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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 13
Q1 | Grading of sand causes great variation in
- workability of concrete
- strength of concrete
- durability of concrete
- all the above
Q2 | The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 forobtaining the aggregates of F.M. 5.4, is
- 30 %
- 40 %
- 50 %
- 60 %
Q3 | The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is
- 1 : 2 : 4
- 1 : 3 : 6
- 1 : 1½ : 3
- 1 : 1 : 2
Q4 | Joints in concrete structures, are provided
- to reduce the tensile stresses likely to be developed due to evaporation of water
- to minimise the change in the dimensions of the slab
- to minimise the necessary cracking
- all the above
Q5 | For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
- 1 : 3 : 6
- 1 : 1½ : 3
- 1 : 2 : 4
- 1 : 1 : 2
Q6 | Pick up the correct statement from the following:
- water enables chemical reaction to take place with cement
- water lubricates the mixture of gravel, sand and cement
- strength of concrete structure largely depends upon its workability
- all the above
Q7 | The final operation of finishing floors, is known as
- screeding
- floating
- trowelling
- finishing
Q8 | Transport of concrete by pumps, is done for a distance of
- 100 m
- 200 m
- 300 m
- 400 m
Q9 | Curing
- reduces the shrinkage of concrete
- preserves the properties of concrete
- prevents the loss of water by evaporation
- all of the above
Q10 | The datum temperature for maturity by Plowman, is
- 23°c
- 0°
- - 5.6°c
- - 11.7°c
Q11 | The bulk density of aggregates, is generally expressed as
- tonnes/cubic metre
- kg/cubic metre
- kg/litre
- g/cm3
Q12 | For concreting tunnel linings, transportation of concrete is done by
- pans
- wheel borrows
- containers
- pumps
Q13 | The factor which affects workability, is
- water content and its temperature
- shape and size of the aggregates
- air entraining agents
- all the above
Q14 | Proper batching ensures
- economy
- durability
- workability
- all the above
Q15 | The ratio of the length to breadth of a wooden float, is
- 4.5
- 5.5
- 6.5
- 7.5
Q16 | Vicat's apparatus is used for
- fineness test
- consistency test
- setting time test
- soundness test
Q17 | Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolanacement, is
- 30 %
- 40 %
- 50 %
- 60 %
Q18 | The grade of concrete not recommended by I.S. : 456, is
- m 100
- m 200
- m 300
- m 500
Q19 | The compaction of concrete, improves
- density
- strength
- durability
- all the above
Q20 | Segregation is responsible for
- honey-combed concrete
- porous layers in concrete
- surface scaling in concrete
- all the above
Q21 | Slump test of concrete is a measure of its
- consistency
- compressive strength
- tensile strength
- impact value
Q22 | If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of aconcrete mixer of 150 litre capacity, is
- 15,900 litres
- 16,900 litres
- 17,900 litres
- 18,900 litres
Q23 | An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S.sieve No. 9, more than
- 5 %
- 10 %
- 15 %
- 20 %
Q24 | The top diameter, bottom diameter and the height of a slump mould are:
- 10 cm, 20 cm, 30 cm
- 10 cm, 30 cm, 20 cm
- 20 cm, 10 cm, 30 cm
- 20 cm, 30 cm, 10 cm