AIIMS 2018 Physics Viscosity Assertion Reason Question

The assertion is true because friction with the walls of the pipe and internal viscous forces in the fluid indeed convert some kinetic energy into heat, demonstrating the principles of fluid dynamics and energy dissipation. The reason is also true, as it accurately describes the effects of friction on energy transformation within the fluid system. Since the reason directly explains the assertion by highlighting the mechanisms of energy conversion, option A is correct. Other options are incorrect because they either misrepresent the relationship between the assertion and reason or incorrectly state the truth value of either statement.