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Q:

Can a class be declared as protected?

Answer A class can't be declared as protected. only methods can be declared as protected.
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Subject: Java

Q:

Which package is imported by default?

Answer java.lang package is imported by default even without a package declaration.
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Subject: Java

Q:

Can a source file contain more than one class declaration?

Answer Yes a single source file can contain any number of Class declarations but only one of the class can be declared as public.
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Subject: Java

Q:

Does the order of public and static declaration matter in main() method?

Answer No. It doesn't matter but void should always come before main().
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Subject: Java

Q:

Can a main() method be declared final?

Answer Yes. Any inheriting class will not be able to have it's own default main() method.
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Subject: Java

Q:

How to define a constant variable in Java?

Answer The variable should be declared as static and final. So only one copy of the variable exists for all instances of the class and the value can't be changed also.
static final int PI = 2.14; is an example for constant.
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Q:

Should a main() method be compulsorily declared in all java classes?

Answer No not required. main() method should be defined only if the source class is a java application.
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Subject: Java

Q:

Why is the main() method declared static?

Answer

main() method is called by the JVM even before the instantiation of the class, hence it is declared as static.

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Subject: Java