Trb Final Material

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Concrete Technology

Section 1

1. For quality control of Portland cement, the test essentially done is

A. setting time

B. soundness

C. tensile strength

D. consistency

E. all the above.

Answer: OptionE2. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the

percentage of water is,

A. 20% B. 25%

C. 30% D. 35%

E. 40%

Answer: OptionBWeight of water = 1500g.

Weight of cement paste = 1875g.

Weight of cement = 1875-1500.

= 375g.

% of water = wt.of cement/wt.of water.

= (375/1500)*100.

= 25%.3. Under normal conditions using an ordinary cement, the period of removal of the form work, is

:

A. 7 days for beam soffits

B. 14 days for bottom slabs of spans 4.6 m and more

C. 21 days for bottom beams over 6 m spans

D. 2 days for vertical sides of columns

E. all the above.

Answer: OptionE


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4. Wp andWfare the weights of a cylinder containing partially compacted and fully compacted

concrete. If the compaction factor is 0.95, the workability of concrete is

A. extremely low

B. very low

C. low

D. high

E. none of these.

Answer: OptionDExtremely low - 0.65 to 0.68.

Very low - 0.75.

low - 0.83 to 0.85.

Medium - 0.90 to 0.92.

High - 0.95.5. For given water content, workability decreases if the concrete aggregates contain an excess of

A. thin particles

B. flat particles

C. elongated particles

D. flaky paticles

E. all the above.

Answer: OptionEAll are the particles have insufficient capability to increase workability.6. M10 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 : 2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

E. none of these.

Answer: OptionAThe sum of all digits of ratio should make it 10, here 1+3+6 =10.


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For M5 1:4:8.

M10 1:3:6.

M15 1:2:4.

M20 1:1.5:3.7. For ensuring quality of concrete, use

A. single sized aggegates

B. two sized aggregate

C. graded aggregates

D. coarse aggregates.

Answer: OptionC

Because if the different size and shape of agg are mixed with each other. The bonding is becomestrong.8. According to I.S. : 456, the number of grades of concrete mixes, is

A. 3 B. 4

C. 5 D. 6

E. 7

Answer: OptionEAccording IS 456-2000.

The number of grades of concrete mixes:M10, M15, M20, M25, M30, M35, M40.9. The mixture of different ingredients of cement, is burnt at

A. 1000C B. 1200C

C. 1400C D. 1600C

E. 1800C

Answer: OptionCCement is burnt 1400-1500 C.10. Pick up the correct statement from the following:

A. Gypsum in cement decreases the setting time

B. The first compound of cement which reacts with water, is C2S

C. Bulking of sand is less when its particles are fine

D. All the above.

Answer: OptionA


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Gypsum not decreases the setting time but it increases (lengthen, retard or slowdown settingtime) suppose cement setting time is 30 min, when we can add gypsum to the cement at the timeof grinding of clinkers then gypsum can slowdown the setting, setting increases from 30 min to60 min it means it cannot decreases the setting time decrease means cement setting is 30 mindecrease means 30 min to 20 min but this is wrong. Right answer is gypsum increases, lengthen,

slowdown setting time of cement.11. The risk of segregation is more for

A. wetter mix

B. larger proportion of maximum size aggregate

C. coarser grading

D. all the above.

Answer: OptionDSegregation can be defined as the separation of the constituent materials of concrete.

12. After casting, an ordinary cement concrete on dryingA. expands

B. mix

C. shrinks

D. none of these.

Answer: OptionCI guess its because water is evaporated and the concrete becomes compact.13. Hydration of cement is due to chemical action of water with

A. Tricalcium silicate and dicalcium silicate

B. Dicalcium silicate and tricalcium aluminate

C. Tricalcium aluminate and tricalcium alumino ferrite

D. All the above.

Answer: OptionD14. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln

at a temperature between

A. 1100 and 1200C

B. 1200 and 1300C

C. 1300 and 1400C

D. 1400 and 1500C

E. 1500 and 1600C


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Answer: OptionDIf we burnt cement with anything, To burnt 1400-1500. Because cement burnt temp 1400-1500c.15. Permissible compressive strength of M 300 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

E. 300 kg/cm2

Answer: OptionEThe grade represents the compressive strength.We know that in M20, M stand to mix and 20 is the characteristic compressive strength ofconcrete, so as in this Q. 300 is the right answer.16. The standard sand now a days used in India, is obtained from

A. Jaipur (Rajasthan)

B. Jullundur (Punjab)

C. Hyderabad (Andhra Pradesh)

D. Ennore (Madras)

E. Cuttuck (Orissa).

Answer: OptionD17. The maximum amount of dust which may be permitted in aggregates is

A. 5% of the total aggregates for low workability with a coarse grading

B. 10% of the total aggregates for low workability with a fine grading

C. 20% of the total aggregates for a mix having high workability with fine grading

D. all the above.

Answer: OptionD18. Proper proportioning of concrete, ensures

A. desired strength and workability

B. desired durability

C. water tightness of the structure

D. resistance to water

E. all the above.

Answer: OptionE


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19. The bulk density of aggregates does not depend upon :

A. size and shape of aggregates

B. specific gravity of aggregates

C. grading of aggregatesD. size and shape of the container

E. none of these.

Answer: OptionD20. Curing

A. reduces the shrinkage of concrete

B. preserves the properties of concrete

C. prevents the loss of water by evaporation

D. all of the above.

Answer: OptionD21. While compacting the concrete by a mechanical vibrator, the slump should not exceed

A. 2.5 cm

B. 5.0 cm

C. 7.5 cm

D. 10 cm

E. 15 cm

Answer: OptionB22. Construction joints are provided

A. where B.M. and S.F. are small

B. where the member is supported by other member

C. at 18 m apart in huge structures

D. in concrete wall at sill level of windows

E. all the above.

Answer: OptionE23. An aggregate is said to be flaky if its least dimension is less than

A. 1/5th of mean dimension

B. 2/5th of mean dimension


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C. 3/5th of mean dimension

D. 4/5th of mean dimension

E. none of these.

Answer: OptionCAnd For Elongated Particles, their Maximum dimension should be larger than 1.8 times of meansize.24. The following proportion of the ingredients of concrete mix, is not in conformation to

arbitrary method of proportioning

A. 1 : 1 : 2

B. 1 : 2 : 4

C. 1 : 3 : 6

D. 1 : 2 : 8E. 1 : 4 : 10

Answer: OptionEBecause we did not seen any where 1:4:10 in our code books.25. The increased cohesiveness of concrete, makes it

A. less liable to segregation

B. more liable to segregation

C. more liable to bleeding

D. more liable for surface scaling in frosty weather

E. none of these.

Answer: OptionAWhen the cohesive property of concrete increases, then there will be chance of generation ofbonding between each particle in concrete, so there will be no chance of segregation (Separationof particles).26. The ratio of the length to breadth of a wooden float, is

A. 4.5 B. 5.5

C. 6.5 D. 7.5E. 8.5

Answer: OptionD27. To ensure constant moisture content in aggregates

A. area of each aggregate pile should be large

B. height of each aggregate pile should not exceed 1.50 m


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C. aggregate pile should be left for 24 hours before aggregates are used

D. conical heaps of aggregates should be avoided to prevent moisture variation

E. all the above.

Answer: OptionE28. Workability improved by adding

A. air-entraining agent

B. foaming agent

C. oily-agent

D. aluminium compound

E. all the above.

Answer: OptionE29. The commonly used material in the manufacture of cement is

A. sand stone

B. slate

C. lime stone

D. graphite.

Answer: OptionC30. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm,

2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weightsretained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate,is

A. 7.30

B. 7.35

C. 7.40

D. 7.45

E. none of these.

Answer: OptionB% RETAINED CUMULATIVE % RETAINED

80 MM 0 0 040 2 10 1020 8 40 5010 6 30 80


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4.75 4 20 1002.36 0 0 1001.18 0 0 100600 0 0 100300 0 0 100

150 0 0 100TOTAL 740.

FINENESS MODULUS = 740/100 = 7.4.

2 out of 20 kg retained in that particular sieve, so for 100 how much is retained give % retainedhence.

(2/20) * 100 = 10(8/20) * 100 = 40

(6/20)* 100 = 30(4/20)*100 = 20. And so on, if u have to find cumulative % retained u have to add the presentlyavailable value with all previous values hence first value is 10.

Second value is 10 + 40 = 50.

Third value is 10+ 40 +30 = 80.

Fourth value is 10+40+30+20 = 100 and so on.31. Curing a concrete for long period ensures better

A. volume stability

B. strength

C. water resistance

D. water tightness and durability

E. all the above.

Answer: OptionE32. For the construction of cement concrete floor, the maximum permissible size of aggregate, is

A. 4 mm

B. 6 mm

C. 8 mm

D. 10 mm

E. 12 mm

Answer: OptionD


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33. The process of proper and accurate measurement of concrete ingredients for uniformity ofproportion, is known

[A]. grading

[B]. curing

[C]. mixing

[D]. batching

[E]. none of these.

