For M 150 mix concrete, according to I.S. specifications, local bond stress, is A. 5 kg/cm2 B. 10 kg/cm2 C. 15 kg/cm2 D. 20 kg/cm2

The correct answer is: B. 10 kg/cm2

Local bond stress is the stress that develops between the concrete and the reinforcement at the interface of the two materials. It is a function of the strength of the concrete, the strength of the reinforcement, and the surface roughness of the reinforcement.

The IS 456:2000 code specifies that the minimum local bond stress for M150 mix concrete is 10 kg/cm2. This means that the concrete must be able to withstand a tensile stress of at least 10 kg/cm2 at the interface with the reinforcement.

The other options are incorrect because they are not within the range of values specified by the IS 456:2000 code.