McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam |
| A. | Is safe in shear |
| B. | Is safe with stirrups |
| C. | Is safe with stirrups and inclined bars |
| D. | Needs revision of section |
| Answer» B. Is safe with stirrups | |
| 2. |
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» C. Three-fourth of the width of the slab | |
| 3. |
The load stress of a section can be reduced by |
| A. | Decreasing the lever arm |
| B. | Increasing the total perimeter of bars |
| C. | Replacing larger bars by greater number of small bars |
| D. | Replacing smaller bars by greater number of greater bars |
| Answer» C. Replacing larger bars by greater number of small bars | |
| 4. |
The diameter of the column head support a flat slab, is generally kept |
| A. | 0.25 times the span length |
| B. | 0.25 times the diameter of the column |
| C. | 4.0 cm larger than the diameter of the column |
| D. | 5.0 cm larger than the diameter of the column |
| Answer» B. 0.25 times the diameter of the column | |
| 5. |
If ‘W’ is the uniformly distributed load on a circular slab of radius ‘R‘fixed at tsends, the maximum positive radial moment at its centre, is |
| A. | 3WR²/16 |
| B. | 2WR²/16 |
| C. | WR²/16 |
| D. | None of these |
| Answer» D. None of these | |
| 6. |
The maximum ratio of span to depth of a slab simply supported and |
| A. | 35 |
| B. | 25 |
| C. | 30 |
| D. | 20 |
| Answer» D. 20 | |
| 7. |
Pick up the correct statement from the following |
| A. | Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling |
| B. | Lateral reinforcement prevents the shearing of concrete on diagonal plane |
| C. | Lateral reinforcement stops breaking away of concrete cover, due to buckling |
| D. | All the above |
| Answer» D. All the above | |
| 8. |
In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as |
| A. | A key |
| B. | A cut-off wall |
| C. | A rib |
| D. | All the above |
| Answer» B. A cut-off wall | |
| 9. |
Lapped splices in tensile reinforcement are generally not used for bars of size larger than |
| A. | 18 mmdiameter |
| B. | 24 mmdiameter |
| C. | 30 mmdiameter |
| D. | 36 mmdiameter |
| Answer» D. 36 mmdiameter | |
| 10. |
Minimum spacing between horizontal parallel reinforcement of the same size should not be less than |
| A. | Onediameter |
| B. | 2.5 diameters |
| C. | 3 diameters |
| D. | 3.5 diameters |
| Answer» A. Onediameter | |
| 11. |
For a ribbed slab |
| A. | Clear spacing between ribs shall not be greater than 4.5 cm |
| B. | Width of the rib shall not be less than 7.5 cm |
| C. | Overall depth of the slab shall not exceed four times the breadth of the rib |
| D. | All the above |
| Answer» D. All the above | |
| 12. |
A very comfortable type of stairs is |
| A. | Straight |
| B. | Dog legged |
| C. | Geometrical |
| D. | Open newel |
| Answer» D. Open newel | |
| 13. |
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» C. Four times | |
| 14. |
The width of the flange of a L-beam, should be less than |
| A. | One-sixth of the effective span |
| B. | Breadth of therib + four times thickness of the slab |
| C. | Breadth of the rib + half clear distance betweenribs |
| D. | Least of theabove |
| Answer» D. Least of theabove | |
| 15. |
To ensure uniform pressure distribution, the thickness of the foundation, is |
| A. | Kept uniform throughout |
| B. | Increased gradually towards the edge |
| C. | Decreased gradually towards the edge |
| D. | Kept zero at theedge |
| Answer» C. Decreased gradually towards the edge | |
| 16. |
The maximum permissible size of aggregates to be used in casting the ribs of a slab, is |
| A. | 5 mm |
| B. | 7.5 mm |
| C. | 10 mm |
| D. | 15 mm |
| Answer» C. 10 mm | |
| 17. |
Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam |
| A. | Are curtailed if not required to resist the bendingmoment |
| B. | Are bent up at suitable places to serve as shearreinforcement |
| C. | Are bent down at suitable places to serve asshear reinforcement |
| D. | Are maintained at bottom to provide at least local bond stress |
| Answer» C. Are bent down at suitable places to serve asshear reinforcement | |
| 18. |
Steel bars are generally connected together to get greater length than the standard length by providing |
| A. | Straight bar splice |
| B. | Hooked splice |
| C. | Dowel splice |
| D. | All the above |
| Answer» D. All the above | |
| 19. |
Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of |
| A. | 0.1 L from the outer edge of column |
| B. | 0.1 L from the centre edge ofcolumn |
| C. | Half the distance of projection |
| D. | One-fourth the distance of projection |
| Answer» B. 0.1 L from the centre edge ofcolumn | |
| 20. |
For M 150 grade concrete (1:2:4) the moment of resistance factor is |
| A. | (A) 0.87 |
| B. | (B) 8.50 |
| C. | (C) 7.50 |
| D. | (D) 5.80 |
| Answer» B. (B) 8.50 | |
| 21. |
The minimum thickness of a flat slab is taken |
| A. | L/32 for end panels without drops |
| B. | L/36 for end panels without drops |
| C. | L/36 for interior panels without drop |
| D. | All the above |
| Answer» D. All the above | |
| 22. |
The neutral axis of a T-beam exists |
| A. | Within the flange |
| B. | At the bottom edge of the slab |
| C. | Below the slab |
| D. | All the above |
| Answer» D. All the above | |
| 23. |
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» D. All the above | |
| 24. |
A pre-cast pile generally used, is |
| A. | Circular |
| B. | Square |
| C. | Octagonal |
| D. | Square with corners chamfered |
| Answer» D. Square with corners chamfered | |
| 25. |
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» D. All the above | |
| 26. |
The self-weight of the footing, is |
| A. | Not considered for calculating the upward pressure on footing |
| B. | Also considered for calculating the upward pressure on footing |
| C. | Not considered for calculating the area of the footing |
| D. | Both (b) and (c) |
| Answer» A. Not considered for calculating the upward pressure on footing | |
| 27. |
Pick up the incorrect statement from the following: |
| A. | In the stem of a retaining wall, reinforcement is provided near the earth side |
| B. | In the toe slab of a retaining wall, reinforcement is provided at the bottom of the slab |
| C. | In the heel slab of a retaining wall, reinforcement is provided at the top of the slab |
| D. | None of these |
| Answer» D. None of these | |
| 28. |
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» D. All the above | |
| 29. |
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» D. Six times | |
| 30. |
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 | |
| 31. |
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 | |
| 32. |
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 | |
| 33. |
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 | |
| 34. |
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 | |
| 35. |
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» B. 200 KN/mm2 | |
| 36. |
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 | |
| 37. |
As per IS : 456, the reinforcement in a column should not be less than |
| A. | 0.5% and not more than 5% of cross |
| B. | 0.6% and not more than 6% of cross |
| C. | 0.7% and not more than 7% of cross |
| D. | 0.8% and not more than 8% of cross |
| Answer» D. 0.8% and not more than 8% of cross | |
| 38. |
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 | |
| 39. |
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» C. 42 diameters from the outer edge of the column | |
| 40. |
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 | |
| 41. |
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 | |
| 42. |
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 | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
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 | |
| 47. |
A part of the slab may be considered as the flange of the T-beam if |
| A. | Flange has adequate reinforcement transverse to beam |
| 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 | |
| 48. |
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 % | |
| 49. |
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 | |
| 50. |
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 | |
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