Fluid Mechanics MCQs : Here you will find MCQ Questions related to Fluid Mechanics. These MCQ Questions Will help you to improve your Fluid Mechanics knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
A fluid is a Tresca material with ___________ cohesion.
D. All of the above
Explanation: A fluid is a Tresca material with zero cohesion. Fluid is in a state of failure
Ideal fluids are?
C. Both viscous and non-viscous
D. None of the above
Explanation: Ideal fluids are non-viscous which means they will have zero viscosity.
The value of the surface tension of an ideal fluid is
D. more than that of a real fluid
Explanation: Ideal fluids haze zero surface tension but real fluids have some finite value of surface tension.
If a person studies about a fluid which is at rest, what will you call his domain of study?
A. Fluid Mechanics
B. Fluid Statics
C. Fluid Kinematics
D. Fluid Dynamics
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.
Which one of the following is the unit of mass density?
A. kg = m
B. kg = m^2
C. kg = m^3
D. kg = ms
Explanation: Mass Density(p) is defined as the mass(m) per unit volume(V ), i.e., p = m ⁄v
Thus, the unit of p is kg = m3.
The specific gravity of a liquid has
A. the same unit as that of mass density
B. the same unit as that of weight density
C. the same unit as that of specific volume
D. No Unit
Explanation: The specific gravity of a liquid is the ratio of two similar quantities (densities) which makes it unitless.
A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific weight of the liquid will be
A. 6:5 kN = m^3
B. 6:6 kN = m^3
C. 6:7 kN = m^3
D. 6:8 kN = m^3
Explanation: Specific weight(γ) is defined as the weight(w) per unit volume(V ), i.e.,
γ = w⁄V
Thus, γ = 6:5 ⁄10-3 N ⁄ m3 = 6:5 kN/m^3.
For an incompressible fluid does density vary with temperature and pressure?
A. It varies for all temperature and pressure range
B. It remains constant
C. It varies only for lower values of temperature and pressure
D. It varies only for higher values of temperature and pressure
Explanation: For an incompressible fluid, the change in density is negligible. Thus it does not change with temperature and pressure.
If there is bucket full of oil and bucket full of water and you are asked to lift them, which one of the two will require more effort given that volume of buckets remains same?
A. Oil bucket
B. Water bucket
C. Equal effort will be required to lift both of them
D. Can not say
Explanation: Density of water is more that oil. Hence, its weight for same volume of oil will also be higher. Therefore, more effort will be required.
Should Specific Wieght of incompressible fluid only be taken at STP?
A. Yes, as specific weight may show large variation with temperature and pressure
B. It should be taken at standard pressure but temperature may be any value
C. It should be taken at standard temperature but pressure may be any value
D. No, it can be taken for any temperature and pressure
Explanation: Specific weight is inversely proportional to volume. For incompressible fluid , variation of volume with temperature and pressure is negligible for practical consideration. Therefore, specific weight remains constant.