Setting time
Tensile strength
Consistency
All the above
D. All the above
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
(i) and (ii)
(ii) and (iii)
Only (iii)
All (i), (ii) and (iii)
5 % less
10 % less
5 % more
10 % more
Increases
Decreases
Fluctuates
Remains constant
Sand stone
Slate
Lime stone
Graphite
20 %
25 %
30 %
35 %
Economy
Durability
Workability
All the above
Aggregates
Cement
Water
All the above
Elastic modulus of high tensile steel is nearly the same as that of mild steel
Elastic modulus of high tensile steel is more than that of mild steel
Carbon percentage in high carbon steel is less than that in mild steel
High tensile steel is cheaper than mild steel
Water cement ratio is reduced
Proportion of aggregates is reduced
An allowance for the entrained air is made
All the above
Less water
Fine aggregates
Rich mix
More water and coarse aggregates
Sand obtained from pits, is washed to remove clay and silt
Sand obtained from flooded pits, need not be washed before use
The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
All the above
Has strength less than 10% to 15%
Has more resistance to weathering
Is more plastic and workable
Is free from segregation and bleeding
25 %
40 %
60 %
80 %
Chemically inert
Sufficiently strong
Hard and durable
All the above
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
Made with cement concrete
Thick and reinforced
Thin and heavily reinforced
Thick and heavily reinforced
Concrete for which preliminary tests are conducted, is called controlled concrete
Bulking of sand depends upon the fineness of grains
Concrete mix 1 : 6 : 12, is used for mass concrete in piers
All the above
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
Very fine sand
Fine sand
Medium sand
Coarse sand
To provide adequate bond stress
To resist tensile stresses
To impart initial compressive stress in concrete
All of the above
Is proportional to water content is the mix
Is proportional to cement concrete
Increases with age of concrete
All the above
2.0 to 3.5
3.5 to 5.0
5.0 to 7.0
6.0 to 8.5
600 mm
750 mm
900 mm
More than 1 m
Shape
Grading
Compaction
All the above
Extremely low
Very low
Low
High
3 days
7 days
21 days
28 days
100 kg/cm2
150 kg/cm2
200 kg/cm2
250 kg/cm2
Desired strength and workability
Desired durability
Water tightness of the structure
All the above
Compressive and tensile
Tensile and compressive
Both compressive
Both tensile