Pressure and Its Measurement topics include: Pressure distribution in fluid, pressure measurement, pascals law and compression fluid pressure point. In fluid mechanics, pressure is the force exerted on an area. The formula for calculating pressure is P = F/A, where F is force and A is area.  Here are some types of pressure measurement: Absolute pressure: The total value of the force per unit area exerted by a fluid surface. Absolute pressure is the difference between the pressure at a given point in a fluid and total zero pressure or a perfect vacuum. Absolute pressure is measured with... Show more

Pressure and Its Measurement topics include: Pressure distribution in fluid, pressure measurement, pascals law and compression fluid pressure point.

In fluid mechanics, pressure is the force exerted on an area. The formula for calculating pressure is P = F/A, where F is force and A is area. 

Here are some types of pressure measurement:
Absolute pressure: The total value of the force per unit area exerted by a fluid surface. Absolute pressure is the difference between the pressure at a given point in a fluid and total zero pressure or a perfect vacuum. Absolute pressure is measured with reference to the absolute zero in the pressure scale.
Gauge pressure: The pressure measured above atmospheric pressure. 

Different types of pressure measurement apparatus include: Barometers, Manometers, Mechanical gauges. 
A manometer is a pressure measuring device that balances a column of liquid with the same or another column of liquid. Manometers measure the pressure of liquid relative to an external source, which is usually the earth's atmosphere. 
Differential pressure is the difference in pressure between two points in a fluid system. 
Fluid pressure is measured in Pascals (Pa), where one Pascal is equal to one Newton per square meter (N/m2)

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Fluid Mechanics Practice Test: Pressure and Its Measurement

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25 Questions

1. A closed tank (each side of 5 m) is partially filled with fluid as shown. If the pressure of the air above the fluid is 2 bar, find the pressure at the bottom of the tank. Assume the density ρ of the fluid to vary according to the given relation:

766786796776

2. An open tank contains water upto a depth of 350 cm and above it an oil of specific gravity 0.65 for a depth of 2.5 m. Find the pressure intensity at the extreme bottom of the tank.

10.05 N/cm25.027 N/cm22.51 N/cm2None of the mentioned

3. We can draw Mohr’s circle for a fluid at rest.

MaybeTrueFalseDon't Know

4. A beaker is filled with a liquid up to a height h. If A and B are two points, one on the free surface and one at the base as shown, such that the minimum distance between the two is l, what will be the pressure at point B?

ρg\(\sqrt{l^2 – h^2}\) ρg\(\sqrt{l^2 + h^2}\) ρghρgl

5. A Hydraulic press has a ram of 30 cm diameter and a plunger of of 2 cm diameter. It is used for lifting a weight of 35 kN. Find the force required at the plunger.

311.1 kN466.6 kN155.5 kN233.3 kN

6. Pressure variation for compressible fluid is maximum for which kind of process?

Quasi StaticNone of the mentionedIsothermalAdiabatic

7. A beaker is filled with a liquid of density ρ1 up to a certain height. A is a point, h m downwards from the free surface such that the pressure at A is P. If the liquid is replaced by equal volume of another liquid of density ρ2, at what distance from the free surface will the pressure be P now?

h\(\frac{ρ2}{ρ1}\) h\(\frac{ρ1}{ρ2}\) h\(\frac{ρ1 + ρ2}{2}\) h

8. A beaker is filled with a liquid of density ρ1 up to a certain height. A is a point, h m downwards from the free surface of the liquid as shown. The liquid is replaced by equal volume of another liquid of density ρ2. If ρ1 > ρ2, how will the pressure at point A change?

become zerodecreaseincreaseremain same

9. If the pressure at a point is 1m of water, what will be it’s value in terms of m of oil? (Take, the specific gravity of oil to be 0.8)

1.2512.50.8

10. Which device is popularly used for measuring difference of low pressure?

U-tube Differential ManometerVertical Single column manometerInverted U-tube Differential ManometerInclined Single column manometer

11. A cuboidal container (each side of 30 cm0) is completely filled with water. A is a point, 25 cm above the base such that the pressure at point A is P. At what height (in cm) from the base will the pressure be 2P?

12.5201510

12. A beaker of height 15 cm is partially filled with a liquid and is rotated by an angle θ as shown.
If the pressure at point B becomes 5 bar, what will be the value of θ?

70o60o30o50o

13. A beaker is filled with a liquid of density ρ₁ up to a certain height. The pressure at the base of the beaker id P_b. If the liquid is replaced by an equal volume of another liquid of density ρ₂, what will be the pressure at the base of the beaker now?

\(\frac{ρ2}{ρ1}\) Pb\(\frac{ρ1}{ρ2}\) Pb\(\frac{ρ1 + ρ2}{2}\) PbPb

14. A closed tank (of height 5 m) is P_Artially filled with a liquid as shown. If the pressure of the air above the fluid is 2 bar, find the pressure at the bottom of the tank. Assume the density of the liquid to vary according to the following relation:

where y is the height from the base

2.182.52.122.15

15. A beaker half-filled with water is exposed to the atmosphere. If the pressure at points A, B and C as shown are P_a, P_b and P_c respectively, which one of the following will be the relation connecting the three?

Pa < Pb = PcPa < Pb < PcPa > Pb > PcPa > Pb = Pc

16. Pressure intensity or force due to pressure gradient for fluid at rest is considered as which kind of force?

None of the mentionedForce due to motionSurface forceBody force

17. A beaker of height h is completely filled with water. Now two-third of the liquid is replaced by another liquid. If the pressure at the base of the beaker doubled, what is the specific gravity of the liquid poured?

2.50.512

18. The arm of a teapot is 10 cm long and inclined at an angle of 60^o to the vertical. The center of the arm base is 2 cm above the base of the beaker. Water is poured into the beaker such that half the arm is filled with it. What will be the pressure at the base of the beaker if the atmospheric pressure is 101.3 kPa?

101.5101.9101.7101.3

19. Three beakers 1, 2 and 3 of different shapes are kept on a horizontal table and filled with water up to a height h. If the pressure at the base of the beakers are P₁, P₂ and P₃ respectively, which one of the following will be the relation connecting the three?

P1 > P2 < P3P1 > P2 > P3P1 < P2 < P3P1 = P2 = P3

20. Calculate the hydrostatic pressure for water moving with constant velocity at a depth of 5 m from the surface.

since fluid is in motion, we cannot analyse49 kN/m298 kN/m2None of the mentioned

21. Which one of the following is the unit of pressure?

N/m3N/m2N/mN

22. A tank of height 3 m is completely filled with water. Now two-third of the liquid is taken out and an equal amount of two other immiscible liquids of specific gravities 0.8 and 1.2 are poured into the tank. By what percent will the pressure at the base of the tank change?

0%5%lower10%higher5%higher

23. A Differential manometer is connected at the points A and Bat the centre of two pipes. The pipe A(left limb) contains a liquid of specific gravity = 1.5 while pipe B (right limb)contains a liquid of specific gravity 0.85. The pressure at A and B are .5 kgf/cm² and 1.2 kgf/cm2 respectively. Find the difference in level of mercuru in the differential manometer. A is 2.5m above B and 5 m above the mercury in its own limb. B is 2.5 m above the mercury level in limb A.

6.28 cm10.85 cm25.5 cm12.7 cm

24. .What is the variation observed in temperature in atmosphere with respect to elevation?"

It first decreases then increasesIt goes on decreasing with heightIt first increases then decreasesIt goes on increasing with height

25. For what height of the mercury column will the pressure inside the gas be 40 cm Hg vacuum?

116403676