Design of Concrete Structures-Data Intensity 4 Multiple Questions and Answers.




1.If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be____?
A. 0.35 d
B. 0.40 d
C. 0.45 d
D. Dependent on grade of concrete also

2.Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is______?
A. M15
B. M20
C. M10
D. M25

3.Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is_______________?
A. 28 liters
B. 30 liters
C. 32 liters
D. 34 liters

4.For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be______?
A. 0.75-0.80
B. 0.80-0.85
C. 0.85 � 0.92
D. Above 0.92

5.In case of hand mixing of concrete, the extra cement to be added is_________?
A. 5%
B. 10%
C. 15%
D. 20%

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