McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Pharmacy (B. Pharma) , Pharmacy .
Chapters
| 1. |
An example for colloidal systems is: |
| A. | clays and gels |
| B. | ointments and pastes |
| C. | solutions of soaps and proteins |
| D. | suspensions and emulsions |
| Answer» C. solutions of soaps and proteins | |
| 2. |
The criterion to call a system ‘colloid’ is |
| A. | a fine state of subdivision of dispersed phase |
| B. | dispersed particles are in the size range of 1 nm to 1 µm |
| C. | interface is very extensive |
| D. | the presence of dispersed phase in a dispersion medium |
| Answer» B. dispersed particles are in the size range of 1 nm to 1 µm | |
| 3. |
Solutions of proteins and starch in water are the examples of the colloidal type: |
| A. | hydrophilic |
| B. | hydrophobic |
| C. | lyophilic |
| D. | lyophobic |
| Answer» A. hydrophilic | |
| 4. |
Electrodialysis method is employed in the colloidal chemistry for the purpose of : |
| A. | Indentification |
| B. | preparation |
| C. | Purification |
| D. | Stabilization |
| Answer» C. Purification | |
| 5. |
Silica gel is an example for the type of gel: |
| A. | dilatants |
| B. | elastic |
| C. | rigid |
| D. | thixotropic |
| Answer» C. rigid | |
| 6. |
Which of the following DO NOT form colloid spontaneously? |
| A. | association |
| B. | lyophilic |
| C. | lyophobic |
| D. | micellar |
| Answer» C. lyophobic | |
| 7. |
Sulphur sol is an example of colloidal type: |
| A. | Association |
| B. | hydrophilic |
| C. | lyophilic |
| D. | lyophobic |
| Answer» D. lyophobic | |
| 8. |
Thixotropic type of behavior is shown by the gel: |
| A. | bentonite |
| B. | pectin |
| C. | silica |
| D. | starch |
| Answer» A. bentonite | |
| 9. |
In the determination of size, shape and structure of colloidal particles, which one of the following CAN NOT be used? |
| A. | electron microscope |
| B. | instrument measuring light scattering |
| C. | Langmuir film balance |
| D. | ultramicroscope |
| Answer» D. ultramicroscope | |
| 10. |
Surfactant solutions are termed as association colloids when their concentrations are: |
| A. | insufficient to saturate the bulk phase |
| B. | insufficient to saturate the interface |
| C. | less than critical micellar concentration (cmc) |
| D. | more than cmc |
| Answer» D. more than cmc | |
| 11. |
Name the type of colloidal dispersion to which electrolytes are normally added in small quantities to stabilize: |
| A. | association |
| B. | lyophilic |
| C. | lyophobic |
| D. | micellar |
| Answer» C. lyophobic | |
| 12. |
Protective colloids DO NOT: |
| A. | aid in dispersion |
| B. | decrease the zeta potential |
| C. | lower the interfacial tension |
| D. | offer a mechanical barrier |
| Answer» C. lower the interfacial tension | |
| 13. |
Which one of the following colloids is difficult to prepare? |
| A. | association |
| B. | hydrophilic |
| C. | hydrophobic |
| D. | lyophilic |
| Answer» C. hydrophobic | |
| 14. |
In high concentrations, electrolytes destabilize a lyophilic sol by a process termed as : |
| A. | coagulation |
| B. | dilution |
| C. | salting out |
| D. | solvation |
| Answer» C. salting out | |
| 15. |
Which quality of the dispersed phase is responsible for the increased viscosity of a hydrophilic colloidal dispersion? |
| A. | charge |
| B. | shape |
| C. | size |
| D. | surface area |
| Answer» D. surface area | |
| 16. |
Dispersion of acacia in water gives the colloid of type: |
| A. | association |
| B. | negative |
| C. | neutral |
| D. | positive |
| Answer» B. negative | |
| 17. |
Addition of alcohol to a hydrophilic colloid leads to: |
| A. | crystallization |
| B. | hydration |
| C. | precipitation |
| D. | stabilization |
| Answer» C. precipitation | |
| 18. |
The critical value of zeta potential (in milli volts) for a stable colloid (except gold sol) is: |
