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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 1
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