204 + Mcqs in Rcc Structures Design Page 3 McqOptions

101.	_ Steel beam theory is used for$?
A.	Design of simple steel beams
B.	Steel beams encased in concrete
C.	Doubly reinforced beams ignoring compressive stress in concrete
D.	Beams if shear exceeds 4 times allowable shear stress
Answer» D. Beams if shear exceeds 4 times allowable shear stress

Discussion

102.	_ The weight of a foundation is assumed as$?
A.	5% of wall weight
B.	7% of wall weight
C.	10% of wall weight
D.	12% of wall weight
Answer» D. 12% of wall weight

Discussion

103.	_ For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed$?
A.	10
B.	15
C.	20
D.	25
Answer» D. 25

Discussion

104.	_ An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encased with the floor of a hall 12 meters by 7 meters, is spaced at 3 meters from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is$?
A.	300 cm
B.	233 cm
C.	176 cm
D.	236 cm
Answer» D. 236 cm

Discussion

105.	_ Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than$?
A.	One diameter of thinner bar
B.	One diameter of thicker bar
C.	Twice the diameter of thinner bar
D.	None of these
Answer» C. Twice the diameter of thinner bar

Discussion

106.	_ A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm¬¨‚â§ steel. If the modular ratio (m) is 15, the depth of the neutral axis, is$?
A.	20 cm
B.	25 cm
C.	30 cm
D.	35 cm
Answer» D. 35 cm

Discussion

107.	_ According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is$?
A.	Half of the width of the slab
B.	Two-third of the width of the slab
C.	Three-fourth of the width of the slab
D.	Four-fifth of the width of the slab
Answer» D. Four-fifth of the width of the slab

Discussion

108.	_ A foundation is called shallow if its depth, is$?
A.	One-fourth of its width
B.	Half of its width
C.	Three-fourth of its width
D.	Equal to its width
Answer» E.

Discussion

109.	_ An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is$?
A.	Safe in shear
B.	Is safe with stirrups
C.	Is safe with stirrups and inclined members
D.	Needs revision of the section
Answer» B. Is safe with stirrups

Discussion

110.	_ After pre-stressing process is completed, a loss of stress is due to$?
A.	Shrinkage of concrete
B.	Elastic shortening of concrete
C.	Creep of concrete
D.	All the above
Answer» E.

Discussion

111.	_ The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon$?
A.	Breadth of the rib
B.	Overall thickness of the rib
C.	Centre to centre distance between T-beams
D.	All the above
Answer» E.

Discussion

112.	_In a pre-stressed member it is advisable to use$?
A.	Low strength concrete only
B.	High strength concrete only
C.	Low strength concrete but high tensile steel
D.	High strength concrete and high tensile steel
Answer» E.

Discussion

113.	_A short column 20 cm ‚àö√≥ 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/cm¬¨‚â§ and 300 kg/cm¬¨‚â§, the Safe load on the column, should not exceed$?
A.	4,120 kg
B.	41,200 kg
C.	412,000 kg
D.	None of these
Answer» C. 412,000 kg

Discussion

114.	_An under-reinforced section means$?
A.	Steel is provided at the underside only
B.	Steel provided is insufficient
C.	Steel provided on one face only
D.	Steel will yield first
Answer» E.

Discussion

115.	_Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension$?
A.	Two times
B.	Three times
C.	Four times
D.	Five times
Answer» D. Five times

Discussion

116.	_The angle of internal friction of soil mass is the angle whose$?
A.	Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
B.	Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
C.	Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
D.	None of these
Answer» B. Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

Discussion

117.	_The minimum number of main steel bars provided in R.C.C.$?
A.	Rectangular columns is 4
B.	Circular columns is 6
C.	Octagonal columns is 8
D.	All the above
Answer» E.

Discussion

118.	_If ‚Äö√Ñ√≤A‚Äö√Ñ√¥ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‚Äö√Ñ√≤P‚Äö√Ñ√¥ through its centroidal longitudinal axis, the compressive stress in concrete, is$?
A.	P/A
B.	A/P
C.	P/2A
D.	2A/P
Answer» B. A/P

Discussion

119.	_Dimensions of a beam need be changed if the shear stress is more than$?
A.	10 kg/cm¬¨‚â§
B.	15 kg/cm¬¨‚â§
C.	20 kg/cm¬¨‚â§
D.	25 kg/cm¬¨‚â§
Answer» D. 25 kg/cm¬¨‚â§

Discussion

120.	_If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment$?
A.	WL/2
B.	WL/4
C.	WL/6
D.	WL/8
Answer» D. WL/8

Discussion

121.	_For stairs spanning horizontally, the minimum waist provided is$?
A.	4 cm
B.	6 cm
C.	8 cm
D.	12 cm
Answer» E.

