11. What are the characteristics of ion exchange resin drug complexes?
a) Release the drug along the entire length of GIT
b) Drug disperse in an insoluble matrix of rigid hydrophobic materials
c) Hollow systems containing drug surrounded by a polymer membrane
d) Formation of complexes between the drug and anion/cation exchange resins

12. What is the characteristic of pH-independent formulations?
a) Buffering agents that adjust pH to the desired value
b) Drug disperse in the insoluble matrix of rigid hydrophobic materials
c) Hollow systems containing drug surrounded by a polymer membrane
d) Formation of complexes between the drug and anion/cation exchange resins

13. What are the characteristics of osmotic pressure-controlled systems?
a) Buffering agents that adjust pH to the desired value
b) Releases the drug at a zero-order kinetics
c) Hollow systems containing drug surrounded by a polymer membrane
d) Formation of complexes between the drug and anion/cation exchange resins

14. Osmotic pressure controlled systems work on the principle of osmotic pressure releasing the drug at constant 1st order kinetics.
a) True
b) False

15. What are the characteristics of hydrodynamic pressure controlled systems?
a) Buffering agents that adjust pH to the desired value
b) Drug disperse in an insoluble matrix of rigid hydrophobic materials
c) Generated by swelling hydrophilic hum
d) Formation of complexes between the drug and anion/cation exchange resins