Concrete Technology MCQs Set-2

Page 1 of 4

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

none of these

cube

frustum of a cone

cylinder

2. Normally, when ordinary Portland cement hydrates

heat is absorbed

cement paste cools down below atmospheric temperature

heat neither evolves nor is absorbed

heat evolves

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

7 days

3 days

28 days

14 days

4. The maximum particle size of coarse aggregate is

75 mm

45 mm

55 mm

65 mm

5. Curing period required is minimum for the concrete using

rapid hardening cement

ordinary portland cement

portland slag cement

low heat portland cement

6. Lime when added in excess quantity

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

(a) makes the cement unsound

(b) causes the cement to expand and disintegrate

7. The percentage of voids in cement is approximately

60%

40%

25%

80%

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

silt

none of these

clay

sand

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

coarse aggregate

cyclopean aggregate

10. A higher modular ratio shows

higher tensile strength of steel

lower tensile strength of steel

higher compressive strength of concrete

lower compressive strength of concrete

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11. 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 its mean dimension

its length is equal to 1.8 times its mean dimension

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

b) weight batching only

a) volume batching only

c) both (a) and (b)

d) none of these

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

high heat generation

rapid hardening

high early strength

none of these

14. 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

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

350 kg

450 kg

200 kg

100 kg

16. Reinforced cement concrete is equally strong in taking

tensile, compressive and shear stresses

tensile and compressive stresses

compressive and shear stresses

tensile and shear stresses

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

furnace clinker

saw dust

coke breeze

all of these

18. 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

19. 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

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

lime

iron oxide

silica

alumina

Page 3 of 4

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

0.5

0.75

0.33

1.0

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

catalyst

filler

all of these

binding material

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

mobility

homogeneity

all of these

consistency

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

none of these

slump test

works test

preliminary test

25. 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

26. The type of lime used in lime concrete is

poor lime

fat lime

hydraulic lime

slaked lime

27. In lime concrete, lime is used as

fine aggregate

admixture

coarse aggregate

binding material

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

high alumina cement

rapid hardening cement

sulphate resisting cement

low heat cement

29. Modulus of rupture of concrete is a measure of

flexural tensile strength

split tensile strength

direct tensile strength

compressive strength

30. 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)

(ii) and (iii)

(i) and (iii)

Page 4 of 4

31. 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

32. The maximum particle size of fine aggregate is

5.85 mm

4.75 mm

6.5 mm

2.5 mm

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

Silica

Lime

Iron oxide

Alumina

34. The admixtures are added in concrete to

accelerate the rate of setting and hardening of cement

make the concrete water proof, acid proof etc.

all of these

reduce the bleeding and segregation of concrete mix

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

lime stone

chalk

shells

all of these

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

minutes

mm

mm²/h

mm/h

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

very low

low

high

medium

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

decreasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

increasing the setting time by about 4 hour

increasing the setting time by about 1 hour

39. 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

between 1 and 1.5

less than 1

40. 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

Concrete Technology MCQs Set-2

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