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PCEUT 531 (ACTUAL 2025/2026) EXAM 1 QUESTIONS
WITH VERIFIED CORRECT ANSWERS
In principle, if cohesive force is greater than adhesive force, dispersed systems
tend to mix - (answer)False
For an aqueous surfactant solution, surface tension of the solution will not change
much at surfactant concentrations above its CMC - (answer)True
In case of hydrophilic surfactants in water, at concentrations above CMC the
hydrocarbon chains of the surfactants face inwards into the micelle to form, in
effect, their own hydrophobic environment - (answer)True
In general, emulsions and suspensions belong to colloidal dispersion -
(answer)False
Emulsions consist of at least two immiscible liquid phases, one of which is
dispersed as globules in the other liquid phase - (answer)True
Finely divided ZnO powder can be used as an emulsifying agent because it
reduced interfacial tension. - (answer)False
One of the functions of surfactants as emulsifying agents in emulsions is to
provide a coherent monolayer that helps prevent coalescence between two
droplets as they approach one another - (answer)True
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In general, within a relatively short period of time (ie. several hours) after
preparation, it is observed that the flocs of flocculated suspensions tend to fall
rapidly, producing a distinct boundary between the sediment and the supernatant
liquid - (answer)True
Electrolytes can act as flocculating agents in pharmaceutical suspensions by
reducing the electric barrier between the solid drug particles - (answer)True
Enteric coated aspirin rather than film coated Bayer aspirin should be
administered by mouth to Betty Boop who is in the emergency room with a
suspected myocardial infarction (heart attack) - (answer)False
Orally Disintegrating Tablets (ODT) are subtypes of enteric coated tablets -
(answer)False
Excipients are, in general, considered as part of the inactive ingredients of a
capsule or a tablet - (answer)True
In Dry Gum or Continental method, the oil is added first to the water -
(answer)True
White wax is used in rose water ointment to give texture to the ointment -
(answer)False
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Ophthalmic hypertonic solution such as Sodium Chloride 5% is used to treat
edema of the cornea - (answer)True
All transdermal patches can be cut without loss of therapeutic drug effect -
(answer)False
An emulsifying agent, by its presence in emulsions, prevents coalescence and
maintains the integrity of the individual droplets - (answer)True
Adding structured vehicles such as acacia and tragacanth can reduce the
sedimentation rate of particles in flocculated suspensions - (answer)True
Zinc Oxide acts as an emulsifying agent in Calamine liniment by reducing
interfacial tension - (answer)False
Adding flocculating agents may enhance particle "dispersability" in suspensions -
(answer)True
In general, deflocculated pharmaceutical suspensions are preferred because
particles settle slowly - (answer)False
Bella is asked to prepare an emulsion for Edward, in which water is the external
phase. This type of emulsion is classified as W/O emulsion - (answer)False
PCEUT 531 (ACTUAL 2025/2026) EXAM 1 QUESTIONS
WITH VERIFIED CORRECT ANSWERS
In principle, if cohesive force is greater than adhesive force, dispersed systems
tend to mix - (answer)False
For an aqueous surfactant solution, surface tension of the solution will not change
much at surfactant concentrations above its CMC - (answer)True
In case of hydrophilic surfactants in water, at concentrations above CMC the
hydrocarbon chains of the surfactants face inwards into the micelle to form, in
effect, their own hydrophobic environment - (answer)True
In general, emulsions and suspensions belong to colloidal dispersion -
(answer)False
Emulsions consist of at least two immiscible liquid phases, one of which is
dispersed as globules in the other liquid phase - (answer)True
Finely divided ZnO powder can be used as an emulsifying agent because it
reduced interfacial tension. - (answer)False
One of the functions of surfactants as emulsifying agents in emulsions is to
provide a coherent monolayer that helps prevent coalescence between two
droplets as they approach one another - (answer)True
,2|Page
In general, within a relatively short period of time (ie. several hours) after
preparation, it is observed that the flocs of flocculated suspensions tend to fall
rapidly, producing a distinct boundary between the sediment and the supernatant
liquid - (answer)True
Electrolytes can act as flocculating agents in pharmaceutical suspensions by
reducing the electric barrier between the solid drug particles - (answer)True
Enteric coated aspirin rather than film coated Bayer aspirin should be
administered by mouth to Betty Boop who is in the emergency room with a
suspected myocardial infarction (heart attack) - (answer)False
Orally Disintegrating Tablets (ODT) are subtypes of enteric coated tablets -
(answer)False
Excipients are, in general, considered as part of the inactive ingredients of a
capsule or a tablet - (answer)True
In Dry Gum or Continental method, the oil is added first to the water -
(answer)True
White wax is used in rose water ointment to give texture to the ointment -
(answer)False
, 3|Page
Ophthalmic hypertonic solution such as Sodium Chloride 5% is used to treat
edema of the cornea - (answer)True
All transdermal patches can be cut without loss of therapeutic drug effect -
(answer)False
An emulsifying agent, by its presence in emulsions, prevents coalescence and
maintains the integrity of the individual droplets - (answer)True
Adding structured vehicles such as acacia and tragacanth can reduce the
sedimentation rate of particles in flocculated suspensions - (answer)True
Zinc Oxide acts as an emulsifying agent in Calamine liniment by reducing
interfacial tension - (answer)False
Adding flocculating agents may enhance particle "dispersability" in suspensions -
(answer)True
In general, deflocculated pharmaceutical suspensions are preferred because
particles settle slowly - (answer)False
Bella is asked to prepare an emulsion for Edward, in which water is the external
phase. This type of emulsion is classified as W/O emulsion - (answer)False
