Concrete Technology And Design Set 8 MCQs

Q1 | Permissible compressive strength of M 200 concrete grade is

100 kg/cm2

150 kg/cm2

200 kg/cm2

250 kg/cm2

Q2 | The minimum diameter of longitudinal bars in a column is

6 mm

8 mm

12 mm

16 mm

Q3 | The high strength of rapid hardening cement at early stage, is due to its

finer grinding

burning at high temperature

increased lime cement

higher content of tricalcium

Q4 | Sand requiring a high water cement ratio, belongs to

zone i

zone ii

zone iii

zone iv

Q5 | Minimum grade of concrete to be used in reinforced concrete as per IS: 4561978 is

m 15

m 20

m 10

m 25

Q6 | While compacting the concrete by a mechanical vibrator, the slump should not exceed

2.5 cm

5.0 cm

7.5 cm

10 cm

Q7 | Non-uniform compaction may cause the concrete

porous

non-homogeneous

reduced strength

all the above

Q8 | Modulus of rupture of concrete is a measure of

flexural tensile strength

direct tensile strength

compressive strength

split tensile strength

Q9 | M10 grade of concrete approximates

1 : 3 : 6 mix

1 : 1 : 2 mix

1 : 2 : 4 mix

1 : 1.5 : 3 mix

Q10 | Higher workability of concrete is required if the structure is

made with cement concrete

thick and reinforced

thin and heavily reinforced

thick and heavily reinforced

Q11 | For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is

3.5 m

4 m

4.5 m

5 m

Q12 | The bulk density of aggregates does not depend upon:

size and shape of aggregates

specific gravity of aggregates

grading of aggregates

size and shape of the container

Q13 | How long will it take for the concrete to achieve 100% of its strength?

7 days

14 days

21 days

28 days

Q14 | A higher modular ratio shows

higher compressive strength of concrete

lower compressive strength of concrete

higher tensile strength of steel

lower tensile strength of steel

Q15 | For the construction of cement concrete floor, the maximum permissible size of aggregate, is

4 mm

6 mm

8 mm

10 mm

Q16 | The specifications of a cement bag for storage, are

weight 50 kg

height 18 cm

plan area 3000 sq. cm

all the above

Q17 | The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

top face perpendicular to wall

bottom face perpendicular to wall

both top and bottom faces perpendicular to wall

none of the above

Q18 | Separation of coarse aggregates from mortar during transportation, is known

bleeding

creeping

segregation

shrinkage

Q19 | A flaky aggregate is said to be elongated if its length is

equal to the mean size

twice the mean size

thrice the mean size

four times the mean size

Q20 | You are asked to construct a massive dam, the type of cement you will use, is

ordinary portland cement

rapid hardening cement

low heat cement

blast furnace slag cement

Q21 | An ideal ware house, is provided

water proof masonry walls

water proof roof

few windows which remain generally closed

all the above

Q22 | Normally pre-stressing wires are arranged in the

upper part of the beam

lower part of the beam

center

anywhere

Q23 | Pick up the correct statement from the following:

bulking of sand is caused due to formation of a thin film of surface moisture

fine sand bulks more than coarse sand

the volume of fully saturated sand, is equal to the volume of dry and loose sand

all the above

Q24 | The minimum percentage of chemical ingredient of cement is that of

magnesium oxide

iron oxide

alumina

lime

Q25 | Poisson's ratio for concrete

remains constant

increases with richer mixes

decreases with richer mixes

none of the above