Pharmacy Practice MCQ, in this article we will solve, Practice MCQ under subject physical pharmaceutics II. Read following article for your reference.
Emulsion And Theories Of Emulsification » PHARMACAREERS
- What is an emulsion?
- a) A homogeneous mixture of two miscible liquids
- b) A heterogeneous mixture of two immiscible liquids
- c) A solution of a solid in a liquid
- d) A mixture of gases
- Which type of emulsion has oil as the dispersed phase and water as the continuous phase?
- a) Water-in-oil (W/O) emulsion
- b) Oil-in-water (O/W) emulsion
- c) Multiple emulsion
- d) Microemulsion
- What is the primary role of an emulsifying agent in an emulsion?
- a) To increase the viscosity of the emulsion
- b) To reduce the interfacial tension between the two immiscible liquids
- c) To increase the density of the dispersed phase
- d) To enhance the solubility of the dispersed phase
- Which theory explains the reduction of interfacial tension by emulsifying agents?
- a) Surface tension theory
- b) Oriented wedge theory
- c) Interfacial film theory
- d) Gibbs adsorption rule
- What is the main advantage of microemulsions over conventional emulsions?
- a) Higher viscosity
- b) Improved bioavailability
- c) Increased density
- d) Enhanced color
- Which factor does NOT typically affect the stability of an emulsion?
- a) Droplet size
- b) Viscosity of the continuous phase
- c) Density of the dispersed phase
- d) Color of the emulsion
- What is creaming in the context of emulsions?
- a) The merging of droplets
- b) The upward movement of droplets due to density differences
- c) The settling of droplets to the bottom
- d) The formation of a hard cake
- Which type of emulsifier is typically used in oil-in-water (O/W) emulsions?
- a) Hydrophilic emulsifiers
- b) Hydrophobic emulsifiers
- c) Non-polar emulsifiers
- d) Ionic emulsifiers
- What is the primary cause of coalescence in emulsions?
- a) High viscosity
- b) Low interfacial tension
- c) High zeta potential
- d) Phase inversion
- Which method is commonly used to prepare emulsions?
- a) Filtration
- b) Centrifugation
- c) Trituration
- d) Distillation
- What is phase inversion in emulsions?
- a) The merging of droplets
- b) The settling of droplets to the bottom
- c) The reversal of the dispersed and continuous phases
- d) The formation of a hard cake
- Which theory describes emulsifying agents curving around droplets to fit their structure?
- a) Surface tension theory
- b) Oriented wedge theory
- c) Interfacial film theory
- d) Gibbs adsorption rule
- What is the role of thickening agents in emulsions?
- a) To reduce the density of the emulsion
- b) To increase the viscosity and reduce the rate of creaming
- c) To enhance the solubility of the dispersed phase
- d) To improve the color of the emulsion
- Which type of emulsion is characterized by droplets smaller than 100 nanometers?
- a) Multiple emulsion
- b) Microemulsion
- c) Water-in-oil (W/O) emulsion
- d) Oil-in-water (O/W) emulsion
- What is the primary disadvantage of multiple emulsions?
- a) High viscosity
- b) Low bioavailability
- c) Instability
- d) High density
- Which factor can influence the type of emulsion formed (O/W or W/O)?
- a) The ratio of phases
- b) The color of the emulsion
- c) The density of the dispersed phase
- d) The viscosity of the continuous phase
- What is the role of surfactants in emulsions?
- a) To increase the density of the dispersed phase
- b) To reduce the interfacial tension between the two immiscible liquids
- c) To enhance the solubility of the dispersed phase
- d) To increase the viscosity of the emulsion
- Which method is used to evaluate the stability of emulsions?
- a) Spectrophotometry
- b) Dynamic light scattering (DLS)
- c) Microscopy
- d) All of the above
- What is the effect of high surface energy on the stability of emulsions?
- a) It enhances the stability of the emulsion
- b) It causes droplets to aggregate and reduces stability
- c) It has no effect on the stability
- d) It decreases the solubility of the dispersed phase
- What is the role of zeta potential in the stability of emulsions?
- a) High zeta potential enhances stability by preventing droplet aggregation
- b) High zeta potential reduces stability by promoting droplet aggregation
- c) Zeta potential has no effect on stability
- d) Zeta potential influences only the color of the emulsion
- Which type of emulsion is used to deliver poorly soluble drugs?
- a) Water-in-oil (W/O) emulsion
- b) Oil-in-water (O/W) emulsion
- c) Multiple emulsion
- d) Microemulsion
- What is the primary mechanism by which emulsifying agents stabilize emulsions?
- a) Increasing the density of the dispersed phase
- b) Reducing the interfacial tension between the two immiscible liquids
- c) Enhancing the solubility of the dispersed phase
- d) Increasing the viscosity of two immiscible liquids
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