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MCQOPTIONS
This section includes 96 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Structures knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Read the following two statements I. Maximum strain in concrete at the outermost compression fibre is taken to be 0.0035 in bending. II. The maximum compressive strain in concrete in axial compression is taken as 0.002. Keeping the provisions of IS 456-2000 on limit state design in mind, which of the following is true? |
| A. | Statement I is true but II is false |
| B. | Statement I is false but II is true |
| C. | Both statements I and II are true |
| D. | Both statement I and II are false |
| Answer» D. Both statement I and II are false | |
| 2. |
The following two statements are made with reference to a simply supported under-reinforced RCC beam: I. Failure takes place by crushing of concrete before the steel has yielded. II. the neutal axis moves up as the load is increased. With reference to the above statements, which of the following applies? |
| A. | Both the statements are false. |
| B. | I is true but II is false. |
| C. | Both the statements are true. |
| D. | I is false but II is true. |
| Answer» E. | |
| 3. |
Consider the following statements: I. Modulus of elasticity of concrete increases with increase in compressive strength of concrete. II. Brittleness of concrete increases with decrease in compressive strength of concrete. III. Shear strength of concrete increases with increase in compressive strength of concrete. The TRUE statements are |
| A. | II and III |
| B. | I, II and III |
| C. | I and II |
| D. | I and III |
| Answer» C. I and II | |
| 4. |
Consider the following statements: I. The compressive strength of concrete decreases with increase in water-cement ratio of the concrete mix. II. Water is added to the concrete mix for hydration of cement and work ability. III. Creep and shrinkage of concrete are independent of the water-cement ratio in the concrete mix. The true statements are |
| A. | I and II |
| B. | I, II and III |
| C. | II and III |
| D. | Only II |
| Answer» C. II and III | |
| 5. |
The state of two dimensional stress acting on a concrete lamina consists of a direct tensile stress, x = 1.5 N/mm2, and shear stress = 1.20 N/mm2, which cause cracking of concrete. Then the tensile strength of the concrete in N/ mm2 is |
| A. | 1.5 |
| B. | 2.08 |
| C. | 2.17 |
| D. | 2.29 |
| Answer» D. 2.29 | |
| 6. |
A concrete column caries an axial laod of 450 kN and a bending moment of 60 kM m at its base. An isolated footing of size 2m by 3m, with 3m side along the plane of the bending moment, is provided under the column. Centres of gravity of column and footing coincide. The net maximum and the minimum pressures in kN/m2 on soil under the footing are respectively. |
| A. | 95 and 55 |
| B. | 95 and 75 |
| C. | 75 and 55 |
| D. | 75 and 75 |
| Answer» B. 95 and 75 | |
| 7. |
Consider the following statements for air-untrained concrete: (i) Air-entertainment reduces the water demand for a given level of work ability (ii) Use of air-untrained concrete is required in environments where cyclic freezing and thawing is expected Which of the following is TRUE? |
| A. | Both (i) and (ii) are True |
| B. | Both (i) and (ii) are False |
| C. | (i) is True and (ii) is False |
| D. | (i) is False and (ii) is True |
| Answer» B. Both (i) and (ii) are False | |
| 8. |
Work ability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for work ability of concrete: (i) As the slump increases, the Vebe time increases (ii) As the slump increases, the compaction factor increases Which of the following is TRUE? |
| A. | Both (i) and (ii) are True |
| B. | Both (i) and (ii) are False |
| C. | (i) is True and (ii) is False |
