16. 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

1. 1. P-1, Q-3, R-4, S-2

   
   
   

   2. P-3, Q-1, R-4, S-2

   
   
   

   3. P-4, Q-1, R-3, S-2

   
   
   

   4. P-3, Q-4, R-2, S-1

   
   
   

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1. View Hint View Answer Discuss in Forum

   Resistance to impact – Toughness
   Resistance to wear – Hardness
   Resistance to weathering action – Soundness
   Resistance to crushing – Strength

   Correct Option: B

   Resistance to impact – Toughness
   Resistance to wear – Hardness
   Resistance to weathering action – Soundness
   Resistance to crushing – Strength

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17. 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?

1. 1. Both (i) and (ii) are True

   
   
   

   2. Both (i) and (ii) are False

   
   
   

   3. (i) is True and (ii) is False

   
   
   

   4. (i) is False and (ii) is True

   
   
   

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1. View Hint View Answer Discuss in Forum

   Both statements are true

   Correct Option: A

   Both statements are true

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18. 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?

1. 1. Both (i) and (ii) are True

   
   
   

   2. Both (i) and (ii) are False

   
   
   

   3. (i) is True and (ii) is False

   
   
   

   4. (i) is False and (ii) is True

   
   
   

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1. View Hint View Answer Discuss in Forum

   As slump increases, Vebe time increases.

   Correct Option: D

   As slump increases, Vebe time increases.

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19. Consider the singly reinforced beam shown in the figure below:
    
    At cross-section XX, which of the following statements is TRUE at the limit state?

1. 1. The variation of stress is linear and that of strain is non-linear

   
   
   

   2. The variation of strain is linear and that of stress is non-linear

   
   
   

   3. The variations of both stress and strain is linear

   
   
   

   4. The variation of both stress and strain is non-linear

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: B

   

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20. The modulus of elasticity, E = 5000 √f_ck where f_ck is the characteristic compressive strength of concrete, specified in IS: 456-2000 is based on

1. 1. tangent modulus

   
   
   

   2. initial tangent modules

   
   
   

   3. secant modulus

   
   
   

   4. chord modulus

   
   
   

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1. View Hint View Answer Discuss in Forum

   initial tangent modules

   Correct Option: B

   initial tangent modules

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