rcc structures design Mcqs
151. As the percentage of steel increases________________?
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A. Lever arm increases

B. Depth of neutral axis decreases

C. Depth of neutral axis increases

D. Lever arm decreases

152. The thickness of base slab of a retaining wall generally provided, is_____________?
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A. Width of the stem at the bottom

B. One -third of the width of the stem at the bottom

C. One fourth of the width of the steam at the bottom

D. One half of the width of the stem at the bottom

153. In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
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A. More loaded column

B. A point of the maximum shear force

C. A point of zero shear force

D. Less loaded column

154. The maximum area of tension reinforcement in beams shall not exceed_______________?
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A. 4 %

B. 1.50%

C. 1%

D. 0.15%

155. The weight of reinforced concrete, is generally taken as______________?
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A. 2200 kg/m3

B. 2400 kg/m3

C. 2300 kg/m3

D. 2500 kg/m3

156. The minimum cube strength of concrete used for a pre-stressed member, is________________?
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A. 150 kg/cm 2

B. 50 kg/cm2

C. 350 kg/cm2

D. 250 kg/cm2

157. An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is__________________?
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A. 176 cm

B. 300 cm

C. 236 cm

D. 233 cm

158. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is_______________?
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A. 21.5 kg/cm 2

B. 11.4 kg/cm2

C. 8.3 kg/cm2

D. 7.6 kg/cm2

159. Based on punching shear consideration, the overall depth of a combined footing under a column A, is_______________?
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A. None of these

B. (Perimeter of column A Safe punching stress)/(Load on column A Upward pressure Area of the column)

C. (Perimeter of column A Safe punching stress)/(Load on column A + Upward pressure Area of the column)

D. (Area of the column A Safe punching stress)/Load on column A

160. The effective span of a simply supported slab, is_______________?
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A. Distance between the centres of the bearings

B. Clear span plus effective depth of the slab

C. None of these

D. Clear distance between the inner faces of the walls plus twice the thickness of the wall
161. Design of R.C.C. cantilever beams, is based on the resultant force at______________?
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A. Mid span and fixed support

B. Free end

C. Mid span

D. Fixed end
162. In a pre-stressed beam carrying an external load W with a bent tendon is having angle of -stressed load P. The net downward load at the centre is_________________?
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A. W P

B. W 2P

C. W P

D. W 2P

163. If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is_____________?
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A. 2300/2C

B. 2800/C

C. 2800/C2

D. 2800/3C
164. If is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is________________?
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A. 0.7 H

B. 0.4 H

C. 0.5 H

D. 0.3 H

165. If the average bending stress is 6 kg/cm2 for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is__________________?
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A. 48 d

B. 28 d

C. 38 d

D. 58 d
166. In a beam the local bond stress Sb, is equal to_______________?
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A. Leaver arm/(Shear force Total perimeter of reinforcement)

B. Shear force/(Leaver arm Total perimeter of reinforcement)

C. Leaver arm/(Bending moment Total perimeter of reinforcement)

D. Total perimeter of reinforcement/(Leaver arm Shear force)

167. If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by_________________?
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A. 0.5

B. 0.4

C. 0.2

D. 0.3

168. A foundation is called shallow if its depth, is________________?
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A. Equal to its width

B. One-fourth of its width

C. Half of its width

D. Three-fourth of its width

169. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30 and 2000 kg respectively, the effective width of the stem at the bottom, is_______________?
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A. 54.5

B. 53.5

C. 51.5

D. 52.5

170. The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is_________________?
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A. 35

B. 25

C. 40

D. 30

171. The design of a retaining wall assumes that the retained earth________________?
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A. Is dry

172. On an absolutely rigid foundation base, the pressure will________________?
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A. Be zero at the centre of the foundation

B. Be uniform

C. Be more at the edges of the foundation

D. Not be uniform
173. If Sb, is the average bond stress on a bar of diameter subjected to maximum stress , the length of the embedment is given by_____________?
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A. l = dt/3Sb

