HashedIn by Deloitte interview questions

Describe a complex problem your team had to solve. What was your role?

1) What is Encapsulation and Polymorphism 2) Difference between Abstraction and Interface 3) Difference between IQueryable and IEnumerable 4) Explain Extension Methods, Anonymous method, Middleware 5) Write a C# program for reversing of the Whole String. 6) Write a C# program to print index of Array from given Array Of Numbers [2, 7, 11, 15] whose Sum is 9.