| D. | (i) is False and (ii) is True |
| Answer» E. | |
| 9. |
The modulus of elasticity, E = 5000 fck where fck is the characteristic compressive strength of concrete, specified in IS: 456-2000 is based on |
| A. | tangent modulus |
| B. | initial tangent modules |
| C. | secant modulus |
| D. | chord modulus |
| Answer» C. secant modulus | |
| 10. |
Top ring beam of an Intze tank carries a hoop tension of 120 kN. the beam cross-section is 250 mm wide the 400 mm deep and it is reinforced with 4 bars of 20 mm diameter of Fe 415 grade. Modular ratio of the concrete is 10. The tensile stress in N/ mm2 in the concrete is |
| A. | 1.02 |
| B. | 1.07 |
| C. | 1.20 |
| D. | 1.32 |
| Answer» C. 1.20 | |
| 11. |
Maximum strain in an extreme fibre in concrete and in the tension reinforcement (Fe-415 grade and Es = 200 kN/mm2) in a balanced section at limit state of flexure are respectively |
| A. | 0.0035 and 0.0038 |
| B. | 0.002 and 0.0018 |
| C. | 0.0035 and 0.0041 |
| D. | 0.002 and 0.0031 |
| Answer» B. 0.002 and 0.0018 | |
| 12. |
As per the provisions of IS 456-2000, the (short-term) modulus of elasticity of M 25 grade concrete (in N/mm2) can be assumed to be |
| A. | 25000 |
| B. | 28500 |
| C. | 30000 |
| D. | 36000 |
| Answer» B. 28500 | |
| 13. |
Match the information related to tests on aggregates given in Group-I with that in Group-II Group-I P. Resistance to impact Q. Resistance to wear R. Resistance to weathering action S. Resistance to crushing Group-II 1. Hardness 2. Strength 3. Toughness 4. Soundness |
| A. | P-1, Q-3, R-4, S-2 |
| B. | P-3, Q-1, R-4, S-2 |
| C. | P-4, Q-1, R-3, S-2 |
| D. | P-3, Q-4, R-2, S-1 |
| Answer» C. P-4, Q-1, R-3, S-2 | |
| 14. |
The following statements are related to temperature stresses developed in concrete pavement slabs with free edges (without any restraint):P. The temperature stresses will be zero during both day and night times if the pavement slab is considered weightless Q. The temperature stresses will be compressive at the bottom of the slab during night time if the self-weight of the pavement slab is considered R. The temperature stresses will be compressive at the bottom of the slab during day time if the self-weight of the pavement slab is considered The TRUE statement(s) is (are) |
| A. | P only |
| B. | Q only |
| C. | P and Q only |
| D. | P and R only |
| Answer» D. P and R only | |
| 15. |
The percentage loss of prestress due to anchorage slip of 3 mm in a concrete beam of length 30 m which is post-tensioned by a tendon with an initial stress of 1200 N/mm2 and modulus of elasticity equal to 2.1 105 N/mm2 is |
| A. | 0.0175 |
| B. | 0.175 |
| C. | 1.75 |
| D. | 17.5 |
| Answer» D. 17.5 | |
| 16. |
The modulus of rupture of concrete in terms of its characteristics cube compressive strength (fck) in MPa according to IS 456: 2000 is |
| A. | 5000 f |
| B. | 0.7 f |
| C. | 5000 |
| D. | 0.7 |
| Answer» E. | |
| 17. |
A pre-tensioned concrete member of section 200 mm 250 mm contains tendons of area 500 mm2 at the centre of gravity of the section. The pre-stress in tendons is 1000 N/mm2. Assuming modular ratio as 10, the stress (N/mm2) in concrete is |
| A. | 11 |
| B. | 9 |
| C. | 7 |
| D. | 5 |
| Answer» C. 7 | |
| 18. |
A reinforced concrete column contains longitudinal steel equal to 1 per cent of net cross-sectional area of the column. Assume modular ration as 10. The loads carried (using the elastic theory) by the longitudinal steel and the net area of concrete, are Ps and Pc respectively. The ration Ps/ Pc expressed as per cent is |
| A. | 0.1 |
| B. | 1 |
| C. | 1.1 |
| D. | 10 |
| Answer» E. | |
| 19. |
The equivalent flexural moment (Mcl) for designing the longitudinal tension steel is |
| A. | 187 kN-m |
| B. | 200 kN-m |
| C. | 29 kN-m |
| D. | 213 kN-m |
| Answer» C. 29 kN-m | |
