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
| 151. |
Microemulsion is NOT considered to be a true emulsion, because: |
| A. | appearance is transparent |
| B. | emulsifier is not used |
| C. | immiscible phase is absent |
| D. | internal phase is not spherical |
| Answer» C. immiscible phase is absent | |
| 152. |
A variety of factors would influence the rate of creaming in an emulsion. The factor open to formulation pharmacist is to regulate: |
| A. | density of dispersion medium |
| B. | density of dispersed phase |
| C. | globule size |
| D. | volume of dispersion medium |
| Answer» C. globule size | |
| 153. |
Normally preservatives are added to an emulsion. One of the following statements is true. |
| A. | amount of the preservative added is below minimum inhibitory concentration |
| B. | emulsifier should enhance the preservative action |
| C. | preservatives remain in the aqueous phase |
| D. | preservatives stay in the oil phase |
| Answer» C. preservatives remain in the aqueous phase | |
| 154. |
For the formulation of w/o emulsion, the coalescence rate of: |
| A. | w/o has no relationship to the type of emulsion formed |
| B. | o/w is equal to w/o coalescence rate |
| C. | o/w is greater than w/o coalescence rate |
| D. | w/o is greater than the o/w coalescence rate |
| Answer» C. o/w is greater than w/o coalescence rate | |
| 155. |
Auxiliary emulsifying agents are used to stabilize the emulsion. They act on the principle: |
| A. | adjusting the HLB value |
| B. | strengthening the nonpolar tails of the emulsifier ^ |
| C. | strengthening the polar heads of the emulsifier |
| D. | thickening the continuous phase |
| Answer» D. thickening the continuous phase | |
| 156. |
Emulsion have a ......... shelf life |
| A. | short |
| B. | no |
| C. | large |
| D. | none of the above |
| Answer» A. short | |
| 157. |
Creaming is a.......... process |
| A. | reversible |
| B. | irreversible |
| C. | A & B |
| D. | difficult to predict |
| Answer» A. reversible | |
| 158. |
O/W emulsions normally cream ......... |
| A. | up first & down then |
| B. | upward |
| C. | downward |
| D. | none of the above |
| Answer» B. upward | |
| 159. |
Microemulsions contain globules of the size about ......... |
| A. | 10 micro meter |
| B. | 1 micro meter |
| C. | 0.1 micrometer |
| D. | 0.01 micrometer |
| Answer» D. 0.01 micrometer | |
| 160. |
Downward creaming means ........ rate of sedimentation |
| A. | negative |
| B. | positive |
| C. | same |
| D. | no change |
| Answer» A. negative | |
| 161. |
A mixture of span 20 and tween 20 forms....... type of emulsion |
| A. | W/O |
| B. | O/W |
| C. | Milky |
| D. | Hard |
| Answer» A. W/O | |
| 162. |
Density of oily phase increased by addition of ....... |
| A. | Butter |
| B. | Coconut oil |
| C. | water |
| D. | brominated oils |
| Answer» C. water | |
| 163. |
Near CMC, micelles of the surfactant molecules assume the shape of |
| A. | spherical |
| B. | layered |
| C. | rod shaped |
| D. | cylindrical |
| Answer» A. spherical | |
| 164. |
Which one of the following emulsifier is used to stabilise the emulsion of W/O type |
| A. | SLS |
| B. | Span 20 |
| C. | Tween 20 |
| D. | Tragacanth |
| Answer» B. Span 20 | |
| 165. |
Creaming in emulsion can be controlled by regulating |
| A. | density of dispersed phase |
| B. | density of dispersion medium |
| C. | globule size |
| D. | volume of dispersion medium |
| Answer» C. globule size | |
| 166. |
An emulsifier is considered to be ideal, if it is soluble in |
| A. | Aqueous phase |
| B. | oily phase |
| C. | A & B |
| D. | none of the above |
| Answer» C. A & B | |
| 167. |
In the stability of emulsion, which important instability step should be prevented? |
| A. | Breaking |
| B. | Coalescence |
| C. | Flocculation |
