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Which one of the following is not a unit of dynamic viscosity?
- a)Pa-s
- b)N-s/m2
- c)Poise
- d)Stokes
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which one of the following is not a unit of dynamic viscosity?a)Pa-sb)...
Explanation: 
where F= viscous force, A= area, du ⁄ dx = velocity gradient, μ = co-effcient of viscosity. Therefore,
SI unit of μ is N-s/m2 = Pa-s and CGS unit of μ is dyne-s/cm2.
1 Poise= 1 dyne-s/cm2 and 1 Stokes= 1 cm2/s.
Thus, Stokes is not an unit of μ, rather it is a unit of kinematic viscosity υ.
where F= viscous force, A= area, du ⁄ dx = velocity gradient, μ = co-effcient of viscosity. Therefore,
SI unit of μ is N-s/m2 = Pa-s and CGS unit of μ is dyne-s/cm2.
1 Poise= 1 dyne-s/cm2 and 1 Stokes= 1 cm2/s.
Thus, Stokes is not an unit of μ, rather it is a unit of kinematic viscosity υ.
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Most Upvoted Answer
Which one of the following is not a unit of dynamic viscosity?a)Pa-sb)...
Pascal is N/m2.
Unit of dynamic viscosity Pascal-sec
1pascal-sec=.1poise
Stoke is unt of kinematic viscosity
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Which one of the following is not a unit of dynamic viscosity?a)Pa-sb)...
The unit of dynamic viscosity is a measure of a fluid's resistance to flow. It is the ratio of shear stress to shear rate, and it is commonly expressed in units such as pascal-second (Pa-s), newton-second per square meter (N-s/m^2), poise (P), or stokes (St).
In this question, we are asked to identify the unit of dynamic viscosity that does not exist. Let's examine each option:
a) Pa-s: This is a valid unit of dynamic viscosity. It represents the viscosity of a fluid in pascal-seconds, where 1 Pa-s is equal to 1 N-s/m^2.
b) N-s/m^2: This is also a valid unit of dynamic viscosity. It represents the viscosity of a fluid in newton-seconds per square meter, which is equivalent to pascal-seconds.
c) Poise: This is another valid unit of dynamic viscosity. It is a CGS unit and represents the viscosity of a fluid in dyne-seconds per square centimeter. One poise is equal to 0.1 Pa-s.
d) Stokes: This is the correct answer. The stoke is a unit of kinematic viscosity, not dynamic viscosity. It is the ratio of dynamic viscosity to the density of the fluid. The unit of stokes is centimeter squared per second (cm^2/s). Kinematic viscosity is commonly used in fluid mechanics, but it is not a unit of dynamic viscosity.
In summary, the unit of dynamic viscosity that does not exist is stokes. The correct answer is option D.
In this question, we are asked to identify the unit of dynamic viscosity that does not exist. Let's examine each option:
a) Pa-s: This is a valid unit of dynamic viscosity. It represents the viscosity of a fluid in pascal-seconds, where 1 Pa-s is equal to 1 N-s/m^2.
b) N-s/m^2: This is also a valid unit of dynamic viscosity. It represents the viscosity of a fluid in newton-seconds per square meter, which is equivalent to pascal-seconds.
c) Poise: This is another valid unit of dynamic viscosity. It is a CGS unit and represents the viscosity of a fluid in dyne-seconds per square centimeter. One poise is equal to 0.1 Pa-s.
d) Stokes: This is the correct answer. The stoke is a unit of kinematic viscosity, not dynamic viscosity. It is the ratio of dynamic viscosity to the density of the fluid. The unit of stokes is centimeter squared per second (cm^2/s). Kinematic viscosity is commonly used in fluid mechanics, but it is not a unit of dynamic viscosity.
In summary, the unit of dynamic viscosity that does not exist is stokes. The correct answer is option D.
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Which one of the following is not a unit of dynamic viscosity?a)Pa-sb)N-s/m2c)Poised)StokesCorrect answer is option 'D'. Can you explain this answer?
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