A. aggregate cement ratio
B. time of transit
C. grading of the aggregate
D. all of above
Related Mcqs:
- Workability of concrete is inversely pro¬portional to______________?
A. time of transit
B. ‘vater-cement ratio
C. the air in the mix
D. size of aggregate - 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 - 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 - Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is_____________?
A. M15
B. M20
C. M 10
D. M25 - The property of the ingredients to separate from each other while placing the concrete is called____________?
A. segregation
B. compaction
C. shrinkage
D. bulking - According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as______________?
A. Ec = = 5700
B. Ec = = 570
C. Ec = = 5700fck
D. Ec = where fck N/mm2 = 700 is the characteristic strength in - Modulus of rupture of concrete is a measure of_______________?
A. flexural tensile strength
B. direct tensile strength
C. compressive strength
D. split tensile strength - 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 - According to IS : 456-1978, the fiexural strength of concrete is________________?
A. directly proportional to compressive strength
B. inversely proportional to compressive strength
C. directly proportional to square root of compressive strength
D. inversely proportional to square root of compressive strength - In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?
A. compressive and tensile
B. tensile and compressive
C. both compressive
D. both tensile
