21.As compared to ordinary portland cement, high alumina cement has
higher initial setting time but lower final setting time
22. Modulus of rupture of concrete is a measure of flexural tensile strength
23. In order to obtain the best workability of concrete, the preferred shape of aggregate is rounded
24. The effect of adding calcium chloride in concrete is to increase shrinkage
to decrease setting time
25. Bulking of sand is maximum if moisture content is about 4%
26.Finer grinding of cement affects only the early development of strength
27. Poisson's ratio for concrete increases with richer mixes
28. 1% of voids in a concrete mix would reduce its strength by about 5%
29. The fineness modulus of fine aggregate is in the range of 2.0 to 3.5
30.The factor of safety for steel is lower than that for concrete
31. Examine the following statements Factor of safety for steel should be based on its yield stress,Factor of safety for concrete should be based on its ultimate stress
32. For a reinforced concrete section, the shape of shear stress diagram is parabolic above neutral axis and rectangular below neutral axis
33. Diagonal tension in a beam increases below the neutral axis and decreases above the neutral axis
34. If a beam fails in bond, then its bond strength can be increased most economically by using in inner bars but more in number
35.If nominal shear stress Tv exceeds the design shear strength of concrete Tc, the
nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a
shear stress equal to Tv = Tc
36. If the depth of actual neutral axis in a beam is more than the depth of critical
neutral axis, then the beam is called over-reinforced beam
37. If the depth of neutral axis for a singly reinforced rectangular section is re
presented by kd in working stress design, then the value of k for balanced section
depends on σst only
38. If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be 0.40 d
39. Modulus of elasticity of steel as per IS : 456-1978 shall be taken as 200kN/mm2
40.Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is M15
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