| 20. |
The equivalent shear force (Ve) is |
| A. | 20 kN |
| B. | 54 kN |
| C. | 56 kN |
| D. | 68 kN |
| Answer» E. | |
| 21. |
In a reinforced concrete section, the stress at the extreme fibre in compression is 5.80 MPa. The depth of neutral axis in the section is 58 mm and the grade of concrete is M25.Assuming linear elastic behaviour of the concrete, the effective curvature of the section (in per mm) is |
| A. | 2.0 10 |
| B. | 3.0 10 |
| C. | 4.0 10 |
| D. | 5.0 10 |
| E. | |
| Answer» D. 5.0 10 | |
| 22. |
The value of xu (in mm) computed as per the Limit State Method of IS 456: 2000 is |
| A. | 200.0 |
| B. | 223.3 |
| C. | 236.3 |
| D. | 273.6 |
| Answer» D. 273.6 | |
| 23. |
The limiting area of tension steel in mm2 is |
| A. | 473.9 |
| B. | 412.3 |
| C. | 373.9 |
| D. | 312.3 |
| Answer» B. 412.3 | |
| 24. |
The flexural tensile strength of M25 grade of concrete, in N/mm2, as per IS: 456-2000 is _______ |
| A. | 0.24 |
| B. | 0.214 |
| C. | 0.35 |
| D. | 5 |
| Answer» D. 5 | |
| 25. |
While designing, for a steel column of Fe250 grade, a base plate resting on a concrete pedestal of M20 grade, the bearing strength of concrete (in N/mm2) in limit state method of design as per IS:456-2000 is _____________. |
| A. | 9 |
| B. | 8 |
| C. | 2 |
| D. | 12 |
| Answer» B. 8 | |
| 26. |
As per IS 456:2000 for M20 grade concrete and plain barsin tension the design bond stress bd = 1.2 MPa. Further, IS 456:2000 permits this design bond stress value to be increased by 60% for HSD bars. The stress in the HSD reinforcing steel barsin tension, s 360 MPa. Find the required development length, Ld, for HSD bars in terms of the bar diameter, |
| A. | 46.875 |
| B. | 56.875 |
| C. | 46.975 |
| D. | 46.85 |
| Answer» B. 56.875 | |
| 27. |
A rectangular beam of width (b) 230 mm and effective depth (d) 450 mm is reinforced with four bars of 12 mm diameter. The grade of concrete is M20 and grade of steel is Fe500. Given that for M20 grade of concrete the ultimate shear strength, uc = 0.36 N/mm2 for steel percentage, p = 0.25, and uc = 0.48 N/mm2 for p = 0.50. For a factored shear force of 45 kN, the diameter (in mm) of Fe500 steel two lagged stirrups to be used at spacing of 375 mm, should be |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 16 |
| Answer» B. 10 | |
| 28. |
A rectangular concrete beam of width 120 mm and depth 200 mm is pre-stressed by pre-tensioning to a force of 150 kN at an eccentricity of 20 mm. The cross sectional area of the prestressing steel is 187.5 mm2. Take modulus of elasticity of steel and concrete as 2.1 105 MPa and 3.0 104 MPa respectively. The percentage loss of stress in the prestressing steel due to elastic deformation of concrete is |
| A. | 8.75 |
| B. | 6.125 |
| C. | 4.81 |
| D. | 2.19 |
| Answer» C. 4.81 | |
| 29. |
Consider two RCC beams, P and Q, each having the section 400 mm 750 mm (effective depth, d = 750 mm) made with concrete having a &taucmax = 2.1 N/mm2. For the reinforcement provided and the grade of concrete used, it may be assumed that the &tauc = 0.75 N/mm2. The design shear in beam P is 400 kN and in beam Q is 750 kN. Considering the provisions of IS 456: 2000, which of the following statements is TRUE? |
| A. | Shear reinforcement should be designed for 175 kN for beam P and the section for beam Q should be revised. |
| B. | Nominal shear reinforcement is required for beam P and the shear reinforcement should be designed for 120 kN for beam Q. |
| C. | Shear reinforcement should be designed for 175 kN for beam P and the shear reinforcement should be designed for 525 kN for beam Q. |
| D. | The sections for both beams P and Q need to be revised. |
| Answer» B. Nominal shear reinforcement is required for beam P and the shear reinforcement should be designed for 120 kN for beam Q. | |
| 30. |
