Hydraulics and Fluid Mechanics Online Quiz questions and answers

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1. Barometer is used to measure
pressure in pipes, channels etc	atmospheric pressure
very low pressure	difference of pressure between two points

2. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea
Venturimeter	Orifice plate
hot wire anemometer	pitot tube

3. Which of the following instrument can be used for measuring speed of an aeroplane
Venturimeter	Orifice plate
hot wire anemometer	pitot tube

4. Piezometer is used to measure
pressure in pipe, channels etc.	atmospheric pressure
very low pressures	difference of pressure between two points

5. Which of the following instruments is used to measure flow on the application of Bernoulli's theorem
Venturimeter	Orifice plate
nozzle	all of the above

6. The speed of sound in a ideal gas varies directly as its _____.
pressure	temperature
density	absolute temperature

7. Dynamic viscosity of most of the liquids with rise in temperature
increases	decreases
remains unaffected	unpredictable

8. Dynamic viscosity of most of the gases with rise in temperature
increases	decreases
remains unaffected	unpredictable

9. A metal with specific gravity of o floating in a fluid of same specific gravity a will
sink to bottom	float over fluid
partly immersed	be fully immersed with top surface at fluid surface

10. Euler's dimensionless number relates the following
inertial force and gravity	viscous force and inertial force
viscous force and buoyancy force	pressure force and inertial force

11. Manometer is used to measure
pressure in pipes, channels etc.	very low pressure
atmospheric pressure	difference of pressure between two points

12. Which of the following manometer has highest sensitivity
U-tube with water	inclined U-tube
U-tube with mercury	micro-manometer with water

13. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to
tan 9	sin 9
casS	cos 9

14. Working principle of dead weight pressure gauge tester is based on _____.
Pascal's law	Dalton's law of partial pressure
Newton's law of viscosity	Avogadro's hypothesis

15. The resultant of all normal pressures acts
at e.g. of body	at centre of pressure
vertically upwards	at metacentre

16. Centre of pressure compared to e.g. is _____.
above it	below it
at same point	above or below depending on area of body

17. Metacentric height is the distance between the metacentre and _____.
water surface	centre of pressure
centre of gravity	centre of buoyancy

18. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called
upthrust	reaction
buoyancy	metacentre

19. The centre of pressure of a surface subjected to fluid pressure is the point _____.
on the surface at which resultant pressure acts	on the surface at which gravitational force acis
at which all hydraulic forces meet	similar to metacentre

20. Buoyant force is ______.
the resultant force acting on a floating body	the resultant force on a body due to the fluid surrounding it
equal to the volume of liquid displaced	the force necessary to maintain equilibrium of a submerged body