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Test: Viscosity - 1 - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Viscosity - 1

Test: Viscosity - 1 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Viscosity - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Viscosity - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Viscosity - 1 below.
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Test: Viscosity - 1 - Question 1

 Water flows between two plates of which the upper one is stationary and the lower one is moving with a velocity V. What will be the velocity of the fluid in contact with the upper plate?

Detailed Solution for Test: Viscosity - 1 - Question 1

Explanation: According to the No-Slip condition, the relative velocity between the plate and the fluid in contact with it must be zero. Thus, the velocity of the fluid in contact with the upper plate is 0 and that with the lower plate is V.

Test: Viscosity - 1 - Question 2

 The viscous force ____ the relative motion between the adjacent layers of a fluid in motion.Which one of the flowing fits best in the sentence?

Detailed Solution for Test: Viscosity - 1 - Question 2

Explanation: Viscosity is the internal friction of a fluid in motion. It is the property by the virtue of which the relative motion between two adjacent fluid layers is opposed.

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Test: Viscosity - 1 - Question 3

The viscosity of a fluid in motion is 1 Poise. What will be it’s viscosity (in Poise) when the fluid is at rest?

Detailed Solution for Test: Viscosity - 1 - Question 3

Explanation: Viscosity is the property of a fluid and is constant for a given fluid under given conditions, irrespective of the fact whether the fluid is at rest or in motion.

Test: Viscosity - 1 - Question 4

Which of the following correctly states how the viscosities of a liquid and a gas will change with temperature?

Detailed Solution for Test: Viscosity - 1 - Question 4

Viscosity of a liquid is due to the cohesion between it’s molecules. With the increase in temperature of a liquid, cohesion increases, leading to the rise in viscosity. Viscosity of a gas is due to the momentum transfer between it’s molecules. With the increase in the temperature of a liquid, molecular motion increases, leading to the fall in viscosity.

Test: Viscosity - 1 - Question 5

Which one of the following is not a unit of dynamic viscosity?

Detailed Solution for Test: Viscosity - 1 - Question 5

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.

Test: Viscosity - 1 - Question 6

Newton's law of viscosity states that

Detailed Solution for Test: Viscosity - 1 - Question 6


Test: Viscosity - 1 - Question 7

 Which one of the following is the CGS unit of dynamic viscosity?

Detailed Solution for Test: Viscosity - 1 - Question 7

Explanation: 
where F= viscous force, A= area, du ⁄ dx = velocity gradient, μ = co-effcient of viscosity. Therefore,

CGS unit of μ is = dyne-s/cm2. 1 Poise= 1 dyne-s/cm2 and 1 Stokes= 1 cm2/s. Thus, the CGS unit of μ will be Poise. Stokes is the CGS unit of kinematic viscosity.

Test: Viscosity - 1 - Question 8

The dynamic viscosity of a fluid is 1 Poise. What should one multiply to it to get the answer in N-s/m2

Detailed Solution for Test: Viscosity - 1 - Question 8

Explanation:
1 Poise = 1 dyne-s/cm2  

Test: Viscosity - 1 - Question 9

Which of the following is a CGS unit of kinematic viscosity?

Test: Viscosity - 1 - Question 10

Which of the following is the dimension of kinematic viscosity? 

Detailed Solution for Test: Viscosity - 1 - Question 10

Explanation: ν = μ/ρ, where ν = kinematic viscosity, μ = dynamic viscosity and ρ = density of the fluid.

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