Physical Pharmaceutics 4th Semester Top 15 Important Questions | Imperfect Pharmacy

The video is an exam preparation guide for B. Pharmacy 4th Semester Physical Pharmaceutics, presented in Hindi. The instructor outlines 15 high-priority questions that cover the majority of the syllabus, acknowledging that while many topics are included, significant portions of the lengthy syllabus have been intentionally omitted to keep it manageable.

The first two questions focus on colloids — their classification, definition, and pharmaceutical applications, followed by the various properties of colloids including optical, kinetic, and electrical properties. The instructor notes that these properties may be asked in different combinations.

Questions three and four address rheology topics: non-Newtonian systems (plastic, pseudoplastic, and dilatant flow, along with thixotropy) and methods for determination of viscosity (capillary viscometers and rotational viscometers like the cup and bob type).

Questions five through nine deal with solid deformation, emulsions, and suspensions. These include Hook's equation and elastic modulus, classification of emulsions (including multiple and micro emulsions), theories of emulsification, flocculated vs. deflocculated suspensions, and stability problems in emulsions such as cracking and creaming.

Questions ten through twelve cover micromeritics: methods for particle size determination (including the Coulter counter and sieve method), surface area determination methods, and derived properties of powders such as flow properties.

The final three questions address pharmaceutical stability: accelerated stability testing and its role in determining expiry periods of dosage forms, factors affecting chemical degradation of pharmaceutical products (temperature, solvent, ionic strength, dielectric constant, specific and general acid-base catalysis), and zero-order and first-order reaction kinetics including half-life and shelf-life calculations.