| D. | Creaming |
| Answer» B. Coalescence | |
| 168. |
Emulsions made with tweens are |
| A. | W/O |
| B. | O/W |
| C. | Clear |
| D. | Unstable |
| Answer» B. O/W | |
| 169. |
The HLB system is used classify |
| A. | Flavours |
| B. | Colours |
| C. | Surfactants |
| D. | Perfumes |
| Answer» C. Surfactants | |
| 170. |
Emulsion containing more than two phases are called as |
| A. | Mixed emulsion |
| B. | Multiple emulsion |
| C. | Complex emulsion |
| D. | none of the above |
| Answer» B. Multiple emulsion | |
| 171. |
Emulsion is |
| A. | stable preparation |
| B. | thermodynamically unstable preparation |
| C. | biphasic system |
| D. | B & C |
| Answer» D. B & C | |
| 172. |
Which of the following is/ are the theories of emulsification? |
| A. | Monomolecular adsorption theory |
| B. | Multimolecular adsorption theory |
| C. | Solid Particle Adsorption theory |
| D. | All of the above |
| Answer» D. All of the above | |
| 173. |
Which of the following is not the cause of Instability in emulsion |
| A. | Upward Creaming |
| B. | Phase inversion |
| C. | Downward creaming |
| D. | Mottling |
| Answer» D. Mottling | |
| 174. |
Which of the following is a reversible phenomenon |
| A. | Creaming |
| B. | Coalescence |
| C. | Breaking |
| D. | All of the above |
| Answer» A. Creaming | |
| 175. |
The phase inversion occur due to |
| A. | changes in type of emulsifying agent |
| B. | change in phase volume ratio. |
| C. | Both a and b |
| D. | None of the above |
| Answer» C. Both a and b | |
| 176. |
Which of the following is used as antioxidants for emulsified systems |
| A. | Dodecyl gallate, |
| B. | Butylated hydroxyanisole (BHT), |
| C. | Butylated hydroxytoluene (BHT) |
| D. | All of the above |
| Answer» D. All of the above | |
| 177. |
Which of the following is identification test for emulsion |
| A. | Dilution test |
| B. | Cobalt Chloride Test |
| C. | Conductivity Test |
| D. | All of the above |
| Answer» D. All of the above | |
| 178. |
When an emulsion is exposed to ultra-violet radiations. If the continuous fluorescence is observed under microscope, then it is_____________ type emulsion. |
| A. | w/o |
| B. | o/w |
| C. | microemulsion |
| D. | Nano emulsion |
| Answer» A. w/o | |
| 179. |
Dry Gum Method is also known as |
| A. | Continental method. |
| B. | English method |
| C. | Bottle method |
| D. | Forbe's method |
| Answer» A. Continental method. | |
| 180. |
In Dry gum method, 4:2:1 consist of |
| A. | 4 parts oil, 2 parts water, and 1 part emulsifier |
| B. | 4 parts water, 2 parts oil, and 1 part emulsifier |
| C. | 4 parts emulsifier, 2 parts water, and 1 part emulsifier |
| D. | 4 parts oil, 2 parts emulsifier and 1 part water |
| Answer» A. 4 parts oil, 2 parts water, and 1 part emulsifier | |
| 181. |
The rheological property of emulsion can be controlled by |
| A. | nature and concentration of emulsifying system |
| B. | particle size of dispersed phase |
| C. | viscosity of continuous phase |
| D. | All of the above |
| Answer» D. All of the above | |
| 182. |
The suspensions having particle size................... are categorized as coarse suspension. |
| A. | Greater than ~1 mm |
| B. | Greater than-10 mm |
| C. | Both of the above |
| D. | None of the above |
| Answer» A. Greater than ~1 mm | |
| 183. |
............ exists when dispersed solid particles in a suspension retain change in relation their adjoining liquid medium. |
| A. | Surface area |
| B. | Surface potential |
| C. | Surface volume |
| D. | None of the above |
| Answer» B. Surface potential | |
| 184. |
The equal distribution of all the ions in solution retain by…… |
| A. | Electric forces |
| B. | Thermal motion |
| C. | Both of the above |
| D. | None of the above |
| Answer» C. Both of the above | |
| 185. |
