Hydraulics and Fluid Mechanics Part 2

Attempt Free Hydraulics and Fluid Mechanics Part 2 Here. Read The Important Civil MCQ From Below.

Q1. When a bubble rises from the bottom of a lake to the surface, its radius doubles. The atmospheric pressure is equal to that of a column of water of height H. The depth of the lake is
A. H
B. 2H
C. 7H
D. 8H

Answer : C

Q2. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D

Answer : B

Hydraulics and Fluid Mechanics Part 2

Q3. When the flow in open channel is gradually varied, the flow is said to be
A. Steady uniform flow
B. Steady non-uniform flow
C. Unsteady uniform flow
D. Unsteady non-uniform flow

Answer : B

Q4. When a ship floats on water
A. It displaces no water
B. The weight of water displaced is equal to the weight of the ship
C. The weight of water displaced is lesser than the weight of the ship
D. The weight of water displaced is greater than the weight of the ship

Answer : B

Q5. The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001

Answer : B

Q6. In a tank or channel, notch is provided measure
A. Velocity
B. Pressure
C. Discharge
D. Static energy

Answer : C

Hydraulics and Fluid Mechanics Part 2

Q7. A boat with scrap iron is floating in a lake. If the scrap iron is thrown in the lake the water level will
A. Go up
B. Go down
C. Remain unchanged
D. None of the above

Answer : B

Q8. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is.
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data

Answer : A

Q9. The thickness of boundary layer at the leading, (entrance) edge will be
A. Maximum
B. Minimum
C. Zero
D. Average

Answer : C

Hydraulics and Fluid Mechanics Part 2

Q10. The specific gravity of water at standard temperature (4°C) equals to
A. 0.999
B. 1.000
C. 1.010
D. 0.500

Answer : B

Q11. Select the correct statement.
A. The absolute roughness of a pipe de-creases with time.
B. A pipe becomes smooth after using for long time.
C. The friction factor decreases with time.
D. The absolute roughness increases with time.

Answer : D

Q12. The unit of kinematic viscosity is.
A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. cm2/sec

Answer : D

Q13. The bodies which have definite separation points fixed by their shapes are known as
A. Stream lined bodies
B. Bluft bodies
C. Both (A) and (B)
D. None of the above

Answer : A

Hydraulics and Fluid Mechanics Part 2

Q14. Pressure measured with the help of piezometer tube is
A. Atmospheric pressure
B. Gauge pressure
C. Absolute pressure
D. Vacuum pressure

Answer : B

Q15. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is.
A. d > m > e
B. d > e > m
C. e > m > d
D. e > d > m

Answer : D