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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:

What is the return type of the main() method?

Answer Main() method doesn't return anything hence declared void.
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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

Q:

What are instance variables?

Answer Instance variables are those which are defined at the class level. Instance variables need not be initialized before using them as they are automatically initialized to their default values.
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Subject: Java

Q:

Is Java a pure object oriented language?

Answer

Java uses primitive data types and hence is not a pure object oriented language.

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Subject: Java

Q:

Are arrays primitive data types?

Answer In Java, Arrays are objects.
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Subject: Java

Q:

Does Java support multiple inheritance?

Answer Java doesn't support multiple inheritance.
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Subject: Java

Q:

What is difference between Path and Classpath?

Answer

PATH and CLASSPATH are operating system level environment variables. PATH is used to define where the system can find the executables (.exe) files whereas CLASSPATH is used to specify the location of .class files.

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Subject: Java