PHYSICAL PHARMACY RHEOLOGY MCQs for GPAT, NIPER & ALL OTHER PARAMEDICAL EXAMS for more update, you will subscribe to our youtube channel:-https://www.youtube.com/channel/UCI6HAq-shADbF15z2NnVSCg Instagram:- https://www.instagram.com/pharmacyformulae/

2. 1. Shear rate of thixotropic material is
increased in a constant manner from point
‘a’ to point ‘b’ & is then decreased at the
same rate back to ‘e’
a) inappropriate equipment
b) Viscosity does not change with increasing
c) What results in hysteresis loop ‘a, b, e'
d) Pseudoplastic substances begin flow
ANSWER
d) Pseudoplastic substances begin flow

3. 2. Which of the following statement is
correct?
a) Dilatant materials may:-under conditions of high shear
b) In a Plastic system:- Viscosity decreases with increasing
shear rate
c) In a Pseudoplastic system:- Viscosity decreases with
increasing shear rate
d) In a Plastic system: materials are :-below the yield value
ANSWER
b) In a Plastic system:- Viscosity decreases with increasing
shear rate

4. 3. Rate of flow is directly proportional to
the applied stress
a) Stock's law
b) Newton’s law of flow
c) Hook's law
d) Empirical power law
ANSWER
b) Newton’s law of flow

5. 4. Fluidity is the reciprocal of
a) Thixotropy
b) Newtonian flow
c) Viscosity
d) Dilatant flow
ANSWER
c) Viscosity

6. 5. ____ is the science of flow and deformation of
matter. Particularly gels and non-Newtonian
fluids, which exhibit complex flow behavior, are
frequently encountered in pharmaceutical
engineering and manufacturing, or when dealing
with various in vivo fluids.
a) Hysteresis loop
b) Viscosity
c) Dilatant flow
d) Rheology
ANSWER
b) Rheology

7. 6. Bingham bodies- substances that
exhibit a yield value
a) If thixotropic gel is sheared, these weak bonds are
b) Most pharmaceutical fluids follow this because the fluid
viscosity varies with the shear rate
c) Difference between thixotropic & non-thixotropic
suspension is
d) Substances that undergo plastic flow are called
ANSWER
d) Substances that undergo plastic flow are called

8. 7. Shear thickening
a) Plastic flow does not begin until shearing stress exceeds
the
b) Viscosity does not change with increasing
c) Dilatant flow is opposite of
d) Dilatant flow is known as
ANSWER
d) Dilatant flow is known as

9. 8. Materials whose consistency depends on
the duration of shear as well as on the
rate of shear, exhibit
a) Rheoperxy
b) Viscoelasticity
c) Plasticity
d) Thixotropy
ANSWER
d) Thixotropy

10. 9. Up- down curve of thixotropic system
a) Hysteresis loop
b) Thixotropy
c) Dilatant flow
d) Non-newtonian flow
ANSWER
a) Hysteresis loop

11. 10. Poise
a) Unit of viscosity
b) It indicates yield value F
c) Fluidity is the reciprocal of -----
d) Unit of solubility
ANSWER
a) Unit of viscosity

12. 11. If neither the deforming strain nor its
derivative with time (rate) follows the
applied strain then the material is:
a) Viscoelastic
b) Elastic
c) Fluid
d) Solid
ANSWER
a) Viscoelastic

13. 12. ___ is the resistance of a fluid to flow.
a) Viscosity
b) Thixotropy
c) Plastic
d) Rheology
ANSWER
a) Viscocity

14. 13. ___absorption rate of drugs from the
GI tract
a) Inappropriate equipment results in
b) Is thixotropic gel is sheared these weak bonds are
c) Viscosity does not change with increasing
d) Viscosity has been show to effect
ANSWER
d) Viscosity has been show to effect

15. 14.Which property measures the resistance
of a liquid to flow
a) Density
b) Solubility
c) Viscosity
d) Volume
ANSWER
b) Solubility

16. 15. Elastic deformation is described by
a) Newton's law
b) Hook's law
c) Empirical power law
d) Stock's law
ANSWER
b) Hook’s law

17. 16. Fluid that do not obeys Newtons law
are described as
a) time dependent non-Newtonian fluids
b) time independent non-Newtonian fluids
c) Newtonian fluids
d) A and B Both
ANSWER
d) Both A & B

18. 17. The ratio of relaxation time of the
material to the time scale of
deformation is called
a) Weissenberg number
b) Mass number
c) Reynolds number
d) Deborah number
ANSWER
d) Deborah number

19. 18. Non-Newtonian flow ex. Emulsions,
suspensions, ointments
a) Rheology of a particular product can range in consistency from
fluid to semisolid to solid can affect
b) In plastic flow, when there is flocculation present, a yield exists
because
c) Difference in viscosity between two planes of liquid separated
by a distance is known as
d) Most pharmaceutical fluids follows this because the fluid
viscosity varies with the shear rate
ANSWER
d) Most pharmaceutical fluids follows this because the
fluid viscosity varies with the shear rate

20. 19. Tragacanth, sodium alginate, sodium
CMC, PVP
a) Examples of pseudoplastic flow
b) Examples of simple flow
c) Examples of dilatant flow
d) Examples of plastic flow
ANSWER
c) Examples of dilatant flow

21. 20. Dilatant flow is opposite of
a) Plastic flow
b) Pseudoplastic flow
c) Thixotropy
d) Dilatant flow
ANSWER
b) Pseudoplastic flow

22. 21. The principle method for measuring
velocity is
a) Capillary viscometer
b) Concentric cylinder viscometer
c) Falling or Rolling sphere viscometer
d) All of the above
ANSWER
d) All of the above