JavaScript Questions & Answers – The Document Object Model

This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “The Document Object Model”.

1. Which function among the following lets to register a function to be invoked once?
a) setTimeout()
b) setTotaltime()
c) setInterval()
d) settime()
View Answer

2. Which function among the following lets to register a function to be invoked repeatedly after a certain time?
a) setTimeout()
b) setTotaltime()
c) setInterval()
d) settime()
View Answer

3. Which is the handler method used to invoke when uncaught JavaScript exceptions occur?
a) Onhalt
b) Onerror
c) Both onhalt and onerror
d) Onsuspend
View Answer

4. Which property is used to obtain browser vendor and version information?
a) modal
b) version
c) browser
d) navigator
View Answer

5. Which method receives the return value of setInterval() to cancel future invocations?
a) clearInvocation()
b) cancelInvocation()
c) clearInterval()
d) clear()
View Answer

6. The setTimeout() belongs to which object?
a) Element
b) Window
c) Location
d) Event
View Answer

7. Which method receives the return value of setTimeout() to cancel future invocations?
a) clearTimeout()
b) clearInterval()
c) clearSchedule()
d) cancelInvocation()
View Answer

8. What will happen if we call setTimeout() with a time of 0 ms?
a) Placed in stack
b) Placed in queue
c) Will run continuously
d) Will execute immediately
View Answer

9. To which object does the location property belong?
a) Window
b) Position
c) Element
d) Location
View Answer

10. What is the result of the following code snippet?

window.location === document.location

a) False
b) True
c) 0
d) 1
View Answer

11. What will be the output of the following JavaScript code?

function getcube()
{  
    var number=document.getElementById("number").value;  
    alert(number*number*number);  
}
<form>  
     Enter No:<input type="text" id="number" value="3" name="number"/><br/>  
     <input type="button"  value="ok" onclick="getcube()"/>  
</form>

a) 9
b) 27
c) Error
d) Undefined
View Answer

12. What will be the output of the following JavaScript code?

function totalelements()  
{  
    var allgenders=document.getElementsByName("gender");  
    alert("Total Genders:"+allgenders.length);  
}  
<form>  
     <input type="radio" name="gender" value="male">  
     <input type="radio" name="gender" value="female">  
     <input type="button" onclick="totalelements()" value="Total Genders">  
</form>

a) 0
b) Error
c) 2
d) 1
View Answer

13. What will be the output of the following JavaScript code?

function counth2()
{  
    var totalh2=document.getElementsByTagName("h2");  
    alert("totalh2.length);  
}  
<h2>hello</h2>  
<h2>hello</h2>

a) 0
b) hello
c) h2
d) 2
View Answer

14. What will be the output of the following JavaScript code?

function validate() 
{  
    var msg;  
    if(document.myForm.userPass.value.length>5)
    {  
        msg="good";  
    }  
    else
    {  
         msg="poor";  
    }  
    document.getElementById('mylocation').innerText=msg;  
}  
<form name="myForm">  
<input type="password" value="rhuld"  onkeyup="validate()">  
Strength:<span id="mylocation">no strength</span>  
</form>

a) Strength: good
b) Strength: poor
c) Strength: no strength
d) Undefined
View Answer

15. What will be the output of the following JavaScript code?

function showcommentform() 
{  
    var data=”new text”  
    document.getElementById('mylocation').innerHTML=data;  
}  
<form name="myForm">  
<input type="button" value="comment" onclick="showcommentform()">  
<div id="mylocation"></div> 
</form>

a) Comment
b) new text
c) Error
d) Undefined
View Answer

Sanfoundry Global Education & Learning Series – Javascript Programming.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]