The working stress method of design specifies the value of modular raito, m = 280/(3 cbc), where cbc is the allowable stress in bending compression in concrete. To whajt extent does the above value of m make any allowance for the creep of concrete? |
| A. | No compensation |
| B. | Full compensation |
| C. | Partial comprssion |
| D. | The two are unrelated |
| Answer» D. The two are unrelated | |
| 31. |
Column I gives a list of test methods for evaluating properties of concrete and Column II gives the list of properties: Column IColumn II P. Resonant frequency1. Tensile strength test Q. Rebound hammer test2. Dynamic modulus of elasticity R. Split cylinder test3. Work ability S. Compacting factor test4. Compressive strengthThe correct match of the test with the property is |
| A. | P-2, Q-4, R-1, S-3 |
| B. | P-2, Q-1, R-4, S-3 |
| C. | P-2, Q-4, R-3, S-1 |
| D. | P-4, Q-3, R-1, S-2 |
| Answer» B. P-2, Q-1, R-4, S-3 | |
| 32. |
The composition of an air-entrained concrete is given below: Water: 184 kg/m2 Ordinary Portland Cement(OPC): 368 kg/m3 Sand: 606 kg/m3 Coarse aggregate: 1155 kg/m3 Assume the specific gravity of OPC, sand and coarse aggregate to be 3.14, 2.67 and 2.74, respectively. The air content is ______ litres/m3. |
| A. | 51 |
| B. | 52 |
| C. | 24 |
| D. | 15 |
| Answer» B. 52 | |
| 33. |
The development length of a deformed reinforcement bar can be expressed as (1/k) ( s/ bd). From the IS:456-2000, the value of k can be calculated as _________. |
| A. | 6.4 |
| B. | 6.9 |
| C. | 6.7 |
| D. | 6.8 |
| Answer» B. 6.9 | |
| 34. |
As per India standard code of practice for pre-stressed concrete (IS: 1343-1980) the minimum grades of concrete to be used for post-pensioned and pre-pensioned structural elements are respectively |
| A. | M20 for both |
| B. | M40 and M30 |
| C. | M15 and M20 |
| D. | M30 and M40 |
| Answer» E. | |
| 35. |
Consider a reinforcing bar embedded in concrete. In a marine environment this bar undergoes uniform corrosion, which leads to the deposition of corrosion products on its surface and an increase in the apparent volume of the bar. This subjects the surrounding concrete to expansive pressure. As a result, corrosion induced cracks appear at the surface of concrete. Which of the following statements is TRUE? |
| A. | Corrosion causes circumferential tensile stresses in concrete and the cracks will be parallel to the corroded reinforcing bar. |
| B. | Corrosion causes radial tensile stresses in concrete and the cracks will be parallel to the corroded reinforcing bar. |
| C. | Corrosion causes circumferential tensile stresses in concrete and the cracks will be perpendicular to the direction of the corroded reinforcing bar. |
| D. | Corrosion causes radial tensile stresses in concrete and the cracks will be perpendicular to the direction of the corroded reinforcing bar. |
| Answer» D. Corrosion causes radial tensile stresses in concrete and the cracks will be perpendicular to the direction of the corroded reinforcing bar. | |
| 36. |
Column I gives a list of test methods for evaluating properties of concrete and Column II gives the list of properties: |
| A. | P-2, Q-4, R-1, S-3 |
| B. | P-2, Q-1, R-4, S-3 |
| C. | P-2, Q-4, R-3, S-1 |
| D. | P-4, Q-3, R-1, S-2 |
| Answer» B. P-2, Q-1, R-4, S-3 | |
| 37. |
In the theory of plastic bending of beams, the ratio of plastic moment to yield moment is called |
| A. | shape factor |
| B. | plastic section modulus |
| C. | modulus of resilience |
| D. | rigidity modulus |
| Answer» D. rigidity modulus | |
| 38. |
The following statements are related to temperature stresses developed in concrete pavement slabs with free edges (without any restraint): |
| A. | P only |
| B. | Q only |
| C. | P and Q only |
| D. | P and R only |
| Answer» D. P and R only | |
| 39. |
