861. 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
862. 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
863. 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
864. The speed of a turbine runner is
A. directly proportional to H1/2
B. inversely proportional to H1/2
C. directly proportional to H3/2
D. inversely proportional to H3/2
865. Discharge of a centrifugal pump is (where N = Speed of the pump impeller)
A. directly proportional to N
B. inversely proportional to N
C. directly proportional to N2
D. inversely proportional to N2
866. In a reaction turbine, the draft tube is used
A. to run the turbine full
B. to prevent air to enter the turbine
C. to increase the head of water by an amount equal to the height of the runner outlet above the tail race
D. to transport water to downstream
867. 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
868. 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
869. 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 water
870. 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
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