6. What is the characteristic of matrix dissolution-controlled release 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) Employ waxes to control the rate of dissolution

7. What is the characteristic of encapsulation or coating dissolution-controlled releasesystems?

a) Microencapsulation using slowly dissolving materials
b) Prolonged their residence in the GIT and release
c) Release only at a specific drug
d) Employ waxes to control the rate of dissolution

8. What are the characteristics of diffusion-controlled release systems?
a) Release the drug along the entire length of GIT
b) Diffusion of the dissolved drug
c) Release only at a specific drug
d) Employ waxes to control the rate of dissolution

9. What are the characteristics of Matrix diffusion-controlled release systems?
a) Release the drug along the entire length of GIT
b) Drug disperse in an insoluble matrix of rigid hydrophobic materials
c) Release only at a specific drug
d) Employ waxes to control the rate of dissolution

10. What are the characteristics of reservoir devices-controlled release systems?
a) Release the drug along the entire length of GIT
b) Drug disperse in the insoluble matrix of rigid hydrophobic materials
c) Hollow systems containing drug surrounded by a polymer membrane
d) Employ waxes to control the rate of dissolution