Pharmacy Practice MCQ, in this article we will solve, Practice MCQ under subject physical pharmaceutics II. Read following article for your reference.
Coarse Dispersion: Suspensions, Interfacial Properties, And Settling In Suspensions » PHARMACAREERS
- What is a coarse dispersion?
- a) A homogeneous mixture
- b) A dispersion with large particles typically greater than 1 micron
- c) A solution with particles smaller than 1 nanometer
- d) A mixture of gases
- Which of the following is an example of a coarse dispersion?
- a) Saltwater
- b) Milk
- c) Muddy water
- d) Vinegar
- What defines a suspension in pharmaceutical formulations?
- a) A mixture of liquids only
- b) Solid particles dispersed in a liquid medium
- c) Gaseous particles in a liquid medium
- d) Liquid particles in a gaseous medium
- What is the continuous phase in a suspension?
- a) The solid particles dispersed within the liquid
- b) The liquid in which solid particles are dispersed
- c) The gaseous phase surrounding the suspension
- d) The medium that evaporates
- What is the dispersed phase in a suspension?
- a) The solvent in which the solute is dissolved
- b) The solid particles dispersed within the liquid medium
- c) The liquid particles in a gaseous medium
- d) The medium that evaporates
- Which of the following factors can influence the stability of a suspension?
- a) Particle size
- b) Viscosity of the medium
- c) Density difference between dispersed phase and continuous phase
- d) All of the above
- What is the main cause of sedimentation in suspensions?
- a) Thermal agitation
- b) Gravitational force
- c) Magnetic force
- d) Electric force
- What is meant by ‘interfacial properties’ in the context of suspensions?
- a) Properties of the interface between dispersed particles and the continuous phase
- b) Properties of the liquid phase only
- c) Properties of the solid phase only
- d) Properties of the gaseous phase only
- Which factor is NOT typically considered an interfacial property?
- a) Surface tension
- b) Interfacial tension
- c) Viscosity
- d) Contact angle
- What is the effect of increasing particle size on the rate of sedimentation?
- a) Decreases the rate of sedimentation
- b) Increases the rate of sedimentation
- c) Has no effect on the rate of sedimentation
- d) Completely stops sedimentation
- Which method is commonly used to reduce the rate of sedimentation in suspensions?
- a) Increasing the particle size
- b) Decreasing the particle size
- c) Adding a thickening agent
- d) Adding a solvent
- What role do stabilizing agents play in suspensions?
- a) They increase the viscosity of the suspension
- b) They enhance the solubility of the particles
- c) They prevent the aggregation and sedimentation of particles
- d) They reduce the density of the particles
- What is the DLVO theory in the context of colloidal stability?
- a) Theory explaining the role of Van der Waals forces and electrostatic repulsion in particle stability
- b) Theory explaining the sedimentation process
- c) Theory related to the dissolution of particles
- d) Theory explaining the color change in suspensions
- Which property is important for the formulation of a stable suspension?
- a) High solubility of particles
- b) Low density of particles
- c) Optimal particle size
- d) High electrical conductivity
- What does the term ‘flocculation’ mean in the context of suspensions?
- a) The complete dissolution of particles
- b) The aggregation of particles into loose clusters
- c) The dispersion of particles
- d) The reduction in particle size
- What is the role of surfactants in suspensions?
- a) To reduce interfacial tension between particles and the liquid medium
- b) To increase particle size
- c) To enhance the solubility of particles
- d) To decrease the viscosity of the suspension
- What is the effect of high surface energy on the stability of colloidal particles?
- a) It enhances the stability of the particles
- b) It causes particles to aggregate and reduces stability
- c) It has no effect on the stability
- d) It decreases the solubility of the particles
- How does zeta potential influence the stability of suspensions?
- a) High zeta potential enhances stability by preventing particle aggregation
- b) High zeta potential reduces stability by promoting particle aggregation
- c) Zeta potential has no effect on stability
- d) Zeta potential influences only the color of the suspension
- Which of the following is a method to measure particle size in suspensions?
- a) Spectrophotometry
- b) Dynamic light scattering (DLS)
- c) Microscopy
- d) All of the above
- What is Ostwald ripening in suspensions?
- a) The growth of larger particles at the expense of smaller ones
- b) The dissolution of particles
- c) The reduction in particle size
- d) The stabilization of particles
- What is the purpose of adding thickeners to suspensions?
- a) To reduce the density of the suspension
- b) To increase the viscosity and reduce the rate of sedimentation
- c) To enhance the solubility of the particles
- d) To improve the color of the suspension
- Which of the following can be used as a thickening agent in suspensions?
- a) Carboxymethyl cellulose (CMC)
- b) Sodium chloride
- c) Ethanol
- d) Glycerin
- What is the role of viscosity in the stability of suspensions?
- a) Low viscosity enhances stability by reducing sedimentation
- b) High viscosity enhances stability by reducing sedimentation
- c) Viscosity has no effect on stability
- d) Viscosity affects only the color of the suspension
- Which type of interaction is critical for the stability of lyophobic colloids?
- a) Van der Waals forces
- b) Electrostatic repulsion
- c) Hydrogen bonding
- d) Covalent bonding
- What is the effect of pH on the stability of suspensions?
- a) pH has no effect on stability
- b) pH can influence the surface charge of particles, affecting stability
- c) pH changes only the color of the suspension
- d) pH affects only the viscosity of the suspension
- Which of the following is an example of a stabilizing agent for suspensions?
- a) Sodium lauryl sulfate
- b) Glucose
- c) Water
- d) Ethanol
- What is meant by ‘coalescence’ in the context of suspensions?
- a) The merging of smaller particles to form larger ones
- b) The breaking up of larger particles into smaller ones
- c) The complete dissolution of particles
- d) The dispersion of particles
- What is the primary mechanism by which sedimentation can be reduced in suspensions?
- a) Increasing particle size
- b) Reducing the density difference between dispersed and continuous phases
- c) Increasing the temperature of the suspension
- d) Adding a solvent
- What is the effect of temperature on the viscosity of suspensions?
- a) Temperature has no effect
- b) Higher temperatures generally decrease viscosity
- c) Higher temperatures increase viscosity
- d) The effect varies depending on the particles
- What does the term ‘deflocculation’ mean in the context of suspensions?
- a) The dispersion of aggregated particles
- b) The aggregation of particles
- c) The reduction in particle size
- d) The increase in particle size
For more regular updates you can visit our social media accounts,
Instagram: Follow us
Facebook: Follow us
WhatsApp: Join us
Telegram: Join us