Concrete Technology MCQs Set-2

Page 1 of 4

1. Normally, when ordinary Portland cement hydrates

heat evolves

heat is absorbed

cement paste cools down below atmospheric temperature

heat neither evolves nor is absorbed

2. Modulus of rupture of concrete is a measure of

flexural tensile strength

compressive strength

split tensile strength

direct tensile strength

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

cylinder

frustum of a cone

none of these

cube

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

0.5

0.33

0.75

1.0

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

100 kg

350 kg

450 kg

200 kg

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

100mm, 200mm, 300mm

200mm, 300mm, 100mm

100mm, 300mm, 200mm

200mm, 100mm, 300mm

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

specific gravity of the aggregate

grading of the aggregate

average size of particles in the aggregate

shape of the aggregate

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

homogeneity

consistency

mobility

all of these

9. The maximum particle size of coarse aggregate is

45 mm

65 mm

75 mm

55 mm

10. Curing period required is minimum for the concrete using

portland slag cement

low heat portland cement

ordinary portland cement

rapid hardening cement

Page 2 of 4

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

low

very low

high

medium

12. The percentage of voids in cement is approximately

40%

80%

25%

60%

13. 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

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

all of these

lime stone

shells

chalk

15. The aggregate is said to be flaky when

its length is equal to 1.8 times its mean dimension

its least dimension is equal to its mean dimension

its length is equal to its mean dimension

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

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

catalyst

filler

binding material

all of these

17. 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

18. 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

19. The admixtures are added in concrete to

reduce the bleeding and segregation of concrete mix

accelerate the rate of setting and hardening of cement

make the concrete water proof, acid proof etc.

all of these

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

high heat generation

high early strength

rapid hardening

none of these

Page 3 of 4

21. The maximum particle size of fine aggregate is

4.75 mm

6.5 mm

2.5 mm

5.85 mm

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

silt

sand

clay

none of these

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

directly proportional to square root of compressive strength

inversely proportional to compressive strength

directly proportional to compressive strength

inversely proportional to square root of compressive strength

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

increasing the setting time by about 4 hour

increasing the setting time by about 1 hour

decreasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

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

b) weight batching only

c) both (a) and (b)

d) none of these

a) volume batching only

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

0.50

0.60

0.65

0.70

27. Lime when added in excess quantity

(d) both (a) and (b)

(b) causes the cement to expand and disintegrate

(c) lowers the clinkering temperature of cement

(a) makes the cement unsound

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

mm/h

minutes

mm²/h

mm

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

less than 1

greater than 2

between 1 and 1.5

between 1.5 and 2

30. Rapid hardening cement is used

where high early strength is desired

for constructing road pavements

where form work is to be removed as early as possible

all of these

Page 4 of 4

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

coarse aggregate

fine aggregate

cyclopean aggregate

all in aggregate

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

furnace clinker

all of these

coke breeze

saw dust

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

lime

silica

iron oxide

alumina

34. The type of lime used in lime concrete is

hydraulic lime

poor lime

slaked lime

fat lime

35. 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

(ii) and (iii)

(i) and (iii)

(i), (ii) and (iii)

(i) and (ii)

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

preliminary test

none of these

works test

slump test

37. 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

38. 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

2 times the least lateral dimension

3 times the least lateral dimension

the least lateral dimension

39. In lime concrete, lime is used as

fine aggregate

coarse aggregate

binding material

admixture

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

Lime

Alumina

Silica

Iron oxide

Concrete Technology MCQs Set-2

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