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RCC Structures Quiz | RCC Structures Design Multiple Choice Questions with Answers

Questions
61 If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is
A (L/2) (1 – 3/qmax)
B (L/3) (1 – 5/qmax)
C (L/2) (1 – 5/qmax)
D (L/2) (1 – 2/q )

Answer: (L/2) (1 – 5/qmax)
62 If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept
A 4.5 m
B 4.0 m
C 3.5 m
D 3.0 m

Answer: 4.5 m
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63 The thickness of the topping of a ribbed slab, varies between
A 3 cm to 5 cm
B 5 cm to 8 cm
C 8 cm to 10 cm
D 12 cm to 15 cm

Answer: 5 cm to 8 cm
64 The zone in which transverse bending is likely to occur may be obtained by drawing a line from the
A 30°
B 45°
C 60°
D None of these

Answer: 45°
65 An R.C.C. column is treated as short column if its slenderness ratio is less than
A 30
B 35
C 40
D 50

Answer: 50
66 The advantage of reinforced concrete, is due to
A Monolithic character
B Fire-resisting and durability
C Economy because of less maintenance cost
D All the above

Answer: All the above
67 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: All the above
68 Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
A 42 diameters from the centre of the column
B 42 diameters from the inner edge of the column
C 42 diameters from the outer edge of the column
D 24 diameters from the centre of the column

Answer: 42 diameters from the outer edge of the column
69 The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
A 1400 kg/cm2
B 190 kg/cm2
C 260 kg/cm2
D 230 kg/cm2

Answer: 1400 kg/cm2
70 As per IS : 456, the reinforcement in a column should not be less than
A 0.5% and not more than 5% of cross-sectional area
B 0.6% and not more than 6% of cross-sectional area
C 0.7% and not more than 7% of cross-sectional area
D 0.8% and not more than 8% of cross-sectional area

Answer: 0.8% and not more than 8% of cross-sectional area
71 Spacing of stirrups in a rectangular beam, is
A Kept constant throughout the length
B Decreased towards the centre of the beam
C Increased at the ends
D Increased at the centre of the beam

Answer: Increased at the centre of the beam
72 Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
A Rankine formula
B Marcus formula
C Rankine Grashoff formula
D Grashoff formula

Answer: Rankine Grashoff formula
73 The Young’s modulus of elasticity of steel, is
A 150 KN/mm2
B 200 KN/mm2
C 250 KN/mm2
D 275 KN/mm2

Answer: 275 KN/mm2
74 If the tendon is placed at an rectangular beam (sectional top edge
A Is increased by PZ/e
B Is increased by Pe/Z
C Is decreased by Pe/Z
D Remains unchanged

Answer: Is decreased by Pe/Z
75 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: h/3
76 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 is the distance of centre of gravity of column loads) .
A y = L – (l – )
B y = L/2 + (l –)
C y = L/2 – (l + )
D y = L/2 – (l – )

Answer: y = L/2 – (l – )
77 For initial estimate for a beam design, the width is assumed
A 1/15th of span
B 1/20th of span
C 1/25th of span
D 1/30th of span

Answer: 1/30th of span
78 If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth D. of the footing from punching shear consideration, is
A D = W (a – b)/4a²bq
B D = W (a² – b²)/4a²bq
C D = W (a² – b²)/8a²bq
D D = W (a² – b²)/4abq

Answer: D = W (a² – b²)/4a²bq
79 The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is
A 25
B 30
C 35
D 40

Answer: 35
80 If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is
A w (R + T)/T
B w (R² + T²)/T
C w (R + T)/T
D w (R/T)

Answer: w (R² + T²)/T

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