16. What is the characteristics of altered density systems?
a) Release the drug along the entire length of GIT
b) Prolonged their residence in the GIT and release
c) Release only at a specific drug
d) Use of high or low density pellets

17. What are the characteristics of floating or buoyant capsule systems?
a) Release the drug along the entire length of GIT
b) Granule drug with hydro gel
c) Release only at a specific drug
d) Use of high or low density pellets

18. What is the characteristics of mucoadhesive systems?
a) Release the drug along the entire length of GIT
b) Prolonged their residence in the GIT and release
c) Usage of bio adhesive polymer
d) Use of high or low density pellets

19. Enteric coating are used for which systems?
a) Intestinal release systems
b) Colonic release systems
c) Size based systems
d) Mucoadhesive systems

20. Drugs cannot be delivered to the colon.
a) True
b) False

21. What are the characteristics of intestinal release systems?
a) Release the drug along the entire length of GIT
b) Prolonged their residence in the GIT and release
c) Usage of polymers that dissolves only in the alkaline pH of colon
d) Use of enteric coating