Download RTMNU B.Pharma 5th Semester 2017 Winter Pharmaceutics V (Physical Pharmacy) Question Paper

NRJ/KW/17/4279

B.Pharm Examination

PHARMACEUTICS—V (Physical Pharmacy)

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Paper-1

[Maximum Marks : 80

Time : Three Hours]

N.B. :- (1) Question No. 1 is compulsory.

(2) Attempt any four questions out of remaining.

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(3) All questions carry equal marks.

(4) Draw neat labelled diagram wherever necessary.

(5) Assume suitable data wherever necessary.

1. Attempt any five of the following :
   1. Explain why mixed emulsifiers produce a more stable emulsion than single emulsifier.
   2. How the surfactants are classified according to HLB ?

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   3. What is Hofmeister series ?
   4. What is critical micelle concentration ? What is its significance ?
   5. What are the factors responsible for Sedimentation of particles ? How they can be controlled ?
   6. Describe the mechanism by which particle gets charged in the medium.
   7. Define :
      1. Interfacial tension

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      2. Adsorption.

   5×4=20

2. 1. Give the applications of colloids.

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   8

   2. What is effect of electrolyte on CMC of surfactants ?

   7

3. What is zeta potential ? What is Nernst potential and electrokinetic potential ? How does it control physical stability of emulsions ?

   15

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4. Derive the equation for Langmuir's adsorption isotherm.

   15

5. 1. Explain DLVO theory of suspensions.

   8

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   2. Write a note on controlled flocculation.

   7

6. What is angle of repose? How it is determined ? What is its significance ? Describe derived properties of powders.

   15

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7. Write notes on (any two)
   1. Porosity, its types and significance
   2. Davies theory of emulsions
   3. Classification of surfactants as per chemical structure.

   15

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