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Concrete Technology MCQ Questions & Answers

Concrete Technology MCQs : This section focuses on the "Concrete Technology". These Multiple Choice Questions (MCQs) should be practiced to improve the Concrete Technology skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

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 weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

A. 7.3
B. 7.35
C. 7.4
D. 7.45

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Question 2

The commonly used material in the manufacture of cement is

A. sand stone
B. slate
C. lime stone
D. graphite.

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Question 3

Transport of concrete by pumps, is done for a distance of

A. 100 m
B. 200 m
C. 300 m
D. 400 m

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Question 4

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

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Question 5

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.

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Question 6

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

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Question 7

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

A. grading
B. curing
C. mixing
D. batching

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Question 8

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

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Question 9

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

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Question 10

The bulk density of aggregates does not depend upon :

A. size and shape of aggregates
B. specific gravity of aggregates
C. grading of aggregates
D. size and shape of the container

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Question 11

The mixture of different ingredients of cement, is burnt at

A. 1000°C
B. 1200°C
C. 1400°C
D. 1600°C

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Question 12

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

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Question 13

Slump test is done for

A. clay
B. sand
C. lime
D. concrete.

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Question 14

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)

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Question 15

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 1200°C
B. 1200° and 1300°C
C. 1300° and 1400°C
D. 1400° and 1500°C

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Question 16

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

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Question 17

The risk of segregation is more for

A. wetter mix
B. larger proportion of maximum size aggregate
C. coarser grading
D. all the above.

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Question 18

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
C. 3/5th of mean dimension
D. 4/5th of mean dimension

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Question 19

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.

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Question 20

The rock which is not calcareous, is :

A. lime stone
B. macl
C. chalk
D. laterite

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Question 21

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.

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Question 22

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

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Question 23

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%

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Question 24

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

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Question 25

Workability of concrete is measured by

A. Vicat apparatus test
B. Slump test
C. Minimum void method
D. Talbot Richard test.

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Question 26

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.

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Question 27

After casting, an ordinary cement concrete on drying

A. expands
B. mix
C. shrinks
D. none of these.

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Question 28

Vicat's apparatus is used for

A. fineness test
B. consistency test
C. setting time test
D. soundness test

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Question 29

For ensuring quality of concrete, use

A. single sized aggegates
B. two sized aggregate
C. graded aggregates
D. coarse aggregates.

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Question 30

The ratio of the length to breadth of a wooden float, is

A. 4.5
B. 5.5
C. 6.5
D. 7.5

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