Rheology in Pharmaceutical Sciences
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Questions and Answers

What is the term Rheology derived from?

  • Greek words meaning 'to flow' and 'science' (correct)
  • Latin and Greek words meaning 'to deform'
  • French words meaning 'to measure' and 'fluids'
  • English words meaning 'to study' and 'material'

    • Which type of deformation is reversible according to the text?

  • Elastic deformation (correct)
  • Plastic deformation
  • Permanent deformation
  • Irreversible deformation

    • What is the material response to a stress known as?

  • Plasticity
  • Elasticity
  • Rheology (correct)
  • Viscoelasticity

    • Shearing stress is applied in which manner to the surface of a body?

    <p>Tangentially (A)</p> Signup and view all the answers

    Which of the following is a concept related to rheology according to the text?

    <p>Viscosity (C)</p> Signup and view all the answers

    What type of stress is applied perpendicularly to the surface of a body?

    <p>Tensile stress (B)</p> Signup and view all the answers

    What is viscosity?

    <p>The ability of a liquid to resist flow (B)</p> Signup and view all the answers

    How does viscosity change with temperature?

    <p>Decreases with rise in temperature (D)</p> Signup and view all the answers

    What unit is used to measure viscosity in the C.G.S system?

    <p>Dyne-second/square centimeter (D)</p> Signup and view all the answers

    Why are ophthalmic preparations made viscous?

    <p>To prolong the contact time of the drugs (B)</p> Signup and view all the answers

    How are paints affected when made more viscous?

    <p>They remain in contact with skin for a long time (D)</p> Signup and view all the answers

    Why are certain pharmaceutical formulations standardized based on viscosity?

    <p>To maintain consistency and quality (A)</p> Signup and view all the answers

    What type of flow is typically exhibited by polymers in solution?

    <p>Pseudo-plastic flow (B)</p> Signup and view all the answers

    How is the consistency curve for a pseudo-plastic material represented?

    <p>It starts at the origin or approaches it at low shear rates. (D)</p> Signup and view all the answers

    What happens to the viscosity of a pseudo-plastic material as shear stress is increased?

    <p>It cannot be expressed by any single value. (C)</p> Signup and view all the answers

    What effect does shearing stress have on molecules in a pseudo-plastic material?

    <p>It aligns their long axes in the direction of flow. (A)</p> Signup and view all the answers

    Which of the following is NOT an application of materials exhibiting pseudo-plastic flow?

    <p>Concrete (C)</p> Signup and view all the answers

    What causes the curved Rheogram for pseudo-plastic materials?

    <p>Shearing action on long chain molecules (B)</p> Signup and view all the answers

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