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Q:

I do not want my class to be inherited by any other class. What should i do?

Answer You should declared your class as final. But you can't define your class as final, if it is an abstract class. A class declared as final can't be extended by any other class.
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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:

What do you mean by platform independence?

Answer

Platform independence means that we can write and compile the java code in one platform (Eg Windows) and can execute the class in any other supported platform (Eg Linux,Solaris,etc).

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Subject: Java

Q:

Are objects passed by value or by reference?

Answer Everything is passed by value.
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Subject: PHP

Q:

How do you pass a variable by value?

Answer Just like in C++, put an ampersand in front of it, like $a = &$b
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Subject: PHP