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
