Fluid Mechanics (Chemical Perspective) – Multiple Choice Questions (MCQs)

1. 1. What is the primary focus of fluid mechanics in chemical engineering?

   • A. To study the deformation of solids
   • B. To understand the behavior of fluids (liquids and gases) at rest and in motion
   • C. To analyze chemical reactions
   • D. To design electrical circuits

2. 2. What is a 'fluid'?

   • A. A substance that continuously deforms (flows) under an applied shear stress
   • B. A substance with a fixed shape and volume
   • C. A substance that resists deformation
   • D. A substance that only exists as a solid

3. 3. What is 'density' (ρ)?

   • A. Mass per unit volume
   • B. Volume per unit mass
   • C. Force per unit area
   • D. Energy per unit mass

4. 4. What is 'specific gravity'?

   • A. The ratio of the density of a fluid to the density of a reference fluid (usually water at 4°C)
   • B. The density of a fluid in SI units
   • C. The viscosity of a fluid
   • D. The pressure of a fluid

5. 5. What is 'viscosity' (μ)?

   • A. A measure of a fluid's resistance to flow
   • B. A measure of a fluid's density
   • C. A measure of a fluid's temperature
   • D. A measure of a fluid's pressure

6. 6. What is the unit of dynamic viscosity (μ) in SI units?

   • A. Pa·s (Pascal-second)
   • B. N·m
   • C. kg/s
   • D. m/s

7. 7. What is 'kinematic viscosity' (ν)?

   • A. Dynamic viscosity divided by density
   • B. Density divided by dynamic viscosity
   • C. Pressure divided by density
   • D. Temperature multiplied by dynamic viscosity

8. 8. What is the unit of kinematic viscosity (ν) in SI units?

   • A. m/s
   • B. m²/s
   • C. Pa·s
   • D. kg/m³

9. 9. What is a 'Newtonian fluid'?

   • A. A fluid whose viscosity is constant regardless of the shear rate
   • B. A fluid whose viscosity changes with shear rate
   • C. A fluid that behaves like a solid
   • D. A fluid that cannot flow

10. 10. What is a 'non-Newtonian fluid'?

    • A. A fluid whose viscosity is constant
    • B. A fluid whose viscosity changes with shear rate
    • C. A fluid that behaves like a solid
    • D. A fluid that cannot flow

11. 11. What is 'pressure' (P)?

    • A. Force per unit area
    • B. Mass per unit volume
    • C. Energy per unit mass
    • D. Velocity per unit time

12. 12. What is 'absolute pressure'?

    • A. Pressure measured relative to a perfect vacuum
    • B. Pressure measured relative to atmospheric pressure
    • C. Pressure measured by a gauge
    • D. Pressure in a closed system