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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 5
Q1 | The maximum amount of dust which may be permitted in aggregates is
- 5% of the total aggregates for low workability with a coarse grading
- 10% of the total aggregates for low workability with a fine grading
- 20% of the total aggregates for a mix having high workability with fine grading
- all the above
Q2 | Bulking of sand is
- mixing of different sizes of sand particles
- mixing of lime with sand
- maximum water with sand
- swelling of sand when wetted
Q3 | For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than thediameter of bar nor less than
- 15 mm
- 25 mm
- 30 mm
- 40 mm
Q4 | Workability of concrete is measured by
- vicat apparatus test
- slump test
- minimum void method
- talbot richard test
Q5 | The size of fine aggregates does not exceed
- 2.75 mm
- 3.00 mm
- 3.75 mm
- 4.75 mm
Q6 | The main reason for providing number of reinforcing bars at a support in a simply supported beamis to resist in that zone
- compressive stress
- shear stress
- bond stress
- tensile stress
Q7 | The entrained air in concrete
- increases workability
- decreases workability
- decreases resistance to weathering
- increases strength
Q8 | According to IS: 4561978, the flexural strength of concrete is
- directly proportional to compressive strength
- inversely proportional to compressive strength
- directly proportional to square root of compressive strength
- inversely proportional to square root of compressive strength
Q9 | Slump test is done for
- clay
- sand
- lime
- concrete
Q10 | Di-calcium silicate (C2S)
- hydrates rapidly
- generates less heat of hydration
- hardens rapidly
- provides less ultimate strength to cement
Q11 | The limits of percentage p of the longitudinal reinforcement in a column is given by
- 0.15% to 2%
- 0.8% to 4%
- 0.8% to 6%
- 0.8% to 8%
Q12 | The risk of segregation is more for
- wetter mix
- larger proportion of maximum size aggregate
- coarser grading
- all the above
Q13 | Le-Chatelier's apparatus is used for testing
- soundness of cement
- hardness of cement
- strength of cement
- durability of cement
Q14 | Construction joints are generally provided in concrete
- roads
- retaining walls
- lining of canals
- all the above
Q15 | If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve,the graded aggregates do not contain
- 20 mm particles
- 10 mm particles
- 4.75 mm particles
- all the above
Q16 | Most common method of pre-stressing used for factory production is
- long line method
- freyssinet system
- magnel-blaton system
- lee-macall system
Q17 | C.R.R.I. charts are used to obtain a relationship between strength of concrete and
- water cement ratio
- workability
- grading of aggregate
- fineness modulus
Q18 | For the design of retaining walls, the minimum factor of safety against overturning is taken as
- 1.5
- 2.0
- 2.5
- 3.0
Q19 | If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundatedwith water is 12 cm, the bulking of the moist sand, is
- 10 %
- 12 %
- 15 %
- 25 %
Q20 | If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60mm, the particular aggregate will be flaky if its minimum dimension is less than
- 20.5 mm
- 30.5 mm
- 40.5 mm
- 50.5 mm
Q21 | If the foundations of all the columns of a structure are designed on the total live and dead loadbasis, then
- there will be no settlement of columns
- there will be no differential settlement
- the settlement of exterior columns will be more than interior columns
- the settlement of interior columns will be more than exterior columns
Q22 | Saw dust can be rendered chemically inert by boiling it in water containing
- ferrous sulphate
- potassium chloride
- ammonia
- nitric acid
Q23 | A concrete having a slump of 6.5 cm, is said to be
- dry
- earth moist
- semi-plastic
- plastic
Q24 | To obtain a very high strength concrete, use very fine grained
- granite
- magnetite
- barite
- volcanic scoria
Q25 | Vicat apparatus is used for
- fineness test
- consistency test
- test for setting time
- test for tensile strength