Which of the following does not represent a character literal ?

1. 'a'
2. '1'
3. '\a'
4. "a"

Which keyword turns a variable declaration into constant declaration ?

1. const
2. constant
3. final
4. fixed

The Math class is part of which Java library package.

1. java.util
2. java.io
3. java.random
4. java.lang

Which clause is optional in a switch statement?

1. switch
2. case
3. default
4. none of the above