| A. | from 20 to 50 |
| B. | from 50 to 100 |
| C. | less than 20 |
| D. | mor than 100 |
| Answer» A. from 20 to 50 | |
| 19. |
If kinetic energy of interaction is about 25 kT (Where k is gas constant), the system can be considered to have: |
| A. | deflocculated state |
| B. | long half life |
| C. | short half life |
| D. | weak attractiton forces |
| Answer» B. long half life | |
| 20. |
In foams, the dispersed phase and dispersion medium, respectively, are: |
| A. | gas and liquid |
| B. | gas and solid |
| C. | liquid and gas |
| D. | solid and gas |
| Answer» A. gas and liquid | |
| 21. |
The characteristic of a lyophobic sol is that: |
| A. | electrolytes in small amounts induce stabilization |
| B. | it is reversible |
| C. | particles have high electric charge |
| D. | viscosity increases by the presence of particles |
| Answer» C. particles have high electric charge | |
| 22. |
Hydrosol refers to a system in which the dispersed phase and dispersion medium, respectively, are: |
| A. | gas and water |
| B. | liquid and water |
| C. | solid and water |
| D. | water and solid |
| Answer» C. solid and water | |
| 23. |
Electrodialysis is used, when impurities in a sol are: |
| A. | amphiphiles |
| B. | colloids |
| C. | electrolytes |
| D. | nonelctrolytes |
| Answer» C. electrolytes | |
| 24. |
Under ultramicroscope, colloid particles appear as: |
| A. | bright specks against dark background |
| B. | concentric rings |
| C. | dark specks against bright background |
| D. | fluorescent specks |
| Answer» A. bright specks against dark background | |
| 25. |
Which one of the following properties is extensively applied for determining the molecular weight of polymer? |
| A. | depression of freezing point |
| B. | elevation of boiling point |
| C. | lowering of vapour pressure |
| D. | osmotic pressure |
| Answer» D. osmotic pressure | |
| 26. |
Aerosol is the reverse of : |
| A. | emulsion |
| B. | liquid foam |
| C. | smoke |
| D. | solid foam |
| Answer» B. liquid foam | |
| 27. |
In the determination of the gold number of a protective colloid, the endpoint is indicated by: |
| A. | measuring the change in particle size |
| B. | noting sedimentation volume of gold |
| C. | observing the color change |
| D. | weighing of the precipitate |
| Answer» C. observing the color change | |
| 28. |
The semipermeable membrane used in haemodialysis is: |
| A. | cellophane |
| B. | cellulose acetate |
| C. | polyethene |
| D. | polyvinyl acetate |
| Answer» A. cellophane | |
| 29. |
The stability of acacia in water is due to: |
| A. | formation of micelles |
| B. | hydration of solids |
| C. | lowering interfacial tension |
| D. | presence of electrical charge |
| Answer» B. hydration of solids | |
| 30. |
The molecular weight of dispersed solids in a colloidal system can be determined using an instrument: |
| A. | ultracentrifuge |
| B. | ultrafilters |
| C. | ultramicroscope |
| D. | zeta meter |
| Answer» A. ultracentrifuge | |
| 31. |
When the size of particle is less than 1nm then it is called |
| A. | Molecular dispersions |
| B. | Colloidal dispersions |
| C. | Suspension |
| D. | Emulsion |
| Answer» A. Molecular dispersions | |
| 32. |
The movement of colloidal particles through a liquid under the influence of electric field is called |
| A. | Electrophoresis |
| B. | Electro-osmosis |
| C. | Electro chemical reaction |
| D. | Electrodialysis |
| Answer» A. Electrophoresis | |
| 33. |
The potential difference develop when particles settle under the influence of gravity is called |
| A. | Streaming potential |
| B. | Oxidation Potential |
| C. | Reduction potential |
| D. | Sedimentation potential |
| Answer» D. Sedimentation potential | |
| 34. |
When distance between the particle are large, the particles experience attractive force and aggregates are formed. This is known as |
