8. The grade of concrete generally not used in the rein-forced concrete, is
A.M 10
B. M 15
C. M 20
D. M 40.

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9. The characteristic strength of concrete is the strength of material if its test result is not less than
A.2%
B.3%
C.4%
D.5%

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10. If fck is characteristic compressive strength of concrete, the flexural and split tensile strength fr = a .Nifek N/mm2 where the value of a is
A.0.4
B.0.5
C.0.6
D.0.7

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11. If fah is the characteristic cube strength of concrete in N/mm2, the modulus of elasticity of structural concrete E =coffii; where the value of a, is
A.5900
B.5800
C.5700
D.5600

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12.  Creep of concrete is assumed proportional to the stress if the stress does not exceed ..... of the characteristic compressive strength
A.15%
B.20%
C.25%
D.33%

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13.  The creep coefficient i.e. the ratio of ultimate creep and elastic strain after
A. 7 days is 2.2
B. 28 days is 1.6
C. 365 days is 1.1
D. all the above.

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14. For concreting of heavily reinforced sections without vibration, the workability of concrete should be
A. very low
B. low
C. medium
D. high.

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