Fluid Mechanics Test Questions - Set 6

1)   Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem_________________?

a. Venturimeter
b. Orifice plate
c. nozzle
d. pitot tube
e. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


2)   Dynamic viscosity of most of the liquids with rise in temperature__________________?

a. increases
b. decreases
c. remains unaffected
d. unpredictable
e. none of the above
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


3)   A metal with specific gravity of o floating in a fluid of same specific gravity a will____________________?

a. sink to bottom
b. float over fluid
c. partly immersed
d. be fully immersed with top surface at fluid surface
e. none of the above
Answer  Explanation 

ANSWER: be fully immersed with top surface at fluid surface

Explanation:
No explanation is available for this question!


4)   Manometer is used to measure__________________?

a. pressure in pipes, channels etc
b. atmospheric pressure
c. very low pressure
d. difference of pressure between two points
e. velocity
Answer  Explanation 

ANSWER: pressure in pipes, channels etc

Explanation:
No explanation is available for this question!


5)   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________________?sin 9

a. sin 9
b. sin 9
c. cas 9
d. cos 9
e. tan 9
Answer  Explanation 

ANSWER: sin 9

Explanation:
No explanation is available for this question!


6)   The resultant of all normal pressures acts___________________?

a. at e.g. of body
b. at center of pressure
c. vertically upwards
d. at metacentre
e. vertically downwards
Answer  Explanation 

ANSWER: vertically upwards

Explanation:
No explanation is available for this question!


7)   Metacentric height is the distance between the metacentre and_______________?

a. water surface
b. center of pressure
c. center of gravity
d. center of buoyancy
e. none of the above
Answer  Explanation 

ANSWER: center of gravity

Explanation:
No explanation is available for this question!


8)   The center of pressure of a surface subjected to fluid pressure is the point_______________?

a. on the surface at which resultant pres-sure acts
b. on the surface at which gravitational force acts
c. at which all hydraulic forces meet
d. similar to metacentre
e. where pressure equivalent to hydraulic thrust will act
Answer  Explanation 

ANSWER: on the surface at which resultant pres-sure acts

Explanation:
No explanation is available for this question!


9)   A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________?

a. 1
b. 5
c. 7
d. 6
Answer  Explanation 

ANSWER: 6

Explanation:
No explanation is available for this question!


10)   A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

a. 9,000 kg
b. 13,500 kg
c. 18,000 kg
d. 27,000 kg
e. 30,000 kg
Answer  Explanation 

ANSWER: 13,500 kg

Explanation:
No explanation is available for this question!


11)   If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be_________________?

a. 2 meters of water column
b. 3 meters of water column
c. 5 meters of water column
d. 6 meters of water Column
e. 7 meters of water column
Answer  Explanation 

ANSWER: 6 meters of water Column

Explanation:
No explanation is available for this question!


12)   When a body floating in a liquid, is displaced slightly, it oscillates about _________________?

a. e.g. of body
b. center of pressure
c. center of buoyancy
d. metacentre
e. liquid surface
Answer  Explanation 

ANSWER: metacentre

Explanation:
No explanation is available for this question!


13)   Ratio of inertia force to surface Jension is known as ___________________?

a. Mach number
b. Froude number
c. Reynold’s number
d. Weber’s number
e. none of the above
Answer  Explanation 

ANSWER: Weber’s number

Explanation:
No explanation is available for this question!


14)   Ratio of inertia force to elastic force is known as__________________?

a. Mach number
b. Froude number
c. Reynold’s number
d. Weber’s number
e. none of the above
Answer  Explanation 

ANSWER: Mach number

Explanation:
No explanation is available for this question!


15)   For a floating body to be in equilibrium_____________________?

a. meta centre should be above e.g.
b. centre of buoyancy and e.g. must lie on same vertical plane
c. a righting couple should be formed
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


16)   An open vessel of water is accelerated up an inclined plane. The free water surface will__________________?

a. be horizontal
b. make an angle in direction of inclination of inclined plane
c. make an angle in opposite direction to inclination of inclined plane
d. any one of above is possible
e. none of the above
Answer  Explanation 

ANSWER: make an angle in opposite direction to inclination of inclined plane

Explanation:
No explanation is available for this question!


17)   Resultant pressure of the liquid in the case of an immersed body acts through____________________?

a. centre of gravity
b. centre of pressure
c. metacentre
d. centre of buoyancy
e. in between e.g. and centre of pressure
Answer  Explanation 

ANSWER: centre of pressure

Explanation:
No explanation is available for this question!


18)   Differential monometer is used to measure___________________?

a. pressure in pipes, channels etc.
b. atmospheric pressure
c. very low pressure
d. difference of pressure between two points
e. velocity in pipes
Answer  Explanation 

ANSWER: difference of pressure between two points

Explanation:
No explanation is available for this question!


19)   The time oscillation of a floating body with increase in metacentric height will be_________________?

a. same
b. higher
c. lower
d. lower/higher depending on weight of body
e. unpredictable
Answer  Explanation 

ANSWER: lower

Explanation:
No explanation is available for this question!


20)   The normal stress is same in all directions at a point in a fluid_______________?

a. only when the fluid is frictionless
b. only when the fluid is incompressible and has zero viscosity
c. when there is no motion of one fluid layer relative to an adjacent layer
d. irrespective of the motion of one fluid layer relative to an adjacent layer
e. in case of an ideal fluid
Answer  Explanation 

ANSWER: when there is no motion of one fluid layer relative to an adjacent layer

Explanation:
No explanation is available for this question!