| A. | Primary minimum |
| B. | Potential barrier |
| C. | secondary minimum |
| D. | Interparticle distance |
| Answer» C. secondary minimum | |
| 35. |
According to schulze-Hardy rule, the precipitating power increases rapidly with the |
| A. | Presence of valence or charge of the ions |
| B. | Lowering the interfacial tension |
| C. | Decreasing the freezing point |
| D. | Elevationof boiling point |
| Answer» A. Presence of valence or charge of the ions | |
| 36. |
When a beam of light is pass through a colloidal solution, the path of light gets illuminated. This phenomenon is known as |
| A. | Brownian movement |
| B. | Diffusion |
| C. | Tyndall effect |
| D. | Donnan effect |
| Answer» C. Tyndall effect | |
| 37. |
The continuous collisions between the colloidal particles and molecules of dispersion medium produce zigzag movement of colloidal particles which is known as |
| A. | Brownian movement |
| B. | Tyndall effect |
| C. | Diffusion |
| D. | Sedimentation |
| Answer» A. Brownian movement | |
| 38. |
The protective ability of colloids is measured as |
| A. | Zeta potential |
| B. | Streaming potential |
| C. | Gold number |
| D. | None of the above |
| Answer» C. Gold number | |
| 39. |
If the gold number is less then the protective action will be |
| A. | more |
| B. | Less |
| C. | Half |
| D. | Zero |
| Answer» A. more | |
| 40. |
In sol, the dispersed phase and dispersion medium are |
| A. | Solid and liquis |
| B. | Liquid and liquid |
| C. | Solid and solid |
| D. | Liquid and Gas |
| Answer» A. Solid and liquis | |
| 41. |
Homogenous phase (True solution) having size range of |
| A. | 0.5 to 1.0 µm |
| B. | <0.1 nm |
| C. | >0.01 µm |
| D. | <0.01 µm |
| Answer» D. <0.01 µm | |
| 42. |
Heterogeneous phase (Coarse dispersion) having size range of … |
| A. | 0.5 to 1.0 µm |
| B. | 10 to 100 µm |
| C. | 10 to 1000 µm |
| D. | 1 to 10 µm |
| Answer» C. 10 to 1000 µm | |
| 43. |
Solubility of Drug can be improved by… |
| A. | Targeting drug to specific organ |
| B. | Addition of emulsifying agent |
| C. | Addition of thickening agent |
| D. | Addition of Surface active agent |
| Answer» D. Addition of Surface active agent | |
| 44. |
Targeting of drugs to specific organs can be achieved by |
| A. | Liposomes |
| B. | Emulsion |
| C. | Syrup |
| D. | Suspension |
| Answer» A. Liposomes | |
| 45. |
The following statement is appropriate for Molecular Dispersion |
| A. | Diffusion rate is slow |
| B. | Impermeable across semipermeable membrane |
| C. | Does not scatter light |
| D. | Particle size less than 1.0 µm |
| Answer» C. Does not scatter light | |
| 46. |
The following statement is NOT appropriate for Molecular dispersion |
| A. | Shows tyndall effect |
| B. | Does not scatter light |
| C. | Diffusion rate is rapid |
| D. | Does not settle on ultracentrifugation |
| Answer» A. Shows tyndall effect | |
| 47. |
The following statement is true for Colloidal dispersion |
| A. | Diffusion rate is slow |
| B. | Impermeable across semipermeable membrane |
| C. | Shows tyndall effect |
| D. | All of above |
| Answer» D. All of above | |
| 48. |
In _____Colloids, dispersed particles have a greater affinity to the dispersion medium. |
| A. | Lyophilic colloids |
| B. | Lyophobic colloids |
| C. | Association colloids |
| D. | Molecular colloids |
| Answer» A. Lyophilic colloids | |
| 49. |
Dispersion of rubber or polystyrene in benzene or ethyl methyl ketone is referred to as________ |
| A. | Hydrophilic colloids |
| B. | Lyophilic colloids |
| C. | Lyophobic colloids |
| D. | Hydrophobic colloids |
| Answer» B. Lyophilic colloids | |
| 50. |
Lyophobic colloids can be prepared by |
| A. | Chemical method |
| B. | Peptization method |
| C. | Electric arc method |
| D. | All of above |
| Answer» D. All of above | |
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