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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 3
Q1 | For the construction of thin R.C.C. structures, the type of cement to be avoided, is
- ordinary portland cement
- rapid hardening cement
- low heat cement
- blast furnace slag cement
Q2 | Which of the following R.C. retaining walls is suitable for heights beyond 6 m?
- l-shaped wall
- t-shaped wall
- counterfort type
- all of the above
Q3 | For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:
- 70 litres of sand and 120 litres of aggregates
- 70 kg of sand and 140 litres of aggregates
- 105 litres of sand and 140 litres of aggregates
- 105 litres of sand and 210 litres of aggregates
Q4 | A concrete using an air entrained cement
- has strength less than 10% to 15%
- has more resistance to weathering
- is more plastic and workable
- is free from segregation and bleeding
Q5 | Pick up the correct statement from the following:
- segregation is necessary for a workable concrete
- consistency does not affect the workability of concrete
- if the concrete mix is dry, the slump is maximum
- none of these
Q6 | The surface where two successive placements of concrete meet, is known as
- contraction joint
- expansion joint
- construction joint
- both (a) and (b)
Q7 | A beam curved in plan is designed for
- bending moment and shear
- bending moment and torsion
- shear and torsion
- bending moment, shear and torsion
Q8 | Pick up the correct statement from the following:
- water cement paste hardens due to hydration
- during hardening cement binds the aggregates together
- cement provides strength, durability and water tightness to the concrete
- all the above
Q9 | 'Ware house pack' of cement means
- full capacity of the ware house
- pressure exertion of the bags of upper layers
- pressure compaction of the bags on lower layers
- packing the ware house
Q10 | High carbon content in the steel causes
- decrease in tensile strength but increase in ductility
- increase in tensile strength but decrease in ductility
- decrease in both tensile strength and ductility
- increase in both tensile strength and ductility
Q11 | Particles of 0.002 mm size are that of
- clay
- sand
- gravel
- none of these
Q12 | Ultimate strength of cold drawn high steel wires
- increases with increase in diameter of bar
- decreases with increase in diameter of bar
- does not depend on diameter of bar
- none of the above
Q13 | The cement whose strength is a little lower than the ordinary cement during the first threemonths but attains afterwards the same strength, is known as
- low-heat portland cement
- rapid hardening portland cement
- portland blast slag cement
- portland pozzolana cement
Q14 | The dimensions of a 35 litre forma for measuring aggregates by volume, are:
- length 30 cm, breadth 25 cm, height 30 cm
- length 39 cm, breadth 25 cm, height 32 cm
- length 27 cm, breadth 27 cm, height 48 cm
- length 220 cm, breadth 25 cm, height 40 cm
Q15 | Ratio of permissible stress in direct compression and bending compression is
- less than 1
- between 1 and 1.5
- between 1.5 and 2.0
- greater than 2
Q16 | Concrete containing
- siliceous aggregates, has higher co-efficient of expansion
- igneous aggregates, has intermediate coefficient of expansion
- lime stones, has lowest co-efficient of expansion
- all the above
Q17 | The lower water cement ratio in concrete, introduces
- smaller creep and shrinkage
- greater density and smaller permeability
- improved frost resistance
- all the above
Q18 | In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on
- the front face in one direction
- the front face in both directions
- the inner face in one direction
- the inner face in both directions
Q19 | The aggregate containing moisture in pores and having its surface dry, is known as
- moist aggregates
- very dry aggregates
- dry aggregates
- saturated surface dry aggregate
Q20 | Pick up the correct statement from the following:
- construction joints in columns are provided a few cm below the junction of beam
- construction joints in columns are provided at the bottom hunching
- construction joints in beams and slabs are provided within middle third
- all the above
Q21 | According to ISI recommendations, the maximum depth of stress block for balanced section of abeam of effective depth d is
- 0.43 d
- 0.55 d
- 0.68 d
- 0.85 d
Q22 | Pick up the correct proportions of chemical ingredients of cement
- lime : silica : alumina : iron oxide : 63 : 22 : 6 : 3
- silica : lime : alumina : iron oxide : 63 : 22 : 6 : 3
- alumina : silica : lime : iron oxide : 63 : 22 : 6 : 3
- iron oxide : alumina : silica : lime : 63 : 22 : 6 : 3
Q23 | Internal friction between the ingredients of concrete, is decreased by using
- less water
- fine aggregates
- rich mix
- more water and coarse aggregates
Q24 | Pick up the correct statement from the following:
- the quality of water governs the strength of concrete
- 10% excess of water reduces the strength of concrete by 15%
- 30% excess of water reduces the strength of concrete by 50%
- all the above
Q25 | Pick up the correct statement from the following:
- lime in excess, causes the cement to expand and disintegrate
- silica in excess, causes the cement to set slowly
- alumina in excess, reduces the strength of the cement
- all the above