Important Questions About Concrete -3

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49. Workability of concrete is measured by:

    1. Vicat’s apparatus test
    2. Slump test
    3. Minimum void method
    4. Talbot Richard test

Slump test

50. Shrinkage in concrete can be reduced by using:

    1. Low water cement ratio
    2. Less cement in the concrete
    3. Proper concrete mix
    4. Pre-saturated aggregates
    5. All of the above

All of the above

51. A construction joint is provided where;

    1. Bending moment is small
    2. Shear force is small
    3. The member is supported by other member
    4. All of the above

All of the above

52. Pick up the correct statement from the following:

    1. According to the petrological characteristics, concrete aggregates classified as heavy weight, normal weight & light weight
    2. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular & flaky
    3. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed & porous
    4. All the above

All the above 

53. Pick up the incorrect statement of the following:

    1. The degree of grinding of cement is called fineness
    2. The process of changing cement paste into hard mass, is known as setting of cement
    3. The phenomenon by virtue of which cement does not allow transmission of sound is known as soundness of cement
    4. The heat generated during chemical reaction of cement with water is known as heat of hydration
    5. None of these

The phenomenon by virtue of which cement does not allow transmission of sound is known as soundness of cement 

54. Permissible compressive strength of M150 concrete grade is

    1. 100 Kg/cm2
    2. 150 Kg/cm2
    3. 200 Kg/cm2
    4. 250 Kg/cm2
    5. 300 Kg/cm2

150 Kg/cm2  

55. Slump test of concrete is a measure of its:

    1. Consistency
    2. Compressive strength
    3. Tensile strength
    4. Impact value

 Consistency

56. Water cement ratio is :

    1. Volume of water to that of cement
    2. Weight of water to that of cement
    3. Weight of concrete to that of water
    4. Volume of concrete to that of water
    5. Both (a) & (b) are right

Both (a) & (b) are right 

57. Separation of water or water sand cement from a freshly concrete, is known as:

    1. Bleeding
    2. Creeping
    3. Segregation
    4. Flooding
    5. None of these

Bleeding 

58. According to water cement ratio law, the strength of workable plastic concrete:

    1. Depends upon the amount of water used in the mix
    2. Does not depends upon the quality of cement mixed with aggregates
    3. Does not depends upon the quantity of cement mixed with aggregates
    4. All the above

All the above 

59. High temperature:

    1. Increases the strength of concrete
    2. Decreases the strength of concrete
    3. Has no effect on the strength of concrete
    4. None of these

Decreases the strength of concrete 

60. Allowable shear strength of concrete depends on:

  1. Shear strength
  2. Tensile strength
  3. Compressive strength
  4. None of these

Shear strength 

61. Workability of concrete mix with low water cement ratio is determined by:

    1. Tensile strength test
    2. Slump test
    3. Compaction factor test
    4. Flexural strength test
    5. None of these

Compaction factor test 

62. While designing an air entrained concrete:

    1. Water cement ratio is reduced
    2. Proportion of aggregates is reduced
    3. An allowance for the entrained air is made
    4. Strength of the concrete is reduced
    5. All of the above

All of the above

63. Concrete gains strength due to :

    1. Chemical reaction of cement with sand & coarse aggregates
    2. Evaporation of water from concrete
    3. Hydration of cement
    4. All of the above

Hydration of cement 

64. What is hydration in concrete?

        1. It is the reaction between cement and water
        2. It is the reaction between cement and sand
        3. It is the reaction between cement and aggregated
        4. None of the above

It is the reaction between cement and water 

65. Main cause to reduce concrete durability?

    1. Corrosion of reinforcement
    2. Sulpate and ground water
    3. Fire
    4. All of the above

All of the above 

66. Plastic behavior of concrete:

    1. Shrinkage cracks
    2. Settlement
    3. A & B
    4. None of the above

A & B 

67. High W/C ratio leads to:

    1. Reduce strength
    2. Better workability
    3. Increase strength
    4. None of the above

Reduce strength

68. Air – entrained admixture used in concrete to:

    1. Increase workability
    2. Increase durability
    3. Eliminates segregation
    4. Reduce density of concrete

Increase durability 

69. What is the minimum thickness in blinding concrete in sub-structure concrete?

    1. 100 mm
    2. 50 mm
    3. 75 mm
    4. 125 mm

75 mm 

70. Function of aggregates in concrete:

    1. Economy
    2. Strength
    3. Reduction in shrinkage & expansion
    4. All of the above

All of the above

71. Toughness & abrasion resistance

    1. The ability of aggregates to resist damaging effect of loads is related to the hardness of aggregates
    2. LOS Angeles abrasion test evaluates the aggregates toughness & abrasion resistance
    3. All of the above

 All of the above

72. Why we make curing?

    1. To keep concrete moist
    2. To control the temperature of concrete
    3. All of the above

 

All of the above

73. Production of concrete:

  1. Batching of ingredients
  2. Mixing
  3. Fresh concrete
  4. Placing & curing
  5. Hardened concrete
  6. All of the above

All of the above

74. Methods to reduce bleeding:

    1. Use air entrainment
    2. Increase the proportion of sand and / or cement in concrete mix
    3. Use mineral admixtures such as fly ash or ground blast furnace slag 
    4. All of the above

All of the above

  1. Method to reduce segregation:
    1. Don’t use a mix that is too dry
    2. Use well graded aggregates
    3. Use proper placement & compaction techniques
    4. All of the above

All of the above


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