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Properties of Fluids – MCQ Set with Explanations

 

  MCQ Set with Explanations

Properties of Fluids

1. The ratio of mass of a fluid to its volume:

  • A) Weight density

  • B) Density

  • C) Specific volume

  • D) Specific gravity

Answer: B Explanation: Density or mass density is defined as the ratio of the mass of fluid to its volume.


2. Volume of fluid occupied by a unit mass is called:

  • A) Density

  • B) Specific gravity

  • C) Specific Volume

  • D) Surface tension

Answer: C Explanation: Specific Volume is defined as the volume of fluid occupied by a unit mass or volume per unit mass of the fluid.


3. The SI unit of dynamic viscosity is:

  • A) m²/s

  • B) N·s/m²

  • C) kg/m³

  • D) Pa

Answer: B Explanation: Dynamic viscosity is measured in N·s/m² (also written as Pa·s).


4. Kinematic viscosity is defined as:

  • A) Dynamic viscosity × density

  • B) Dynamic viscosity / density

  • C) Density / dynamic viscosity

  • D) Specific gravity × dynamic viscosity

Answer: B Explanation: ν=μ/ρ, where ν is kinematic viscosity.


5. Surface tension is caused by:

  • A) Gravity

  • B) Cohesive forces

  • C) Adhesive forces

  • D) Pressure difference

Answer: B Explanation: Surface tension arises due to cohesive forces between liquid molecules.


6. A fluid is defined as a substance that:

  • A) Has fixed shape

  • B) Cannot be compressed

  • C) Deforms continuously under shear stress

  • D) Has no mass

Answer: C Explanation: Continuous deformation under shear stress is the defining property of fluids.


7. The bulk modulus of elasticity is a measure of:

  • A) Resistance to shear

  • B) Resistance to compression

  • C) Resistance to bending

  • D) Resistance to flow

Answer: B Explanation: Bulk modulus indicates how much a fluid resists compression.


8. The vapor pressure of a liquid is:

  • A) Pressure at which liquid freezes

  • B) Pressure exerted by vapor in equilibrium with liquid

  • C) Pressure at which liquid boils

  • D) Pressure due to surface tension

Answer: B Explanation: Vapor pressure is the pressure exerted by vapor molecules above a liquid in equilibrium.


9. Cavitation occurs when:

  • A) Pressure falls below vapor pressure

  • B) Velocity becomes zero

  • C) Density increases

  • D) Temperature decreases

Answer: A Explanation: When local pressure drops below vapor pressure, vapor bubbles form and collapse, causing cavitation.


10. Specific gravity is defined as the ratio of:

  • A) Density of fluid to density of water

  • B) Density of fluid to density of air

  • C) Viscosity of fluid to viscosity of water

  • D) Weight of fluid to weight of air

Answer: A Explanation: Specific gravity compares a fluid’s density to that of water at 4°C.



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