Concrete Technology Objective Questions with Answer Key - Set 09 - ObjectiveBooks

Concrete Technology Objective Questions with Answer Key - Set 09

Practice Test: Question Set - 09


1. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than
    (A) 15 mm
    (B) 25 mm
    (C) 30 mm
    (D) 40 mm

2. Workability of concrete is measured by
    (A) Vicat apparatus test
    (B) Slump test
    (C) Minimum void method
    (D) Talbot Richard test

3. The size of fine aggregates does not exceed
    (A) 2.75 mm
    (B) 3.00 mm
    (C) 3.75 mm
    (D) 4.75 mm

4. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone
    (A) Compressive stress
    (B) Shear stress
    (C) Bond stress
    (D) Tensile stress

5. Hardening of cement occurs at
    (A) Rapid rate during the first few days and afterwards it continues to increase at a decreased rate
    (B) Slow rate during the first few days and afterwards it continues to increase at a rapid rate
    (C) Uniform rate throughout its age
    (D) None of these

6. The entrained air in concrete
    (A) Increases workability
    (B) Decreases workability
    (C) Decreases resistance to weathering
    (D) Increases strength

7. According to IS: 4561978, the flexural strength of concrete is
    (A) Directly proportional to compressive strength
    (B) Inversely proportional to compressive strength
    (C) Directly proportional to square root of compressive strength
    (D) Inversely proportional to square root of compressive strength

8. Slump test is done for
    (A) Clay
    (B) Sand
    (C) Lime
    (D) Concrete

9. Di-calcium silicate (C2S)
    (A) Hydrates rapidly
    (B) Generates less heat of hydration
    (C) Hardens rapidly
    (D) Provides less ultimate strength to cement

10. The limits of percentage p of the longitudinal reinforcement in a column is given by
    (A) 0.15% to 2%
    (B) 0.8% to 4%
    (C) 0.8% to 6%
    (D) 0.8% to 8%

11. The risk of segregation is more for
    (A) Wetter mix
    (B) Larger proportion of maximum size aggregate
    (C) Coarser grading
    (D) All the above

12. Le-Chatelier's apparatus is used for testing
    (A) Soundness of cement
    (B) Hardness of cement
    (C) Strength of cement
    (D) Durability of cement

13. According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to (Where d is effective depth of beam).
    (A) 0.43 d
    (B) 0.537 d
    (C) 0.68 d
    (D) 0.85 d

14. Construction joints are generally provided in concrete
    (A) Roads
    (B) Retaining walls
    (C) Lining of canals
    (D) All the above

15. If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain
    (A) 20 mm particles
    (B) 10 mm particles
    (C) 4.75 mm particles
    (D) All the above

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