Learning Encapsulation through Package

Q1. Which of the following package stores all the standard java classes?
Q2. For which purpose packages are used in Java?
Q3. A package is a collection of_____.
Q4. Which of the following is/are advantages of packages?
Q5. Which of the following is/are true about packages in Java? 1) Every class is part of some package. 2) All classes in a file are part of the same package. 3) If no package is specified, the classes in the file go into a special unnamed package 4) If no package is specified, a new package is created with folder name of class and the class is put in this package.