Basic And Variables MCQ question and answer in javascript with solution

/ / Basic And Variables

31.
The output for the following code snippet would most appropriately be 
var a=5 , b=1
var obj = { a : 10 }
with(obj) 
{
      alert(b)
}

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32.
The output for the following code snippet would most appropriately be 
var a=5 , b=1
var obj = { a : 10 }
with(obj) 
{
      alert(b)
}

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33.
A conditional expression is also called a

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34.
Which is a more efficient code snippet ?
Code 1 : 
for(var num=10;num>=1;num--)
{
    document.writeln(num);
}

Code 2 :
var num=10;
while(num>=1)
{
    document.writeln(num);
    num++;
}

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35.
A statement block is a

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