Philips Software Engineer/.NET Developer interview questions

First question was on the projects i had worked on in my last company as I had applied on 2.5 years experience. After that some questions to write code: SQL: que1: Get counts of people belonging to different cities from a table having, table.Sno, table.Name, Table.city que2: What is nomalization in the DB and how do we achieve that. C#: que3: What are static class and static methods? que4: How does garbage collection works on static class? que5: What are heap and stack memories? que6: Using LINQ Sort a given list of strings. que7: How do we make our code thread safe? que8: Explain thread synchronisation and its techniques. que9: When do we use interfaces and when abstract classes? que10: What are delegates in c#.