Answer: OptionDPick up the correct statement from the following:

A. Insufficient quantity of water makes the concrete mix harsh

B. Insufficient quantity of water makes the concrete unworkableC. Excess quantity of water makes the concrete segregated

D. Excess quantity of water causes bleeding in concrete

E. All the above.

Answer: OptionE35. The preliminary test is repeated if the difference of compressive strength of three test

specimens, exceeds

A. 5 kg/cm2

B. 8 kg/cm2

C. 10 kg/cm2

D. 12 kg/cm2

E. 15 kg/cm2

Answer: OptionE36. Pick up the correct proportions of chemical ingredients of cement

A. Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3

B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3

C. Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3

D. Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

Answer: OptionA37. Transport of concrete by pumps, is done for a distance of


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A. 100 m

B. 200 m

C. 300 m

D. 400 m

E. none of these.

Answer: OptionD38. IfX, YandZare the fineness modulli of course, fine and combined aggregates, the

percentage (P) of fine aggregates to combined aggregates, is

A.

B.

C.

D.

E.

Answer: OptionB39. Slump test is done for

A. clay B. sand

C. lime D. concrete.

Answer: OptionDSlump test is for work ability of concrete.40. The high strength of rapid hardening cement at early stage, is due to its

A. finer grinding

B. burning at high temperature

C. increased lime cement

D. higher content of tricalcium.

Answer: OptionC41. Pick up the correct statement from the following:


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A. The weight of ingredients of concrete mix, is taken in kilograms

B. Water and aggregates are measured in litres

C. The finished concrete is measured in cubic metres

D. 20 bags of cement make one tonne

E. All the above.

Answer: OptionEAggregate & water are measured in litre But other ingredient ?42. Concrete mainly consists of

A. cement

B. aggregates

C. admixture

D. water

E. all the above.

Answer: OptionE43. Vicat's apparatus is used for

A. fineness test

B. consistency test

C. setting time test

D. soundness test

E. compressive strength test.

Answer: OptionB44. M 150 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 :2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

E. none of these.

Answer: OptionB45. Workability of concrete is measured by

A. Vicat apparatus test


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B. Slump test

C. Minimum void method

D. Talbot Richard test.

Answer: OptionB46. The rock which is not calcareous, is :

A. lime stone

B. macl

C. chalk

D. laterite

E. none of these.

Answer: OptionD47. Internal friction between the ingredients of concrete, is decreased by using

A. less water

B. fine aggregates

C. rich mix

D. more water and coarse aggregates

E. none of these.

Answer: OptionD48. For road pavements, the cement generally used, is

A. ordinary Portland cement

B. rapid hardening cement

C. low heat cement

D. blast furnace slag cement

E. none of these.

Answer: OptionB49. Construction joints are generally provided in concrete

A. roads

B. retaining walls

C. lining of canals


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D. lining of tunnels

E. all the above.

Answer: OptionE

Section 2

1. Separation of coarse aggregates from mortar during transportation, is known

A. bleeding

B. creeping

C. segregation

D. shrinkage

E. none of these.

Answer: OptionE

2. According to the recommendations of IS : 456-1978, the expansion joints

A. are provided where plane changes abruptly

B. are provided to ensure minimum resistance

C. are supported on separate columns

D. do not carry reinforcement across them

E. all the above.

Answer: OptionE

3. Grading of sand causes great variation in

A. workability of concrete

B. strength of concrete

C. durability of concrete

D. handing and placing of concrete

E. all the above.

Answer: OptionE


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4. Shrinkage in concrete can be reduced by using

A. low water cement ratio

B. less cement in the concrete

C. proper concrete mix

D. presaturated aggregates

E. all the above.

Answer: OptionE5. Ordinary concrete is not used for concrete grade

A. M 100

B. M 150

C. M 200

D. M 250

E. M 400

Answer: OptionE6. 1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of

A. coarse aggregates

B. fine aggregates

C. neither (a) nor (b)

D. both (a) and (b)

E. none of these.

Answer: OptionD7. Pick up the correct statement from the following:

A.The free water is the amount of water added while mixing and the amount of water

held on the surface of the aggregates prior to mixing

B. The total water is the free water and the amount actually absorbed by the aggregates

C. Neither (a) nor (b)

D. Both (a) and (b).

Answer: OptionD


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8. Addition of pozzolana to ordinary port land cement, causes

A. decrease in early strength

B. reduction in chemical action with sulphates

C. increase in shrinkage

D. reduction bleeding

E. all the above.

Answer: OptionE9. Too wet concrete may cause

A. weakness of concrete

B. excessive laitance

C. segregation

D. lower density

E. all the above.

Answer: OptionE10. Addition of pozzolana to cement causes

A. reduction in permeability

B. loss of heat of hydration

C. reduction in bleeding

D. increase in curing time

E. all the above.

Answer: OptionE11. Hardening of cement occurs at

A.rapid rate during the first few days and afterwards it continues to increase at a

decreased rate

B.slow rate during the first few days and afterwards it continues to increase at a rapidrate

C. uniform rate throughout its age

D. none of these.


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A. Lime in excess, causes the cement to expand and disintegrate

B. Silica in excess, causes the cement to set slowly

C. Alumina in excess, reduces the strength of the cement

D. Magnesium oxide in excess, remains in free state and makes the cement unsound

E. All the above.

Answer: OptionE13. Batching error means inaccuracy in the quantity of

A. aggregates

B. cement

C. water

D. all the above.

Answer: OptionD14. Pick up the correct statement from the following i.

A. Higher workability indicates unexpected increase in the moisture content

B. Higher workability indicates deficiency of sand

C. If the concrete mix is dry, the slump is zero

D. Concrete mix having zero slump, is unsuitable for high strength.

E. All the above.

Answer: OptionE15. You are asked to construct a massive dam, the type of cement you will use, is

A. ordinary Portland cement

B. rapid hardening cement

C. low heat cement

D. blast furnace slag cement

E. white cement.

Answer: OptionC


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Dam construction will involve mass concreting where heat of hydration is the major concernwhich if not monitored will cause crack in the bulk of the dam which is undesirable, hence lowheat cement is preferable in this type of concreting.16. The produce impermeable concrete

A. thorough mixing of concrete is required

B. proper compaction of concrete is required

C. proper curing of concrete is required

D. properly graded and non-porous aggregates are requied

E. all the above.

Answer: OptionE17. Water required per bag of cement, is

A. 7 kg

B. 14 kg

C. 21 kg

D. 28 kg

E. 35 kg

Answer: OptionE18. Pick up the incorrect statement from the following:

A. The bottom and top ends of slump mould are parallel to each other

B. The axis of the mould is perpendicular to the end faces

C. The internal surface of the mould is kept clean and free from set cement

D. The mould is in the form of a frustum of hexagonal pyramid

E. None of these.

Answer: OptionD

19. ISI has specified full strength of concrete after

A. 7 days

B. 14 days

C. 21 days


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D. 28 days

E. none of these.

Answer: OptionE

ISI doesn't specified any strength. That is the IS 456 which specified the strength of concrete.20. For construction of structures in sea water, the cement generally preferred to, is

A. Portland-pozzolana cement

B. quick setting cement

C. low heat Portland cement

D. rapid hardening cement

E. none of these.

Answer: OptionA21. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of

pozzolana cement, is

A. 30% B. 40%

C. 50% D. 60%

E. 70%

Answer: OptionA22. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg

cement, are:

A. 70 litres of sand and 120 litres of aggregates

B. 70 kg of sand and 140 litres of aggregates

C. 105 litres of sand and 140 litres of aggregates

D. 105 litres of sand and 210 litres of aggregates

E. none of these.

Answer: OptionDVolume of one beg cement = 0.035 cum.

Hence sand = 0.035*3 = 0.105 cum.

1 cum = 1000 lt.

So sand = 0.105*1000 = 105 lt.


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& Aggregates = 105*2 = 210 lt.23. The process of hardening the concrete by keeping its surface moist is known

A. placing

B. wetting

C. curing

D. compacting

E. none of these.

Answer: OptionC24. The grade of concrete not recommended by I.S. : 456, is

A. M 100

B. M 200

C. M 300

D. M 400

E. M 500

Answer: OptionE25. C.R.R.I. charts are used to obtain a relatioship between strength of concrete and

A. water cement ratio

B. workability

C. grading of aggregate

D. fineness modulus

E. none of these.

Answer: OptionA26. Proper batching ensures

A. economy

B. durability

C. workability

D. strength


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E. all the above.

