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
Question 2
The commonly used material in the manufacture of cement is
A. sand stone
B. slate
C. lime stone
D. graphite.
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
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
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.
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
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
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
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
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
Question 11
The mixture of different ingredients of cement, is burnt at
A. 1000°C
B. 1200°C
C. 1400°C
D. 1600°C
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
Question 13
Slump test is done for
A. clay
B. sand
C. lime
D. concrete.
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)
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
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
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.
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
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.
Question 20
The rock which is not calcareous, is :
A. lime stone
B. macl
C. chalk
D. laterite
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.
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
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%
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
Question 25
Workability of concrete is measured by
A. Vicat apparatus test
B. Slump test
C. Minimum void method
D. Talbot Richard test.
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.
Question 27
After casting, an ordinary cement concrete on drying
A. expands
B. mix
C. shrinks
D. none of these.
Question 28
Vicat's apparatus is used for
A. fineness test
B. consistency test
C. setting time test
D. soundness test
Question 29
For ensuring quality of concrete, use
A. single sized aggegates
B. two sized aggregate
C. graded aggregates
D. coarse aggregates.
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