Colour
Strength
Controlling setting time
None of these
C. Controlling setting time
Equal to the mean size
Twice the mean size
Thrice the mean size
Four times the mean size
(i) and (ii)
(ii) and (iii)
Only (iii)
All (i), (ii) and (iii)
Workability
Strength
The effects of temperature variations
The unit weight
Made with cement concrete
Thick and reinforced
Thin and heavily reinforced
Thick and heavily reinforced
Increasing the depth
Providing shear reinforcement
Using high strength steel
Using thinner bars but more in number
Only (i)
(i) and (ii)
(i) and (iii)
All (i), (ii) and (iii)
Area of each aggregate pile should be large
Height of each aggregate pile should not exceed 1.50 m
Aggregate pile should be left for 24 hours before aggregates are used
All the above
100 kg/cm2
150 kg/cm2
200 kg/cm2
250 kg/cm2
Less than 1
Between 1 and 1.5
Between 1.5 and 2
Greater than 2
Porous
Non-homogeneous
Reduced strength
All the above
2 %
4 %
6 %
10 %
The bottom and top ends of slump mould are parallel to each other
The axis of the mould is perpendicular to the end faces
The internal surface of the mould is kept clean and free from set cement
The mould is in the form of a frustum of hexagonal pyramid
M 15
M 20
M 10
M 25
Size and shape of aggregates
Specific gravity of aggregates
Grading of aggregates
Size and shape of the container
Bleeding
Creeping
Segregation
Shrinkage
Residual does not exceed 10% when sieved through IS Sieve No. 9
Soundness varies from 5 to 10 mm
Initial setting time is not less than 30 minutes
Compressive stress after 7 days, is not less than 175 kg/cm2
Chemically inert
Sufficiently strong
Hard and durable
All the above
0.03 %
0.1 %
0.3 %
3 %
1 : 3 : 6 mix
1 : 1 :2 mix
1 : 2 : 4 mix
1 : 1.5 : 3 mix
Grading of aggregates
Surface area of aggregates
Shape of aggregates
All the above
± 5 % of average
± 10 % of average
± 15 % of average
± 20 % of average
10 kg
12 kg
14 kg
16 kg
The degree of grinding of cement, is called fineness
The process of changing cement paste into hard mass, is known as setting of cement
The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
The heat generated during chemical reaction of cement with water, is known as heat of hydration
Lean mixes bleed more as compared to rich ones.
Bleeding can be minimized by adding pozzolana finer aggregate
Bleeding can be increased by addition 'of calcium chloride
None of the above
Low water cement ratio
Less cement in the concrete
Proper concrete mix
All the above
Shear strength
Tensile strength
Compressive strength
None of these
Consistency
Compressive strength
Tensile strength
Impact value
One cantilever
Two cantilevers
Three cantilevers
Four cantilevers
Tensile strength test
Slump test
Compaction factor test
Flexural strength test
0.15% to 2%
0.8% to 4%
0.8% to 6%
0.8% to 8%