Answer: OptionE27. Workability of concrete for a given water content is good if the aggregates, are

A. rounded aggregate

B. irregular aggregate

C. angular aggregate

D. flaky aggregates.

Answer: OptionAIf the round aggregates are used the gap will be form. So, we are using Angular aggregates.28. Pick up the correct statement from the following:

A. Bulking of sand is caused due to formation of a thin film of surface moisture

B. Fine sand bulks more than coarse sand

C. With 10% moisture content by weight, the bulking of sand is increased by 50%.

D. The volume of fully saturated sand, is equal to the volume of dry and loose sand

E. All the above.

Answer: OptionE29. For compacting plain concrete road surface of thickness less than 20 cm, we use

A. internal vibrator

B. screed vibrator

C. form vibrator

D. none of these.

Answer: OptionB29. For compacting plain concrete road surface of thickness less than 20 cm, we use

A. internal vibrator

B. screed vibrator

C. form vibrator

D. none of these.

Answer: OptionB30. Pick up the correct statement from the following:


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A. Construction joints are necessarily planned for their locations

B. Expansion joints are provided to accommodate thermal expansion

C. Construction joints are provided to control shrinkage cracks

D. Expansion joints need not be provided in foundation concrete

E. All the above.

Answer: OptionE

31. Pick up the correct statement from the following:

A. Segregation is necessary for a workable concrete

B. Consistency does not affect the workability of concrete

C. If the slump increases, workability decreases

D. If the concrete mix is dry, the slump is maximum

E. None of these.

Answer: OptionE32. Specified compressive strengh of concrete is obtained from cube tests at the end of

A. 3 days

B. 7 days

C. 14 days

D. 21 days

E. 28 days.

Answer: OptionE32. Specified compressive strengh of concrete is obtained from cube tests at the end of

A. 3 days

B. 7 days

C. 14 days

D. 21 days

E. 28 days.


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Answer: OptionE33. An aggregate is said to be flaky, if its least dimension is less than

A. 2/3 mean dimension

B. 3/4 mean dimension

C. 3/5 mean dimension

D. 5/8 mean dimension

E. none of these.

Answer: OptionC34. Pick up the incorrect statement from the following:

A.A rich mix of concrete possesses higher strength than that a lean mix of desiredworkability with excessive equantity of water

B. The strength of concrete decreases as the water cement ratio increases

C.If the water cement ratio is less than 0.45, the concrete is not workable and causeshoney-combed structure

D. Good compaction by mechanical vibrtions, increases the strength of concrete

E. None of these.

Answer: OptionA35. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M.

6.8 for obtaining the aggregates of F.M. 5.4, is

A. 30% B. 40%

C. 50% D. 60%.

Answer: OptionC36. The final operation of finishing floors, is known as

A. screeding

B. floating

C. trowelling

D. finishing

E. all the above.

Answer: OptionC


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37. The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of pilesis 2.70 m, the maximum number of bags to be stored in two piles, are

A. 1500 bags

B. 2000 bags

C. 2500 bags

D. 3000 bags

E. 4000 bags

Answer: OptionD38. For an ordinary Portland cement

A. residual does not exceed 10% when sieved through IS Sieve No. 9

B. soundness varies from 5 to 10 mm

C. initial setting time is not less than 30 minutes

D. compressive stress after 7 days, is not less than 175 kg/cm2

E. all the above.

Answer: OptionC39. The maximum thickness of concrete floor of a cement warehouse, is

A. 10 cm

B. 15 cm

C. 20 cm

D. 25 cm

E. 30 cm

Answer: OptionD40. A construction joint is provided where

A. bending moment is small

B. shear force is small

C. the member is supported by other member

D. all the above.

Answer: OptionD


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41. The compaction of concrete, improves

A. density

B. strength

C. durability

D. all the above.


A. Water cement paste hardens due to hydration

B. During hardening cement binds the aggregates together

C. Cement provides strength, durability and water tightness to the concrete

D. All the above.

Answer: OptionD43. The light weight aggregates are obtained from

A. sedimentary rocks

B. metamorphic rocks

C. igneous rocks

D. volcanic source.Answer: OptionD44. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully

inundated with water is 12 cm, the bulking of the moist sand, is

A. 10% B. 12%

C. 15% D. 20%

E. 25%.

Answer: OptionE


A.According to the petrological characteristics, concrete aggregates are classified asheavy weight, normal weight and light weight

B.According to the shape of the particles, concrete aggregates are classified as roundedirregular, angular and flaky


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C.According to the surface texture of the particles, the concrete aggregates areclassified as glassy, smooth, granular, rough, crystalline, honey combed and porous

D. All the above.

Answer: OptionDSegregation is responsible for

A. honey-combed concrete

B. porous layers in concrete

C. surface scaling in concrete

D. sand streaks in concrete

E. all the above.

Answer: OptionE47. Addition of pozzolana to cement

A. decreases workability

B. increases strength

C. increases heat of hydration

D. decreases curing time

E. none of these.Answer: OptionE48. The datum temperature for maturity by Plowman, is

A. 23C

B. 0

C. - 5.6C

D. - 11.7C

Answer: OptionD49. Pick up the incorrect statement from the following:

A. The degree of grinding of cement, is calledfineness

B. The process of changing cement paste into hard mass, is known as setting of cement

C. The phenomenon by virtue of which cement does not allow transmission of sound, is


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known assoundness of cement

D.The heat generated during chemical reaction of cement with water, is known asheatof hydration

E. None of these.Answer: OptionC


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Section 3

1. Permissible compressive strength of M 150 concrete grade is

[A]. 100 kg/cm2

[B]. 150 kg/cm2

[C]. 200 kg/cm

[D]. 250 kg/cm2

[E]. 300 kg/cm2

Answer: OptionC

2.

2. Slump test of concrete is a measure ofits

[A]. consistency

[B]. compressive strength

[C]. tensile strength

[D]. impact value.

Answer: Option A

3. Pozzolana cement is used with confidence for construction of

[A]. dams

[B]. massive foundations

[C]. abutments

[D]. R.C.C. structures

[E]. all the above.

Answer: OptionE

4. Water cement ratio is

[A]. volume of water to that of cement

[B]. weight of water to that of cement

[C]. weight of concrete to that of water


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[D]. volume of concrete to that of water

[E]. both (a) and (b) of the above.

Answer: OptionE

5.

Efflorescence in cement is caused due to an excess of

[A]. alumina

[B]. iron oxide

[C]. silica

[D]. alkalis

[E]. magnesium oxide.

Answer: Option D

6. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concreteprovided maximum nominal size of aggregate, does not exceed

[A]. 10 cm

[B]. 15 cm

[C]. 20 cm

[D]. 25 cm

[E]. 30 cm

Answer: OptionC

7. The diameter of the Vicat plunger is 10 mm and its length variesfrom

[A]. 20 mm to 30 mm

[B]. 30 mm to 40 mm

[C].40 mm to 50mm

[D]. 50 mm to 60 mm

[E]. none of these.


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Answer: OptionC

8. The shrinkage of concrete

[A]. is proportional to water content is the mix

[B]. is proportional to cement concrete

[C]. increases with age of concrete

[D].all theabove.

Answer: OptionD

9. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is

[A]. 1 : 2 : 4

[B]. 1 : 3 : 6

[C].1 : : 2

[D]. 1 : 1 : 2

[E]. 4 : 2 : 1

Answer: OptionE

10. Separation of water or water sand cement from a freshly concrete, is known

[A]. bleeding

[B]. creeping

[C]. segregation

[D]. flooding

[E]. none of these.

Answer: OptionA

11. Slump test of concrete is a meausre ofits


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[A]. consistency

[B]. compressive strength

[C]. tensile strength

[D]. impact value.

Answer: OptionA

12. Tricalcium aluminate (C3A)

[A]. reacts fast with water

[B].generates less heat ofhydration

[C]. causes initial setting and early strength of cement

[D]. does not contribute to develop ultimate strength

[E]. none of these.

Answer: OptionB

13. According to Water-Cement Ratio Law, the strength of workable plastic concrete

[A]. depends upon the amount of water used in the mix

[B]. does not depend upon the quality of cement mixed with aggregates

[C]. does not depend upon the quanity of cement mixed with aggregates

[D]. all the above.

Answer: OptionD

14. Pick up the incorrect statement from the following:

[A]. In properly graded aggregates, bulk density is more

[B]. In single size aggregates, bulk density is least

[C]. In single size aggregates, bulk density is maximum

[D]. None of these.


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Answer: OptionC

15. Saw dust can be rendered chemically inert by boiling it in water containing

[A].ferrous

sulphate

[B]. potassium chloride

[C]. ammonia

[D]. nitric acid

[E]. sulphuric acid.

Answer: OptionA


[A]. High percentage of C3S and low percentage of C2S cause rapid hardening

[B].High percentage of C3S and low percentage of C2S make the cement less resistiveto chemical attack

[C]. Low percentage of C3S and high percentage of C2S contribute to slow hardening

[D].Low percentage of C3S and high percentage of C2S provide greater resistance tochemical attack

[E].All theabove.

Answer: OptionE

17. The factor which affects workability, is

[A]. water content and its temperature

[B]. shape and size of the aggregates

[C]. grading and surface textures of the aggregates

[D]. air entraining agents

[E].all theabove.


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Answer: OptionE

18. The cement whose strength is a little lower than the ordinary cement during the first threemonths but attains afterwards the same strength, is known as

[A]. low-heat Portlandcement

[B]. rapid hardening Portland cement

[C]. Portland blast slag cement

[D]. Portland pozzolana cement

[E]. none of these.

Answer: OptionA


[A]. Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones

[B]. Concrete using sand stones, cracks due to excessive shrinkage

[C].Very hard and close grained crystallined lime stones are suitable aggregates butprovide low strength

[D]. Broken bricks produce a concrete having good fire resisting qualities

[E].All theabove.

