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Test: Introduction to Fluid Mechanics - Mechanical Engineering MCQ


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10 Questions MCQ Test Fluid Mechanics for Mechanical Engineering - Test: Introduction to Fluid Mechanics

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Test: Introduction to Fluid Mechanics - Question 1

The value of the surface tension of an ideal fluid is

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 1

Explanation: Ideal fluids haze zero surface tension but real fluids have some finite value of surface tension.

Test: Introduction to Fluid Mechanics - Question 2

 Which one is in a state of failure?

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 2

Explanation: A fluid is a Tresca material with zero cohesion. In simple words, fluid is in a state of failure.

Test: Introduction to Fluid Mechanics - Question 3

The value of the viscosity of an ideal fluid is

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 3

Correct option is A.
A fluid that has no resistance to shear stress between its layers is known as an ideal fluid. Hence ideal fluid  has zero viscosity.

Test: Introduction to Fluid Mechanics - Question 4

 A small shear force is applied on an element and then removed. If the element regains it’s original position, what kind of an element can it be?

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 4

Explanation: Fluids (liquids and gases) cannot resist even a small shear force and gets permanently deformed. Hence, the element must be a solid element.

Test: Introduction to Fluid Mechanics - Question 5

 In which type of matter, one won’t find a free surface?

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 5

Explanation: Solid molecules have a definite shape due to large inter-molecular forces. In liquids, molecules are free to move inside the whole mass but rarely escape from itself. Thus, liquids can form free surfaces under the effect of gravity. But, in case of gases, molecules tend to escape due to low forces of attraction. Thus, gases won’t form any free surface.

Test: Introduction to Fluid Mechanics - Question 6

 If a person studies about a fluid which is at rest, what will you call his domain of study?

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 6

Explanation: Fluid Mechanics deals with the study of fluid at rest or in motion with or without the consideration of forces, Fluid Statics is the study of fluid at rest, Fluid Kinematics is the study of fluid in motion without consideration of forces and Fluid Dynamics is the study of fluid in motion considering the application forces.

Test: Introduction to Fluid Mechanics - Question 7

 The value of the compressibility of an ideal fluid is

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 7

Ideal fluids are incompressible which means they will have zero compressibility.

Test: Introduction to Fluid Mechanics - Question 8

The value of the Bulk Modulus of an ideal fluid is

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 8

Explanation: Bulk modulus k is the reciprocal of compressibility fi.
k = 1fi
Ideal fluids are incompressible which means fi = 0. Thus, k will be infinity.

Test: Introduction to Fluid Mechanics - Question 9

When subjected to shear force, a fluid :

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 9

A fluid is defined as a substance that deforms continuously whilst acted upon by any forcetangential to the area on which it acts. Such a force is termedashear force, and theratio of the shear force to the area on which it acts is known astheshear stress

Test: Introduction to Fluid Mechanics - Question 10

Shear stress in static fluid is

Detailed Solution for Test: Introduction to Fluid Mechanics - Question 10

When a fluid is at rest neither shear forces nor shear stresses exist in it.

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