Mechanical Properties of Fluids

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Q. A fluid flows through a pipe with a diameter of 0.1 m at a velocity of 2 m/s. What is the flow rate?
  • A. 0.0157 m³/s
  • B. 0.0314 m³/s
  • C. 0.0628 m³/s
  • D. 0.0785 m³/s
Q. A fluid has a density of 850 kg/m³. What is the weight of 2 m³ of this fluid?
  • A. 1700 N
  • B. 2000 N
  • C. 1500 N
  • D. 1800 N
Q. A liquid has a surface tension of 0.072 N/m. What is the force acting on a 0.1 m long line on the surface of the liquid?
  • A. 0.0072 N
  • B. 0.072 N
  • C. 0.72 N
  • D. 0.1 N
Q. A tank is filled with water to a height of 5 m. What is the hydrostatic pressure at the bottom of the tank?
  • A. 490 Pa
  • B. 5000 Pa
  • C. 49000 Pa
  • D. 50000 Pa
Q. If the flow velocity doubles in a pipe, how does the kinetic energy per unit volume change?
  • A. It doubles
  • B. It quadruples
  • C. It remains the same
  • D. It halves
Q. If the viscosity of a fluid is 0.5 Pa.s and the shear stress is 10 Pa, what is the shear rate?
  • A. 5 s⁻¹
  • B. 20 s⁻¹
  • C. 15 s⁻¹
  • D. 25 s⁻¹
Q. What is the buoyant force acting on a submerged object with a volume of 0.2 m³ in water?
  • A. 1960 N
  • B. 2000 N
  • C. 1800 N
  • D. 2200 N
Q. What is the critical velocity for a fluid with a density of 1200 kg/m³ and a viscosity of 0.002 Pa.s in a pipe of diameter 0.1 m?
  • A. 0.5 m/s
  • B. 1.0 m/s
  • C. 1.5 m/s
  • D. 2.0 m/s
Q. What is the pressure at a depth of 10 meters in a fluid with a density of 1000 kg/m³? (Assume g = 9.81 m/s²)
  • A. 9810 Pa
  • B. 10000 Pa
  • C. 980 Pa
  • D. 1000 Pa
Q. What is the Reynolds number for a fluid with a density of 1000 kg/m³, a velocity of 1 m/s, and a dynamic viscosity of 0.001 Pa.s in a pipe with a diameter of 0.05 m?
  • A. 5000
  • B. 10000
  • C. 20000
  • D. 2500
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