Answer: OptionE


[A]. Water enables chemical reaction to take place with cement

[B]. Water lubricates the mixture of gravel, sand and cement

[C]. Only a small quantity of water is required for hydration of cement

[D]. Strength of concrete structure largely depends upon its workability

[E].All theabove.


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Answer: OptionE

21. Pick up the incorrect statement applicable to the field test of good cement.

[A]. When one thrusts one's hand into a bag of cement, one should feel warm

[B]. The colour of the cement is bluish

[C]. A handful of cement thrown into a bucket of water should sink immediately

[D]. By rubbing cement in between fingers, one should feed rough

[E].All theabove.

Answer: OptionE


[A]. Calcium chloride acts as a retarder

[B]. Gypsum (calcium sulphate) acts as an accelerator

[C]. Gypsum (calcium sulphate) acts as a retarder

[D]. Calcium chloride acts as an accelerator

[E].

Both (c) and

(d).

Answer: OptionE

23. Joints in concrete structures, are provided

[A]. to reduce the tensile stresses likely to be developed due to evaporation of water

[B]. to minimise the change in the dimensions of the slab

[C]. to minimise the necessary cracking

[D].all theabove.

Answer: OptionD

24. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, theoutput of a concrete mixer of 150 litre capacity, is


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[A]. 15, 900 litres

[B]. 16, 900 litres

[C]. 17, 900 litres

[D].18, 900litres

Answer: OptionD

25. The condition not applicable to water cement ratio law, is

[A]. internal moisture conditions on hydration continue till complete strength is gained

[B].concrete specimens may be tested at anytemperature

[C]. concrete specimens need be of same age

[D]. concrete specimens need be of same size

[E]. none of these.

Answer: OptionB

26. High temperature

[A]. increases the strength of concrete

[B].decreases the strength ofconcrete

[C]. has no effect on the strength of concrete

[D]. none of these.

Answer: OptionB

27. The bulk density of aggregates, is generally expressed as[A]. tonnes/cubic metre

[B]. kg/cubic metre

[C]. kg/litre


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[D]. g/cm3

[E]. none of these.

Answer: OptionC

28. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days,is

[A]. 100 kg/cm2

[B].150kg/cm2

[C]. 200 kg/cm2

[D]. 250 kg/cm

2

[E]. 300 kg/cm2

Answer: OptionB

29. Allowable shear strength of concrete, depends upon

[A]. shear strength

[B]. tensile strength

[C]. compressive strength

[D]. none of these.

Answer: OptionA

30. The most useless aggregate is one whose surface texture is

[A]. smooth

[B]. granular

[C]. glassy

[D]. honey combed and porous.

Answer: OptionC


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31. To obtain a very high strength concrete, use very fine grained

[A]. Granite

[B]. Magnetite

[C]. Barite

[D]. Volcanic scoria.

Answer: OptionA

32. Concrete containing

[A]. silicious aggregates, has higher co-efficient of expansion

[B]. igneous aggregates, has intermediate coefficient of expansion

[C]. lime stones, has lowest co-efficient of expansion

[D].All theabove.

Answer: OptionD

33. An ordinary Portland cement when tested for its fineness, should not leave any residue onI.S. seive No. 9, more than

[A]. 5% [B]. 10%

[C]. 15% [D]. 20%

[E]. 25%

Answer: OptionB

34. The top diameter, bottom diameter and the height of a slump mould are :

[A].10 cm, 20 cm, 30cm

[B]. 10 cm, 30 cm, 20 cm

[C]. 20 cm, 10 cm, 30 cm

[D]. 20 cm, 30 cm, 10 cm


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[E]. 30 cm, 20 cm, 10 cm

Answer: OptionA

35. Workability of concrete mix with low water cement ratio is determined by[A]. tensile strength test

[B]. slump test

[C].compaction factortest

[D]. flexural strength test

[E]. none of these.

Answer: OptionC

36. While designing an air entrained concrete

[A]. water cement ratio is reduced

[B]. proportion of aggregates is reduced

[C]. an allowance for the entrained air is made

[D]. strength of the concrete, is reduced

[E].all theabove.

Answer: OptionE

37. Pick up the incorrect statemnt from the following. For performing compressive strength testof cement

[A].cement and standard sand mortar are used in theratio of 1 : 3

[B]. water is added at the rate of + 3.0 percentage of water whereP is thepercentage of water for standard consistency

[C]. A cube mould of 10 cm x 10 cm x 10 cm is used

[D]. The perpared moulds are kept in a atmosphere of 50% relative humidity


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[E].The temperature of water in the submerged tank for curing moulds, should be 27 2C.

Answer: OptionA

38. For concreting tunnel linings, tran-portation of concrete is done by

[A]. pans

[B]. wheel borrows

[C]. containers

[D]. pumps

[E]. belt conveyors.

Answer: OptionD

39. The operation of removing humps and hollows of uniform concrete surface, is known as

[A]. floating

[B]. screeding

[C]. trowelling

[D]. finishing

[E]. none of these.

Answer: OptionB

40. The void ratio of

[A]. single size coarse aggregate is roughly 0.45.

[B]. graded coarse aggregate is roughly 0.040

[C]. fine aggregate is roughly 0.45

[D].all theabove.

Answer: OptionD


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41. The type of aggregates not suitable for high strength concrete and for pavements subjected totension, is

[A].roundedaggregate

[B]. irregular aggregate

[C]. angular aggregate

[D]. flaky aggregate

[E]. none of these.

Answer: OptionA

42. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix

used, is[A]. 1 : 3 : 6

[B].1 : : 3

[C]. 1 : 2 : 4

[D]. 1 : 1 : 2

[E]. 1 : 4 : 8.

Answer: OptionC

43. The type of aggregates of same nominal size, which contain less voids when compacted, are

[A].roundedspherical

[B]. irregular

[C]. flaky

[D]. none of these.

Answer: OptionA

44. For the construction of cement con-certe dams, the maximum permissible size of theaggregates, is


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[A].40mm

[B]. 50 mm

[C]. 60 mm

[D]. 70 mm

[E]. 80 mm

Answer: OptionA


[A]. 100 kg/cm2

[B]. 150 kg/cm2

[C]. 200 kg/cm2

[D]. 250 kg/cm

[E]. 300 kg/cm2

Answer: OptionD

46. For preparing a test-specimen, it is necessary[A]. to mix cement and fine aggregate by dry hand

[B]. to mix coarse aggregates

[C]. to mix water to the cement, fine aggregates and coarse aggregates

[D]. to oil inner surface of the mould and the base plate, before placing concrete

[E]. all the above.

Answer: OptionE

47. The aggregate containing moisture in pores and having its suface dry, is known as

[A]. moist aggregates

[B]. very dry aggregates


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[C]. dry aggregates

[D].saturated surface dryaggregate

[E]. none of these.

Answer: OptionD

48. The commercial name of white and coloured cement in India, is

[A]. colocrete

[B]. rainbow cement

[C]. silvicrete

[D]. snowcem

[E]. all the above.

Answer: OptionE


[A].An increase in water content must be accompanied by an increase in cementcontent

[B]. Angular and rough aggregates reduce the workability of the concrete

[C]. Large size aggregates increase the workability due to lesser surface area

[D]. The slump of the concrete mix decreases due to an increase in temperature

[E]. All the above.

Answer: OptionE

50. To hydrate 500kg of cement full water needed, is[A]. 100 kg

[B]. 110 kg

[C]. 120 kg


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[D]. 130 kg

[E]. 140 kg

Answer: OptionD

Section 4

1. Concrete gains strength due to

[A]. chemical reaction of cement with sand and coarse aggregates

[B]. evaporation of water from concrete

[C]. hydration of cement

[D]. All the above.

Answer: OptionC

2. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve ofsize 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

[A]. 20.5 mm

[B]. 30.5 mm

[C]. 40.5 mm

[D]. 50.5 mm

[E]. none of these.

Answer: OptionC

Explanation:60+75 = 135.

135/2 = 67.5.

3/5*67.5 = 40.5.

3. Non-uniform compaction may cause the concrete

[A]. porous


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[B]. non-homogeneous

[C]. reduced strength

[D]. all the above.

Answer: OptionD

4. Log Angles machine is used to test the aggregate for

[A]. crushing strength

[B]. impact value

[C]. abrasion resistance

[D]. water absorption

[E]. none of these.

Answer: OptionC

5. If fineness modulus of sand is 2.5, it is graded as

[A]. very fine sand

[B]. fine sand

[C]. medium sand

[D]. coarse sand

[E]. very coarse sand.

Answer: OptionB

6. Pozzolanic properties exist in

[A]. shales

[B]. fly ash

[C]. pumicite

[D]. diatomaceous clay


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[E]. all the above.

Answer: OptionE

7. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is saidto be flaky if its least dimension is less than

[A]. 22.5 mm

[B]. 18.5 mm

[C]. 16.5 mm

[D]. 15.5 mm

[E]. 13.5 mm.

