Concrete Technology MCQs Set-2

Page 1 of 4

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

sulphate resisting cement

low heat cement

rapid hardening cement

high alumina cement

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

between 1.5 and 2

between 1 and 1.5

greater than 2

less than 1

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

mm²/h

minutes

mm/h

mm

4. Lime when added in excess quantity

(a) makes the cement unsound

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

(b) causes the cement to expand and disintegrate

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

lime

iron oxide

silica

alumina

6. 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

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

grading of the aggregate

average size of particles in the aggregate

shape of the aggregate

specific gravity of the aggregate

8. 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

the least lateral dimension

4 times the least lateral dimension

3 times the least lateral dimension

9. The maximum particle size of fine aggregate is

5.85 mm

6.5 mm

4.75 mm

2.5 mm

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

lime stone

all of these

shells

chalk

Page 2 of 4

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

0.5

0.75

1.0

0.33

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

works test

preliminary test

slump test

none of these

13. The type of lime used in lime concrete is

hydraulic lime

slaked lime

fat lime

poor lime

14. 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

15. 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

16. The maximum particle size of coarse aggregate is

55 mm

75 mm

45 mm

65 mm

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

furnace clinker

coke breeze

saw dust

all of these

18. Modulus of rupture of concrete is a measure of

compressive strength

split tensile strength

flexural tensile strength

direct tensile strength

19. 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), (ii) and (iii)

(ii) and (iii)

(i) and (ii)

(i) and (iii)

20. The aggregate is said to be flaky when

its length is equal to 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 1.8 times its mean dimension

Page 3 of 4

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

7 days

14 days

3 days

28 days

22. Normally, when ordinary Portland cement hydrates

heat is absorbed

cement paste cools down below atmospheric temperature

heat evolves

heat neither evolves nor is absorbed

23. In lime concrete, lime is used as

coarse aggregate

binding material

admixture

fine aggregate

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

all in aggregate

cyclopean aggregate

fine aggregate

coarse aggregate

25. Curing period required is minimum for the concrete using

portland slag cement

rapid hardening cement

low heat portland cement

ordinary portland cement

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

0.65

0.70

0.50

0.60

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

clay

none of these

silt

sand

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

low

very low

high

medium

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

100mm, 300mm, 200mm

100mm, 200mm, 300mm

200mm, 100mm, 300mm

200mm, 300mm, 100mm

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

450 kg

100 kg

350 kg

200 kg

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31. Reinforced cement concrete is equally strong in taking

tensile and shear stresses

compressive and shear stresses

tensile, compressive and shear stresses

tensile and compressive stresses

32. 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

33. 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

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

Alumina

Iron oxide

Silica

Lime

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

rapid hardening

high early strength

high heat generation

none of these

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

consistency

homogeneity

mobility

all of these

37. The percentage of voids in cement is approximately

60%

40%

80%

25%

38. 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

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

catalyst

binding material

filler

all of these

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

cylinder

none of these

frustum of a cone

cube

Concrete Technology MCQs Set-2

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