Discussion

122.	_A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm¬¨‚â§, the area of steel required, is$?
A.	14 cm¬¨‚â§
B.	15 cm¬¨‚â§
C.	16 cm¬¨‚â§
D.	17 cm¬¨‚â§
Answer» D. 17 cm¬¨‚â§

Discussion

123.	_For a number of columns constructed in a rcjw, the type of foundation provided, is$?
A.	Footing
B.	Raft
C.	Strap
D.	Strip
Answer» E.

Discussion

124.	_The maximum ratio of span to depth of a cantilever slab, is$?
A.	8
B.	10
C.	12
D.	16
Answer» D. 16

Discussion

125.	_The design of heel slab of a retaining wall is based on the maximum bending moment due to:$?
A.	Its own weight
B.	Weight of the soil above it
C.	Load of the surcharge, if any
D.	All the above
Answer» E.

Discussion

126.	_In a singly reinforced beam, the effective depth is measured from its compression edge to$?
A.	Tensile edge
B.	Tensile reinforcement
C.	Neutral axis of the beam
D.	Longitudinal central axis
Answer» C. Neutral axis of the beam

Discussion

127.	_The width of the flange of a T-beam should be less than$?
A.	One-third of the effective span of the T-beam
B.	Distance between the centers of T-beam
C.	Breadth of the rib plus twelve times the thickness of the slab
D.	Least of the above
Answer» E.

Discussion

128.	_Pick up the assumption for the design of a pre-stressed concrete member from the following:$?
A.	A transverse plane section remains a plane after bending
B.	During deformation limits, Hook's law is equally applicable to concrete as well as to steel
C.	Variation of stress in reinforcement due to changes in external loading is negligible
D.	All the above
Answer» E.

Discussion

129.	_A pile of length ‚Äö√Ñ√≤L‚Äö√Ñ√¥ carrying a uniformly distributed load ‚Äö√Ñ√≤W‚Äö√Ñ√¥ per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is$?
A.	WL/8
B.	WL¬¨‚â§/24
C.	WL¬¨‚â§/47
D.	WL¬¨‚â§/16
Answer» D. WL¬¨‚â§/16

Discussion

130.	_If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)$?
A.	M/100Q
B.	M/10‚Äö√ √∂Q
C.	‚Äö√ √∂(M/Q)
D.	‚Äö√ √∂(M/100Q)
Answer» E.

Discussion

131.	_The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is$?
A.	30¬¨‚àû
B.	40¬¨‚àû
C.	45¬¨‚àû
D.	All the above
Answer» E.

Discussion

132.	_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

133.	_In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength$?
A.	100 kg/cm¬¨‚â§
B.	200 kg/cm¬¨‚â§
C.	300 kg/cm¬¨‚â§
D.	400 kg/cm¬¨‚â§
Answer» E.

Discussion

134.	_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

135.	_The length of lap in tension reinforcement should not be less than the bar diameter ‚àö√≥ (actual tension / four times the permissible average bond stress) if it is more than$?
A.	18 bar diameters
B.	24 bar diameters
C.	30 bar diameters
D.	36 bar diameters
Answer» D. 36 bar diameters

Discussion

136.	_The pitch of the main bars in a simply supported slab, should not exceed its effective depth by$?
A.	Three times
B.	Four times
C.	Five times
D.	Six times
Answer» E.

Discussion

137.	_If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by$?
A.	ft .d/4fb
B.	(≈ì√Ñ/4). (ft .d/fb)
C.	≈ì√Ñ ft .d¬¨‚â§/fb
D.	(≈ì√Ñ/4). (ft .d3/fb)
Answer» B. (≈ì√Ñ/4). (ft .d/fb)

Discussion

138.	_High strength concrete is used in pre-stressed member$?
A.	To overcome high bearing stresses developed at the ends
B.	To overcome bursting stresses at the ends
C.	To provide high bond stresses
D.	All the above
Answer» E.

Discussion

139.	_The amount of reinforcement for main bars in a slab, is based upon$?
A.	Minimum bending moment
B.	Maximum bending moment
C.	Maximum shear force
D.	Minimum shear force
Answer» C. Maximum shear force

Discussion

140.	_[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by$?
A.	Modular ratio method
B.	Load factor method
C.	Ultimate load method
D.	None of these
Answer» B. Load factor method

Discussion

141.	_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.	‚Äö√ √∂(R¬¨‚â§ + T¬¨‚â§)
D.	R - T
Answer» D. R - T

Discussion

142.	_If ‚Äö√Ñ√≤H‚Äö√Ñ√¥ 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

143.	_A ribbed slab is provided for$?
A.	A plain ceiling
B.	Thermal insulation
C.	Acoustic insulation
D.	All the above
Answer» E.

Discussion

144.	The design of a retaining wall assumes that the retained earth$?
A.	Is dry
B.	Is free from moisture
C.	Is not cohesive
D.	All the above
Answer» E.