Answer: OptionE

8. Expansion joints are provided if the length of concrete structures exceeds

[A]. 10 m

[B]. 15 m

[C]. 15 m

[D]. 35 m

[E]. 45 m

Answer: OptionE

9. Workability improved by adding

[A]. fly ash

[B]. hydrated lime

[C]. calcium chloride

[D]. bentonite

[E]. all the above.

Answer: OptionE


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Explanation:

Bentonite reduces the workability.

10. If the slump of a concrete mix is 60 mm, its workability is

[A]. very low

[B]. low

[C]. medium

[D]. high

[E]. none of these.

Answer: OptionC


[A]. Sand obtained from pits, is washed to remove clay and silt

[B]. Sand obtained from flooded pits, need not be washed before use

[C]. Sea shore sand contains chlorides which cause effloresance

[D].The chloride in sea shore sand and shingle may cause corrosion of reinforcement ifthe concrete is porous

[E]. All the above.

Answer: OptionE

12. The strength and quality of concrete, depend upon:

[A]. grading of aggregates

[B]. surface area of aggregates

[C]. shape of aggregates

[D]. surface texture of aggregates

[E].all theabove.

Answer: OptionE


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13. The process of mixing, transporting, placing and compacting concrete using Ordinary Portland Cement should not take more than

[A].30minutes

[B]. 40 minutes

[C]. 60 minutes

[D]. 75 minutes

[E]. 90 minutes.

Answer: OptionA

14. Pick up the incorrect statement from the following. While performing preliminary test on

concrete

[A].proportions of the material and water should be the same as to be used at the worksite

[B]. cement should be mixed by hand in order to maintain uniformity

[C]. concrete mix should be stored in air-tight containers

[D].concrete ingredients should be kept at a temperatureof 37 2C

[E]. none of these.

Answer: OptionD

15. Sand requiring a high water cement ratio, belongs to

[A]. Zone I

[B]. Zone II

[C]. Zone III

[D]. Zone IV.

Answer: OptionA

16. Ordinary Portland cement is manufactured from


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[A]. lime stone and clay

[B]. gypsum and lime

[C]. pozzolana

[D]. lime, pozzolana and clay.

Answer: OptionBExplanation:

Option B may be correct but one should also bear in the mind that for ordinary cement concretethere are two important ingredients

1) argillaceous.

2) calcareous.

17. A flaky aggregate is said to be elongated if its length is

[A]. equal to the mean size

[B]. twice the mean size

[C]. thrice the mean size

[D]. four times the mean size

[E]. five times the mean size.

Answer: OptionB

18. To prevent segregation, the maximum height for placingconcrete, is

[A].100cm

[B]. 125 cm

[C]. 150 cm

[D]. 200 cm

[E]. 250 cm

Answer: OptionA


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19. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6,the grade of concrete, is

[A]. M 100

[B]. M 150

[C]. M 200

[D]. M 250

[E]. M 300

Answer: OptionA

20. Water cement ratio is generally expressed in volume of water required per

[A]. 10 kg

[B]. 20 kg

[C]. 30 kg

[D]. 40 kg

[E]. 50 kg

Answer: OptionE

21. For a good concrete

[A]. aggregates should be hard and durable

[B]. cement should be sufficient to produce the required strength

[C]. water should be free from organic materials

[D]. mixing of ingredients should be done thoroughly so as to produce homogeneity

[E]. All the above.

Answer: OptionE

22. If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permittedis 270 cm, the number of cement bags to be stored, is


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[A]. 2000 bags

[B]. 2200 bags

[C]. 2400 bags

[D]. 2700 bags

[E]. 3000 bags

Answer: OptionD

23. Gypsum is added for

[A]. colour

[B]. strength

[C]. controlling setting time

[D]. none of these.

Answer: OptionC

24. A concrete having a slump of 6.5 cm, is said to be

[A]. dry

[B]. earth moist

[C]. semi-plastic

[D]. plastic

[E]. none of these.

Answer: OptionD

25. Strength of concrete with passage of time

[A]. increases

[B]. decreases

[C]. fluctuates


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[D]. remains constant.

Answer: OptionA

26. Cement used for normal concrete construction, is obtained by burning a mixture of[A]. silicious and argillaceous materials

[B]. argilaceous and calcareous materials

[C]. silicious and catcareous materials

[D].silicious, argillaceous and calcareousmaterials

[E]. none of these.

Answer: OptionD


[A]. The concrete gains strength due to hydration of cement

[B]. The concrete cured at a temperature below 23C, gains strength up to 28 days

[C]. The concrete does not set at freezing point

[D]. The strength of concrete increases with its age

[E].All theabove.

Answer: OptionE


[A].Admixtures acceleratehydration

[B].Admixtures make concrete water proof

[C]. Admixtures make concrete acid proof

[D]. Admixtures give high strength

[E]. None of these.


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Answer: OptionA

29. Higher workability of concrete is required if the structure is

[A]. made with cement concrete

[B]. thick and reinfored

[C]. thin and heavily reinforced

[D].thick and heavilyreinfored.

Answer: OptionD

30. Setting time of cement decreases by adding

[A]. gypsum

[B]. hydrogen peroxide

[C]. calcium chloride

[D]. sodium oxide

[E]. none of these.

Answer: OptionA

31. The dimensions of a 35 litre forma for measuring aggregates by volume, are :

[A]. length 30 cm, breadth 25 cm, height 30 cm

[B]. length 39 cm, breadth 25 cm, height 32 cm

[C]. length 27 cm, breadth 27 cm, height 48 cm

[D]. length 220 cm, breadth 25 cm, height 40 cm

[E]. none of these.

Answer: OptionC

32. The shuttering of a hall measuring 4 m x 5 m, can be removed after

[A]. 5 days


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[B]. 7 days

[C]. 10 days

[D]. 14 days

[E]. 21 days

Answer: OptionB


[A]. There should not be any loss of cement from the charged drum of the mixer

[B]. Cement should be mixed for at least one minute

[C]. 10% of water is placed in the rotating drum before adding dry material

[D]. 10% of water is added after placing the other ingredients in the drum

[E].All theabove.

Answer: OptionE

34. If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whosewater cement ratio is 0.6, the weight of water required for harsh mix, is

[A]. 8 kg

[B]. 10 kg

[C]. 12 kg

[D]. 14 kg

[E]. 15 kg.

Answer: OptionC

35. The entrained air in concrete

[A].increasesworkability

[B]. decreases workability


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[C]. decreases resistance to weathering

[D]. increases strength

[E]. neither affects workability nor strength.

Answer: OptionA


[A]. Tricalcium silicate (C3S) hydrates rapidly

[B]. Tricalcium silicate (C3S) generates more heat of hydration

[C]. Tricalcium silicate (C3S) develops early strength

[D]. Tricalcium silicate (C3S) has more resistance tosulphate attack

[E]. None of these.

Answer: OptionD


[A]. 100 kg/cm2

[B]. 150 kg/cm

[C]. 200 kg/cm2

[D]. 250 kg/cm2

[E]. 300 kg/cm2

Answer: OptionB

38. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm

diameter for[A]. 20 times

[B]. 25 times

[C]. 30 times


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[D]. 40 times

[E]. 50 times

Answer: OptionB


[A].The diameter of the pipe line used for transportation of concrete by pumps does notexceed 30 cm

[B].The slump of the concrete to be pumped, should not be less that 5 cm and morethan 8 cm

[C]. The water cement ratio of concrete to be pumped is kept between 0.5 to 0.65

[D]. Number of bends provided in the pipe line should be minimum (e) All the above.

Answer: OptionE

40. If the average compressive strength is 4000 kg/cm and standard deviation is 500, the co-efficient of variation is

[A]. 10%

[B]. 12.5%

[C]. 15%

[D]. 18.5 %

[E]. 20%

Answer: OptionB

Explanation:Co-efficient of variation:

500/4000 =0 .125*100 = 12.5.

41. For preparing ordinary concrete, the quantity of water used, is

[A]. 5% by weight of aggregates plus 20% of weight of cement

[B]. 10% by weight of aggregates plus 10% of weight of cement


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[C]. 5% by weight of aggregates plus 30% of weight of cement

[D]. 30% by weight of aggregates plus 10% of weight of cement

[E]. none of these.

Answer: OptionC

42. Setting time of cement increases by adding

[A]. gypsum

[B]. calcium chloride

[C]. sodium oxide

[D]. calcium sulphate

[E]. none of these

Answer: OptionB

43. According to IS : 382-1963, a good aggregate should be

[A]. chemically inert

[B]. sufficiently strong

[C]. hard and durable

[D]. all the above.

Answer: OptionD

44. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm forgravity dams should be

[A]. between 150 to 300 kg/cm2

[B]. between 350 to 600 kg/cm2

[C]. between 150 to 500 kg/cm2

[D].below 200kg/cm2


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[E]. none of these.

