Viscosity
Q. What is the primary factor that affects the viscosity of a gas?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular weight
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Solution
The viscosity of a gas is primarily affected by temperature; as temperature increases, viscosity also increases.
Correct Answer: A — Temperature
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Q. What is the primary reason for the increase in viscosity of a liquid with molecular weight?
A.
Increased intermolecular forces
B.
Decreased temperature
C.
Increased pressure
D.
Decreased density
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Solution
Higher molecular weight leads to increased intermolecular forces, resulting in higher viscosity.
Correct Answer: A — Increased intermolecular forces
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Q. What is the relationship between shear rate and viscosity in a Newtonian fluid?
A.
Directly proportional
B.
Inversely proportional
C.
No relationship
D.
Exponential relationship
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Solution
In a Newtonian fluid, shear stress is directly proportional to shear rate.
Correct Answer: A — Directly proportional
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Q. What is the relationship between shear stress and shear rate in a Newtonian fluid?
A.
Directly proportional
B.
Inversely proportional
C.
Exponential
D.
No relationship
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Solution
In a Newtonian fluid, shear stress is directly proportional to shear rate, which defines its viscosity.
Correct Answer: A — Directly proportional
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Q. What is the relationship between temperature and viscosity for most liquids?
A.
Viscosity increases with temperature
B.
Viscosity decreases with temperature
C.
Viscosity remains constant
D.
Viscosity fluctuates randomly
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Solution
For most liquids, viscosity decreases with an increase in temperature due to increased molecular motion.
Correct Answer: B — Viscosity decreases with temperature
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Q. What is the SI unit of dynamic viscosity?
A.
Pascal-second
B.
Newton-second
C.
Kilogram-meter
D.
Joule-second
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Solution
The SI unit of dynamic viscosity is Pascal-second (Pa·s).
Correct Answer: A — Pascal-second
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Q. What is the SI unit of viscosity?
A.
Pascal-second
B.
Newton-second
C.
Kilogram-meter per second
D.
Joule-second
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Solution
The SI unit of viscosity is Pascal-second (Pa·s), which is equivalent to Newton-second per square meter.
Correct Answer: A — Pascal-second
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Q. What is the term for the measure of a fluid's resistance to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Temperature
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Solution
Viscosity is the measure of a fluid's resistance to flow, indicating how thick or thin the fluid is.
Correct Answer: B — Viscosity
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Q. What is the term for the resistance of a fluid to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Temperature
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Solution
Viscosity is the term used to describe the resistance of a fluid to flow.
Correct Answer: B — Viscosity
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Q. What is the viscosity of water at 20°C?
A.
0.001 Pa·s
B.
0.01 Pa·s
C.
0.1 Pa·s
D.
1 Pa·s
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Solution
The viscosity of water at 20°C is approximately 0.001 Pa·s.
Correct Answer: A — 0.001 Pa·s
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Q. What type of fluid exhibits a constant viscosity regardless of the shear rate?
A.
Newtonian fluid
B.
Non-Newtonian fluid
C.
Ideal fluid
D.
Real fluid
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Solution
Newtonian fluids have a constant viscosity that does not change with the shear rate.
Correct Answer: A — Newtonian fluid
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Q. What type of fluid has a constant viscosity regardless of the shear rate?
A.
Newtonian fluid
B.
Non-Newtonian fluid
C.
Ideal fluid
D.
Real fluid
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Solution
A Newtonian fluid has a constant viscosity that does not change with the shear rate.
Correct Answer: A — Newtonian fluid
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Q. Which equation is used to calculate the viscosity of a fluid in a capillary tube?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Navier-Stokes equation
D.
Continuity equation
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Solution
Poiseuille's law is used to calculate the viscosity of a fluid in a capillary tube.
Correct Answer: B — Poiseuille's law
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Q. Which equation is used to calculate the viscosity of a fluid in a pipe?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Continuity equation
D.
Navier-Stokes equation
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Solution
Poiseuille's law is used to calculate the viscosity of a fluid in a pipe.
Correct Answer: B — Poiseuille's law
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Q. Which equation relates the viscosity of a fluid to the flow rate in a capillary tube?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Continuity equation
D.
Ideal gas law
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Solution
Poiseuille's law describes the flow of a viscous fluid through a capillary tube and relates viscosity to flow rate.
Correct Answer: B — Poiseuille's law
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Q. Which of the following equations is used to calculate dynamic viscosity?
A.
Bernoulli's equation
B.
Navier-Stokes equation
C.
Poiseuille's law
D.
Archimedes' principle
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Solution
Dynamic viscosity can be calculated using Poiseuille's law.
Correct Answer: C — Poiseuille's law
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Q. Which of the following equations represents the relationship between shear stress and shear rate in a Newtonian fluid?
A.
τ = μ(du/dy)
B.
τ = ρg
C.
F = ma
D.
P = F/A
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Solution
In a Newtonian fluid, shear stress (τ) is directly proportional to the shear rate (du/dy) with the proportionality constant being the dynamic viscosity (μ).
Correct Answer: A — τ = μ(du/dy)
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Q. Which of the following factors does NOT affect the viscosity of a fluid?
A.
Temperature
B.
Pressure
C.
Density
D.
Flow rate
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Solution
Flow rate does not affect the viscosity of a fluid; viscosity is a property of the fluid itself.
Correct Answer: D — Flow rate
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Q. Which of the following fluids has the highest viscosity?
A.
Water
B.
Honey
C.
Air
D.
Olive oil
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Solution
Honey has a higher viscosity compared to water, air, and olive oil due to its thicker consistency.
Correct Answer: B — Honey
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Q. Which of the following fluids is likely to have the highest viscosity?
A.
Water
B.
Honey
C.
Air
D.
Gasoline
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Solution
Honey has a much higher viscosity compared to water, air, and gasoline.
Correct Answer: B — Honey
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Q. Which of the following is a characteristic of a non-Newtonian fluid?
A.
Constant viscosity
B.
Viscosity changes with shear rate
C.
Incompressible
D.
Always flows in a straight line
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Solution
Non-Newtonian fluids exhibit a change in viscosity with varying shear rates, unlike Newtonian fluids which have a constant viscosity.
Correct Answer: B — Viscosity changes with shear rate
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Q. Which of the following is a non-Newtonian fluid?
A.
Water
B.
Glycerin
C.
Cornstarch in water
D.
Mercury
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Solution
Cornstarch in water exhibits non-Newtonian behavior, as its viscosity changes with the applied shear stress.
Correct Answer: C — Cornstarch in water
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Q. Which of the following is a property of a Newtonian fluid?
A.
Viscosity changes with shear rate
B.
Constant viscosity regardless of shear rate
C.
Non-linear flow behavior
D.
High compressibility
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Solution
A Newtonian fluid has a constant viscosity regardless of the shear rate.
Correct Answer: B — Constant viscosity regardless of shear rate
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Q. Which of the following is an example of a non-Newtonian fluid?
A.
Water
B.
Air
C.
Cornstarch in water
D.
Glycerin
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Solution
Cornstarch in water (oobleck) is a non-Newtonian fluid that exhibits varying viscosity depending on the shear rate.
Correct Answer: C — Cornstarch in water
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Q. Which of the following statements about viscosity is true?
A.
Viscosity is a scalar quantity
B.
Viscosity is a vector quantity
C.
Viscosity is temperature independent
D.
Viscosity increases with shear rate
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Solution
Viscosity is a scalar quantity that measures a fluid's resistance to flow.
Correct Answer: A — Viscosity is a scalar quantity
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