Discussion

145.	If P kg/m¬¨‚â§ is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by$?
A.	D = 0.00775 aP
B.	D = 0.0775 aP
C.	D = 0.07775 aP
D.	D = 0.775 Pa
Answer» B. D = 0.0775 aP

Discussion

146.	If the bearing capacity of soil is 10 tonnes/cm¬¨‚â§ and the projection of plain concrete footing from walls, is a cm, the depth D of footing is$?
A.	D = 0.0775 a
B.	D = 0.775 a
C.	D = 0.775 ‚Äö√ √∂a
D.	D = 0.775 a¬¨‚â§
Answer» C. D = 0.775 ‚Äö√ √∂a

Discussion

147.	If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is$?
A.	h = (W/Aw) [(1 - sin ≈ì√ú)/(1 + sin ≈ì√ú)]
B.	h = (W/Aw) [(1 + sin ≈ì√ú)/(1 + sin ≈ì√ú)]
C.	h = (W/Aw) [(1 - sin ≈ì√ú)/(1 + sin ≈ì√ú)]¬¨‚â§
D.	h = ‚Äö√ √∂(W/Aw) [(1 - sin ≈ì√ú)/(1 + sin ≈ì√ú)]¬¨‚â§
Answer» D. h = ‚Äö√ √∂(W/Aw) [(1 - sin ≈ì√ú)/(1 + sin ≈ì√ú)]¬¨‚â§

Discussion

148.	Minimum spacing between horizontal parallel reinforcement of the same size should not be less than$?
A.	One diameter
B.	2.5 diameters
C.	3 diameters
D.	3.5 diameters
Answer» B. 2.5 diameters

Discussion

149.	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$?
A.	WL/P
B.	WL/2P
C.	WL/3P
D.	WL/4P
Answer» E.

Discussion

150.	A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is$?
A.	WL/P
B.	WL/2P
C.	WL/3P
D.	WL/4P
Answer» D. WL/4P

Discussion

Explore topic-wise MCQs in Civil Engineering.

_ Steel beam theory is used for$?

_ The weight of a foundation is assumed as$?

_ For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed$?

_ An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encased with the floor of a hall 12 meters by 7 meters, is spaced at 3 meters from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is$?

_ Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than$?

_ A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm¬¨‚â§ steel. If the modular ratio (m) is 15, the depth of the neutral axis, is$?

_ According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is$?

_ A foundation is called shallow if its depth, is$?

_ An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is$?

_ After pre-stressing process is completed, a loss of stress is due to$?

_ The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon$?

_In a pre-stressed member it is advisable to use$?

_A short column 20 cm ‚àö√≥ 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/cm¬¨‚â§ and 300 kg/cm¬¨‚â§, the Safe load on the column, should not exceed$?

_An under-reinforced section means$?

_Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension$?

_The angle of internal friction of soil mass is the angle whose$?

_The minimum number of main steel bars provided in R.C.C.$?

_If ‚Äö√Ñ√≤A‚Äö√Ñ√¥ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‚Äö√Ñ√≤P‚Äö√Ñ√¥ through its centroidal longitudinal axis, the compressive stress in concrete, is$?

_Dimensions of a beam need be changed if the shear stress is more than$?

_If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment$?

_For stairs spanning horizontally, the minimum waist provided is$?

_A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm¬¨‚â§, the area of steel required, is$?

_For a number of columns constructed in a rcjw, the type of foundation provided, is$?

_The maximum ratio of span to depth of a cantilever slab, is$?

_The design of heel slab of a retaining wall is based on the maximum bending moment due to:$?

_In a singly reinforced beam, the effective depth is measured from its compression edge to$?

_The width of the flange of a T-beam should be less than$?

_Pick up the assumption for the design of a pre-stressed concrete member from the following:$?

_A pile of length ‚Äö√Ñ√≤L‚Äö√Ñ√¥ carrying a uniformly distributed load ‚Äö√Ñ√≤W‚Äö√Ñ√¥ per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is$?

_If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)$?

_The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is$?

_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$?

_In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength$?

_If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is$?

_The length of lap in tension reinforcement should not be less than the bar diameter ‚àö√≥ (actual tension / four times the permissible average bond stress) if it is more than$?

_The pitch of the main bars in a simply supported slab, should not exceed its effective depth by$?

_If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by$?

_High strength concrete is used in pre-stressed member$?

_The amount of reinforcement for main bars in a slab, is based upon$?

_[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by$?

_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$?

_If ‚Äö√Ñ√≤H‚Äö√Ñ√¥ is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is$?

_A ribbed slab is provided for$?

The design of a retaining wall assumes that the retained earth$?

If P kg/m¬¨‚â§ is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by$?

If the bearing capacity of soil is 10 tonnes/cm¬¨‚â§ and the projection of plain concrete footing from walls, is a cm, the depth D of footing is$?

If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is$?

Minimum spacing between horizontal parallel reinforcement of the same size should not be less than$?

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$?

A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is$?