Answer: OptionD

45. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetivelyand W/C is the water cement ratio, the minimum quantity of water to be added to first batch,is obtained by the equation

[A]. 0.1P + 0.3Y+ 0.1Z=W/CxP

[B].0.3P + 0.1Y+0.01Z=W/CxP

[C]. 0.4P + 0.2Y+ 0.01Z=W/CxP

[D]. 0.5P + 0.3Y+ 0.01Z=W/CxP

[E]. 0.2P + 0.5Y+ 0.1Z=W/CxP

Answer: OptionB

46. For the construction of thin R.C.C. structures, the type of cement to be avoided, is

[A]. ordinary Portland cement

[B]. rapid hardening cement

[C]. low heat cement

[D]. blast furnace slag cement

[E]. sulphate resisting cement.

Answer: OptionD

47. Vicat apparatus is used for

[A]. fineness test

[B]. consistency test

[C]. test for setting time

[D]. test for tensile strength

[E]. none of these.


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Answer: OptionB


[A]. Space between the exterior walls of a warechouse and bag piles should be 30 cm

[B]. Cement bags should preferably be piled on wooden planks

[C].Cement bags should be placed such that bags of one layer does not touch the bagsof the adjacent layer

[D]. Width and height of the pile should not exceed 3 m and 2.70 m respectively

[E]. None of these.

Answer: OptionE

49. For the construction of the retaining structures, the type of concrete mix to be used, is

[A]. 1 : 3 : 6

[B]. 1 : 2 :4

[C].1 : : 3

[D]. 1 : l : 2

[E]. 1 : 4 : 8.

Answer: OptionC

50. An ideal ware house, is provided

[A]. water proof masonry walls

[B]. water proof roof

[C]. few windows which remain generally closed

[D]. 15 cm thick concrete floor laid on a dry course of soling

[E].all theabove.

Answer: OptionE


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Section 5

1. Concrete is unsuitable for compaction by a vibrator if it is

[A]. dry

[B]. earth moist

[C]. semi-plastic

[D]. plastic

[E]. none of these.

Answer: OptionD

2. Inert material of a cement concrete mix, is

[A]. water

[B]. cement

[C]. aggregate

[D]. none of these.

Answer: OptionC

Explanation:The aggregates chosen for mix should be inert (not reacting with any other substances). Howeverit is the skeleton form of the Concrete. It plays crucial role in strength of concrete.

3. Sands of zone I are

[A]. coarse

[B]. medium

[C]. medium to fine

[D]. fine.

Answer: OptionA


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The lower water cement ratio in concrete, introduces

[A]. smaller creep and shrinkage

[B]. greater density and smaller permeability

[C]. improved frost resistance

[D]. greater wear resistance and improved bond strength

[E]. all the above.

Answer: Option E

5. The cement becomes useless if its absorbed moisture content exceeds

[A]. 1% [B]. 2%

[C]. 3% [D]. 4%

[E]. 5%

Answer: OptionE

6. A concrete using an air entrained cement

[A]. has strength less than 10% to 15%

[B]. has more resistance to weathering

[C].is more plastic andworkable

[D]. is free from segregation and bleeding

[E]. all the above.

Answer: OptionC


[A]. The maximum size of a coarse aggregate, is 75 mmand minimum 4.75 mm

[B].The maximum size of the fine aggregate, is 4.75 mmand minimum 0.075 mm

[C]. The material having particles of size varying from


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0.06 mm to 0.002 mm, is known as silt

[D].The material having particles of size less than 0.002mm, is known as clay

[E]. All the above.

Answer: OptionE

8. Placing of concrete should preferably be done at a temperature of

[A]. 0C

[B]. 10C

[C]. 20C

[D]. 23C

[E].27 2C

Answer: OptionE

9. The aggregate impact value of the aggregate used in

[A]. building concrete is less than 45

[B]. road pavement concrete is less than 30

[C]. runway concrete is less than 30

[D]. all the above.

Answer: OptionD

10. The maximum percentage of chemical ingredient of cement is that of

[A]. magnesium oxide

[B]. iron oxide

[C]. aluminium

[D]. lime


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[E]. silica.

Answer: OptionD

11. Pick up the incorrect statement from the following:[A]. Workability of the concrete mix decreases with an increase in the moisture content

[B]. Concrete for which preliminary tests are conducted, is called controlled concrete

[C]. Bulking of sand depends upon the fineness of grains

[D]. Concrete mix 1 : 6 : 12, is used for mass concrete in piers.

[E]. All the above.

Answer: OptionE

12. Sand generally contains salt if it is obtained from:

[A]. nala beds

[B]. river beds

[C]. sea beds

[D]. all the above

[E]. none of these.

Answer: OptionC

13. The impurity of mixing water which affects the setting time and strength of concrete, is

[A]. sodium sulphates

[B]. sodium chlorides

[C]. sodium carbonates andbicarbonates

[D]. calcium chorides

[E]. calcium bicarbonates

Answer: OptionC


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[A]. Continuous grading is not necessary for obtaining a minimum of air voids

[B].

The omission of a certain size of aggregate is shown by a straight horizontal line on

the grading curve

[C].The omission of a certain size of aggregate in concrete increases the workabilitybut also increases the liability to segregation

[D].All theabove.

Answer: OptionD

15. Di-calcium silicate (C2S)

[A]. hydrates rapidly

[B].generates less heat ofhydration

[C]. hardens rapidly

[D]. provides less ultimate strength to cement

[E]. has less resistance to sulphate attack.

Answer: OptionB

16. On a grading curve, the gap grading is represented by

[A]. a horizontal line

[B]. a vertical line

[C]. N.W. inclined line

[D]. N.E. inclined line

[E]. none of these.

Answer: OptionA

17. Bulking of sand is


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[A]. mixing of different sizes of sand particles

[B]. mixing of lime with sand

[C]. maximum water with sand

[D]. swelling of sand when wetted.

Answer: OptionD

18. Curing of pavements, floors, roofs and slabs, is done by

[A]. membrane method

[B].pondingmethod

[C]. covering surface with bags

[D]. sprinkling water method

[E]. shading concrete method.

Answer: OptionB


[A].

With passage of time, the strength of

cement increases

[B]. With passage of time, the strength of cement decreases

[C]. After a period of 24 months, the strength of cement reduces to 50%

[D]. The concrete made with storage deteriorated cement, gains strength with time

[E]. None of these.

Answer: OptionA

20. The surface where two successive placements of concrete meet, is known as

[A]. Contraction joint

[B]. Expansion joint

[C]. Construction


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oint

[D]. both (a) and (b)

[E]. both (6) and (c).

Answer: OptionC

21. An excess of flaky particles in concrete aggregates

[A]. decreases the workability

[B]. increases the quantity of water and sand

[C]. affects the durability of concrete

[D]. more than 15% are not desirable

[E].all theabove.

Answer: OptionE

22. 1.S.I. has specified the full strength of concrete after

[A]. 7 days

[B]. 14 days

[C]. 21 days

[D]. 28 days

[E]. 35 days

Answer: OptionD

23. For given workability the grading requiring the least amount of water is one that gives

[A]. greatest surface area for the given cement andaggregates

[B]. least surface area for the given cement and aggregates

[C]. least weight for the given cement and aggregates

[D]. greatest weight for the given cement and aggregates


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[E]. none of these.

Answer: OptionA

24. The minimum percentage of chemical ingredient of cement is that of[A].

magnesiumoxide

[B]. iron oxide

[C]. alumina

[D]. lime

[E]. silica.

Answer: OptionA

25. The specifications of a cement bag for storage, are

[A]. weight 50 kg

[B]. height 18 cm

[C]. plan area 3000 sq. cm

[D]. volume 35 litres

[E]. all the above.

Answer: OptionE

26. The bulk density of aggregates, depends upon

[A]. shape

[B]. grading

[C]. compaction

[D]. all the above.

Answer: OptionD



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[A].The bulk density of fine aggregate is usually about 10 per cent more than that ofcoarse aggregate of similar composition

[B].The specific gravity of aggregate is important for the determination of the moisturecontent

[C]. The absorption and porosity of an aggregate influence the property of the concrete

[D]. A highly absorptive aggregate reduces the workability of concrete considerably

[E]. All the above.

Answer: OptionE

28. Horizontal construction joints in concrete walls are generally provided at

[A]. soffit level

[B]. window sill level

[C]. floor level

[D]. all the above.

Answer: OptionD


[A]. Construction joints in columns are provided a few cm below the junction of beam

[B]. Construction joints in columns are provided at the bottom haunching

[C]. Construction joints in beams and slabs are provided within middel third

[D]. Constructionjoints are generally provided in positions subjected to least shear force

[E]. All the above.

Answer: OptionE

30. For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of waterrequired per bag, is

[A]. 10 kg

[B]. 12 kg


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[C].14kg

[D]. 16 kg

[E]. 20 kg

Answer: OptionC

31. The concrete mix which causes difficulty in obtaining a smooth finish, possess

[A]. segregation

[B]. internal friction

[C]. hardness

[D]. bleeding

[E]. none of these.

Answer: OptionC

32. Le-Chatelier's apparatus is used for testing

[A]. soundness of cement

[B]. hardness of cement

[C]. strength of cement

[D]. durability of cement.

Answer: OptionA

33. 'Ware house pack' of cement means

[A]. full capacity of the ware house

[B]. pressure exertion of the bags of upper layers

[C]. pressure compaction of the bags on lower layers

[D]. packing the ware house

[E]. none of these.


