1. Is string a value type of reference type? 2. Big O - for loop, binary search, hash table lookup 3. Can you use object as a key in a dictionary? - answer is yes, using GetHashCode 4. Get 7th highest salary without CTE 5. What is RDBMS, disadvantages of Normalized Db 6. Delegates in C# 7. new keyword in JS, 8. (non)Clustered indexes - how of each can be there