Data Independence

1) Explain and discuss advantages of dbms over traditional file based system
2) What is data abstration? what are various level of abstraction in DBMS
3) What do you understand by data independence?
4) Explain and differentiate logical and physical data independence
5) What are locks? Explain different types of locks

Your question is too much theoritical and is beyond the scope of this discussion. You need to follow some good books on the topic or can easily find all that by investing some time in websearching.