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Units in Properties of Fluids – MCQ Set with Explanations

 

MCQ Set with Explanations

Units in Properties of Fluids

1. The SI unit of density is:

  • A) kg/m

  • B) kg/m²

  • C) kg/m³

  • D) N/m³

Answer: C Explanation: Density is mass per unit volume, so the unit is kg/m³.


2. The SI unit of specific weight is:

  • A) N/m³

  • B) N·s/m²

  • C) kg/m³

  • D) m²/s

Answer: A Explanation: Specific weight = weight/volume → N/m³.


3. The SI unit of dynamic viscosity is:

  • A) Pa·s

  • B) m²/s

  • C) N/m

  • D) kg/m³

Answer: A Explanation: Dynamic viscosity (μ) is measured in Pascal‑seconds (Pa·s) or N·s/m².


4. The SI unit of kinematic viscosity is:

  • A) Pa·s

  • B) m²/s

  • C) N/m

  • D) m/s²

Answer: B Explanation: Kinematic viscosity (ν) = μ/ρ, so the unit is m²/s.


5. The SI unit of surface tension is:

  • A) N/m

  • B) N/m²

  • C) N·s/m²

  • D) m²/s

Answer: A Explanation: Surface tension is force per unit length → N/m.


6. The SI unit of pressure is:

  • A) N/m

  • B) N/m²

  • C) N·s/m²

  • D) m²/s

Answer: B Explanation: Pressure = force/area → N/m² = Pascal (Pa).


7. The SI unit of bulk modulus of elasticity is:

  • A) N/m

  • B) N/m²

  • C) m²/s

  • D) N·s/m²

Answer: B Explanation: Bulk modulus is pressure‑like, so the unit is Pascal (Pa).


8. The SI unit of vapor pressure is:

  • A) N/m

  • B) N/m²

  • C) N·s/m²

  • D) m²/s

Answer: B Explanation: Vapor pressure is a type of pressure → Pascal (Pa).


9. The SI unit of specific gravity is:

  • A) kg/m³

  • B) N/m³

  • C) Dimensionless

  • D) m²/s

Answer: C Explanation: Specific gravity is a ratio of densities, so it has no units.


10. The SI unit of viscosity index is:

  • A) Dimensionless

  • B) Pa·s

  • C) m²/s

  • D) N/m

Answer: A Explanation: Viscosity index is a comparative measure, so it is dimensionless.


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