Which term uses liquid pressure?

• A. Pneumatics
• B. Lubrication
• C. Hydraulics
• D. Alignment

Answer: (C)

Liquid pressure and how it is utilized to generate force is what this question focuses on. In hydraulics, a confined liquid transmits applied pressure throughout the system; because liquids are nearly incompressible, a force applied to a small piston can be converted into a larger force on a bigger piston, enabling lifting, clamping, braking, and other powerful actions. This principle underpins many heavy-duty machines and braking systems, where precise, controllable force is needed.

Pneumatics, by contrast, uses a gas such as air, which is compressible, so pressure behaves differently and is suited to lighter tasks. Lubrication involves a liquid primarily to reduce friction and wear, not to transfer or amplify force. Alignment is about positioning components correctly and does not involve transmitting liquid pressure. So the term that uses liquid pressure to transmit and multiply force is hydraulics.