Pharmacy Practice MCQ- Properties of Colloidal Dispersions

Pharmacy Practice MCQ, in this article we will solve, Practice MCQ under subject physical pharmaceutics II. Read following article for your reference.

 

Optical, Kinetic & Electrical Properties Of Colloidal Dispersion And Effect Of Electrolytes » PHARMACAREERS

 

  • What is the Tyndall effect?
    • a) The scattering of light by colloidal particles
    • b) The absorption of light by colloidal particles
    • c) The reflection of light by colloidal particles
    • d) The refraction of light by colloidal particles
  • Which property allows colloidal particles to remain dispersed in the continuous phase?
    • a) Large size
    • b) Brownian motion
    • c) High density
    • d) Low solubility
  • What is Brownian motion?
    • a) The random movement of colloidal particles due to collisions with solvent molecules
    • b) The sedimentation of colloidal particles
    • c) The aggregation of colloidal particles
    • d) The dissolution of colloidal particles
  • What is the significance of surface charge on colloidal particles?
    • a) It enhances the solubility of colloidal particles
    • b) It stabilizes the colloidal dispersion by preventing aggregation
    • c) It reduces the reactivity of colloidal particles
    • d) It increases the size of colloidal particles
  • Which technique is commonly used to determine the size of colloidal particles?
    • a) Spectrophotometry
    • b) Dynamic light scattering (DLS)
    • c) Microscopy
    • d) Chromatography
  • What is the principle behind dynamic light scattering (DLS)?
    • a) Measurement of light absorption by colloidal particles
    • b) Measurement of light scattering by colloidal particles in suspension
    • c) Measurement of light reflection by colloidal particles
    • d) Measurement of light refraction by colloidal particles
  • Which property of colloids is responsible for their stability in a suspension?
    • a) High density
    • b) Low solubility
    • c) Electrostatic repulsion
    • d) Large particle size
  • What is electrophoresis?
    • a) The movement of colloidal particles under the influence of an electric field
    • b) The aggregation of colloidal particles
    • c) The dissolution of colloidal particles
    • d) The precipitation of colloidal particles
  • What is the zeta potential?
    • a) The potential difference between the dispersion medium and the stationary layer of fluid attached to the dispersed particle
    • b) The potential difference between two colloidal particles
    • c) The potential energy of colloidal particles
    • d) The thermal energy of colloidal particles
  • What is the main effect of adding electrolytes to a colloidal dispersion?
    • a) Increasing the size of colloidal particles
    • b) Reducing the stability of the colloidal dispersion
    • c) Enhancing the solubility of colloidal particles
    • d) Increasing the viscosity of the dispersion
  • What happens to colloidal particles during coagulation?
    • a) They become more dispersed
    • b) They aggregate and settle out of the dispersion
    • c) They become smaller
    • d) They dissolve completely
  • Which type of light scattering is primarily used to study colloidal dispersions?
    • a) Rayleigh scattering
    • b) Mie scattering
    • c) Raman scattering
    • d) Compton scattering
  • How does temperature affect Brownian motion in colloidal dispersions?
    • a) Higher temperatures increase the Brownian motion
    • b) Higher temperatures decrease the Brownian motion
    • c) Temperature has no effect on Brownian motion
    • d) Brownian motion ceases at high temperatures
  • What is the primary cause of the Tyndall effect in colloidal dispersions?
    • a) Absorption of light by colloidal particles
    • b) Scattering of light by colloidal particles
    • c) Reflection of light by colloidal particles
    • d) Refraction of light by colloidal particles
  • What is sedimentation in the context of colloidal dispersions?
    • a) The dispersion of colloidal particles
    • b) The movement and settling of colloidal particles under gravity
    • c) The dissolution of colloidal particles
    • d) The stabilization of colloidal particles
  • What is the electrokinetic potential?
    • a) The potential energy of colloidal particles
    • b) The movement of colloidal particles under an electric field
    • c) The potential difference between the dispersed phase and the continuous phase
    • d) The thermal energy of colloidal particles
  • What is flocculation?
    • a) The formation of loose aggregates of colloidal particles
    • b) The complete dissolution of colloidal particles
    • c) The separation of colloidal particles from the dispersion medium
    • d) The stabilization of colloidal particles
  • What is the primary effect of adding a coagulant to a colloidal dispersion?
    • a) To increase the dispersion of colloidal particles
    • b) To reduce the solubility of colloidal particles
    • c) To neutralize the surface charge of colloidal particles and promote aggregation
    • d) To enhance the stability of colloidal particles
  • Which property allows colloidal particles to exhibit elasticity?
    • a) High density
    • b) Surface charge
    • c) Electrostatic repulsion
    • d) Large particle size
  • What is the role of stabilizing agents in colloidal dispersions?
    • a) To increase the size of colloidal particles
    • b) To prevent aggregation and precipitation of colloidal particles
    • c) To enhance the solubility of colloidal particles
    • d) To reduce the viscosity of the dispersion
  • Which of the following is an example of a kinetic property of colloidal dispersions?
    • a) Tyndall effect
    • b) Brownian motion
    • c) Zeta potential
    • d) Electrophoresis
  • What is the primary use of light scattering techniques in colloidal studies?
    • a) To measure the density of colloidal particles
    • b) To determine the size and distribution of colloidal particles
    • c) To assess the chemical composition of colloidal particles
    • d) To evaluate the color of colloidal particles
  • What is the effect of electrolytes on the stability of lyophobic colloids?
    • a) Electrolytes enhance the stability of lyophobic colloids
    • b) Electrolytes reduce the stability of lyophobic colloids
    • c) Electrolytes have no effect on lyophobic colloids
    • d) Electrolytes dissolve lyophobic colloids
  • What is the primary characteristic of colloidal particles in gels?
    • a) They are dispersed in a liquid medium
    • b) They form a semi-solid network structure
    • c) They are highly reactive
    • d) They are completely dissolved
  • What is the significance of measuring zeta potential in colloidal dispersions?
    • 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 colloidal dispersions?
    • 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 colloidal particles?
    • 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
  • Which property of colloidal particles helps in preventing sedimentation?
    • a) High density
    • b) Brownian motion
    • c) High solubility
    • d) Large particle size
  • What is the significance of measuring electrophoretic mobility in colloidal dispersions?
    • a) It indicates the solubility of colloidal particles
    • b) It measures the charge and stability of colloidal particles
    • c) It determines the size of colloidal particles
    • d) It enhances the reactivity of colloidal particles

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