Design of Concrete Structures MCQ - Set 19 - ObjectiveBooks

Design of Concrete Structures MCQ - Set 19

Practice Test: Question Set - 19

1. In order to obtain the best workability of concrete, the preferred shape of aggregate is
    (A) Rounded
    (B) Elongated
    (C) Angular
    (D) All of the above

2. Hydration of cement is due to chemical action of water with
    (A) Tricalcium silicate and dicalcium silicate
    (B) Dicalcium silicate and tricalcium aluminate
    (C) Tricalcium aluminate and tricalcium alumino ferrite
    (D) All the above

3. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
    (A) 22.5 mm
    (B) 18.5 mm
    (C) 16.5 mm
    (D) 13.5 mm

4. Approximate value of shrinkage strain in concrete, is
    (A) 0.003
    (B) 0.0003
    (C) 0.00003
    (D) 0.03

5. For quality control of Portland cement, the test essentially done is
    (A) Setting time
    (B) Tensile strength
    (C) Consistency
    (D) All the above

6. Strength of concrete with passage of time
    (A) Increases
    (B) Decreases
    (C) Fluctuates
    (D) Remains constant

7. Which of the following statements is incorrect?
    (A) Higher Vee-Bee time shows lower workability
    (B) Higher slump shows higher workability
    (C) Higher compacting factor shows higher workability
    (D) None of the above

8. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
    (A) 1100° and 1200°C
    (B) 1200° and 1300°C
    (C) 1300° and 1400°C
    (D) 1400° and 1500°C

9. In a pile of length ‘l’, the points of suspension from ends for lifting it are located at
    (A) 0.207 l
    (B) 0.25 l
    (C) 0.293 l
    (D) 0.333 l

10. Curing a concrete for long period ensures better
    (A) Volume stability
    (B) Strength
    (C) Water resistance
    (D) All the above

11. In a ring beam subjected to uniformly distributed load
    (i) Shear force at mid span is zero
    (ii) Shear force at mid span is maximum
    (iii) Torsion at mid span is zero
    (iv) Torsion at mid span is maximum
    The correct answer is
    (A) (i) and (iii)
    (B) (i) and (iv)
    (C) (ii) and (iii)
    (D) (ii) and (iv)

12. Batching error means inaccuracy in the quantity of
    (A) Aggregates
    (B) Cement
    (C) Water
    (D) All the above

13. If the storey height is equal to length of RCC wall, the percentage increase in strength is
    (A) 0
    (B) 10
    (C) 20
    (D) 30

14. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is
    (A) P = [(Z - X)/(Z - Y)] × 100
    (B) P = [(X - Z)/(Z - Y)] × 100
    (C) P = [(X - Z)/(Z + Y)] × 100
    (D) P = [(Z + X)/(Z - Y)] × 100

15. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called
    (A) Balanced beam
    (B) Under-reinforced beam
    (C) Over-reinforced beam
    (D) None of the above

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