CT-mcq.pdf - PCCOER

((MARKS)) QUESTION IS OF HOW MANY MARKS? (1 OR 2 OR 3 UPTO 10)

1

((QUESTION))

ENTER CONTENT. QTN CAN HAVE IMAGES ALSO

Pick up the correct proportion of chemical ingredients of cement

((OPTION_A))

THIS IS MANDATORY OPTION

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

((OPTION_B))

THIS IS ALSO MANDATORY OPTION

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

((OPTION_C))

This is optional

Alumina:Silica:Lime:Iron oxide:63:22:63:3

((OPTION_D))

This is optional

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

((OPTION_E)) This is optional. If optional keep empty so that system will skip this option

((CORRECT_CHOICE)) Either A or B or C or D or E

A

((EXPLANATION)) This is also optional


1

((QUESTION))


The diameter of the vicat plunger is 10 mm and its length varies from

((OPTION_A))


20 mm to 30 mm

((OPTION_B))


30 mm to 40 mm

((OPTION_C))

This is optional

40 mm to 50 mm

((OPTION_D))

This is optional

50 mm to 60 mm



D



1

((QUESTION))


Gypsum is added for

((OPTION_A))


color

((OPTION_B))


Strength

((OPTION_C))

This is optional

controlling setting time

((OPTION_D))

This is optional

none of these



C



1

((QUESTION))


Vicat apparatus used for

((OPTION_A))


consistency test

((OPTION_B))


test for setting time

((OPTION_C))

This is optional

test for tensile strength

((OPTION_D))

This is optional

fineness test



A



1

((QUESTION))


Le-chatelier’s apparatus is used for testing

((OPTION_A))


Unsoundness of cement

((OPTION_B))


soundness of cement

((OPTION_C))

This is optional

Strength of cement

((OPTION_D))

This is optional

Durability of cement



B



1

((QUESTION))


Finer the cement

((OPTION_A))


) Higher is the rate of hydration

((OPTION_B))


more is the surface area

((OPTION_C))

This is optional

lesser the amount of water required for slump

((OPTION_D))

This is optional

all of above



D



1

((QUESTION))


Insoluble residue in cement should be

((OPTION_A))


less than 0.85%

((OPTION_B))


less than 10%

((OPTION_C))

This is optional

between 5 and 10%

((OPTION_D))

This is optional

) between 1.5 and 5%



A



1

((QUESTION))


Coefficient of thermal expansion of cement concrete is

((OPTION_A))


3𝑋10−4 per ⁰c

((OPTION_B))


3𝑋10−5 𝑝𝑒𝑟0 c

((OPTION_C))

This is optional

3𝑋10−6per ⁰c

((OPTION_D))

This is optional

3𝑋10−8per ⁰c



B



1

((QUESTION))


The average specific surface of cement is closer

((OPTION_A))


)100000𝑚𝑚2 /g

((OPTION_B))


) 200000𝑚𝑚2 /g

((OPTION_C))

This is optional

300000𝑚𝑚2 /g

((OPTION_D))

This is optional

) 400000𝑚𝑚2 /g



C



1

((QUESTION))


for ordinary Portland cement the maximum expansion by Le chateliaer method should not exceed

((OPTION_A))


2mm

((OPTION_B))


5mm

((OPTION_C))

This is optional

7.5 mm

((OPTION_D))

This is optional

10mm



D



1

((QUESTION))


Autoclave method is used to determine

((OPTION_A))


residue

((OPTION_B))


expansion

((OPTION_C))

This is optional

heat of hyadration

((OPTION_D))

This is optional

sulphur content



B



1

((QUESTION))


The minimum percentage of chemical ingredient of cement is that of

((OPTION_A))


magnesium oxide

((OPTION_B))


iron oxide

((OPTION_C))

This is optional

alumina

((OPTION_D))

This is optional

lime



B



1

((QUESTION))


Tri calcium aluminate (C3A

((OPTION_A))


Hydrates rapidly

((OPTION_B))


generates less heat of hydration

((OPTION_C))

This is optional

causes initial setting and early strength of cement

((OPTION_D))

This is optional

does not contribute develop ultimate strength



C



1

((QUESTION))


