McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 51. |
High strength concrete is used in pre-stressed member |
| A. | To overcome high bearing stresses developed at theends |
| B. | To overcome bursting stresses at the ends |
| C. | To provide high bond stresses |
| D. | All the above |
| Answer» D. All the above | |
| 52. |
If is the load on a circular slab of radius , the maximum radial moment at the centre of the slab, is |
| A. | WR²/16 |
| B. | 2WR²/16 |
| C. | 3WR²/16 |
| D. | 5WR²/16 |
| Answer» C. 3WR²/16 | |
| 53. |
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 - )/(1 + sin )] |
| B. | h = (W/Aw) [(1 + )/(1 + sin )] |
| C. | h = (W/Aw) [(1 - )/(1 + sin )]² |
| D. | h W/Aw) [(1 - )/(1 + sin )]² |
| Answer» C. h = (W/Aw) [(1 - )/(1 + sin )]² | |
| 54. |
If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is |
| A. | 0.496% |
| B. | 0.596 % |
| C. | 0.696 % |
| D. | 0.796% |
| Answer» C. 0.696 % | |
| 55. |
The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation. |
| A. | m = 700/3C |
| B. | m = 1400/3C |
| C. | m = 2800/3C |
| D. | m = 3500/3C |
| Answer» C. m = 2800/3C | |
| 56. |
Enlarged head of a supporting column of a flat slab is technically known as |
| A. | Supporting end of the column |
| B. | Top of the column |
| C. | Capital |
| D. | Drop panel |
| Answer» C. Capital | |
| 57. |
Thickened part of a flat slab over its supporting column, is technically known as |
| A. | Drop panel |
| B. | Capital |
| C. | Column head |
| D. | None of these |
| Answer» A. Drop panel | |
| 58. |
If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is |
| A. | P/A |
| B. | A/P |
| C. | P/2A |
| D. | 2A/P |
| Answer» A. P/A | |
| 59. |
Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds |
| A. | 50 cm |
| B. | 75 cm |
| C. | 100 cm |
| D. | 120 cm |
| Answer» B. 75 cm | |
| 60. |
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 his |
| A. | WL/P |
| B. | WL/2P |
| C. | WL/3P |
| D. | WL/4P |
| Answer» C. WL/3P | |
| 61. |
The minimum head room over a stair must be |
| A. | 200 cm |
| B. | 205 cm |
| C. | 210 cm |
| D. | 230 cm |
| Answer» C. 210 cm | |
| 62. |
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» B. D = W (a² -b²)/4a²bq | |
| 63. |
For initial estimate for a beam design, the width is assumed |
| A. | 1/15th ofspan |
| B. | 1/20th ofspan |
| C. | 1/25th ofspan |
| D. | 1/30th ofspan |
| Answer» D. 1/30th ofspan | |
| 64. |
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» D. y = L/2 - (l - ) | |
| 65. |
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» B. h/3 | |
| 66. |
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge |
| A. | Is increased byPZ/e |
| B. | Is increased byPe/Z |
| C. | Is decreased by Pe/Z |
| D. | Remainsunchanged |
| Answer» C. Is decreased by Pe/Z | |
| 67. |
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» D. 275 KN/mm2 | |
| 68. |
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. | Grashoffformula |
| Answer» C. Rankine Grashoff formula | |
| 69. |
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» D. Increased at the centre of the beam | |
| 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» D. 0.8% and not more than 8% of cross-sectional area | |
| 71. |
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» A. 1400 kg/cm2 | |
| 72. |
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 diametersfrom the inner edge of the column |
| C. | 42 diametersfrom the outer edge ofthe column |
| D. | 24 diametersfrom the centre of the column |
| Answer» C. 42 diametersfrom the outer edge ofthe column | |
| 73. |
Pick up the assumption for the design of a pre-stressed concrete member from the following: |
| A. | A transverse plane section remains a plane afterbending |
| B. | During deformation limits, Hook'slaw is equally applicable to concrete as well asto steel |
| C. | Variation of stress in reinforcement due to changes in external loading is negligible |
| D. | All the above |
| Answer» D. All the above | |
| 74. |
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» D. All the above | |
| 75. |
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» D. 50 | |
| 76. |
