NURSING ANM AND GNM

NURSING EXAM QUESTIONS

PHARMACEUTICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
At equilibrium the thixotropic behavior of a pseudoplastic system exhibit the state of
A
Gel
B
Paste
C
Sol
D
Wax
Explanation: 

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.

There is 1 question to complete.