Subject - Concrete
Q.1
The split tensile strength of M 15 grade concrete when expressed as percentage of its compressive strength is
10 to 15%
15 to 20%
Q.2
The approximate ratio in between the strengths of cement concrete at 7 days and at 28 days is
a)3/4
b)2/3
Q.3
Modulus of elasticity of M 25 concrete as determined by formula of IS:456 is
1,24,500 MPa
28,500 MPa
Q.4
Tensile strength of concrete is measured by
Applying compressive load along the diameter of the cylinder
Direct tension test in the universal testing machine
Q.5
The approximate ratio of strength of 15cm* 30 cm concrete cylinder to that of 15 cm cube of the same concrete is
0.85
0.50
Q.6
If in a concrete mix the fineness modulus of coarse aggregate is 7.6, the fineness modulus of fine aggregate is 2.8 and the economical value of the fineness modulus of combined aggregate is 6.4, then the proportion of fine aggregate is
25%
33 1/3%
Q.7
General shrinkage in cement concrete is caused by
Drying with starting with a stiff consistency
Drying with starting with a wetter consistency
Q.8
Weight-batching proceeds on
The assumption of correct dry weight of each size range of each material and the weight of water
Accurately estimating the weight of each material to be used in each batch
Q.9
The optimum number of revolutions over which concrete is required to be mixed in a mixer machine is
20
50
Q.10
To make one cubic meter of 1 : 2 : 4 by volume concrete, the volume of coarse aggregates required is
0.85 m3
0.95 m3
Q.11
Batching refers to
Controlling the quantity of each material into each batch
Adjusting the water to be added in each batch according to the moisture content of the materials being mixed in the batch
Q.12
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