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Rheology and Viscosity of Liquids in Pharmacy

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Rheology and Viscosity of Liquids in Pharmacy

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Questions and Answers

What is the definition of rheology?

The study of the flow properties of fluids (liquids and semi-solids) (correct)

The study of the flow properties of plasma

The study of the flow properties of gases

The study of the flow properties of solids

What is deformation?

Change in size or dimension of an object or substance under stress (correct)

Change in chemical composition

Change in state from solid to liquid

Change in color

What is the definition of viscosity?

The ability of a solid to flow under stress

The speed at which a fluid flows

The ability of a gas to deform under stress

The ability of a fluid to resist flowing (correct)

What is the difference between reversible and irreversible deformation?

Reversible deformation is elastic, while irreversible deformation is plastic (D) Signup and view all the answers

What is the measure of resistance to flow of liquids at a given temperature under active stress?

Dynamic viscosity (A) Signup and view all the answers

In the centimetre-gram-second (cgs) system, what are the units of kinematic viscosity?

cm2s-1 (C) Signup and view all the answers

Which type of flow system is characterized by liquids whose flow characteristics are in consonance with Newton’s law of flow?

Newtonian (C) Signup and view all the answers

What is the ratio of the solution viscosity to solvent viscosity known as?

Relative viscosity (A) Signup and view all the answers

Whose law of flow states that for simple fluids, the rate of flow is directly proportional to the applied stress?

Isaac Newton (B) Signup and view all the answers

What is the measure of the ratio between dynamic viscosity and the density of fluid?

Kinematic viscosity (B) Signup and view all the answers