Hydraulics And Fluid Mechanics(Civil Engineering ) Questions and Answers

Question 1. The difference of pressure between the inside and outside of a liquid drop is
  1.    $${\text{p}} = {\text{T}} \times {\text{r}}$$
  2.    $${\text{p}} = \frac{{\text{T}}}{{\text{r}}}$$
  3.    $${\text{p}} = \frac{{\text{T}}}{{2{\text{r}}}}$$
  4.    $${\text{p}} = \frac{{2{\text{T}}}}{{\text{r}}}$$
Explanation:-
Answer: Option D. -> $${\text{p}} = \frac{{2{\text{T}}}}{{\text{r}}}$$
Question 2. The line of action of the buoyant force acts through the
  1.    centroid of the volume of fluid vertically above the body
  2.    center of the volume of floating body
  3.    center of gravity of any submerged body
  4.    centriod of the displaced volume of fluid
Explanation:-
Answer: Option D. -> centriod of the displaced volume of fluid
Question 3. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
  1.    the weight of the body
  2.    more than the weight of the body
  3.    less than the weight of the body
  4.    weight of the fluid displaced by the body
Explanation:-
Answer: Option D. -> weight of the fluid displaced by the body
Question 4. Fluid is a substance that
  1.    cannot be subjected to shear forces
  2.    always expands until it fills any container
  3.    has the same shear stress.at a point regardless of its motion
  4.    cannot remain at rest under action of any shear force
Explanation:-
Answer: Option D. -> cannot remain at rest under action of any shear force
Question 5. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is
  1.    22.5 m/sec.
  2.    33 m/sec.
  3.    40 m/sec.
  4.    90 m/sec.
Explanation:-
Answer: Option C. -> 40 m/sec.
Question 6. Flow at constant rate through a tapering pipe isi) steady flowii) uniform flowiii) unsteady flowiv) non-uniform flowThe correct answer is
  1.    (i) and (ii)
  2.    (i) and (iv)
  3.    (ii) and (iii)
  4.    (ii) and (iv)
Explanation:-
Answer: Option B. -> (i) and (iv)
Question 7. Select the correct statement
  1.    Local atmospheric pressure depends upon elevation of locality only
  2.    Standard atmospheric pressure is the mean local atmospheric pressure at sea level
  3.    Local atmospheric pressure is always below standard atmospheric pressure
  4.    A barometer reads the difference be-tween local and standard atmospheric pressure
Explanation:-
Answer: Option B. -> Standard atmospheric pressure is the mean local atmospheric pressure at sea level
Question 8. The increase in meta centric heighti) increases stabilityii) decreases stabilityiii) increases comfort for passengersiv) decreases comfort for passengersThe correct answer is
  1.    (i) and (iii)
  2.    (i) and (iv)
  3.    (ii) and (iii)
  4.    (ii) and (iv)
Explanation:-
Answer: Option B. -> (i) and (iv)
Question 9. Drag force is a function ofi) projected area of the bodyii) mass density of the fluidiii) velocity of the bodyThe correct answer is
  1.    (i) and (ii)
  2.    (i) and (iii)
  3.    (ii) and (iii)
  4.    (i), (ii) and (iii)
Explanation:-
Answer: Option D. -> (i), (ii) and (iii)
Question 10. Least possible value of correction factor fori) kinetic energy is zeroii) kinetic energy is 1iii) momentum is zeroiv) momentum is 1The correct statements are
  1.    (i) and (iii)
  2.    (ii) and (iii)
  3.    (i) and (iv)
  4.    (ii) and (iv)
Explanation:-
Answer: Option D. -> (ii) and (iv)
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