Physical Pharmaceutics II(BP403TP)

1.       The density of the dispersed phase is more than that of dispersion medium. According to the Stoke’s equation the creaming is in:

•   at the center of the emulsion

• in both the directions

• in downward direction

• in upward direction

    Emulsions  are  defined  as thermodynamically  unstable  systems. The  events  that  follow  sequentially towards instability are:

•    coalescence, breaking, creaming and flocculation

•   coalescence, flocculation, creaming and breaking

• flocculation, creaming, breaking and coalescence

• flocculation, creaming, coalescence and breaking

Creaming is a ………process.

•   Reversible

• Irreversible

• A & B

• Difficult to predict

Microemulsions contain globules of the size about ……

• 10 micro meter

• 1 micro meter

• 0.1 micro meter

• 0.01 micro meter

The size of 10 big divisions on stage micrometer is…….

• 100 um

• 1 mm

• 0.1 um

• 0.01 um

  Name the apparatus used to find the particle size by conductivity method

•   Coulter Counter

•   Anderson Apparatus

• Stage micrometer

• Sieve shaker

Another name for Carr’s index

•   

  Compressibility index

     

•   Consolidation index

• Both A and B

• None

The particle size in sedimentation  method  is denoted in the form of……

• Volume diameter

• Surface diameter

• Stokes diameter

• Projected diameter

  What does F= 1 signify?

• There is no sedimentation

• Suspension is ideal

• Both a and b

• There is full sedimentation

If your emulsion is W/O type and if you add methylene blue to it. What will be the inference?

• The external phase turns blue

• droplets of blue colour will be observed

• entire emulsion turns red

• no change