367 + Mcqs in RCC Structures Design Page 4 McqOptions

151.	If the length of a combined footing for two columns l metres apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where x is the distance of centre of gravity of column loads).
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

152.	The width of the flange of a L-beam, should be less than
A.	one-sixth of the effective span
B.	breadth of the rib + four times thickness of the slab
C.	breadth of the rib + half clear distance between ribs
D.	least of the above.
Answer» E.

Discussion

153.	The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stressess simultaneously, is called
A.	balanced section
B.	economic section
C.	critical section
D.	all the above.
Answer» E.

Discussion

154.	The spacing of transverse reinforcement of column is decided by the following consideration.
A.	The least lateral dimension of the column
B.	Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
C.	Forty-eight times the diameter of transverse reinforcement
D.	All the above.
Answer» E.

Discussion

155.	An R.C.C. roof slab is designed as a two way slab if
A.	it supports live loads in both directions
B.	the ratio of spans in two directions is less than 2
C.	the slab is continuous over two supports
D.	the slab is discontinuous at edges.
Answer» C. the slab is continuous over two supports

Discussion

156.	The live load to be considered for an inaccessible roof, is
A.	Nil
B.	75 kg/m²
C.	150 kg/cm²
D.	200 kg/m²
Answer» C. 150 kg/cm²

Discussion

157.	If T and R are tread and rise respectively of a stair, then
A.	2R + T = 60
B.	R + 2T = 60
C.	2R + T = 30
D.	R + 2T= 30
Answer» B. R + 2T = 60

Discussion

158.	The Total pressure on the vertical face of a retaining wall of height h exerted by the retained earth weighing w per unit volume having an angle of surcharge α°, is :
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

159.	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
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

160.	If At is the gross area of steel in tension, d is the effective depth of the beam and y is the depth of the centre of gravity of the resultant compression, the moment of resistance M of the beam, is given by
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

161.	If jd is the lever arm and ΣO is the total perimeter of reinformcement of an R.C.C. beam, the bond stress at the section having Q shear force, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

162.	Total pressure on the vertical face of a retaining wall of height h per unit run exerted by the retained earth weighing w per unit volume, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

163.	For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
A.	10
B.	15
C.	20
D.	25
Answer» D. 25

Discussion

164.	Distribution reinforcement in a simply supported slab, is provided to distribute
A.	load
B.	temperature stress
C.	shrinkage stress
D.	all the above.
Answer» E.

Discussion

165.	If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as
A.	Wl²/4
B.	Wl²/8
C.	Wl²/10
D.	Wl²/12
Answer» C. Wl²/10

Discussion

166.	The thickness of base slab of a retaining wall generally provided, is
A.	one half of the 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.	width of the stem at the bottom
Answer» E.

Discussion

167.	Design of R.C.C. cantilever beams, is based on the resultant force at
A.	fixed end
B.	free end
C.	mid span
D.	mid span and fixed support.
Answer» B. free end

Discussion

168.	Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
A.	are curtailed if not required to resist the bending moment
B.	are bent up at suitable places to serve as shear reinforcement
C.	are bent down at suitable places to serve as shear reinforcement
D.	are maintained at bottom to provide at least local bond stress.
Answer» D. are maintained at bottom to provide at least local bond stress.

Discussion

169.	A per IS : 1343, total shrinkage for a pretensioned beam, is
A.	3.0 x 10^-2
B.	3.0 x 10^-3
C.	3.0 x 10^-4
D.	3.5 x 10^-5
Answer» E.

Discussion

170.	If H is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
A.	0.3 H
B.	0.4 H
C.	0.5 H
D.	0.7 H
Answer» E.

Discussion

171.	Top bars are extended to the projecting parts of the combined footing of two columns L distance apart for a distance of
A.	0.1 L from the outer edge of column
B.	0.1 L from the centre edge of column
C.	half the distance of projection
D.	one-fourth the distance of projection.
Answer» C. half the distance of projection

Discussion

172.	If bending moment is M, shear force is F effecive depth is d, lever arm is la area of reinforcement is As and sum of the circumferences of main reinforcement is 0, the bond stress based on working stress method, is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

173.	If permissible compressive stress in concrete is 50 kg/cm², tensile stress in steel is 1400 kg/cm² and modular ratio is 18, the depth d of the beam, is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

174.	If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a superload on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

175.	If Md and Mt are the maximum bending moments due to dead load and live load respectively and F is the total effective pressure, for a balanced design of a prestreseed concrete beam of steel, is
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

176.	According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
A.	5 kg/cm²
B.	10 kg/cm²
C.	15 kg/cm²
D.	20 kg/cm²
Answer» B. 10 kg/cm²

Discussion

177.	A foundation rests on
A.	base of the foundation
B.	subgrade
C.	foundation soil
D.	both (b) and (c)
Answer» E.

Discussion

178.	A short column 20 cm x 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm² and 300 kg/cm², the Safe load on the column, should not exceed
A.	4120 kg
B.	41, 200 kg
C.	412, 000 kg
D.	none of these.
Answer» C. 412, 000 kg

Discussion

179.	The number of treads in a flight is equal to
A.	risers in the flight
B.	risers plus one
C.	risers minus one
D.	none of these.
Answer» D. none of these.

