1. In psedoplastic flow as shear stress increases, shear rate...............
Correct : C. Increases but not linear
2. Dilatant materials are frequently called as...............
Correct : B. shear-thickening systems
3. The Rheogram of thixotropic material determined by...................
Correct : C. Both of the above
4. ....... is the isothermal and moderately slow recovery on standing of material of which stability lost owing to shearing.
Correct : D. Thixotropy
5. ......is the alteration in the shape and the size of a body owing to applied external forces and internal
forces.
Correct : A. Deformation
6. A wetting agent is included in the formulation of a suspension, particularly when the suspended
particles:
Correct : A. are hydrophobic
7. For a flocculated suspension, one of the following criterion is satisfied or established
Correct : C. weak inter-particle attractions
8. In stokes’ relationship, a parameter that greatly changes the velocity of settling is:
Correct : C. radius of the particle
9. The protamine-zinc insulin suspension is prepared by a method viz.,:
Correct : A. altered pH precipitation
10. Methyl cellulose is a polymer, which is of a type:
Correct : D. non-ionic
11. For a flocculated suspension the degree of flocculation is observed to be one. The sedimentation
volume is also 1 (one). These values, respectively, indicate the limits:
Correct : B. lower and upper
12. For an ideal suspension, the sedimentation volume should be:
Correct : A. equal to one
13. In case of suspensions, all statements below are true EXCEPT that:
Correct : B. it does not include a preservative
14. In practice, an acceptable suspension should have particles:
Correct : B. which can be readily re-dispersible after they settle
15. For oral administration of a suspension to a patient, which one of the factors is the most important?
Correct : A. acceptable color and odour
16. Which one of the following properties is applicable to suspensions?
Correct : C. rapid rate of sedimentation
17. Suspended particles become flocculated in a suspension, because:
Correct : A. attractive forces between particles are appreciable
18. Structured vehicle is included in the formulation of a suspension, in order to:
Correct : A. decrease the interfacial tension
19. In the preparation of a structured vehicle, which one of the following substances is used?
Correct : D. methyl cellulose
20. Which type of colloidal material is used commonly in the preparation of a structured vehicle?
Correct : B. hydrophilic
21. When charcoal powder is dusted on the surface of water, the contact angle (in degrees) that the
charcoal exhibits is:
Correct : D. 180
22. A maximum sedimentation volume will be obtained when zeta potential is:
Correct : D. zero
23. A substance is dissolved in water. The suspension has exhibited a negative apparent zeta potential.
Identify the related substance.
Correct : D. sulfaguanidine
24. Calcium hydrogen phosphate is dissolved in water. The apparent zeta potential initially is:
Correct : A. negative
25. Which one of these preparations is NOT qualified as a suspension.
Correct : D. vitamin B complex tonic as nutritional supplement
26. The ratio of the ultimate volume of sediment to the actual volume of sediment before settling is called
Correct : A. Sedimentation volume
27. The ratio of the sedimentation volume in case of flocculated suspension to the sedimentation volume
in case of deflocculated suspension is called
Correct : B. Degree of flocculation
28. The size of dispersed particles in coarse dispersion ranges from
Correct : A. 1 µm to 100 µm.
29. Which of the following are the desired features of good suspension:
Correct : D. All of the above
30. In flocculated suspension, the rate of sedimentation is
Correct : B. More
31. If zeta potential of a suspension is high, then the system will be considered as
Correct : A. Deflocculation
32. Which of the following is/are the properties of flocculated suspension?
Correct : D. All of the above
33. The value of sedimentation volume (F) gives a knowledge about the____________of the suspension
Correct : A. physical stability
34. Suspension is example of
Correct : A. Biphasic liquid dosage form
35. Acetates and Citrates are
Correct : A. Buffering agent
36. In an emulsion, the velocity of sedimentation is found to be negative. It means that the creaming is:
Correct : D. in upward direction
37. The density of the dispersed phase is more than that of the dispersion medium. According to the
Stokes' equation, the creaming is:
Correct : C. in downward direction
38. When oil and water are triturated together, the interfacial free energy was observed to be increased.
What does it indicate?:
Correct : B. decrease in the stability
39. For a stable emulsion, the phase volume ratio is generally about:
Correct : B. 52/48
40. The HLB range of an emulsifier employed in the preparation of water-in-oil emulsion is:
Correct : A. 3 to 6
41. In case of emulsions, the viscosity immediately after preparation and during storage, respectively, will
be:
Correct : C. lower and gradually decrease
42. The distribution of globules is not uniform in an emulsion. This stage is termed as:
Correct : D. creaming
43. An o/w microemulsion is prepared using a hydrophilic surfactant. The appearance of the
microemulsion is:
Correct : A. intense white
44. Emulsions are defined as thermodynamically unstable systems. The events that follow sequentially
towards instability are:
