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

251. 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

252. 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

253. 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

254. Approximate permissible tensile strength of concrete M15 , is

a ) 150 kg / cm²

b ) 15 kg / cm

c ) 150 N / mm²

d ) 15 N / mm²

255. 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

256. 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

257. 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

258. 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

259. Working stress design assumes

a ) elastic stress – strain relation

b ) linear stress – strain relation

c ) elastic and linear stress – strain relation

d ) isotropic material

260. 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

261. 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

262. 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

263. The ultimate bending compressive strain in RCC is

a ) 0.003

b ) 0.0035

c ) 0.0003

d ) none of the above

63.

264. 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

266. 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

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

a ) M15

b ) M20

c ) M10

d ) M25

268. The unit weight of RCC concrete is

a ) 2300 kg / m

b ) 2400 kg / m³

c ) 2500 kg / m³

d ) 2000 kg / m³

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

a ) tensile

b ) compression

c ) tortion

d ) all of the above

270. 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

271. 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

272. 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

273. 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

274. 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

275. 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

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