The flocculated suspension is one in which zeta potential of particle is…… . |
| A. | -05 to +05 mV |
| B. | -10 to+10 mV |
| C. | -20 to+20 mV |
| D. | -30 to+30 mV |
| Answer» C. -20 to+20 mV | |
| 186. |
...... determines the movement of charged particles via a liquid under the impact of an applied potential difference. |
| A. | Electrophoresis |
| B. | Electrosmosis |
| C. | Surface charge |
| D. | Static movement |
| Answer» A. Electrophoresis | |
| 187. |
..........is produced by forcing a liquid to course through a stationary solid phase. |
| A. | Electrosmosis |
| B. | Electrophoresis |
| C. | The sediment potential |
| D. | The streaming potential |
| Answer» D. The streaming potential | |
| 188. |
The flocculated suspensions sediment............. |
| A. | Slowly |
| B. | Quickly |
| C. | More quickly |
| D. | None of the above |
| Answer» C. More quickly | |
| 189. |
..........suspension involves individual particle settling. |
| A. | Flocculated |
| B. | Deflocculated |
| C. | Both of the above |
| D. | None of the above |
| Answer» B. Deflocculated | |
| 190. |
Structured vehicles are also termed as or.............. |
| A. | Thickening |
| B. | Suspending agents |
| C. | Both of the above |
| D. | None of the above |
| Answer» C. Both of the above | |
| 191. |
....... is the concentration of globules at the top or bottom of the emulsion. |
| A. | Creaming |
| B. | Cracking |
| C. | Phase inversion |
| D. | State |
| Answer» A. Creaming | |
| 192. |
Which of the following properties of a particle significantly affects the physical, chemical and biological properties of the drug? |
| A. | density |
| B. | sedimentation |
| C. | size |
| D. | surface area |
| Answer» D. surface area | |
| 193. |
It is difficult to express the size of particles in a meaningful diameter. |
| A. | irregular in shape |
| B. | irregular surface |
| C. | spherical shape |
| D. | uniform in size |
| Answer» A. irregular in shape | |
| 194. |
The type of a particle diameter obtained largely depends on: |
| A. | method by which it is determined |
| B. | nature of the powder |
| C. | procedure by which it is calculated |
| D. | way it is defined and described |
| Answer» A. method by which it is determined | |
| 195. |
When cumulative percent frequency on a probability scale is plotted against logarithm of the particle size, 50 percent on the probability scale gives the powder particle diameter of: |
| A. | arithmetic mean |
| B. | arithmetic mode |
| C. | geometric mean |
| D. | harmonic mean |
| Answer» C. geometric mean | |
| 196. |
Which one of these distributions is more important in the design of dosage forms? |
| A. | Gaussian |
| B. | normal |
| C. | number |
| D. | weight |
| Answer» D. weight | |
| 197. |
In the formulation development of emulsions and suspensions, what type of diameter is important? |
| A. | length number |
| B. | projected |
| C. | sieve |
| D. | stokes |
| Answer» D. stokes | |
| 198. |
Sieving method is used for size distribution analysis of powder. The disadvantage of this method is: |
| A. | agglomerates can be identified |
| B. | attrition of powder is possible |
| C. | large number of sieves are required |
| D. | tedious and time consuming |
| Answer» B. attrition of powder is possible | |
| 199. |
While using sedimentation method for size analysis, addition of a deflocculating agent to a suspension is necessary in order to: |
| A. | accelerate the process of sedimentation |
| B. | make the particles spherical |
| C. | prevent the aggregation |
| D. | satisfy Reynolds number |
| Answer» C. prevent the aggregation | |
| 200. |
Stokes’ law cannot be used, if Reynolds number is more than: |
| A. | 0.2 |
| B. | 1.8 |
| C. | 9.0 |
| D. | 18.0 |
| Answer» A. 0.2 | |
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