MCQ Questions Civil Engineering Concrete Technology and Design of Concrete Structures
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MCQ Questions Civil Engineering Concrete Technology and Design of Concrete Structures - Set - 4
Question 1:
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is
a) M15
b) M20
c) M 10
d) M25
Correct Answer – (A)
Question 2 :
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
a) 0.35 d
b) 0.40 d
c) 0.45 d
d) dependent on grade of concrete also
Correct Answer – (B)
Question 3 :
If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called
a) balanced beam
b) under-reinforced beam
c) over-reinforced beam
d) none of the above
Correct Answer – (C)
Question 4 :
If a beam fails in bond, then its bond strength can be increased most economi-cally by
a) increasing the depth of beam
b) using thinner bars but more in number
c) using thicker bars but less in number
d) providing vertical stirrups
Correct Answer – (B)
Question 5 :
For a reinforced concrete section, the shape of shear stress diagram is
a) wholly parabolic
b) wholly rectangular
c) parabolic above neutral axis and rectangular below neutral axis
d) rectangular above neutral axis and parabolic below neutral axis
Correct Answer – (C)
MCQ Questions Civil Engineering Concrete Technology and Design of Concrete Structures
Question 6:
Modulus of elasticity of steel as per IS : 456-1978 shall be taken as
a) 20 kN/cm2
b) 200 kN/cm2
c) 200kN/mm2
d) 2xl06N/cm2
Correct Answer – (C)
Question 7:
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section
a) depends on as, only
b) depends on aCbC only
c) depends on both crest and acbc
d) is independent of both ast and acbc where d is the effective depth, ast is permissible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
Correct Answer – (A)
Question 8:
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to
a) xv
b) xc
c) xv – TC
d) Tv + Tc
Correct Answer – (C)
Question 9:
Diagonal tension in a beam
a) is maximum at neutral axis
b) decreases below the neutral axis and increases above the neutral axis
c) increases below the neutral axis and decreases above the neutral axis
d) remains same
Correct Answer – (C)
Question 10:
Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Correct Answer – (B)
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