Q.1
Newton’s law of viscosity is a relationship between
  • shear stress anctthejiate of angular distortion
  • shear stress and viscosity
  • shear stress, velocity and viscosity
  • pressure, velocity and viscosity
Q.2
An ideal fluid is
  • one which obeys Newton’s law of viscosity
  • frictionless and incompressible
  • very viscous
  • frictionless and compressible
Q.3
The surface tension of mercury at normal temperature compared to that of water is
  • more
  • less
  • same
  • more or less depending on size of glass tube
Q.4
Non uniform flow occurs when
  • the direction and magnitude of the velocity at all points are identical
  • the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
  • the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
  • velocity, depth, pressure, etc. change from point to point in the fluid flow.
Q.5
Fluid is a substance which offers no resistance to change of
  • pressure
  • flow
  • shape
  • volume
Q.6
Surface energy per unit area of a surface is numerically equal to
  • atmospheric pressure
  • surface tension
  • force of adhesion
  • force of cohesion
Q.7
Flow of water in a pipe about 3 meters in diameter can be measured by
  • orifice plate
  • venturi
  • rotameter
  • pitot tube
Q.8
Free surface of a liquid tends to contract to the smallest possible area due to force of
  • surface tension
  • viscosity
  • friction
  • cohesion
Q.9
Buoyant force is
  • resultant force acting on a floating body
  • equal to the volume of liquid displaced
  • force necessary to keep a body in equilibrium
  • the resultant force on a body due to the fluid surrounding it
Q.10
Alcohol is used in manometers because
  • it has low vapour pressure
  • it is clearly visible
  • it has low surface tension
  • it can provide longer column due to low density
Q.11
A perfect gas
  • has constant viscosity
  • is incompressible
  • is of theoretical interest
  • none of the above.
Q.12
When a body floating in a liquid, is displaced slightly, it oscillates about
  • e.g. of body
  • center of pressure
  • center of buoyancy
  • metacentre
Q.13
Mercury is often used in barometer because
  • it is the best liquid
  • the height of barometer will be less
  • its vapour pressure is so low that it may be neglected
  • both (B) and (C)
Q.14
Operation of McLeod gauge used for low pressure measurement is based on the principle of
  • gas law
  • Boyle’s law
  • Charle’s law
  • Pascal’s law
Q.15
Pressure of the order of 10''' torr can be measured by
  • Bourdon tube
  • Pirani Gauge
  • micro-manometer
  • ionisastion gauge
Q.16
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
  • 1/3
  • 1/4
  • 1/2
  • 2/3
Q.17
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
  • 1/2
  • 2/3
  • 3/2
  • 2
Q.18
Specific weight of sea water is more that of pure water because it contains
  • dissolved air
  • dissolved salt
  • suspended matter
  • all of the above
Q.19
Coefficient of contraction for an external cylindrical mouthpiece is
  • 1.00
  • 0.855
  • 0.7H
  • 0.611
Q.20
Resultant pressure of the liquid in the case of an immersed body acts through
  • center of gravity
  • center of pressure
  • metacentre
  • center of buoyancy
Q.21
For a floating body to be in equilibrium
  • meta center should be above e.g.
  • center of buoyancy and e.g. must lie on same vertical plane
  • a righting couple should be formed
  • all of the above
Q.22
In which of the following the friction drag is generally larger than pressure drag?
  • a circular disc or plate held normal to flow
  • a sphere
  • a cylinder
  • an airfoil
Q.23
The resultant of all normal pressures acts
  • at e.g. of body
  • at center of pressure
  • vertically upwards
  • at metacentre
Q.24
The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to
  • 1 Pa
  • 91 Pa
  • 981 Pa
  • 9810 Pa
Q.25
The normal stress is same in all directions at a point in a fluid
  • only when the fluid is frictionless
  • only when the fluid is incompressible and has zero viscosity
  • when there is no motion of one fluid layer relative to an adjacent layer
  • irrespective of the motion of one fluid layer relative to an adjacent layer
Q.26
A liquid compressed in cylinder has a volume of 0.m3 atkg/cm² and a volume of 0.m3 atkg/cm². The bulk modulus of elasticity of liquid is
  • 400 kg/cm²
  • 4000 kg/cm²
  • 40 x 105 kg/cm²
  • 40 x 106 kg/cm²
Q.27
An open vessel of water is accelerated up an inclined plane. The free water surface will
  • be horizontal
  • make an angle in direction of inclination of inclined plane
  • make an angle in opposite direction to inclination of inclined plane
  • any one of above is possible
Q.28
An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to
  • g/3
  • g/2
  • 2g/3
  • g
Q.29
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
  • minimum
  • maximum
  • negative value
  • could be any value
Q.30
Choose the wrong statement.Alcohol is used in manometer, because
  • its vapour pressure is low
  • it provides suitable meniscus for the inclined tube
  • its density is less
  • it provides longer length for a given pressure difference
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