41. The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.
A. equal to
B. less than
C. more than
42. If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
A. neutral equilibrium
B. stable equilibrium
C. unstable equilibrium
D. none of these
43. The pressure measured with the help of a piezometer tube is in
A. N/mm2
B. N/m2
C. head of liquid
D. all of these
44. The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
A. w x Q x H
B. w x Q x hf
C. w x Q (H – hf)
D. w x Q (H + hf)
45. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
A. less than
B. more than
46. The weight per unit volume of a liquid at a standard temperature and pressure is called
A. specific weight
B. mass density
C. specific gravity
D. none of these
47. The center of buoyancy is the center of the area of the immersed body.
A. Correct
B. Incorrect
48. The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
A. The bodies A and B have equal stability
B. The body A is more stable than body B
C. The body B is more stable than body A
D. The bodies A and B are unstable
49. In open channels, the specific energy is the
A. total energy per unit discharge
B. total energy measured with respect to the datum passing through the bottom of the channel
C. total energy measured above the horizontal datum
D. kinetic energy plotted above the free surface of the water
50. The Bernoulli’s equation is based on the assumption that
A. there is no loss of energy of the liquid flowing
B. the velocity of flow is uniform across any cross-section of the pipe
C. no force except gravity acts on the fluid
D. all of the above