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WorksheetsFluid Mechanics 1
Total questions: 23
Worksheet time: 17mins
The property by virtue of which a liquid opposes relative motion between its different layers is called
Coefficient of viscosity
Viscosity
Osmosis
Surface tension
The sum of components of shear forces in the direction of flow of fluid is called as
skin drag
shear drag
friction drag
all of the above
When the flow parameters at any given instant remain same at every point, then flow is said to be
static
steady state
uniform
laminar
When is a liquid said to be not in a boiling or vaporized state?
If the pressure on liquid is more than its vapour pressure
If the pressure on liquid is equal to its vapour pressure
If the pressure on liquid is less than its vapour pressure
Unpredictable
A fluid will be called static fluid when-
Non-zero normal stress and zero shear stress
Zero normal stress and non-zero shear stress
Non-zero normal stress and shear stress
Zero normal stress and zero shear stress
Which one of the flowings is time-dependent non-Newtonian fluid?
Dilatent
Bingham plastic
Pseudo plastic
Rheopectic
Hydraulic lift is based on
Bernoulli's theorem
Archimedes' principle
Pascal's law
Stokes' law
If the Reynolds number is less than 2000, what is the flow type?
laminar
turbulent
transition
none of these
Density of the fluid is given as
ρ=massoffluid/volumeoffluid
ρ=massoffluid/volumeoffluid
ρ=massoffluid∗volumeoffluid
ρ = mass of fluid / volume of fluid
ρ = mass of fluid - volume of fluid
ρ = mass of fluid * volume of fluid
ρ = mass of fluid + volume of fluid
Which of the following contribute to the reason behind the origin of surface tension?
both cohesive forces and adhesive forces
neither cohesive forces nor adhesive forces
only adhesive forces
only cohesive forces
The rise in the level of a liquid in a tube is h. What will be the rise in the level if the same amount of liquid is poured into a tube of half the diameter.
0
h/2
h
2h
For an inclined plate the pressure intensity at every point differs.
true
false
Can centre of pressure for a vertical plane submerged surface be ever be above centre of Gravity
Yes
No
It can be above in cases where the surface height is very large
None of the mentioned
Which principle is used for calculating the centre of pressure?
Principle of momentum
Principle of conservation of energy
Principle of balancing of momentum
None of the mentioned
The three liquids 1, 2, and 3 with vapor pressures V1, V2 and V3 respectively, are kept under same pressure. If V1 > V2 > V3, which liquid will start boiling early?
liquid 1
liquid 2
liquid 3
they will start boiling at the same time
A beaker contains water up to a certain height as shown. If the water is allowed to get discharged through a small pipe (of a uniform diameter), what type of flow will it be in the pipe?
steady and uniform
unsteady and uniform
steady and non-uniform
unsteady and non-uniform
What will be the shape of the pathline for an one-dimensional flow be like?
straight line
parabolic
hyperbolic
elliptical
The velocity of a point in a flow is
along the streamline
tangent to the streamline
along the pathline
tangent to the pathline
If a liquid enters a pipe of diameter d with a velocity v, what will it’s velocity at the exit if the diameter reduces to 0.5d?
v
0.5v
2v
4v
Which method is most commonly used in fluid mechanics for analysis?
Eulerian Method
Langragian method
Control volume analysis
None of the mentioned
In laminar flow fluid particles flow along a streamline.
True
False
Local acceleration has constant value for a steady flow.
True
False
For incompressible fluid flow, if area reduces then what is the effect on the velocity.
increases
decreases
first increases then decreases
first decreases then increases