Discussion

180.	If the neutral axis of a T-beam is below the slab, the relationship between the flange width B, depth of neutral axis n, thickness of the slab ds, effective depth of the beam d, gross area of tensile steel At and the modular ratio m may be stated as
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

181.	If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is :
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

182.	If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given b
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

183.	P is the prestressed force applied to the tendon of a rectangular prestressed beam whose area of cross section is A and sectional modulus is Z. The maximum stress f in the beam, subjected to a maximum bending moment M, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

184.	If Sb, is the average bond stress on a bar of diameter d subjected to maximum stress t, the length of the embedment l is given by
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

185.	In a doubly-reinforced beam if c and t are stresses in concrete and tension reinforcement, d is the effective depth and n is depth of critical neutral axis n, the following relationship holds good
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

186.	If W is the load on a circular slab of radius R, the maximum radial moment at the centre of the slab, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

187.	A pile weighing W1 kg penetrates S metres with its last blow. If W2 is the weight of the hammer having a drop of H metres, the pile can carry a maximum external load
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

188.	If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

189.	If p is the net upward pressure on a square footing of side b for a square column of side a, the maximum bending moment is given by
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

190.	The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
A.	10 mm
B.	15 mm
C.	20 mm
D.	25 mm
Answer» E.

Discussion

191.	An R.C.C. column is treated as long if its slenderness ratio is greater than
A.	30
B.	35
C.	40
D.	50
Answer» E.

Discussion

192.	The transverse reinforcements provided at right angles to the main reinforcement
A.	distribute the load
B.	resist the temperature stresses
C.	resist the shrinkage stress
D.	all the above.
Answer» E.

Discussion

193.	Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
A.	h/4
B.	h/3
C.	h/2
D.	2h/3
Answer» C. h/2

Discussion

194.	P is the prestressed force applied to tendon of a rectangular prestressed beam whose area of cross section is A and sectional modulus is Z. The minimum stress f on the beam subjected to a maximum bending moment M is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

195.	If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
A.	R + T
B.	T-R
C.	√R2 + T2
D.	R-T
Answer» D. R-T

Discussion

196.	The percentage of minimum reinforcement of the gross sectional area in slabs, is
A.	0.10%
B.	0.12%
C.	0.15%
D.	0.18%
Answer» D. 0.18%

Discussion

197.	f l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2 acting on strips parallel to l2 and l1 is
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

198.	Cantilever retaining walls can safely be used for a height not more than
A.	3 m
B.	4 m
C.	5 m
D.	6 m
Answer» E.

Discussion

199.	If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
A.	40
B.	45
C.	50
D.	55
Answer» E.

Discussion

200.	Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at
A.	supports
B.	mid span
C.	every section
D.	quarter span.
Answer» C. every section

Discussion

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If bending moment is M, shear force is F effecive depth is d, lever arm is la area of reinforcement is As and sum of the circumferences of main reinforcement is 0, the bond stress based on working stress method, is

If permissible compressive stress in concrete is 50 kg/cm², tensile stress in steel is 1400 kg/cm² and modular ratio is 18, the depth d of the beam, is

If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a superload on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

If Md and Mt are the maximum bending moments due to dead load and live load respectively and F is the total effective pressure, for a balanced design of a prestreseed concrete beam of steel, is

According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

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A short column 20 cm x 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm² and 300 kg/cm², the Safe load on the column, should not exceed

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If the neutral axis of a T-beam is below the slab, the relationship between the flange width B, depth of neutral axis n, thickness of the slab ds, effective depth of the beam d, gross area of tensile steel At and the modular ratio m may be stated as

If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is :

If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given b

P is the prestressed force applied to the tendon of a rectangular prestressed beam whose area of cross section is A and sectional modulus is Z. The maximum stress f in the beam, subjected to a maximum bending moment M, is

If Sb, is the average bond stress on a bar of diameter d subjected to maximum stress t, the length of the embedment l is given by

In a doubly-reinforced beam if c and t are stresses in concrete and tension reinforcement, d is the effective depth and n is depth of critical neutral axis n, the following relationship holds good

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If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

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