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Civil Engineering Objective Questions { Structural Design Specifications }



15. For concreting of shallow sections with vibration, the workability of concrete should be
A. very low
B. low
C. medium
D. high.

16.  For achieving suitably a low permeability ?
A. strong and dense aggregates are used
B. low water ? cement ratio is used
C. proper curing is done for hydration
D. All the above.

17.  For nominal mix concrete M 20, the required quantity of water per 50 kg. of cement, is
A. 60 litres
B. 45 litres
C. 34 litres
D. 30 litres.

18.  For nominal mix concrete M 15, the required weight of fine and coarse aggregates is 350 kg and the volume of water is
A. 30 litres
B. 32 litres
C. 34 litres
D. 45 litres.

19. For the proportions
A. 1 : 1 ?2, the maximum size of aggregates, is 10 mm
B. 1 : 2, the maximum size of aggregates, is 20 mm
C. 1 2 , the maximum size of aggregates, is 40 mm
D. All the above.

20. Moist sand may contain surface water by mass upto
A.7.50%
B.5.00%
C.2.50%
D. 1.25%.

21. To achieve uniform colour and consistency of the concrete by using ordinary Portland cement, the mixing time may be
A. j2' to 1 minute
B. 1 to 1-2 minutes,
C. 1-2 to 2 minutes
D. 2 to 2 minutes

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