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Fluid Mechanics and Properties
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Fluid Mechanics and Properties
Fluid Mechanics and Properties
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1
Question
Fluid is a substance that
Answer
D. cannot remain at rest under action of any shear force
2
Question
Density of water is maximum at
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B. 4C
3
Question
Property of a fluid by which its own molecules are attracted is called
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B. cohesion
4
Question
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
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A. adhesion
5
Question
The normal stress in a fluid will be constant in all directions at a point only if
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D. it is at rest
6
Question
Specific weight of sea water is more that of pure water because it contains
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B. dissolved salt
7
Question
Free surface of a liquid tends to contract to the smallest possible area due to force of
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A. surface tension
8
Question
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
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B. more
9
Question
Barometer is used to measure
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B. atmospheric pressure
10
Question
Manometer is used to measure
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A. pressure in pipes, channels etc
11
Question
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
Answer
C. lower than the surface of liquid
12
Question
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
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C. lower than the surface of liquid
13
Question
When a fluid is subjected to resistance, it undergoes a volumetric change due to
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C. Compressibility
14
Question
Liquids transmit pressure equally in all the directions. This is according to
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C. Pascals law
15
Question
The rise or depression of liquid in a tube due to surface tension with an increase in size of tube will
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D. decrease
16
Question
Mercury is often used in barometer because
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D. both b and c
17
Question
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
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B. center of pressure
18
Question
Which of the following is the correct relation between centroid cg and the center of pressure cp of a plane submerged in a liquid?
Answer
A. cg is always below cp
19
Question
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centroid, if
Answer
A. the area is horizontal
20
Question
Choose the wrong statement A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface B. The horizontal component acts through the center of pressure for the vertical projection C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area D. The vertical component passes through the center of pressure of the volume
Answer
D. The vertical component passes through the center of pressure of the volume
21
Question
Center of pressure on an inclined plane is A. at the centroid B. above the centroid C. below the centroid D. at metacenter
Answer
C. below the centroid
22
Question
Can center of pressure for a vertical plane submerged surface be ever be above center of gravity? A. Yes B. No C. It can be above in cases where the surface height is very large D. None of the mentioned
Answer
B. No
23
Question
In a vertically submerged plane surface, pressure at every point remains same. A. True B. False
Answer
B. False
24
Question
For an inclined plate the pressure intensity at every point differs. A. True B. False
Answer
A. True
25
Question
The magnitude of total pressure and center of pressure is independent on the shape of the submerged plane surface. A. True B. False
Answer
B. False
26
Question
What is the variation of total pressure with depth for any submerged surface if we neglect variation in the density? A. Linear B. Parabolic C. Curvilinear D. Logarithmic
Answer
A. Linear
27
Question
The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to A. Equilibrium of a floating body B. Archimedes principle C. Bernoullis theorem D. Metacentric principle
Answer
B. Archimedes principle