______ is that branch of science which deals with behaviour of the fluids (liquids or gases) at rest as well as in motion.
Try it first: pick an option, then read the explanation.
Asked in SSC JE 06/06/2024 (09am-11am)
Detailed Explanation
Fluid mechanics encompasses all aspects of fluid behavior. It is broadly partitioned into fluid statics (fluids at rest), fluid kinematics (fluids in motion without considering forces), and fluid dynamics (fluids in motion considering forces).
Why “Fluid mechanics” Is Correct
Fluid mechanics encompasses both rest (statics) and motion (kinematics and dynamics) for liquids as well as gases. The other terms are narrower sub-disciplines restricted to liquids or to specific motion states.
Why the Other Options Are Wrong
- A. Hydrostatics: Hydrostatics deals exclusively with liquids at rest.
- B. Hydrokinematics: Hydrokinematics deals with the motion of liquids without considering the forces causing the motion.
- C. Hydrokinetics: Hydrokinetics (or hydrodynamics) deals with liquids in motion with consideration of the acting forces.
Key Point
Fluid mechanics is the overarching science of fluids at rest (statics) and in motion (dynamics/kinematics).
Key Concepts for Students
- Fluid statics: study of fluids at rest, where shear stresses are zero.
- Fluid kinematics: study of velocity, acceleration, and streamlines without force considerations.
- Fluid dynamics: study of fluid motion considering pressure forces, gravity, and viscous shear.
Practice more: this is question 5 in Properties of Fluid MCQs – Part 1. Try the whole set and check every answer instantly.