Which statement is incorrect about hydraulic systems?
Hydraulic systems rely on incompressible fluids to transmit pressure effectively (Pascal’s law). The incorrect statement is that they use highly compressible fluids, which would reduce efficiency. As per NCERT, applying relevant law/formula with correct units and sign convention leads to They use highly compressible fluids. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.