Concrete Technology MCQs Set-2

Page 1 of 4

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

fine aggregate

coarse aggregate

cyclopean aggregate

all in aggregate

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

preliminary test

works test

none of these

slump test

3. The percentage of voids in cement is approximately

40%

80%

60%

25%

4. Reinforced cement concrete is equally strong in taking

tensile and compressive stresses

tensile and shear stresses

compressive and shear stresses

tensile, compressive and shear stresses

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

shape of the aggregate

grading of the aggregate

specific gravity of the aggregate

average size of particles in the aggregate

6. Modulus of rupture of concrete is a measure of

flexural tensile strength

direct tensile strength

compressive strength

split tensile strength

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

350 kg

450 kg

200 kg

100 kg

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

0.5

1.0

0.33

0.75

9. Curing period required is minimum for the concrete using

portland slag cement

ordinary portland cement

rapid hardening cement

low heat portland cement

10. 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

Page 2 of 4

11. Normally, when ordinary Portland cement hydrates

heat is absorbed

cement paste cools down below atmospheric temperature

heat evolves

heat neither evolves nor is absorbed

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

catalyst

binding material

filler

all of these

13. 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

between 1.5 and 2

greater than 2

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

cube

none of these

cylinder

frustum of a cone

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

high heat generation

none of these

rapid hardening

high early strength

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

mm/h

mm

mm²/h

minutes

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

increasing the setting time by about 1 hour

decreasing the setting time by about 4 hour

decreasing the setting time by about 1 hour

increasing the setting time by about 4 hour

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

lime

silica

alumina

iron oxide

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

all of these

homogeneity

consistency

mobility

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

silt

sand

clay

none of these

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

all of these

furnace clinker

saw dust

coke breeze

23. The type of lime used in lime concrete is

poor lime

hydraulic lime

fat lime

slaked lime

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

100mm, 300mm, 200mm

200mm, 100mm, 300mm

100mm, 200mm, 300mm

200mm, 300mm, 100mm

25. Rapid hardening cement is used

all of these

where high early strength is desired

for constructing road pavements

where form work is to be removed as early as possible

26. A higher modular ratio shows

higher compressive strength of concrete

lower tensile strength of steel

lower compressive strength of concrete

higher tensile strength of steel

27. According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

the least lateral dimension

4 times the least lateral dimension

3 times the least lateral dimension

2 times the least lateral dimension

28. The maximum particle size of fine aggregate is

5.85 mm

2.5 mm

6.5 mm

4.75 mm

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

0.70

0.60

0.50

0.65

30. The admixtures are added in concrete to

reduce the bleeding and segregation of concrete mix

make the concrete water proof, acid proof etc.

all of these

accelerate the rate of setting and hardening of cement

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), (ii) and (iii)

(i) and (ii)

(ii) and (iii)

(i) and (iii)

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

7 days

28 days

3 days

14 days

33. 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

34. In lime concrete, lime is used as

binding material

fine aggregate

admixture

coarse aggregate

35. The maximum particle size of coarse aggregate is

75 mm

45 mm

55 mm

65 mm

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

directly proportional to compressive strength

directly proportional to square root of compressive strength

inversely proportional to compressive strength

inversely proportional to square root of compressive strength

37. 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 its mean dimension

its length is equal to 1.8 times its mean dimension

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

low heat cement

high alumina cement

sulphate resisting cement

rapid hardening cement

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

chalk

lime stone

all of these

shells

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

Alumina

Lime

Iron oxide

Silica

Concrete Technology MCQs Set-2

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