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CONCRETE TECHNOLOGY MOST IMPORTANT QUESTIONS FOR RPSC AE, SSC JE, MP VYAPAM, BPSC
Q1 Strength of concrete is directly proportional to
2 points
water cement ratio
cement water ratio
sand cement ratio
water aggregate ratio
Q2 The durability of concrete is directly proportional to
2 points
water cement ratio
cement water ratio
cement aggregate ratio
water aggregate ratio
Q3 The slump test of concrete is to used measured its
2 points
consistency
tensile and compressive strength
impact value
homogeneity
Q4 For most of the applications,water to cement ratio should be between
2 points
.4 to.5
.5 to .55
.55 to .6
.6 to .65
Q5 The minimum cement content in moderately exposed reinforced concrete with normal weight aggregate of 20mm nominal maximum size
2 points
220 kg /m3
240 kg /m3
280 kg /m3
300 kg /m3
Q6 For light weight reinforced section in slabs,beams,column etc the slump should be
2 points
15 - 25 mm
25 - 75 mm
50 -100 mm
75 -100 mm
Q7 Aluminium powder in concrete is used as
2 points
retarder
air entraining agent
accelerator
super plasticizer
Q8 The height of mould used for slump test is
2 points
450 mm
300 mm
200 mm
100 mm
Q9 In case of a framed rcc construction ,the form work is removed first are
2 points
bottom of the beam
bottom of the roof slab
sides of beam
any bottom of beams or bottom of roof slab
Q10 Grading of aggregate in concrete mix is necessary to achieve
2 points
adequate workability
higher density
reduction in voids
better durability
Q11 The pH value of water for quality concrete shall not be less than
2 points
2
4
6
12
Q12 The normal consistency of ordinary portland cement is about
2 points
10%
20%
30%
40%
Q13 The ratio of 28 days strength of cube to that of a standard cylinder is
2 points
.8
1.25
.67
1
Q14 In a concrete mix of proportion 1:3:6 the actual quantity of sand which is judged to have under go 15% of bulking ,per unit volume of cement will be
2 points
3
3.45
4.5
6
Q15 What is the target mean strength (N/mm2) of M30 grade of concrete ,if standard deviation is 5
2 points
21.75
30
38.25
40.25
Q16 In sump test , each layer o concrete is compacted by a tempering rod with
2 points
20 blows
25 blows
30 blows
40 blows
Q17 Flexural strength of concrete is determined as
2 points
modulus of rigidity
modulus of rupture
modulus of plasticity
modulus of elasticity
Q18 Transport of concrete by pump is done for a distance of
2 points
100 m
200 m
300 m
400m
Other:
Q19 After casting, an ordinary cement concrete on drying
2 points
expands
mix
shrinks
none of these.
Other:
Q20 The concrete mix design is conducted as per
2 points
IS10262
IS 13920
IS 383
IS 456
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