B. l = dt/2Sb

C. l = dt/Sb

D. l = dt/4Sb
174. Piles are usually driven by________________?
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A. Diesel operated hammer

B. Single acting steam hammer

C. Drop hammer

D. All the above
175. If T and R are tread and rise respectively of a stair, then_______________?
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A. R + 2 T = 60

B. 2R + T = 60

C. R + 2 T = 30

D. 2R + T = 30

176. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is________________?
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A. 0.207 L

B. 0.407 L

C. 0.107 L

D. 0.307 L

177. If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least________________?
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A. WL/3P

B. WL /P

C. WL/2P

D. WL/4P
178. If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is______________?
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A. cAc + m cAsc

B. All the above

C. c[A + (m 1)ASC]

D. c(A Asc) + m cAsc

179. The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm 2 respectively. If m = 15, the depth of its neutral axis is_______________?
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A. 25 cm

B. 20 cm

C. 30 cm

D. 35 cm

180. If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than________________?
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A. WL/12 (L D/3)

B. WL/10 (L + 2D/3)

C. WL/12 (L 2D/3)

D. WL/10 (L 2D/3)
181. The horizontal portion of a step in a stairs case, is known as_________________?
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A. Flight

B. Tread

C. Rise

D. Winder

182. If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is______________?
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A. 37 cm

183. If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept_______________?
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A. 3.5 m

B. 4.0 m

C. 4.5 m

D. 3.0 m

184. If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
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A. (5/6) (r/1 + r4) M

B. (5/6) (r/1 + r) M

C. (5/6) (r/1 + r) M

D. (5/6) (r/1 + r3) M

185. A foundation rests on_______________?
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A. Base of the foundation

B. Sub-grade

C. Foundation soil

D. Both B. and C
186. The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called_________________?
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A. Economic section

B. Critical section

C. All the above

D. Balanced section

187. Pick up the correct statement from the following?
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A. Lateral reinforcement stops breaking away of concrete cover, due to buckling

B. All the above

C. Lateral reinforcement prevents the shearing of concrete on diagonal plane

D. Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling

188. A flat slab is supported_______________?
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A. On beams

B. On beams and columns

C. On columns

D. On columns monolithically built with slab
189. A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is____________________?
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A. n1 (1 n1/3) cbd

B. All the above

C. bn (fc/2) (d n/3)

D. Atft (d n/3)

190. According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than______________?
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A. 15 cm

B. 20 cm

C. 5 cm

D. 10 cm

191. The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon____________________?
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A. All the above

B. Breadth of the rib

C. Overall thickness of the rib

D. Centre to centre distance between T-beams

192. If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is________________?
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A. 200 cm

B. 100 cm

C. 300 cm

D. 150 cm
193. The radius of a bar bend to form a hook, should not be less than_______________?
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A. Four times the diameter

B. Thrice the diameter

C. Twice the diameter

D. Five times the diameter

194. The maximum diameter of a bar used in a ribbed slab, is______________?
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A. 12 mm

B. 20 mm

C. 6 mm

D. 22 mm
195. effective depth and depth of the neutral axis respectively of a singly reinforced If d and n are the beam, the lever arm of the beam, is_________________?
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A. n

B. d

C. d n/3

D. d + n/3

196. An R.C.C. column is treated as long if its slenderness ratio is greater than____________?
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A. 35

B. 30

C. 40

D. 50
197. According to the steel beam theory of doubly reinforced beams______________?
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A. Stress in tension steel equals the stress in compression steel

B. Tension is resisted by tension steel

C. Compression is resisted by compression steel

D. All the above
198. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be_________________?
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A. 15 cm

B. 10 cm

C. 20 cm

D. 5 cm

199. To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than________________?
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A. b/3

B. b/4

C. b/5

D. b/6
200. A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is______________?
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A. 2

B. Less than 2

C. Less than 2.5

D. 2.5