Fluid Mechanics Mid - I, September - 2014

1.In C.G.S system the unit for viscosity is
  • Stoke
  • Poise
  • Dyne
  • Erg
Answer: B
2.A real fluid in which the shear stress is directly proportional to the rate of shear strain( velocity gradient) is known as ……….. Fluid
  • Newtonian
  • Ideal
  • Real
  • Non-Newtonian fluid
Answer: A
3.The phenomenon of rise or fall of a liquid level surface In a small tube relative to the adjacent general level of liquid when the tube is held vertically in the liquid is known as
  • Capillarity
  • Surface tension
  • Compressibility
  • Viscosity
Answer: A
4.Piezometer is a
  • Differential Manometer
  • Simple Manometer
  • Barometer
  • None
Answer: B
5.The continuity equation 1A1V1 = A2V2 is applicable to ……………………fluids
  • Compressible
  • Incompressible
  • Compressible and Incompressible
  • None
Answer: C
6.The flow of a fluid along a curved path is known as
  • Turbulent flow
  • Linear flow
  • Vortex flow
  • Rotational flow
Answer: C
7.For flow, if the force due to turbulence (Ft) is negligible the resulting equation of motions is known as
  • Reynold’s equation
  • Navier-Stokes equation
  • Euler’s equation
  • None
Answer: B
8.The value of co-efficient of discharge of venturimeter is
  • Zero to 1
  • Greater than 1
  • -1
  • Lesser than 1
Answer: D
9.The centre of gravity of the volume of the liquid displaced by an immersed body is called
  • Meta-centre
  • Centre of pressure
  • Centre of gravity
  • Centre of buoyancy
Answer: D
10.The capillary rise at 200Cin a clean glass tube of 1mm bore containing water is approximately
  • 1mm
  • 5mm
  • 30mm
  • 29mm
Answer: C
11.The dimension formula for coefficient of viscosity is_____________________.
Answer: M1L-1T-1
12.The continuity equation is connected with Low of _______________________.
Answer: Conservation of mass
13.Liquids transmit pressure equally in all the directions is called ___________________
Answer: Pascal’s law
14.Flow meters based on obstruction principle like orifice plates can be used with Reynold’s Number up to approximately __________________
Answer: 2000
15.A piece weighing 3kg in air is found to weigh 2.5kg when submerged in water its specific gravity is ________________________
Answer: 6
16.Bernoulli’s equation write __________________
Answer: P/g + v2/2g + z = constant
17.The flow in which the density of fluid changes from point to point is called __________________ flow
Answer: Compressible flow
18.The atmospheric and absolute pressures at a point below the free surface of a liquid are respectively 100062 N/m2 and 145090 N /m2, then the gauge pressure will be ___________________
Answer: 45028 N/m2
19.Compressibility is the reciprocal of _______________________
Answer: Bulk modulus
20.A plate 0.025 mm distant from a fixed plate, moves at 60 cm/s and requires a force of 2 N per unit area to maintain this speed. The viscosity between the plates is _______________________
Answer: 8.35×10-5 Ns/m2