root of compressive strength

directly proportional to compressive strength

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

0.60

0.70

0.50

0.65

Page 3 of 4

21. 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)

22. The maximum particle size of fine aggregate is

4.75 mm

2.5 mm

6.5 mm

5.85 mm

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

silt

sand

clay

none of these

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

less than 1

between 1 and 1.5

greater than 2

between 1.5 and 2

25. The type of lime used in lime concrete is

slaked lime

fat lime

poor lime

hydraulic lime

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

Iron oxide

Lime

Silica

Alumina

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

catalyst

all of these

binding material

filler

28. Curing period required is minimum for the concrete using

low heat portland cement

ordinary portland cement

rapid hardening cement

portland slag cement

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

rapid hardening cement

high alumina cement

sulphate resisting cement

low heat cement

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

d) none of these

a) volume batching only

c) both (a) and (b)

b) weight batching only

Page 4 of 4

31. The admixtures are added in concrete to

accelerate the rate of setting and hardening of cement

all of these

reduce the bleeding and segregation of concrete mix

make the concrete water proof, acid proof etc.

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

saw dust

coke breeze

furnace clinker

all of these

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

increasing the setting time by about 1 hour

increasing the setting time by about 4 hour

decreasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

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

high

very low

medium

low

35. 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

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

alumina

silica

lime

iron oxide

37. The maximum particle size of coarse aggregate is

45 mm

55 mm

75 mm

65 mm

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

14 days

3 days

7 days

28 days

39. The percentage of voids in cement is approximately

80%

60%

40%

25%

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

high early strength

rapid hardening

none of these

high heat generation

Concrete Technology MCQs Set-2

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