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Answer: OptionC

34. In the method of voids for determination of the quantity of cement paste, it is assumed that

[A]. Voids in coarse aggregates are filled by fine aggregates

[B]. Voids in fine aggregates are filled by the cement paste

[C].Volume of fine aggregates is equal to total voids in coarse aggregates plus 10%extra

[D].Volume of cement paste required is equal to total volume of voids in fineaggregates plus 15% extra

[E].All theabove.

Answer: OptionE

35. If a grading curve is horizontal bet-wen the portions of 20 mm I.S. Sieve and 4.75 mm I.S.Sieve, the graded aggregates do not contain

[A]. 20 mm particles

[B]. 10 mm particles

[C]. 4.75 mm particles

[D]. all the above.

Answer: OptionD

36. The size of fine aggregates does not exceed

[A]. 2.75 mm

[B]. 3.00 mm

[C]. 3.75 mm

[D]. 4.75 mm

[E]. 5.75 mm

Answer: OptionD


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37. An aggregate is known as cyclopean aggregate if its size is more than

[A]. 4.75 mm

[B]. 30 mm

[C]. 60 mm

[D]. 75 mm

[E]. 90 mm.

Answer: OptionD

38. The main object of compaction of concrete, is:

[A]. to eliminate air holes

[B]. to achieve maximum density

[C]. to provide initimate contact between the concrete and embedded materials

[D].all theabove.

Answer: OptionD


[A]. The quality of water governs the strength of concrete

[B].The quantity of water required for concreting, depends upon the grading ofaggregate amd method of compaction

[C]. 10% excess of water reduces the strength of concrete by 15%

[D]. 30% excess of water reduces the strength of concrete by 50%

[E]. All the above.

Answer: OptionE

40. Particles of 0.002 mm size are that of

[A]. clay

[B]. sand


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[C]. gravel

[D]. none of these.

Answer: OptionA

Hydraulics

SECTION1

1. A pitot tube is used to measure

[A]. pressure

[B]. difference in pressure

[C]. velocity offlow

[D]. none of these.

Answer: OptionC

Explanation:

Pitot tube is used for to find out the velocity of the flow pipes or soil etc.

2. The thickness of a sharp crested weir is kept less than

[A]. one-third of the height of water on the sill

[B].one-half of the height of water onthe sill

[C]. one-fourth of the height of water on the sill

[D]. two-third of the height of water on the sill

[E]. none of these.

Answer: OptionB

3. The property of steam function is :

[A]. is constant everwhere on any stream line


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[B]. the flow around any path in the fluid is zero for continuous flow

[C].the rate of change of with distance in an arbitrary direction, is proportional to thecomponent of velocity normal to that direction

[D]. the velocity vector may be found by differentiating the stream function

[E].all theabove.

Answer: OptionE

4. The maximum vacuum created at the summit of a syphon is

[A]. 2.7 m of water

[B]. 7.4 m ofwater

[C]. 5.5 m of water

[D]. none.

Answer: OptionB

5. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm , thepressure at a depth of 2.5 m, is

[A]. 1 metre of water

[B]. 2 metres of water

[C].3 metres ofwater

[D]. 3.5 metres of water

[E]. 4.0 metres of water.

Answer: OptionC

6. The total pressure force on a plane area is equal to the area multiplied by the intensity ofpressure at its centroid, if


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[A]. area is horizontal

[B]. area is vertical

[C]. area is inclined

[D]. all the above.

Answer: OptionD

7. If the volume of a liquid weighing 3000 kg is 4 cubic metres,0.75 is its

[A]. specific weight

[B]. specific mass

[C].specificgravity

[D]. none of these.

Answer: OptionC

Explanation:

Density of liquid = m/v = 3000/4 = 750kg/m3

Density of liquid/density of water = 750/1000 = 0.75 = specific gravity.

8. Bernoulli's equation assumes that

[A]. fluid is non-viscous

[B]. fluid is homogeneous

[C]. flow is steady

[D]. flow is along the stream line

[E]. all the above.

Answer: OptionE


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9. The time required to close a valve gradually is (whereL is the length of pipe andC= velocityof pressure wave)

[A].

[B].

[C].>

[D]. 1

[D]. none of these.

Answer: OptionC

15. A critical hydraulic gradient may occur when

[A]. flow is in upward direction

[B]. seepage pressure is in upward direction

[C]. effective pressure is zero

[D]. all the above.

Answer: OptionD

16. Plasticity index is defined as the range of water content between

[A]. liquid and plastic limit


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[B]. plastic limit and semi solid limit

[C]. semi-solid limit and liquid limit

[D]. liquid limit and solid limit.

Answer: OptionA

17. The minimum depth of building foundations on

[A]. sandy soils is 80 cm to 100 cm

[B]. clay soils is 90 cm to 160 cm

[C]. rocky soils is 5 cm to 50 cm

[D]. all the above.

Answer: OptionD

18. The ratio of the undrained strength in the undrained state to the undrained strength, at thesame water content, in the remoulded state, is called the sensivity of the clay. Its value forquick clays is

[A]. 4 [B]. 8

[C]. 12 [D]. 16

[E]. 20

Answer: OptionE

19. The total weight of a pycnometer with water and oven dried soil 20 (g) is 1600 g. Thepycnometer filled with water alone weighs 1500 g. The specific gravity of the soil, is

[A]. 1.0 [B]. 1.5

[C]. 2.0 [D]. 2.5

Answer: OptionC

20. The consolidation time for soils

[A]. increases with increasing compressibility

[B]. decreases with increasing permeability


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[C]. increases rapidly with increasing size of soil mass

[D]. is independent of the magnitude of the stress change.

[E]. All the above.

Answer: OptionE

21. The zero atmospheric pressure is at

[A]. sea level

[B]. mean sea level

[C]. water table

[D]. phreatic surface

[E]. both (c) and (d) of the above.

Answer: OptionE

22. A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that ofparaffin 0.9, the void ratio of soil, is

[A]. 0.55 [B]. 0.60

[C]. 0.65 [D]. 0.70

Answer: OptionB

Explanation:

Parffin volume = 10/(0.9*1.0) = 11.11 cc (1.0 - density of water).

Vol.of Soil = (460-10) /(2.5*1.0) = 180 cc.

Vol.of Soil = 299 -11.11 = 287.89 cc.

Vol.of Voids = 287.89 - 180 = 107.89 cc.

Void Ratio = Vol.Voids / Vol os Soilds = 107.89/180 = 0.60.

23. Pick up the incorrect definition from the following:

[A]. Ratio of the compressive strength of unconfined undisturbed soil to that of


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remoulded soil, is known as the sensitivity of the soil sample

[B].The rotation of soil particles into stable state while remoulding, is known as thethiostropy of soil

[C]. The water content at which a soil changes from the liquid state to solid state, isknown liquid limit of the soil

[D]. The water content at which a soil flows, is known plastic limit of the soil

[E]. None of these.

Answer: OptionD

24. In a fow net

[A]. flow lines and equipotential lines cross eachother at right angles

[B]. fields are rectangles whose length is twice the breadth

[C].smaller the dimensions of the field, smaller will be the hydraulic gradient andvelocity of flow through it

[D]. for homogeneous soil, the curves are smooth and circular.

Answer: OptionA

25. The ratio of the volume of water present in a given soil mass to the total volume of its voids,is known

[A]. porosity

[B]. void ratio

[C]. percentage voids

[D]. degree of saturation.

Answer: OptionD

26. Stoke's law does not hold good if the size of particle is smaller than

[A]. 0.0002 mm

[B]. 0.002 mm


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[C]. 0.02 mm

[D]. 0.2 mm

Answer: OptionA

27. In a purely cohesive soil, the critical centre lies at the intersection of

[A]. perpendicular bisector of slope and the locus of the centre

[B]. perpendicular drawn at l/3rd slope from toe and the locus of the centre

[C]. perpendicular drawn at 2/3rd slope from toe and the locus of the centre

[D]. directional angles

[E]. none of these.

Answer: OptionD

28. The angle of internal friction, is least for

[A]. angular-grained loose sand

[B]. angular -grained dense sand

[C]. round-grained loose sand

[D]. round-grained loose sand

[E]. clays.

Answer: OptionE

29. In non-cohesive soil in passive state of plastic equilibrium

[A]. major principal stress is horizontal

[B]. minor principal stress is vertical

[C]. major principal stress is vertical

[D]. minor and major principal stresses are equally inclined to the horizontal.

Answer: OptionB


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30. In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface

[A]. major principal stress is horizontal

[B]. minor principal stress is vertical

[C]. major principal stress is vertical

[D]. minor and major principal stresses are equally inclined to horizontal.

Answer: OptionC

31. The reduction in volume of soil due to squeezing out of water from the voids, is termed

[A]. primary consolidation

[B]. primary compression

[C]. primary time effect

[D]. all the above.

Answer: OptionD

32. 'Drift' is the material picked up, mixed, disintegrated, transported and redeposited by

[A]. wind

[B]. gravitational force

[C].glaciatedwater

[D]. all the above.