In the air permeability method for testing of Portland cement for fineness the apparatus essentially consists of

((OPTION_A))


permeability cell,sieve and rotameter

((OPTION_B))


permeability cell,manometer and flow meter

((OPTION_C))

This is optional

sieve,barometer and rotameter

((OPTION_D))

This is optional

manometer,sieve and rotameter



B



1

((QUESTION))


sieve analysis of Portland cement is performed on IS sieve

((OPTION_A))


No.1

((OPTION_B))


) No.3

((OPTION_C))

This is optional

No.5

((OPTION_D))

This is optional

) No.9



D



1

((QUESTION))


17 Air permeability test of cement is conducted to find

((OPTION_A))


unsoundness

((OPTION_B))


Specific gravity

((OPTION_C))

This is optional

Ignition loss

((OPTION_D))

This is optional

Fineness



D



1

((QUESTION))


percentage of gypsum added the clinker during manufacturing process is

((OPTION_A))


0.2

((OPTION_B))


0.25 to 0.35

((OPTION_C))

This is optional

2.5 to 3.5

((OPTION_D))

This is optional



C



1

((QUESTION))


The cement used in construction of docks and harbour

((OPTION_A))


Blast furnace slag cement

((OPTION_B))


waterproof cement

((OPTION_C))

This is optional

sulphate resisting Portland cement

((OPTION_D))

This is optional

high strength Portland cement



C



1

((QUESTION))


The constituent compounds of cement in decreasing order of rate of hydration are

((OPTION_A))


)C2S,C3S and C3A

((OPTION_B))


C3S,C3A and C2S

((OPTION_C))

This is optional

C3A, C3S and C2S

((OPTION_D))

This is optional

C3A, C2S and C3S



A



1

((QUESTION))


The contribution of constituents of cement to strength of cement is in the decreasing order

((OPTION_A))


C3S, C2S, ,C3A and C4AF

((OPTION_B))


C2S, C3S, C3A and C4AF

((OPTION_C))

This is optional

C2S,C4AF,C3A and C3S

((OPTION_D))

This is optional

C3S,C3A,C2S and C4AF



D



1

((QUESTION))


The aggregate is called cyclopean aggregate if its size is more than

((OPTION_A))


) 4.75 mm

((OPTION_B))


30 mm

((OPTION_C))

This is optional

60 mm

((OPTION_D))

This is optional

75 mm



B



1

((QUESTION))


An aggregate has unit weight ranging from 28 to 30 KN/𝑚3 is defined as

((OPTION_A))


rounded aggregate

((OPTION_B))


light weight aggregate

((OPTION_C))

This is optional

heavy weight aggregate

((OPTION_D))

This is optional

normal weight aggregate





1

((QUESTION))


An aggregate has unit weight ranging from 23 to 26 KN/𝑚3 is defined as

((OPTION_A))


rounded aggregate

((OPTION_B))


rounded aggregate

((OPTION_C))

This is optional

heavy weight aggregate

((OPTION_D))

This is optional

normal weight aggregate





1

((QUESTION))


An aggregate is called elongated , if its greatest dimension is greater than

((OPTION_A))


2/3 mean dimension

((OPTION_B))


9/2 mean dimension

((OPTION_C))

This is optional

9/5 mean dimension

((OPTION_D))

This is optional

5/8 mean dimension



C



1

((QUESTION))


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

((OPTION_A))


) equal to the mean size

((OPTION_B))


twice to the mean size

((OPTION_C))

This is optional

) thrice to the mean size

((OPTION_D))

This is optional

four times to the mean size



C



1

((QUESTION))


For determining crushing strength of aggregate, number of tamping for each layer are

((OPTION_A))


20 times

((OPTION_B))


25 times

((OPTION_C))

This is optional

25 times

((OPTION_D))

This is optional

40 times



B



1

((QUESTION))


If the fineness modulus of sand is 2.5 ,it is graded as

((OPTION_A))


ver coarse sand

((OPTION_B))


Coarse sand

((OPTION_C))

This is optional

medium sand

((OPTION_D))

This is optional

fine sand



D



1

((QUESTION))


