Pharmacy Practice MCQ, in this article we will solve, Practice MCQ under subject physical pharmaceutics II. Read following article for your reference.
- What is a colloidal dispersion?
- a) A homogeneous mixture of two or more substances
- b) A heterogeneous mixture with particles between 1 and 1000 nm dispersed in a continuous phase
- c) A solution with particles larger than 1000 nm
- d) A mixture where one substance dissolves completely in another
- Which of the following is an example of a colloidal dispersion?
- a) Saltwater
- b) Milk
- c) Sugar solution
- d) Pure water
- What is the dispersed phase in a colloidal system?
- a) The continuous medium in which particles are dispersed
- b) The particles dispersed within the continuous medium
- c) The solvent that dissolves the solute
- d) The medium that evaporates
- What is the continuous phase in a colloidal system?
- a) The solvent in which the solute is dissolved
- b) The medium in which colloidal particles are dispersed
- c) The solid particles in a solution
- d) The air surrounding the particles
- Which of the following is NOT a common classification of colloidal systems?
- a) Lyophobic colloids
- b) Lyophilic colloids
- c) Macromolecular colloids
- d) Homogeneous colloids
- What distinguishes lyophilic colloids from lyophobic colloids?
- a) Lyophilic colloids are solvent-loving, while lyophobic colloids are solvent-hating
- b) Lyophilic colloids are solvent-hating, while lyophobic colloids are solvent-loving
- c) Lyophilic colloids are homogeneous, while lyophobic colloids are heterogeneous
- d) Lyophilic colloids are larger in size compared to lyophobic colloids
- What is an example of a lyophilic colloid?
- a) Rubber in benzene
- b) Gold in water
- c) Milk
- d) Blood
- What is an example of a lyophobic colloid?
- a) Starch in water
- b) Gelatin in water
- c) Ferric hydroxide in water
- d) Soap solution
- Which of the following describes macromolecular colloids?
- a) Colloids formed by the dispersion of large molecules
- b) Colloids formed by the dispersion of small molecules
- c) Colloids that are solvent-hating
- d) Colloids that are solvent-loving
- What is the typical size range of colloidal particles?
- a) 0.1-1 nm
- b) 1-100 nm
- c) 1-1000 nm
- d) 1000-10000 nm
- Which of the following shapes can colloidal particles have?
- a) Spherical
- b) Rod-like
- c) Plate-like
- d) All of the above
- 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 of colloidal particles allows them 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 the 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
- What is the role of a stabilizing agent in colloidal dispersions?
- a) To increase the size of colloidal particles
- b) To prevent the aggregation and precipitation of colloidal particles
- c) To enhance the solubility of colloidal particles
- d) To reduce the density of colloidal particles
- Which method is commonly used to prepare lyophobic colloids?
- a) Dispersion method
- b) Condensation method
- c) Peptization
- d) Dialysis
- What is the principle of the condensation method for preparing colloids?
- a) Breaking down larger particles into colloidal size
- b) Aggregating smaller particles to form colloidal size
- c) Dissolving particles in a solvent
- d) Evaporating the solvent to concentrate colloidal particles
- What is peptization?
- a) The process of coagulating colloidal particles
- b) The process of dispersing colloidal particles
- c) The process of dissolving colloidal particles
- d) The process of stabilizing colloidal particles
- What is the purpose of dialysis in colloidal systems?
- a) To separate colloidal particles from ions or small molecules
- b) To aggregate colloidal particles
- c) To dissolve colloidal particles
- d) To enhance the reactivity of colloidal particles
- Which property is NOT typical of colloidal dispersions?
- a) High surface area to volume ratio
- b) Stability against sedimentation
- c) Large particle size
- d) Ability to scatter light
- What is the coagulation of colloidal particles?
- a) The dispersion of colloidal particles
- b) The aggregation and settling of colloidal particles
- c) The dissolution of colloidal particles
- d) The stabilization of colloidal particles
- Which agent can be used to coagulate a lyophobic colloid?
- a) Electrolytes
- b) Non-electrolytes
- c) Stabilizers
- d) Dispersing agents
- 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 significance of 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
- Which type of colloidal dispersion is characterized by a continuous phase of water and dispersed phase of oil?
- a) Sol
- b) Gel
- c) Emulsion
- d) Foam
- What is the characteristic feature 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
- Which of the following is a common application of colloidal dispersions in pharmaceuticals?
- a) Drug delivery systems
- b) Enhancing flavor
- c) Coloring agents
- d) Reducing production costs
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