Correct : D. flocculation, creaming, coalescence and breaking
45. In the stability of emulsion, which instability step is prevented by emulsifiers?:
Correct : B. coalescence
46. An ‘emulsion within emulsion’ is designated as:
Correct : D. w/o/w
47. The main function of an emulsifier in the preparation of an emulsion is to:
Correct : A. develop a condensed membrane layer film
48. An emulsifier can be regarded as superior, if its mechanism of action is based on the principle of:
Correct : B. forming monomolecular adsorption film
49. An emulsifier is considered to be ideal, if it is soluble in:
Correct : C. both aqueous and oil phase
50. On commercial scale, emulsions are prepared by::
Correct : D. homogenization
51. Microemulsion is NOT considered to be a true emulsion, because:
Correct : C. immiscible phase is absent
52. A variety of factors would influence the rate of creaming in an emulsion.
The factor open to formulation pharmacist is to regulate:
Correct : C. globule size
53. Normally preservatives are added to an emulsion. One of the following statements is true.
Correct : C. preservatives remain in the aqueous phase
54. For the formulation of w/o emulsion, the coalescence rate of:
Correct : C. o/w is greater than w/o coalescence rate
55. Auxiliary emulsifying agents are used to stabilize the emulsion. They act on the principle:
Correct : D. thickening the continuous phase
56. Emulsion have a ......... shelf life
Correct : A. short
57. Creaming is a.......... process
Correct : A. reversible
58. O/W emulsions normally cream .........
Correct : B. upward
59. Microemulsions contain globules of the size about .........
Correct : D. 0.01 micrometer
60. Downward creaming means ........ rate of sedimentation
Correct : A. negative
61. A mixture of span 20 and tween 20 forms....... type of emulsion
Correct : A. W/O
62. Density of oily phase increased by addition of .......
Correct : C. water
63. Near CMC, micelles of the surfactant molecules assume the shape of
Correct : A. spherical
64. Which one of the following emulsifier is used to stabilise the emulsion of W/O type
Correct : B. Span 20
65. Creaming in emulsion can be controlled by regulating
Correct : C. globule size
66. An emulsifier is considered to be ideal, if it is soluble in
Correct : C. A & B
67. In the stability of emulsion, which important instability step should be prevented?
Correct : B. Coalescence
68. Emulsions made with tweens are
Correct : B. O/W
69. The HLB system is used classify
Correct : C. Surfactants
70. Emulsion containing more than two phases are called as
Correct : B. Multiple emulsion
71. Emulsion is
Correct : D. B & C
72. Which of the following is/ are the theories of emulsification?
Correct : D. All of the above
73. Which of the following is not the cause of Instability in emulsion
Correct : D. Mottling
74. Which of the following is a reversible phenomenon
Correct : A. Creaming
75. The phase inversion occur due to
Correct : C. Both a and b
76. Which of the following is used as antioxidants for emulsified systems
Correct : D. All of the above
77. Which of the following is identification test for emulsion
Correct : D. All of the above
78. When an emulsion is exposed to ultra-violet radiations. If the continuous fluorescence is observed
under microscope, then it is_____________ type emulsion.
Correct : A. w/o
79. Dry Gum Method is also known as
Correct : A. Continental method.
80. In Dry gum method, 4:2:1 consist of
Correct : A. 4 parts oil, 2 parts water, and 1 part emulsifier
81. The rheological property of emulsion can be controlled by
Correct : D. All of the above
82. The suspensions having particle size................... are categorized as coarse suspension.
Correct : A. Greater than ~1 mm
83. ............ exists when dispersed solid particles in a suspension retain change in relation their adjoining
liquid medium.
Correct : B. Surface potential
84. The equal distribution of all the ions in solution retain by……
Correct : C. Both of the above
85. The flocculated suspension is one in which zeta potential of particle is…… .
Correct : C. -20 to+20 mV
86. ...... determines the movement of charged particles via a liquid under the impact of an
applied potential difference.
Correct : A. Electrophoresis
87. ..........is produced by forcing a liquid to course through a stationary solid phase.
Correct : D. The streaming potential
88. The flocculated suspensions sediment.............
90. Structured vehicles are also termed as or..............
Correct : C. Both of the above
91. ....... is the concentration of globules at the top or bottom of the emulsion.
Correct : A. Creaming
92. Which of the following properties of a particle significantly affects the physical, chemical and
biological properties of the drug?
Correct : D. surface area
93. It is difficult to express the size of particles in a meaningful diameter.
Correct : A. irregular in shape
94. The type of a particle diameter obtained largely depends on:
Correct : A. method by which it is determined
95. When cumulative percent frequency on a probability scale is plotted against logarithm of the particle
size, 50 percent on the probability scale gives the powder particle diameter of:
Correct : C. geometric mean
96. Which one of these distributions is more important in the design of dosage forms?
Correct : D. weight
97. In the formulation development of emulsions and suspensions, what type of diameter is important?
Correct : D. stokes
98. Sieving method is used for size distribution analysis of powder. The disadvantage of this method is:
Correct : B. attrition of powder is possible
99. While using sedimentation method for size analysis, addition of a deflocculating agent to a suspension
is necessary in order to:
Correct : C. prevent the aggregation
100. Stokes’ law cannot be used, if Reynolds number is more than: