Concrete Structures Questions and Answers pdf - Set 22 - ObjectiveBooks

Practice Test: Question Set - 22

1. In case of hand mixing of concrete, the extra cement to be added is
(A) 5 %
(B) 10 %
(C) 15 %
(D) 20 %

2. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,
(A) 20 %
(B) 25 %
(C) 30 %
(D) 35 %

3. The percentage of voids in cement is approximately
(A) 25 %
(B) 40 %
(C) 60 %
(D) 80 %

4. Water required per bag of cement, is
(A) 7 kg
(B) 14 kg
(C) 21 kg
(D) 35 kg

5. The recommended value of modular ratio for reinforced brick work is
(A) 18
(B) 30
(C) 40
(D) 58

6. For an ordinary Portland cement
(A) Residual does not exceed 10% when sieved through IS Sieve No. 9
(B) Soundness varies from 5 to 10 mm
(C) Initial setting time is not less than 30 minutes
(D) Compressive stress after 7 days, is not less than 175 kg/cm2

7. The ratio of the diameter of reinforcing bars and the slab thickness is
(A) 1/4
(B) 1/5
(C) 1/6
(D) 1/8

8. Pozzolana cement is used with confidence for construction of
(A) Dams
(B) Massive foundations
(C) R.C.C. structures
(D) All the above

9. Pick up the correct statement from the following:
(A) Calcium chloride acts as a retarder
(B) Calcium chloride acts as an accelerator
(C) Gypsum (calcium sulphate) acts as a retarder
(D) Both (b) and (c)

10. The operation of removing humps and hollows of uniform concrete surface, is known as
(A) Floating
(B) Screeding
(C) Trowelling
(D) Finishing

11. 1% of voids in a concrete mix would reduce its strength by about
(A) 5 %
(B) 10 %
(C) 15 %
(D) 20 %

12. Permissible compressive strength of M 200 concrete grade is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 250 kg/cm2

13. For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is
(A) 50 mm
(B) 75 mm
(C) 100 mm
(D) 120 mm

14. The most useless aggregate is one whose surface texture is
(A) Smooth
(B) Granular
(C) Glassy
(D) Honey combed and porous

15. The shrinkage of concrete
(A) Is proportional to water content is the mix
(B) Is proportional to cement concrete
(C) Increases with age of concrete
(D) All the above

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