Ordinate of grading curve of an aggregate represnts

((OPTION_A))


cumulative % passing through each sieve plotted on normal scale

((OPTION_B))


cumulative % passing each sieve plotted on logarithmic scale

((OPTION_C))

This is optional

sieve size plotted on normal scale

((OPTION_D))

This is optional

sieve size plotted on logarithmic scale





1

((QUESTION))


Abscissa of grading curve of an aggregate represents

((OPTION_A))


cumulative % passing through each sieve plotted on normal scale

((OPTION_B))


cumulative % passing each sieve plotted on logarithmic scale

((OPTION_C))

This is optional

) sieve size plotted on normal scale

((OPTION_D))

This is optional

sieve size plotted on logarithmic scale





1

((QUESTION))


Fineness modulus of fine aggregate is varies between

((OPTION_A))


2-3.5

((OPTION_B))


3.5-5.0

((OPTION_C))

This is optional

5-6.0

((OPTION_D))

This is optional

6-7.5





1

((QUESTION))


Fineness modulus of Sand is 3.0, it is graded as

((OPTION_A))


fine sand

((OPTION_B))


medium sand

((OPTION_C))

This is optional

coarse sand

((OPTION_D))

This is optional

none of these



C



1

((QUESTION))


Los angles machine as used to test the aggregate for

((OPTION_A))


crushing strength

((OPTION_B))


impact value

((OPTION_C))

This is optional

abrasion resistance

((OPTION_D))

This is optional

water absorption



C



1

((QUESTION))


The standard sand now a days used in india ,is obtained from

((OPTION_A))


Jaipur (Rajasthan)

((OPTION_B))


Jullundur (Punjab

((OPTION_C))

This is optional Hyderabad ( Andhra Pradesh)

((OPTION_D))

This is optional

Ennre ( Madras)



D



1

((QUESTION))


Workability of concrete is directly proportional to

((OPTION_A))


grading of the aggregate

((OPTION_B))


time of transit

((OPTION_C))

This is optional

time of transit

((OPTION_D))

This is optional

none of these





1

((QUESTION))


The factor which affects workability ,is

((OPTION_A))


water content and its temperture

((OPTION_B))


shape and size of the aggragate

((OPTION_C))

This is optional

grading and surface textures of the aggregate

((OPTION_D))

This is optional

all of above





1

((QUESTION))


The formation of cement paste at the concrete surface is called as

((OPTION_A))


bleeding

((OPTION_B))


bleeding

((OPTION_C))

This is optional

segregation

((OPTION_D))

This is optional

segregation





1

((QUESTION))


The factor which affects workability is

((OPTION_A))


)water content and its temperture

((OPTION_B))


)water content and its temperture

((OPTION_C))

This is optional

grading and surface texture of the aggraagtes

((OPTION_D))

This is optional

grading and surface texture of the aggraagtes





1

((QUESTION))


If air entrained in cement concrete

((OPTION_A))


workability is decreased

((OPTION_B))



((OPTION_C))

This is optional


((OPTION_D))

This is optional

) permeability of concrete is increased





1

((QUESTION))


For a thick and lightly reinforced structure, workability of concrete should be

((OPTION_A))


high

((OPTION_B))


)low

((OPTION_C))

This is optional

medium

((OPTION_D))

This is optional

zero





1

((QUESTION))


Slump test of concrete is a measure of its

((OPTION_A))


consistency

((OPTION_B))


compressive strength

((OPTION_C))

This is optional

tensile strength

((OPTION_D))

This is optional

impact value





1

((QUESTION))


the workability of concrete by slump test is expressed as

((OPTION_A))


𝑚𝑚3 /h

((OPTION_B))


𝑚𝑚3 /h

((OPTION_C))

This is optional

mmn/h

((OPTION_D))

This is optional

mm



D



1

((QUESTION))


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

((OPTION_A))


10 mm,20 mm,30mm

((OPTION_B))


10 cm,30 cm,20 cm

((OPTION_C))

This is optional

20 cm,10 cm,30 cm

((OPTION_D))

This is optional

20 cm,30 cm,10 cm



A



1

((QUESTION))


Tamping rod used in slump cone test has standard length is

((OPTION_A))


