Biofluids and Mechanics Mid - I, September - 2014

1.A Newtonian fluid is a fluid in which the viscous stresses arising from its flow, at every point, are linearly proportional to the local
  • strain rate
  • stress rate
  • shock rate
  • Independent
Answer: A
2.After a fatty meal plasma transiently appears turbid. Within the body the blood is permanently fluid, and …………… flow assures that cells and plasma are fairly homogeneously mixed.
  • Turbulent
  • Eddies
  • Laminar
  • constant
Answer: C
3.If the fluid is also isotropic it means
  • its mechanical properties are not same along any direction
  • its mechanical properties are the same along any direction
  • its chemical properties are the same along any direction
  • its physical properties are not same along any direction
Answer: B
4.The viscosity tensor ………… to two real coefficients, describing the fluid's resistance to continuous shear deformation and continuous compression or expansion, respectively.
  • Increases
  • reduces
  • remains constant
  • No change
Answer: B
5.Many common liquids and gases, can be assumed to be Newtonian for practica calculations under ordinary conditions, such as
  • water
  • air
  • both a & b
  • oil
Answer: C
6.Who first derived the relation between the rate of shear strain rate and shear stress for such fluids in differential form.
  • Einstein
  • Mendel
  • Lehninger
  • Newton
Answer: D
7.There is general formula for friction force in a liquid: The vector differential of friction force is ………the viscosity tensor increased on vector product differential of the area vector of adjoining a liquid layers and rotor of velocity
  • Equal
  • Greater
  • Lesser
  • Constant
Answer: A
8.As are many commonly found substances such as ketchup, custard, toothpaste, starch suspensions, paint,blood, and shampoo are examples of
  • Non Newtonian fluid
  • Reynolds number
  • Newtonian fluid
  • Prantyl number
Answer: A
9.Biological fluids such as blood, saliva, semen, mucus and synovial fluids are
  • Newtonian fluid
  • Reynolds number
  • Non Newtonian fluid
  • Bingam Plastics
Answer: C
10.Blood is an opaque red fluid, freely flowing but denser and more viscous than
  • saliva
  • urine
  • water
  • faeces
Answer: C
11.Newtonian fluids are named after ……………., who first derived the relation between the rate of shear strain rate and shear stress for such fluids in differential form.
Answer: Isaac Newton
12.An element of a flowing liquid or gas will suffer forces from the surrounding fluid, including ……………… forces that cause it to gradually deform over time.
Answer: viscous stress
13.For an incompressible and isotropic Newtonian fluid, the viscous stress is related to the strain rate by the simpler equation …………………………
Answer:
14.Mucus, sputum, and synovial fluids are well known for their …………… behavior
Answer: Elastic
15.More generally, in a non-isotropic Newtonian fluid, the coefficient that relates internal friction stresses to the spatial derivatives of the velocity field is replaced by …………….
Answer: a nine-element viscosity tensor ij
16.Blood is an example of ………………..
Answer: Non Newtonian fluid
17.……………………. are examples clay suspensions, drilling mud, toothpaste, mayonnaise, chocolate, and mustard.
Answer: Bingham plastics
18.The characteristic colour of the blood is imparted by ……………………….
Answer: hemoglobin
19.The blood clot consists of microscopic strands of a complex protein, called ………….., forming a gel in which the erythrocytes and other cells are entrapped.
Answer: fibrin
20.The fluid portion, …………………….., is a clear, slightly sticky, yellowish liquid.
Answer: plasma