Concrete Technology MCQs Set-2

Page 1 of 4

1. A higher modular ratio shows

lower compressive strength of concrete

higher compressive strength of concrete

lower tensile strength of steel

higher tensile strength of steel

2. Reinforced cement concrete is equally strong in taking

tensile and shear stresses

compressive and shear stresses

tensile and compressive stresses

tensile, compressive and shear stresses

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

its length is equal to its mean dimension

4. Lime when added in excess quantity

(d) both (a) and (b)

(a) makes the cement unsound

(b) causes the cement to expand and disintegrate

(c) lowers the clinkering temperature of cement

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

200mm, 300mm, 100mm

100mm, 300mm, 200mm

200mm, 100mm, 300mm

100mm, 200mm, 300mm

6. The percentage of voids in cement is approximately

60%

40%

80%

25%

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

between 1 and 1.5

greater than 2

less than 1

between 1.5 and 2

8. The type of lime used in lime concrete is

slaked lime

poor lime

hydraulic lime

fat lime

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

100 kg

350 kg

200 kg

450 kg

10. Modulus of rupture of concrete is a measure of

flexural tensile strength

compressive strength

split tensile strength

direct tensile strength

Page 2 of 4

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

slump test

preliminary test

none of these

works test

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

none of these

rapid hardening

high early strength

high heat generation

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

medium

very low

low

high

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

Silica

Lime

Alumina

Iron oxide

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

coke breeze

all of these

furnace clinker

saw dust

16. Rapid hardening cement is used

all of these

where form work is to be removed as early as possible

where high early strength is desired

for constructing road pavements

17. In lime concrete, lime is used as

fine aggregate

coarse aggregate

binding material

admixture

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

inversely proportional to compressive strength

directly proportional to compressive strength

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

lime

alumina

iron oxide

silica

20. 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 1 hour

increasing the setting time by about 4 hour

decreasing the setting time by about 4 hour

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. Curing period required is minimum for the concrete using

ordinary portland cement

low heat portland cement

rapid hardening cement

portland slag cement

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

lime stone

shells

chalk

all of these

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

binding material

catalyst

all of these

filler

25. The maximum particle size of coarse aggregate is

65 mm

45 mm

55 mm

75 mm

26. 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

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

mobility

all of these

homogeneity

consistency

28. Normally, when ordinary Portland cement hydrates

cement paste cools down below atmospheric temperature

heat evolves

heat is absorbed

heat neither evolves nor is absorbed

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

7 days

14 days

28 days

3 days

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

(ii) and (iii)

(i) and (iii)

(i) and (ii)

(i), (ii) and (iii)

Page 4 of 4

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

none of these

clay

sand

silt

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

cyclopean aggregate

fine aggregate

coarse aggregate

all in aggregate

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

high alumina cement

sulphate resisting cement

low heat cement

rapid hardening cement

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

0.70

0.50

0.65

0.60

35. 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

4 times the least lateral dimension

the least lateral dimension

3 times the least lateral dimension

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

cube

none of these

cylinder

frustum of a cone

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

minutes

mm²/h

mm

mm/h

38. The admixtures are added in concrete to

accelerate the rate of setting and hardening of cement

reduce the bleeding and segregation of concrete mix

make the concrete water proof, acid proof etc.

all of these

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

0.33

1.0

0.75

0.5

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

grading of the aggregate

shape of the aggregate

specific gravity of the aggregate

average size of particles in the aggregate

Concrete Technology MCQs Set-2

Related

1 Response

Leave a ReplyCancel reply

Secured Payments

Protection

Concrete Technology MCQs Set-2

Share this Now with Friends:

Related

1 Response

Leave a ReplyCancel reply

Secured Payments

Protection