Concrete Technology MCQs Set-2

Page 1 of 4

1. Modulus of rupture of concrete is a measure of

compressive strength

split tensile strength

direct tensile strength

flexural tensile strength

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

clay

sand

none of these

silt

3. Normally, when ordinary Portland cement hydrates

cement paste cools down below atmospheric temperature

heat is absorbed

heat neither evolves nor is absorbed

heat evolves

4. The aggregate is said to be flaky when

its least dimension is equal to its mean dimension

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

its length is equal to 1.8 times its mean dimension

its length is equal to its mean dimension

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

all of these

chalk

shells

lime stone

6. A higher modular ratio shows

lower tensile strength of steel

higher tensile strength of steel

lower compressive strength of concrete

higher compressive strength of concrete

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

homogeneity

mobility

all of these

consistency

8. Curing period required is minimum for the concrete using

rapid hardening cement

portland slag cement

low heat portland cement

ordinary portland cement

9. 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

4 times the least lateral dimension

2 times the least lateral dimension

the least lateral dimension

10. The maximum particle size of fine aggregate is

4.75 mm

6.5 mm

2.5 mm

5.85 mm

Page 2 of 4

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. The function of aggregates in concrete is to serve as

binding material

all of these

filler

catalyst

13. The maximum particle size of coarse aggregate is

65 mm

55 mm

75 mm

45 mm

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

less than 1

between 1.5 and 2

between 1 and 1.5

greater than 2

15. The percentage of voids in cement is approximately

40%

60%

25%

80%

16. The admixtures are added in concrete to

reduce the bleeding and segregation of concrete mix

all of these

accelerate the rate of setting and hardening of cement

make the concrete water proof, acid proof etc.

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

200mm, 300mm, 100mm

100mm, 300mm, 200mm

100mm, 200mm, 300mm

200mm, 100mm, 300mm

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

high early strength

none of these

rapid hardening

high heat generation

19. Lime when added in excess quantity

(b) causes the cement to expand and disintegrate

(a) makes the cement unsound

(d) both (a) and (b)

(c) lowers the clinkering temperature of cement

20. 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

Page 3 of 4

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

very low

high

low

medium

22. In lime concrete, lime is used as

coarse aggregate

binding material

admixture

fine aggregate

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

average size of particles in the aggregate

grading of the aggregate

specific gravity of the aggregate

shape of the aggregate

24. Reinforced cement concrete is equally strong in taking

tensile and compressive stresses

tensile and shear stresses

tensile, compressive and shear stresses

compressive and shear stresses

25. The type of lime used in lime concrete is

hydraulic lime

fat lime

poor lime

slaked lime

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

preliminary test

none of these

slump test

works test

27. Rapid hardening cement is used

where high early strength is desired

all of these

for constructing road pavements

where form work is to be removed as early as possible

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

mm/h

mm

minutes

mm²/h

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

furnace clinker

coke breeze

all of these

saw dust

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

3 days

14 days

7 days

28 days

Page 4 of 4

31. 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)

(i) and (iii)

(ii) and (iii)

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

decreasing the setting time by about 1 hour

increasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

increasing the setting time by about 4 hour

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

inversely proportional to compressive strength

inversely proportional to square root of compressive strength

directly proportional to compressive strength

directly proportional to square root of compressive strength

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

cube

cylinder

none of these

frustum of a cone

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

a) volume batching only

c) both (a) and (b)

d) none of these

b) weight batching only

36. 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

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

0.33

1.0

0.5

0.75

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

450 kg

350 kg

200 kg

100 kg

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

iron oxide

silica

alumina

lime

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

0.50

0.65

0.60

0.70

Concrete Technology MCQs Set-2

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