JavaScript Questions & Answers – The jQuery Library

This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “The jQuery Library”.

1. Which of the following is not the feature of jQuery?
a) Efficient query method for finding the set of document elements
b) Expressive syntax for referring to elements in the document
c) Useful set of methods for manipulating selected elements
d) Powerful functional programming techniques is not used for operating on sets of elements as a group
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2. Which of the following is a single global function defined in the jQuery library?
a) jQuery()
b) $()
c) Queryanalysis()
d) global()
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3. Which of the following is a factory function?
a) $()
b) jQuery()
c) Queryanalysis()
d) onclick()
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4. Which is the JavaScript code that asks for the set of all div elements in a document?
a)

 var divs = $(div);

b)

 var divs = jQuery("div");

c)

 var divs = $("div");

d)

var divs = #("div");

var divs = $("div");

5. Which is the method that operates on the return value of $()?
a) show()
b) css()
c) click()
d) done()
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6. What does the min mean in the following JavaScript code?

<script src="jquery-1.4.2.min.js"></script>

a) Minimised version
b) Miniature
c) Minimised parameters
d) Minimum value
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7. Which of the following is a heavily overloaded function?
a) jQuery()
b) $()
c) script()
d) Both jQuery() and $()
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8. Which of the following is an equivalent replacement of $(document).ready(f)?
a) jQuery(f)
b) $(f)
c) #(f)
d) read(f)
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9. Which of the following is a utility function in jQuery?
a) jQuery.each()
b) jQuery.parseJSON()
c) jQuery.noConflict()
d) jQuery.conflict()
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10. Which of the following is used for parsing JSON text?
a) jQuery.each()
b) jQuery.parseJSON()
c) jQuery.noConflict()
d) jQuery.conflict()
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11. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
   var str = "Tables";
   var patt1 = /tables/i;
   var result = str.match(patt1);
   document.getElementById("demo").innerHTML = result;
}
</script>

a) Tables
b) tables
c) Undefined
d) Error
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12. What will be the output of the following JavaScript code?

<script>
var str = "The rain in Spain";
var patt1 = /ain/g;
document.write(patt1.lastIndex);
</script>

a) 8
b) 17
c) 14
d) 10
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13. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
   var str = "\nIs th\nis it?";
   var patt1 = /^is/m;
   var result = str.match(patt1);
   document.getElementById("demo").innerHTML = result;
}
</script>

a) IS
b) is
c) Error
d) Undefined
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14. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
   var str = "Hellooo World!"; 
   var patt1 = /o+/g;
   var result = str.match(patt1);
   var count=0;
   While(result[i]!=NULL)
   {
       If(result[I]==o)
       count++;
   }
   document.getElementById("demo").innerHTML = count;
}
</script>

a) 4
b) 3
c) 1
d) 0
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15. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
    var str = "Is this his";
    var patt1 = /is$/g;
    var result = str.match(patt1);
    if(result)
  	result='true';
    else
    result='false';
    document.getElementById("demo").innerHTML = result;
}
</script>

a) true
b) false
c) error
d) undefined
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Sanfoundry Global Education & Learning Series – Javascript Programming.