Find the invalid identifier from the following:

1. name
2. break
3. section
4. mark12

Which of the following is not a keyword?

1. eval
2. assert
3. nonlocal
4. pass

Which of these is not a core data type?

1. Lists
2. Dictionary
3. Tuples
4. Class

How would you write x^y in Python as an expression ?

1. x^y
2. x**y
3. x^^y
4. none of these