I have give a test and i got this two answer wrong can anyone explain why my answer are wrong...

Question 25

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Which of the following declaration(s) is/are correct for a String?  Tick all correct answer(s).  No partial marks and no negative marks.

Select one or more:

String s4=(String)'\\ufeed';

String s2='null';

String s1=null; <-----------------------------------------My Answer

String s3=(String)'abc';

Question 22

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What will be the output of the following program?

class operators {

public static void main(String args[])

{

 int var1 = 5; 

 int var2 = 6;

 int var3;

 var3 =  var2 * var1 / var2 + var2;

 System.out.print(var2);

} 

}

Select one:

6 <------------------------------------------------------------- my answer 

5

12

11