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» B. 45° | |
| 77. |
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» B. 5 cm to 8 cm | |
| 78. |
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» A. 4.5 m | |
| 79. |
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/qmax) |
| Answer» C. (L/2) (1 - 5/qmax) | |
| 80. |
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 theplane |
| B. | Sine is equal to the ratio ofthe 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 themaximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane |
| D. | None of these |
| Answer» A. Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on theplane | |
| 81. |
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» C. 35 | |
| 82. |
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» B. w (R² + T²)/T | |
| 83. |
If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be. |
| A. | Straight below centroidal axis |
| B. | Parabolic with convexity downward |
| C. | Parabolic with convexity upward |
| D. | Straight above centroidal axis |
| Answer» B. Parabolic with convexity downward | |
| 84. |
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» C. 20 | |
| 85. |
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be |
| A. | 8hp/l |
| B. | 8hp/l² |
| C. | 8hl/p |
| D. | 8hl/p² |
| Answer» B. 8hp/l² | |
| 86. |
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 |
| A. | 200 cm |
| B. | 300 cm |
| C. | 150 cm |
| D. | 100 cm |
| Answer» C. 150 cm | |
| 87. |
The steel generally used in R.C.C. work, is |
| A. | Stainless |
| B. | Mild steel |
| C. | High carbon steel |
| D. | High tensionsteel |
| Answer» B. Mild steel | |
| 88. |
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 |
| A. | (5/6) (r/1 + r²) M |
| B. | (5/6) (r²/1 + r²)M |
| C. | (5/6) (r²/1 + r3)M |
| D. | (5/6) (r²/1 + r4) M |
| Answer» D. (5/6) (r²/1 + r4) M | |
| 89. |
A part of the slab may be considered as the flange of the T-beam if |
| A. | Flange has adequate reinforcement transverse tobeam |
| B. | It is built integrally with the beam |
| C. | It is effectively bonded together with the beam |
| D. | All the above |
| Answer» D. All the above | |
| 90. |
By over-reinforcing a beam, the moment of resistance can be increased not more than |
| A. | 10 % |
| B. | 15 % |
| C. | 20 % |
| D. | 25% |
| Answer» D. 25% | |
| 91. |
Total pressure on the vertical face of a retaining wall of height per unit run exerted by the retained earth weighing per unit volume, is |
| A. | wh [(1 - )/(1 + sin )] |
| B. | wh² [(1 - )/(1 + sin )] |
| C. | wh² [(1 - )/2(1 + sin )] |
| D. | wh²[(1 - )/3(1 + sin )] |
| Answer» C. wh² [(1 - )/2(1 + sin )] | |
| 92. |
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. | bn (fc/2) (d - n/3) |
| B. | Atft (d - n/3) |
| C. | ½ n1 (1 - n1/3) cbd² |
| D. | All the above |
| Answer» D. All the above | |
| 93. |
According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» C. 15 cm | |
| 94. |
If 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 w2acting on strips parallel to l2 and l1 is |
| A. | w1/w2 = l2/l1 |
| B. | w1/w2 = (l2/l1)² |
| C. | w1/w2 = (l2/l1)3 |
| D. | w1/w2 = (l2/l1)4 |
| Answer» D. w1/w2 = (l2/l1)4 | |
| 95. |
The live load to be considered for an accessible roof, is |
| A. | Nil |
| B. | 75 kg/m3 |
| C. | 150 kg/m2 |
| D. | 200 kg/cm2 |
| Answer» C. 150 kg/m2 | |
| 96. |
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 |
| A. | cAc + m cAsc |
| B. | c(A - Asc) + m cAsc |
| C. | c[A + (m - 1)ASC] |
| D. | All the above |
| Answer» D. All the above | |
| 97. |
On an absolutely rigid foundation base, the pressure will |
| A. | Be more at the edges of thefoundation |
| B. | Be uniform |
| C. | Not be uniform |
| D. | Be zero at the centre of the foundation |
| Answer» C. Not be uniform | |
| 98. |
The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than |
| A. | 4 mm |
| B. | 5 mm |
| C. | 6 mm |
| D. | 7 mm |
| Answer» D. 7 mm | |
| 99. |
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» B. wl²/8 | |
| 100. |
If P kg/m2 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» A. D = 0.00775 aP | |
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