Civil engineer objective questions – Structural Analysis and Design (Section-11)

1. In a RCC beam , as the percentage of steel increases

a ) depth of neutral axis decreases

b ) depth of neutral axis increases

c ) lever arm decreases

d ) lever arm increases

2. In case of under reinforced section

a ) concrete fails first

b ) steel fails first

c ) concrete and steel fail at a time

d ) none of the above

3. An under reinforced section means

a ) steel is provided at under side only

b) steel provided is insufficiently

c) steel is provided on one face only

d) concrete first fail

1. The approximate allowable stress in axial compression in RCC is

a ) 0.25fck

b ) 0.33 fek

c ) 0.44fck

d ) none of the above

4. The tensile strength of concrete for RCC beam design is

a ) 0.2fck

b ) 0.1 fck

c ) 0.0fck

d ) none of the above

5. The permissible bearing stress on full area of concrete shall be taken as

a ) 0.25fck

b ) 0.33fck

c ) 0.44fck

d ) none of the above

6. Approximate permissible tensile strength of concrete M15 , is

a ) 150 kg / cm²

b ) 15 kg / cm

c ) 150 N / mm²

d ) 15 N / mm²

7. The maximum diameter of bars in beam is limited to

a ) one tenth of the depth of beams

b ) one eighth of the least dimension of the beams

c ) 40 mm

d ) 25mm

8. The transverse torsion reinforcement in RCC beams can be provided as

a ) ties

b ) closed loops only

c ) open or closed loops

d ) helical loops

9. In R.C.C. beams , the tension reinforcement can be cut off at a point when it is no longer needed if

a ) enough bond length is available

b ) shear force is maximum

c ) bending moment is zero

d ) shear at cut off point does not exceed two third

10. Minimum compressive strength of concrete should not be less than for mis concrete at the age of 7 days

a ) 7.5 N / mm

b ) 10 N / mm²

c ) 15 N / mm²

d ) 2.14 N / mm²

11. The design shear stress in reinforced cement concrete depends on

a ) characteristic strength of concrete

b ) percentage of longitudinal tensile reinforcement On

c ) characteristic strength of steel

d ) both ( a ) and ( b ) of above

12. The maximum shear stress permitted in reinforced cement concrete member depends upon

a ) grade of concrete

b ) percentage of longitudinal tensile reinforcement

c ) shear reinforcement provided

d ) all of the above

13. Minimum grade of concrete to be used in reinforced concrete ( IS 456-2000 )

a ) M15

b ) M20

c ) M10

d ) M25

14. The unit weight of RCC concrete is

a ) 2300 kg / m

b ) 2400 kg / m³

c ) 2500 kg / m³

d ) 2000 kg / m³

15. When a member is stretched along its axis , the force produced is

a ) tensile

b ) compression

c ) tortion

d ) all of the above

16. The nominal shear stress in beams of M15 grade concrete under no circumstances shall exceed

a ) 2.5 N / mm²

b ) 1.5 N / mm²

c ) 0.5 N / mm²

d ) none of the above

17. Working stress design assumes

a ) elastic stress – strain relation

b ) linear stress – strain relation

c ) elastic and linear stress – strain relation

d ) isotropic material

18. Working stress design assumes

a ) partial recovery of deflections caused during some load conditions

b ) full recovery of deflections caused during some load conditions

c ) partial recovery of deflections caused in all types of load conditions

d ) full recovery of deflections caused in all types of load conditions

19. The stress caused by different loads c an be superimposed by

a ) working stress design

b ) ultimate strength design

c ) limit state design

d ) plastic design

20. The ratio of modulus of elasticity of steel to that of concrete is

a ) modular ratio

b ) poison’s ratio

c ) elasticity ratio

d ) none of the above

21. Modulus of elasticity for steel as per IS 456-1978 is

a ) 2×106 N / cm²

b ) 200 KN / mm²

c ) 200 KN / cm²

d ) 20 KN / mm²

22. In the working stress design , the allowable bending compressive strain in RCC is

a ) 0.003

b ) 0.0003

c ) 0.002

d ) none of the above

23. The ultimate bending compressive strain in RCC is

a ) 0.003

b ) 0.0035

c ) 0.0003

d ) none of the above

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