1m

((OPTION_B))


0.6 m

((OPTION_C))

This is optional

2.5 m

((OPTION_D))

This is optional

1.6 m





1

((QUESTION))


Test most suitable for concrete of very low workability is

((OPTION_A))


slump cone

((OPTION_B))


Compaction factor test

((OPTION_C))

This is optional

Vee bee test

((OPTION_D))

This is optional

all of these





1

((QUESTION))


for RCC slab the slump of concrete to be canal lining should be

((OPTION_A))


) 0-25 mm

((OPTION_B))


25-50 mm

((OPTION_C))

This is optional

25-75 mm

((OPTION_D))

This is optional

50-100mm





1

((QUESTION))


compacting factor test of cement concrete determines its

((OPTION_A))


strength

((OPTION_B))


porosity

((OPTION_C))

This is optional

porosity

((OPTION_D))

This is optional

porosity





1

((QUESTION))


A compaction factor of a concrete is 0.90 ,then workability

((OPTION_A))


very low

((OPTION_B))


Low

((OPTION_C))

This is optional

medium

((OPTION_D))

This is optional

high





1

((QUESTION))


the test useful for determining workability of very dry concrete is

((OPTION_A))


Slump cone

((OPTION_B))


Vee bee test

((OPTION_C))

This is optional

compaction factor test

((OPTION_D))

This is optional

none of these



C



1

((QUESTION))


The process of mixing ,transporting, placing and compacting concrete using ordinary port and cement should not take more than

((OPTION_A))


30 min

((OPTION_B))


) 40 min

((OPTION_C))

This is optional

60 min

((OPTION_D))

This is optional

75 min



A



1

((QUESTION))


The formation of cement paste at the concrete is called as

((OPTION_A))


Bleeding

((OPTION_B))


creep

((OPTION_C))

This is optional

Segregation

((OPTION_D))

This is optional

Laitance





1

((QUESTION))


The compaction concrete , improves

((OPTION_A))


density

((OPTION_B))


strength

((OPTION_C))

This is optional

) durability

((OPTION_D))

This is optional

) durability





1

((QUESTION))


The process of hardening the concrete by keeping its surface moist is known

((OPTION_A))


) placing

((OPTION_B))


wetting

((OPTION_C))

This is optional

curing

((OPTION_D))

This is optional

compacting





1

((QUESTION))


the strength of concrete mainly depends upon

((OPTION_A))


quality of the aggregate

((OPTION_B))


quality of coarse aggregate

((OPTION_C))

This is optional

fineness of cement

((OPTION_D))

This is optional

fineness of cement





1

((QUESTION))


the strength of concrete increase with

((OPTION_A))


increase in water cement ratio

((OPTION_B))


decrease in water cement ratio

((OPTION_C))

This is optional

decrease in size of aggregate

((OPTION_D))

This is optional

decrease in curing time





1

((QUESTION))


minimum water-cement ratio required for full hydration of cement is

((OPTION_A))


0.18

((OPTION_B))


0.36

((OPTION_C))

This is optional

0.54

((OPTION_D))

This is optional

0.60





1

((QUESTION))


if water/ cement ratio is reduced from 0.45 to 0.38,then

((OPTION_A))


strength of concrete will decrease

((OPTION_B))


strength of concrete will increase

((OPTION_C))

This is optional

no change on strength

((OPTION_D))

This is optional

strength of concrete will increase





1

((QUESTION))


water/cement ratio law was suggested by

((OPTION_A))


power

((OPTION_B))


Brownian

((OPTION_C))

This is optional

Duff Abram

((OPTION_D))

This is optional

Feret





1

((QUESTION))


maturity of concrete is expressed as

((OPTION_A))


maturity = Ʃ (time x temperature)

((OPTION_B))


maturity = Ʃ (time / temperature

((OPTION_C))

This is optional

maturity = ( 𝑡𝑖𝑚𝑒2 x temperature

((OPTION_D))

This is optional

none of these





1

((QUESTION))


((OPTION_A))


((OPTION_B))


((OPTION_C))

This is optional

((OPTION_D))

This is optional



A


CT-mcq.pdf - PCCOER

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