Answer: OptionC

33. The consistency index of a soil is defined as the ratio of

[A]. liquid limit plus the natural water content to the plasticity index of the soil

[B]. liquid limit minus the natural water content to the plasticity index of the soil

[C]. natural water content of a soil minus plastic limit to the plasticity index of the soil

[D]. natural water content of a soil plus its plastic limit to the plasticity index of the soil.


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Answer: OptionB

34. The weight of a container isW1 and that of container with soil simple, isW2. If the weight ofthe container and oven dried soil sample isW3, the moisture content of the soil, is

[A].

[B].

[C].

[D].

Answer: OptionA

35. The shear strength in plastic undrained clay, is due to

[A]. inter-granular friction

[B]. internal friction

[C]. cohesion

[D]. none of these.

Answer: OptionC

36. The Terzaghi's general bearing capacity equation for a continuous footing is given by (whereNc, 2V& and Ny are bearing capacity factors.)

[A]. qf=cNc + DNq +0.5BN

[B]. qf=cNc - DNq +0.5BN

[C]. qf=cNc - DNq +0.5BN

[D]. qf=cNc + DNq +0.5BN

Answer: OptionA


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37. A clay subjected to pressure in excess to its present over-burden, is said to be

[A]. pre-compressed

[B]. pre-consolidated

[C]. over-consolidated

[D]. all the above.

Answer: OptionD

38.

The expression is used for

[A]. dry density

[B]. bulk density

[C]. degree of saturation

[D]. optimum water content.

Answer: OptionA

39. IfCv is the coefficient of consolidation,tis the time anddis drainage path of onedimensional consolidation of soil, the time factorTv, is given by

[A].

[B].

[C].

[D].

Answer: OptionD

40. The total active earth pressure due to dry back fill with no surcharge, acts atH/3 above thebase of the wall and is directly proportional to


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[A]. H

[B].

[C]. H

[D]. H3.

Answer: OptionC

41. Ife0,e, , 0' have their usual meanings, the coefficient of compressibility (ac), is given by

[A].

[B].

[C].

[D].

Answer: OptionB

42. A saturated soil sample has water content of 40% and specific gravity of soil particles 2.7.The void ratio of the soil, is

[A]. 0.4

[B]. 0.52

[C]. 1.08

[D]. none of these.

Answer: OptionB

Explanation:S*e = G*w.

Where,S = saturation (which is equal to 1 due to saturated state).e = void ratio.


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G = specific gravity.w = water content.

e = 2.7 * 0.40 = 1.08.

The answer is 1.08.43. For testing a saturated clay for shear strength, the test recommended, is

[A]. direct shear test

[B]. triaxial compression test

[C]. unconfined compression test

[D]. all the above.

Answer: OptionC

44. The critical exist gradient of seepage water in soils, increases with

[A]. an increase in specific gravity

[B]. a decrease in specific gravity

[C]. a decrease in void ratio

[D]. both (a) and (c)

[E]. none of these.

Answer: OptionD

45. The coefficient ka of the active earth pressure, is given by

[A].

[B].

[C].


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[D].

Answer: OptionD


[A].The void ratio in soils is defined as the ratio of the volume of voids to the volumeof solids

[B].The porosity of a soil is defined as the ratio of the volume of voids to the grossvolume of the soil

[C]. The bulk density of a soil is defined as the unit weight of the soil

[D].The dry density of a soil is defined as weight of solids to the total volume of the

soil

[E]. All the above.

Answer: OptionE

47. The shear strength of a soil

[A]. increases with an increase in the normal stress

[B]. is proportional to the cohesion of the soil

[C]. is generally known as the strength of the soil

[D]. is proportional to the tangent of the angle of internal friction

[E]. all the above.

Answer: OptionE

48. The property of a soil which permits water to percolate through it, is called

[A]. moisture content

[B]. permeability

[C]. capillarity

[D]. none of these.


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Answer: OptionB

49. The triaxial apparatus is usually used for

[A]. unconsolidated-undrained test

[B]. consolidated-undrained test

[C]. drained test

[D].all the abovetests.

Answer: OptionD

50. A pycnometer is used to determine

[A]. voids ratio

[B]. dry density

[C].watercontent

[D]. density index.

Answer: OptionC

Section 5

1. Soils containing organic matters

[A].are of spongynature

[B]. swell with decrease of moisture

[C]. shrink with increase of moisture content

[D]. none of these.

Answer: OptionA

2. A soil not fully consolidated under the existing over-burden pressure, is called

[A]. pre-consolidated


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[B]. normally consolidated

[C].over-consolidated

[D]. none of these.

Answer: OptionC

3. The angle of internal friction is maximum for

[A]. angular-grained loose sand

[B].angular-grained densesand

[C]. round-grained dense sand

[D]. round-grained loose sand

[E]. clays.

Answer: OptionB

4. If G is specific gravity of sand particles,e is porosity, the critically hydraulic gradient

[A].

ic =

[B].ic =

[C].ic =

[D].ic =

Answer: OptionC

5. A grillage foundation

[A]. is provided for heavily loaded isolated columns


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[B]. is treated as spread foundation

[C]. consists of two sets of perpendicularly placed steel beams

[D]. all the above.

Answer: OptionD

6. The plasticity of fine soils may be assessed by means of

[A]. dry strength test

[B]. toughness test

[C]. dilatancy test

[D]. all of these.

Answer: OptionD

7. The density of soil can be increased

[A]. by reducing the space occupied by air

[B]. by elastic compression of soil grains

[C]. by expelling water from pores

[D]. All the above.

Answer: OptionD

8. The degree of saturation of the soil sample stated in Question No. 11.243, is

[A]. 54% [B]. 64%

[C]. 74% [D]. 84%

Answer: OptionD

9. The length/diameter ratio of cylindrical specimens used in triaxial test, is generally

[A]. 1 [B]. 1.5

[C]. 2 [D]. 2.5


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[E]. 3

Answer: OptionC

10. Pick up the correct statement from the following:[A].

The object of classifying soils is to arrange them into groups according to theirproperties and behaviour

[B].A soil classification system is meant to provide an accepted and systematic methodof describing the various types of soils eliminating personal factors

[C]. The first category of soil classification is based on grain size of the soil

[D]. The second category of soil classification is based on fine as well as coarse grains

[E]. All the above.

Answer: OptionE

11. The porosity of the soil sample stated in Q. No. 213, is

[A]. 44.3% [B]. 45.3%

[C]. 46.3% [D]. 47.3%

Answer: OptionC

12. A suspended particle falls through a heightHcm in water intminutes. If the viscosity ofwater is and specific gravity of the particle isG, the diameter of the particle is (whereMisa constant factor)

[A].103M

[B].104M

[C].105M

[D].102M


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Answer: OptionC

13. Laplacian fundamental equation for a non-compressible flow in three dimensions, is

[A].

[B].

[C].

[D]. none of these.

Answer: OptionC

14. The bearing capacity of a soil depends upon

[A]. size of the particles

[B]. shape of the particles

[C]. cohesive properties of particles

[D]. internal frictional resistance of particles

[E]. all the above.

Answer: OptionE

15. A direct shear test possesses the following disadvantage:

[A]. A relatively thin thickness of sample permits quick drainage

[B].A relatively thin thickness of sample permits quick dissipation of pore pressuredeveloped during the test

[C]. As the test progresses the area under shear, gradually changes

[D]. none of these.

Answer: OptionC

16. Through a point in a loaded soil mass, there existsn typical planes mutually orthogonal on


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which the stress is wholly normal and no shear stress acts, ifn is

[A]. 1 [B]. 2

[C]. 3 [D]. 4

Answer: OptionC

17. The pressure that builds up in pore water due to load increment on the soil, is termed

[A]. excess pore pressure

[B]. excess hydrostatic pressure

[C]. hydrodynamic pressure

[D]. all the above.

Answer: OptionD

18. The ratio ofemax andemin of silty sand, is

[A]. 2.0 [B]. 5

[C]. 3.0 [D]. 3.5

[E]. 4.0

Answer: OptionC

19. A flow net may be utilised for the determination of

[A]. exit gradient

[B]. seepage

[C]. hydrostatic pressure

[D]. seepage pressure

[E]. all the above.

Answer: OptionE

20. The neutral stress in a soil mass is

[A]. force per neutral area


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[B]. force per effective area

[C]. stess taken up by the pore water

[D]. stress taken up by solid particles.

Answer: OptionC

21. If voids ratio is 0.67, water content is 0.188 and specific gravity is 2.68, the degree ofsaturation of the soil, is

[A]. 25% [B]. 40%

[C]. 60% [D]. 75%

Answer: OptionD

22. If water content of a soil is 40%,G is 2.270 and void ratio is 1.35, the degree of saturation is

[A]. 70% [B]. 75%

[C]. 80% [D]. 85%

[E]. 90%

Answer: OptionC

23. If is the surcharge angle of a backfill with an angle of internal friction , the coefficient ofactive earth pressure given by Rankine's theory, is :

[A].

[B].

[C].

[D]. none of these.

Answer: OptionB


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24. A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possibleboth at upper and lower surfa

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