Concrete Technology And Design Set 1 MCQs

Q1 | The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

not needed

provided equally on inner and front faces

provided more on inner face than on front face

provided more on front face than on inner face

Q2 | Bulking of sand is maximum if moisture content is about

2 %

4 %

6 %

10 %

Q3 | Diagonal tension in a beam

is maximum at neutral axis

decreases below the neutral axis and increases above the neutral axis

increases below the neutral axis and decreases above the neutral axis

remains same

Q4 | According to IS: 4561978, the column or the strut is the member whose effective length is greaterthan

the least lateral dimension

2 times the least lateral dimension

3 times the least lateral dimension

4 times the least lateral dimension

Q5 | When shear stress exceeds the permissible limit in a slab, then it is reduced by

increasing the depth

providing shear reinforcement

using high strength steel

using thinner bars but more in number

Q6 | The diameter of ties in a column should be

more than or equal to one fourth of diameter of main bar

more than or equal to 5 mm

more than 5 mm but less than one-fourth of diameter of main bar

more than 5 mm and also more than one-fourth of diameter of main bar

Q7 | In counterfort retaining walls, the main reinforcement in the stem at support is

not provided

provided only on inner face

provided only on front face

provided both on inner and front faces

Q8 | Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

deflect downward

deflect upward

deflect downward or upward

none of the above

Q9 | The purpose of reinforcement in pre-stressed concrete is

to provide adequate bond stress

to resist tensile stresses

to impart initial compressive stress in concrete

all of the above

Q10 | Select the correct statement

elastic modulus of high tensile steel is nearly the same as that of mild steel

elastic modulus of high tensile steel is more than that of mild steel

carbon percentage in high carbon steel is less than that in mild steel

high tensile steel is cheaper than mild steel

Q11 | Due to circumferential action of the spiral in a spirally reinforced column

capacity of column is decreased

ductility of column reduces

capacity of column is decreased but ductility of column increases

both the capacity of column and ductility of column increase

Q12 | For concreting of heavily reinforced sections without vibration, the workability of concreteexpressed as compacting factor should be

0.75 - 0.80

0.80 - 0.85

0.85 - 0.92

above 0.92

Q13 | Workability of concrete is directly proportional to

aggregate cement ratio

time of transit

grading of the aggregate

all of above

Q14 | Critical section for shear in case of flat slabs is at a distance of

effective depth of slab from periphery of column/drop panel

d/2 from periphery of column/capital/ drop panel

at the drop panel of slab

at the periphery of column

Q15 | For road pavements, the cement generally used, is

ordinary portland cement

rapid hardening cement

low heat cement

blast furnace slag cement

Q16 | Pick up the incorrect statement from the following:

space between the exterior walls of a warehouse and bag piles should be 30 cm

cement bags should preferably be piled on wooden planks

width and height of the pile should not exceed 3 m and 2.70 m respectively

none of these

Q17 | For a slab supported on its four edges with corners held down and loaded uniformly, the Marcuscorrection factor to the moments obtained by Grashoff Rankine's theory

is always less than 1

is always greater than 1

can be more than 1

can be less than 1

Q18 | Addition of pozzolana to ordinary port land cement, causes

decrease in early strength

reduction in chemical action with sulphates

increase in shrinkage

all the above

Q19 | Pick up the correct statement from the following:

the maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm

the maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm

the material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt

all the above

Q20 | For construction of structures in sea water, the cement generally preferred to, is

portland-pozzolana cement

quick setting cement

low heat portland cement

rapid hardening cement

Q21 | Curing of pavements, floors, roofs and slabs, is done by

membrane method

ponding method

covering surface with bags

sprinkling water method

Q22 | Pick up the correct statement from the following:

construction joints are necessarily planned for their locations

expansion joints are provided to accommodate thermal expansion

construction joints are provided to control shrinkage cracks

all the above

Q23 | The bulk density of aggregates, depends upon

shape

grading

compaction

all the above

Q24 | In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

compressive and tensile

tensile and compressive

both compressive

both tensile

Q25 | The main object of compaction of concrete, is:

to eliminate air holes

to achieve maximum density

to provide intimate contact between the concrete and embedded materials

all the above