Consider two RCC beams, P and Q, each having the section 400 mm 750 mm (effective depth, d = 750 mm) made with concrete having a &tau |
| A. | Shear reinforcement should be designed for 175 kN for beam P and the section for beam Q should be revised. |
| B. | Nominal shear reinforcement is required for beam P and the shear reinforcement should be designed for 120 kN for beam Q. |
| C. | Shear reinforcement should be designed for 175 kN for beam P and the shear reinforcement should be designed for 525 kN for beam Q. |
| D. | The sections for both beams P and Q need to be revised. |
| Answer» B. Nominal shear reinforcement is required for beam P and the shear reinforcement should be designed for 120 kN for beam Q. | |
| 40. |
Which one of the following is categorised as a long-term loss of pre-stress in a pre-stressed concrete member? |
| A. | Loss due to elastic shortening |
| B. | Loss due to friction |
| C. | Loss due to relaxation of strands |
| D. | Loss due to anchorage slip |
| Answer» D. Loss due to anchorage slip | |
| 41. |
In the design of a reinforced concrete beam the requirement for bond is not getting satisfied. The economical option to satisfy the requirement for bond is by |
| A. | bundling of bars |
| B. | providing smaller diameter bars more in number |
| C. | providing larger diameter bars less in number |
| D. | providing same diameter bars more in number |
| Answer» C. providing larger diameter bars less in number | |
| 42. |
Select the strength parameter of concrete used in design of plain jointed cement concrete pavements from the following choices. |
| A. | Tensile strength |
| B. | Compressive strength |
| C. | Flexural strength |
| D. | Shear strength |
| Answer» D. Shear strength | |
| 43. |
The partial factor of safety for concrete as IS: 456-2000 is |
| A. | 1.50 |
| B. | 1.15 |
| C. | 0.87 |
| D. | 0.446 |
| Answer» B. 1.15 | |
| 44. |
IS: 1343 - 1980 limits the minimum characteristics strength of prestressed concrete for post tensioned works and pretension work as |
| A. | 25 MPa, 30 MPa respectively |
| B. | 25 MPa, 35 MPa respectively |
| C. | 30 MPa, 35 MPa respectively |
| D. | 30 MPa, 40 MPa respectively |
| Answer» E. | |
| 45. |
The equivalent shear force (V |
| A. | 20 kN |
| B. | 54 kN |
| C. | 56 kN |
| D. | 68 kN |
| Answer» E. | |
| 46. |
Top ring beam of an Intze tank carries a hoop tension of 120 kN. the beam cross-section is 250 mm wide the 400 mm deep and it is reinforced with 4 bars of 20 mm diameter of Fe 415 grade. Modular ratio of the concrete is 10. The tensile stress in N/ mm |
| A. | 1.02 |
| B. | 1.07 |
| C. | 1.20 |
| D. | 1.32 |
| Answer» C. 1.20 | |
| 47. |
Maximum strain in an extreme fibre in concrete and in the tension reinforcement (Fe-415 grade and E |
| A. | 0.0035 and 0.0038 |
| B. | 0.002 and 0.0018 |
| C. | 0.0035 and 0.0041 |
| D. | 0.002 and 0.0031 |
| Answer» B. 0.002 and 0.0018 | |
| 48. |
As per provisions of IS 456-2000, in the limit state method for design of beams, the limiting value of the depth of neutral axis in a reinforced concrete beam of effective depth d is given as |
| A. | 0.53 d |
| B. | 0.48 d |
| C. | 0.46 d |
| D. | any of the above depending on the different grades of steel. |
| Answer» E. | |
| 49. |
A concrete column caries an axial laod of 450 kN and a bending moment of 60 kM m at its base. An isolated footing of size 2m by 3m, with 3m side along the plane of the bending moment, is provided under the column. Centres of gravity of column and footing coincide. The net maximum and the minimum pressures in kN/m |
| A. | 95 and 55 |
| B. | 95 and 75 |
| C. | 75 and 55 |
| D. | 75 and 75 |
| Answer» B. 95 and 75 | |
| 50. |
The equivalent flexural moment (M |
| A. | 187 kN-m |
| B. | 200 kN-m |
| C. | 29 kN-m |
| D. | 213 kN-m |
| Answer» C. 29 kN-m | |