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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 7
Q1 | The process of mixing, transporting, placing and compacting concrete using Ordinary Port landCement should not take more than
- 30 minutes
- 40 minutes
- 60 minutes
- 90 minutes
Q2 | The strength of concrete after one year as compared to 28 days strength is about
- 10 to 15% more
- 15 to 20% more
- 20 to 25% more
- 25 to 50% more
Q3 | Specified compressive strength of concrete is obtained from cube tests at the end of
- 3 days
- 7 days
- 21 days
- 28 days
Q4 | Pick up the incorrect statement from the following:
- tricalcium silicate (c3s) hydrates rapidly
- tricalcium silicate (c3s) generates more heat of hydration
- tricalcium silicate (c3s) develops early strength
- tricalcium silicate (c3s) has more resistance to sulphate attack
Q5 | If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singlyreinforced rectangular balanced section will be
- 0.35 d
- 0.40 d
- 0.45 d
- dependent on grade of concrete also
Q6 | A construction joint is provided where
- bending moment is small
- shear force is small
- the member is supported by other member
- all the above
Q7 | Sand generally contains salt if it is obtained from:
- nala beds
- river beds
- sea beds
- none of these
Q8 | According to IS: 4561978, minimum slenderness ratio for a short column is
- less than 12
- less than 18
- between 18 and 24
- more than 24
Q9 | Water cement ratio is
- volume of water to that of cement
- weight of water to that of cement
- weight of concrete to that of water
- both (a) and (b) of the above
Q10 | For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of waterrequired per bag, is
- 10 kg
- 12 kg
- 14 kg
- 16 kg
Q11 | is the span)
- l/3
- l/5
- l/7
- l/10
Q12 | Pick up the incorrect statement from the following:
- in properly graded aggregates, bulk density is more
- in single size aggregates, bulk density is least
- in single size aggregates, bulk density is maximum
- none of these
Q13 | To prevent segregation, the maximum height for placing concrete, is
- 100 cm
- 125 cm
- 150 cm
- 200 cm
Q14 | For a simply supported beam of span 15 m, the minimum effective depth to satisfy the verticaldeflection limits should be
- 600 mm
- 750 mm
- 900 mm
- more than 1 m
Q15 | For compacting plain concrete road surface of thickness less than 20 cm, we use
- internal vibrator
- screed vibrator
- form vibrator
- none of these
Q16 | Expansion joints are provided if the length of concrete structures exceeds
- 10 m
- 15 m
- 15 m
- 45 m
Q17 | The permissible diagonal tensile stress in reinforced brick work is
- about 0.1 n/mm²
- zero
- 0.3 n/mm² to 0.7 n/mm²
- about 1.0 n/mm²
Q18 | Pick up the correct statement from the following:
- the concrete gains strength due to hydration of cement
- the concrete does not set at freezing point
- the strength of concrete increases with its age
- all the above
Q19 | Separation of water or water sand cement from a freshly concrete, is known
- bleeding
- creeping
- segregation
- flooding
Q20 | The critical section for finding maximum bending moment for footing under masonry wall islocated
- at the middle of the wall
- at the edge of the wall
- halfway between the middle and edge of the wall
- at a distance equal to effective depth of footing from the edge of the wall
Q21 | On a grading curve, the gap grading is represented by
- a horizontal line
- a vertical line
- n.w. inclined line
- n.e. inclined line
Q22 | High temperature
- increases the strength of concrete
- decreases the strength of concrete
- has no effect on the strength of concrete
- none of these
Q23 | Horizontal construction joints in concrete walls are generally provided at
- soffit level
- window sill level
- floor level
- all the above
Q24 | Stress strain curve of high tensile steel
- has a definite yield point
- does not show definite yield point but yield point is defined by 0.1% proof stress
- does not show definite yield point but yield point is defined by 0.2% proof stress
- does not show definite yield point but yield point is defined by 2% proof stress,
Q25 | Addition of pozzolana to cement causes
- reduction in permeability
- loss of heat of hydration
- reduction in bleeding
- all the above