NURSING EXAM QUESTIONS
PHARMACEUTICS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gel
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Paste
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Sol
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Wax
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Detailed explanation-1: -At equilibrium, the thixotropic behavior of a pseudoplastic system exhibit the state of Option (a) gel. Thixotropy is a shear-thinning property that changes with time. Shaken, agitated, or sheared gels or fluids will gradually become thinner and less viscous over time.
Detailed explanation-2: -Pseudoplastic flow is typically exhibited by polymers in solution in contrast to plastic systems, which are composed of flocculated particles in suspension. The consistency curve for a pseudoplastic material begins at the origin (or at least approaches it at low rates of shear). Therefore, there is no yield value.
Detailed explanation-3: -A thixotropic fluid is a fluid which takes a finite time to attain equilibrium viscosity when introduced to a steep change in shear rate. Some thixotropic fluids return to a gel state almost instantly, such as ketchup, and are called pseudoplastic fluids.