Concrete Technology And Design Set 13 MCQs

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