ANS:B - convection

When warm and cold liquids are mixed, the heat transfer is mainly by: b) convection Convection is the dominant mode of heat transfer when fluids are involved. In the case of mixing warm and cold liquids, convection plays a significant role as the warmer fluid transfers heat to the cooler fluid through the bulk movement of fluid particles (i.e., mixing). While conduction may also occur at the interface between the two fluids, it is typically less significant compared to convective heat transfer in this scenario. Radiation is negligible in the context of mixing liquids at ordinary temperatures and pressures.