RCC Design & Concrete Technology Objective Questions - Set 16 - ObjectiveBooks

# Practice Test: Question Set - 16

1. Poisson's ratio for concrete
(A) Remains constant
(B) Increases with richer mixes
(C) Decreases with richer mixes
(D) None of the above

2. Shrinkage in concrete can be reduced by using
(A) Low water cement ratio
(B) Less cement in the concrete
(C) Proper concrete mix
(D) All the above

3. The shuttering of a hall measuring 4 m × 5 m, can be removed after
(A) 5 days
(B) 7 days
(C) 10 days
(D) 14 days

4. The approximate value of the ratio between direct tensile strength and flexural strength is
(A) 0.33
(B) 0.5
(C) 0.75
(D) 1.0

5. An aggregate is said to be flaky if its least dimension is less than
(A) 1/5th of mean dimension
(B) 2/5th of mean dimension
(C) 3/5th of mean dimension
(D) 4/5th of mean dimension

(A) Fly ash
(B) Hydrated lime
(C) Calcium chloride
(D) All the above

7. Workability of concrete is inversely proportional to
(A) Time of transit
(B) Water-cement ratio
(C) The air in the mix
(D) Size of aggregate

8. Pick up the correct statement from the following:
(A) The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
(B) The total water is the free water and the amount actually absorbed by the aggregates
(C) Neither (a) nor (b)
(D) Both (a) and (b)

9. Inert material of a cement concrete mix, is
(A) Water
(B) Cement
(C) Aggregate
(D) None of these

10. If a beam fails in bond, then its bond strength can be increased most economically by
(A) Increasing the depth of beam
(B) Using thinner bars but more in number
(C) Using thicker bars but less in number
(D) Providing vertical stirrups

11. Pick up the incorrect statement from the following:
(A) A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
(B) The strength of concrete decreases as the water cement ratio increases
(C) Good compaction by mechanical vibrations, increases the strength of concrete
(D) None of these

12. Ordinary Portland cement is manufactured from
(A) Lime stone and clay
(B) Gypsum and lime
(C) Pozzolana
(D) Lime, pozzolana and clay

13. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than
(A) 0.15
(B) 0.12
(C) 0.30
(D) 1.00

14. Addition of pozzolana to cement
(A) Decreases workability
(B) Increases strength
(C) Increases heat of hydration
(D) None of these

15. If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
(A) 8 kg
(B) 10 kg
(C) 12 kg
(D) 14 kg

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