Multiple Choice Questions (MCQ) On Design of R.C.C. Structuresc (Part 1)

1. When mild steel is used for RCC beam then the value of ultimate depth of neutral axis (Xumax) is taken as..........

a) 0.46d

b) 0.48d

c) 0.50d

d) 0.53d

(d = Effecive depth of beam)

Answer: d) 0.53d

2. Partial safety factor for steel under limit state of collapse is..........

a) 1.2

b) 1.15

c) 1.23

d) 1.5

Answer: b) 1.15

3. According to IS Code 456:2000 the maximum strain in concrete is..........

a) 0.002

b) 0.003

c) 0.0035

d) 0.0036

Answer: c) 0.0035

4. For Fe 415 grade steel the limiting moment of resistance (M_ulim) is taken as..........

a) 0.138 f_ck bd²

b) 0.128 f_ck bd²

c) 0.148 f_ck bd²

d) 0.118 f_ck bd²

Answer: a) 0.138 f_ck bd²

5. Partial safety factor for concrete material under limit state of collapse is taken as..........

a) 1

b) 1.15

c) 1.2

d) 1.5

Answer: d) 1.5

6. If Xumax is limiting or maximum depth of neutral axis and Xu is actual depth of neutral axis then, for balanced section ............

a) Xumax > Xu

b) Xumax < Xu

c) Xumax = Xu

d) All the above

Answer: c) Xumax = Xu

7. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called as ............

a) Under-reinforced section

b) Over-reinforced section

c) Balanced section

d) Economic section

Answer: b) Over-reinforced section

8. For footing minimum clear cover should be ............

a) 12 mm

b) 25 mm

c) 40 mm

d) 50 mm

Answer: d) 50 mm

9. An under-reinforced section means ............

a) Steel will yield first

b) Concrete yield first

c) Steel provided on one face only

d) Steel is provided at the under side only

Answer: a) Steel will yield first

10. The section of a reinforced beam where most distant concrete fiber in compression and tension in steel attains permissible stresses simultaneously, is called as ............

a) Balanced section

b) Economic section

c) Critical section

d) All the above

Answer: d) All the above

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