A. Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive
forces
B. A hydrometer used for the determination of specific gravities of liquids works on the principle
of buoyant forces
C. In case of unsteady fluid flow, the velocity at any given point does not change with time
D. Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure &
velocity at a point
Related Mcqs:
- Pick out the wrong statement?
A. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
B. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity
distribution
C. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
D. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes - Pick out the wrong statement?
A. The eddy viscosity is a function of the type of turbulence involved
B. The eddy viscosity is a fluid property
C. The viscosity of gas increases with increase in temperature
D. The viscosity of a liquid increases with decrease in temperature - Pick out the wrong statement about a streamline ?
A. It is always parallel to the main direction of the fluid flow
B. It is a line across which there is no flow and it is equivalent to a rigid boundary
C. Streamlines intersect at isolated point of zero velocity and infinite velocity
D. The fluid lying between any two streamlines can be considered to be in isolation and the
streamline spacing varies inversely as the velocity - Pick out the wrong statement?
A. The form drag is dependent upon the occurrence of a wake
B. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance
C. An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid. - Pick out the wrong statement ?
A. Momentum transfer in laminar flow results from velocity gradient
B. A fluid in equilibrium is not free from shear stress
C. The viscosity of a non-Newtonian fluid is a function of temperature only
D. Both B. and C. - Pick out the wrong statement ?
A. In a static mass of liquid, the pressure at a point is the same for all liquids
B. Pressure decreases exponentially with elevation in an isothermal atmosphere
C. Atmospheric pressure = absolute pressure ‒ gage pressure
D. As per Pascal’s law, the pressure at a point in a static or uniformly moving fluid is equal in all
directions - Pick out the wrong statement?
A. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp
B. In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively
C. Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion
D. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids - Pick out the wrong statement?
A. The vacuum pressure is always the negative gauge pressure
B. The pressure of the liquid measured by a piezometer tube is the gauge pressure
C. Manometric liquid should have high surface tension
D. The point at which the resultant pressure on an immersed surface acts, is known as the centre
of gravity - Pick out the wrong statement pertaining to fluid flow ?
A. The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid
in circular pipes is 0.5
B. The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe
C. Navier-Stokes equation is applicable to the analysis of viscous flows
D. Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids - Pick out the wrong statement about cavitation?
A. Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
B. Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in
formation & collapse of vapor cavities
C. Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines
resulting in audible noise
D. Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine
blades
