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
Modulus of rupture of concrete is a measure of_______________?
(A) flexural tensile strength
(B) direct tensile strength
(C) compressive strength
(D) split tensile strength
To determine the modulus of rupture, the size of test specimen used is_______________?
(A) 150 x150 x500 mm
(B) 100 x100 x700 mm
(C) 150 x150 x700 mm
(D) 100 x100 x500 mm
The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called________________?
(A) segregation
(B) bleeding
(C) bulking
(D) creep
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
Air entrainment in the concrete increases________________?
(A) workability
(B) strength
(C) the effects of temperature variations
(D) the unit weight
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
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
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