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