Hydraulics & Fluid Mechanics Mcqs - Set 1

1)   Hot wire anemometer is used to measure_______________?

a. discharge
b. velocity of gas
c. pressure intensity of gas
d. pressure intensity of liquid
Answer  Explanation 

ANSWER: velocity of gas

Explanation:
No explanation is available for this question!


2)   Density of water is maximum at ___________________?

a. 0°C
b. 0°K
c. 4°C
d. 100°C
e. 20°C.
Answer  Explanation 

ANSWER: 100°C

Explanation:
No explanation is available for this question!


3)   Property of a fluid by which its own molecules are attracted is called ________________?

a. adhesion
b. cohesion
c. viscosity
d. compressibility
e. surface tension
Answer  Explanation 

ANSWER: cohesion

Explanation:
No explanation is available for this question!


4)   The property of a fluid which enables it to resist tensile stress is known as________________?

a. compressibility
b. surface tension
c. cohesion
d. adhesion
e. viscosity
Answer  Explanation 

ANSWER: cohesion

Explanation:
No explanation is available for this question!


5)   The specific weight of water is 1000 kg/m” _______________?

a. at norma] pressure of 760 mm
b. at 4°C temperature
c. at mean sea level
d. all the above
e. none of the above.
Answer  Explanation 

ANSWER: all the above

Explanation:
No explanation is available for this question!


6)   When the flow parameters at any given instant remain same at every point, then flow is said to be____________________?

a. quasi static
b. steady state
c. laminar
d. uniform
e. static
Answer  Explanation 

ANSWER: uniform

Explanation:
No explanation is available for this question!


7)   The normal stress in a fluid will be constant in all directions at a point only if_________________?

a. it is incompressible
b. it has uniform viscosity
c. it has zero viscosity
d. it is frictionless
e. it is at rest
Answer  Explanation 

ANSWER: it is at rest

Explanation:
No explanation is available for this question!


8)   An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is___________________?

a. 10m/sec2
b. 9.81 m/sec2
c. 10.2/m sec
d. 9.75 m/sec2
e. 9 m/sec
Answer  Explanation 

ANSWER: 10m/sec2

Explanation:
No explanation is available for this question!


9)   The surface tension of mercury at normal temperature compared to that of water is____________________?

a. more
b. less
c. same
d. more or less depending on size of glass tube
e. none of the above
Answer  Explanation 

ANSWER: more

Explanation:
No explanation is available for this question!


10)   For very great pressures, viscosity of moss gases and liquids __________________?

a. remains same
b. increases
c. decreases
d. shows erratic behaviour
e. none of the above
Answer  Explanation 

ANSWER: shows erratic behaviour

Explanation:
No explanation is available for this question!


11)   Viscosity of water in comparison to mercury is ______________________?

a. higher
b. lower
c. same
d. higher/lower depending on temperature
e. unpredictable
Answer  Explanation 

ANSWER: higher

Explanation:
No explanation is available for this question!


12)   The bulk modulus of elasticity __________________?

a. has the dimensions of 1/pressure
b. increases with pressure
c. is large when fluid is more compressible
d. is independent of pressure and viscosity
e. is directly proportional to flow
Answer  Explanation 

ANSWER: increases with pressure

Explanation:
No explanation is available for this question!


13)   The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?

a. 1000
b. 2100
c. 2700
d. 10,000
e. 21,000
Answer  Explanation 

ANSWER: 21,000

Explanation:
No explanation is available for this question!


14)   Surface tension _____________________?

a. acts in the plane of the interface normal to any line in the surface
b. is also known as capillarity
c. is a function of the curvature of the interface
d. decreases with fall in temperature
e. has no units
Answer  Explanation 

ANSWER: acts in the plane of the interface normal to any line in the surface

Explanation:
No explanation is available for this question!


15)   A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is _________________?

a. 400 kg/cm2
b. 4000 kg/cm2
c. 40 x 105 kg/cm2
d. 40 x 106 kg/cm2
e. none of the above
Answer  Explanation 

ANSWER: 4000 kg/cm2

Explanation:
No explanation is available for this question!


16)   Units of surface tension are_________________?

a. energy/unit area
b. distance
c. both of the above
d. it has no units
e. none of the above
Answer  Explanation 

ANSWER: both of the above

Explanation:
No explanation is available for this question!


17)   Choose the correct relationship_________________?

a. specific gravity = gravity x density
b. dynamicviscosity = kinematicviscosity x density
c. gravity = specific gravity x density
d. kinematicviscosity = dynamicviscosity x density
e. hydrostaticforce = surface tension x gravity
Answer  Explanation 

ANSWER: dynamicviscosity = kinematicviscosity x density

Explanation:
No explanation is available for this question!


18)   For manometer, a better liquid combination is one having______________?

a. higher surface tension
b. lower surface tension
c. surface tension is no criterion
d. high density and viscosity
e. low density and viscosity
Answer  Explanation 

ANSWER: higher surface tension

Explanation:
No explanation is available for this question!


19)   Alcohol is used in manometer, because___________________?
Choose the wrong statement ?


a. its vapour pressure is low
b. it provides suitable meniscus for the inclined tube
c. its density is less
d. it provides longer length for a given pressure difference
e. it provides accurate readings
Answer  Explanation 

ANSWER: its vapour pressure is low

Explanation:
No explanation is available for this question!


20)   The property of fluid by virtue of which it offers resistance to shear is called____________________?

a. surface tension
b. adhesion
c. cohesion
d. viscosity
e. all of the above
Answer  Explanation 

ANSWER: viscosity

Explanation:
No explanation is available for this question!