Pharmacy Practice MCQ, in this article we will solve, Practice MCQ under subject physical pharmaceutics II. Read following article for your reference.
https://www.pharmacareers.in/ulation-of-flocculated-and-deflocculated-suspensions/
- What is a flocculated suspension?
- a) A suspension where particles loose aggregates
- b) A suspension where particles remain separate and discrete
- c) A solution with dissolved particles
- d) A suspension with no sedimentation
- What is a deflocculated suspension?
- a) A suspension where particles loose aggregates
- b) A suspension where particles remain separate and discrete
- c) A suspension with large particle clusters
- d) A suspension with no sedimentation
- What is the primary characteristic of flocculated suspensions?
- a) Particles settle rapidly and a loose, easily redispersed sediment
- b) Particles settle slowly and a compact sediment
- c) Particles dissolve completely in the medium
- d) Particles float on the surface of the medium
- What is the main disadvantage of deflocculated suspensions?
- a) Rapid settling and easy redispersion
- b) Slow settling and ation of a hard cake that is difficult to redisperse
- c) Formation of large aggregates
- d) Complete dissolution of particles
- Which type of agent is used to promote flocculation in suspensions?
- a) Dispersing agents
- b) Flocculating agents
- c) Solubilizing agents
- d) Preservatives
- Which of the following is commonly used as a flocculating agent?
- a) Sodium chloride
- b) Sodium lauryl sulfate
- c) Bentonite
- d) Ethanol
- What is the role of electrolytes in flocculated suspensions?
- a) To increase the viscosity of the medium
- b) To reduce the electrical repulsion between particles and promote aggregation
- c) To enhance the solubility of particles
- d) To reduce the density of the suspension
- What is the effect of adding a deflocculant to a suspension?
- a) It promotes the aggregation of particles
- b) It keeps particles separate and prevents aggregation
- c) It increases the viscosity of the medium
- d) It reduces the solubility of particles
- Which of the following is a common deflocculating agent?
- a) Sodium alginate
- b) Sodium carboxymethyl cellulose
- c) Gelatin
- d) Polyethylene glycol
- What is the significance of zeta potential in 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 property of particles is essential for the ulation of a stable suspension?
- a) High density
- b) Low solubility
- c) Optimal particle size
- d) High electrical conductivity
- What is the primary effect of flocculating agents on particles in a suspension?
- a) They increase particle size
- b) They promote loose aggregation of particles
- c) They enhance the solubility of particles
- d) They reduce the viscosity of the suspension
- What is the role of polymers in the ulation of suspensions?
- a) To reduce particle size
- b) To stabilize suspensions by preventing particle aggregation
- c) To increase the density of the suspension
- d) To enhance the solubility of particles
- Which of the following is a commonly used polymer in suspension ulation?
- a) Polyvinyl alcohol
- b) Sodium chloride
- c) Ethanol
- d) Glycerin
- What is the primary disadvantage of a flocculated suspension?
- a) Formation of a hard cake
- b) Rapid settling and ease of redispersion
- c) Formation of large aggregates
- d) Complete dissolution of particles
- What is the effect of pH on the stability of flocculated 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
- What is the role of surfactants in the ulation of deflocculated suspensions?
- a) To reduce surface tension and prevent particle aggregation
- b) To increase particle size
- c) To enhance the solubility of particles
- d) To decrease the viscosity of the suspension
- Which method is commonly used to measure particle size in suspensions?
- a) Spectrophotometry
- b) Dynamic light scattering (DLS)
- c) Microscopy
- d) All of the above
- What is the purpose of adding thickeners to flocculated 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 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
- 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 deflocculated suspensions?
- a) Van der Waals forces
- b) Electrostatic repulsion
- c) Hydrogen bonding
- d) Covalent bonding
- What is the effect of pH on the stability of deflocculated 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 deflocculated suspensions?
- a) Sodium lauryl sulfate
- b) Glucose
- c) Water
- d) Ethanol
- What is the significance of measuring zeta potential in suspensions?
- a) It indicates the solubility of colloidal particles
- b) It measures the charge stability of colloidal particles
- c) It determines the size of colloidal particles
- d) It enhances the reactivity of colloidal particles
- What is the primary effect of high electrolyte concentration on suspensions?
- a) Enhanced stability of colloidal particles
- b) Increased aggregation and precipitation of colloidal particles
- c) Reduction in the size of colloidal particles
- d) Increased solubility of colloidal particles
- Which technique is used to study the kinetic properties of suspensions?
- a) Dynamic light scattering (DLS)
- b) Electrophoresis
- c) Spectrophotometry
- d) Chromatography
- What is the role of surfactants in colloidal systems?
- a) To reduce the surface tension and stabilize colloidal particles
- b) To increase the size of colloidal particles
- c) To dissolve colloidal particles
- d) To aggregate colloidal particles
- What is the primary cause of sedimentation in suspensions?
- a) Thermal agitation
- b) Gravitational force
- c) Magnetic force
- d) Electric force
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