Javascript Quiz Questions and Answers

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Find below MCQ (Multiple Choice) questions and Answers useful for learning Javascript.

1) <script type="text/javascript"> x=4+"4"; document.write(x); </script> Output------?
a) 44
b) 8
c) 4
d) Error output
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2) <script type="text/javascript" language="javascript"> var qpt = "Qualiyt Point Technologies"; var result = qpt.split(" "); document.write(result); </script>
a) Quality
b) Q,u,a,l,i,t,y,P,o,i,n,t,T,e,c,h,n,o,l,o,g,i,e,s
c) Qualiyt,Point,Technologies
d) QualityPointTechnologies
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3) Is it possible to nest functions in JavaScript?
a) True
b) False
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4) <script> document.write(navigator.appCodeName); </script>
a) get code name of the browser of a visitor
b) set code name of the browser of a visitor
c) None of the above
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5) Which of the following is true?
a) If onKeyDown returns false, the key-press event is cancelled.
b) If onKeyPress returns false, the key-down event is cancelled.
c) If onKeyDown returns false, the key-up event is cancelled.
d) If onKeyPress returns false, the key-up event is canceled.
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6) Scripting language are
a) High Level Programming language
b) Assembly Level programming language
c) Machine level programming language
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7) Which best explains getSelection()?
a) Returns the VALUE of a selected OPTION.
b) Returns document.URL of the window in focus.
c) Returns the value of cursor-selected text
d) Returns the VALUE of a checked radio input.
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8) <script language="javascript"> function x() { var s= "Good 100%"; var pattern = /\D/g; var output= s.match(pattern); document.write(output); } </script>
a) Good %
b) 1,0,0
c) G,o,o,d,%
d) Error
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9) <script language="javascript"> var qpt="QUALITY POINT TECHNOLOGIES"; alert(qpt.charAt(qpt.length-1)); </script>
a) P
b) E
c) S
d) Error
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10) Choose the client-side JavaScript object:
a) Database
b) Cursor
c) Client
d) FileUpLoad
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11) Are java and javascript the same?
a) NO
b) YES
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12) Syntax for creating a RegExp object: (a). var txt=new RegExp(pattern,attributes); (b). var txt=/pattern/attributes; Which of the above mentioned syntax will correct?
a) (a) only
b) (b) only
c) Both (a) and (b)
d) None of the above
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13) <script language="javascript"> function x(z,t) { alert(x.length); } </script> output: ?
a) Error
b) 2
c) 1
d) 3
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14) What is mean by "this" keyword in javascript?
a) It refers current object
b) It referes previous object
c) It is variable which contains value
d) None of the above
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15) In JavaScript, Window.prompt() method return true or false value ?
a) False
b) True
c) None of above
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16) Math. round(-20.51)=?
a) 20
b) -21
c) 19
d) None
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17) <script language="javascript"> function x() { var s = "Quality 100%!{[!!"; var pattern = /\w/g; var output = s.match(pattern); document.write(output); } </script>
a) %,!,{,[,!,!
b) Q,u,a,l,i,t,y,1,0,0
c) Quality 100
d) Error
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18) <script type="text/javascript" language="javascript"> var qpt= new Array(); qpt[0] = "WebDevelopment"; qpt[1]="ApplicationDevelopment" qpt[2]="Testing" qpt[3] = "QualityPointTechnologies"; document.write(qpt[0,1,2,3]); </script>
a) Error
b) QualityPointTechnologies
c) WebDevelopment
d) WebDevelopmnet,ApplicationDevelopment,Testing,QualityPointTechnologies
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19) Choose the server-side JavaScript object:
a) FileUpLoad
b) Function
c) File
d) Date
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20) parseFloat(9+10)=?
a) 19
b) 910
c) None
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21) <script language="javascript"> function x() { document.write(2+5+"8"); } </script>
a) 258
b) Error
c) 7
d) 78
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22)_________ keyword is used to declare variables in javascript.
a) Var
b) Dim
c) String
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23) In Javascript, Which of the following method is used to evaluate the regular expression?
a) eval(2*(3+5))
b) evaluate(2*(3+5))
c) evalu(2*(3+5))
d) None of the above
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24) <script language="javascript"> function x() { var s= "quality 100%"; var pattern = /\d/g; var output= s.match(pattern); document.write(output); } </script>
a) 100
b) 1,0,0
c) q,u,a,l,i,t,y,%
d) Error
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25) <script type="text/javascript" language="javascript"> qpt=((45%2)==0)? "hello" : "bye"; document.write(qpt); </script>
a) hello
b) bye
c) Error in string handling
d) None of the above
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26)<script language="javascript"> function x() { var qpt = "QualityPointTechnologies"; var pattern = new RegExp("POIiNT","i"); document.write(qpt.match(pattern)); } </script>
a) Error
b) POIiNT
c) Point
d) null
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27) How do you create a new object in JavaScript?
a) var obj = {};
b) var obj = Object();
c) var obj=new {};
d) None of the above
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28) In Javascript, What does isNaN function do ?
a) Return true if the argument is not a number.
b) Return false if the argument is not a number.
c) Return true if the argument is a number.
d) None of the above
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29) If x=103 & y=9 then x%=y , what is the value of x after executing x%=y?
a) 4
b) 3
c) 2
d) 5
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30) Choose the external object:
a) Date
b) Option
c) Layer
d) Checkbox
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31) Choose the four symbol pairs that represent RegExp properties lastMatch, lastParent, leftContext, and rightContext, respectively:
a) $&, $+, $`, $'
b) $+, $&, $', $`
c) $&, $~, $`, $'
d) $+, $&, $`, $'
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32) Which of the following properties hold the values of the pixels of the length of the width and height of the viewer's screen resolution?
a) screen.width and screen.height
b) Resolution.width and Resolution.height
c) screen.pixels.width and screen.pixels.height
d) ViewerScreen.width and ViewerScreen.height
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33) ParseInt(“15”,10)=?
a) 15
b) 10
c) 151
d) 150
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34) Which JavaScript feature uses JAR files?
a) Object signing
b) Style sheets
c) Netcaster channels
d) Image rollovers
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35)How to assign a function to a variable with the JavaScript Function contructor ?
a) var f=Function("x","y","return x+y");
b) var f=Function(x,y){ return x+y;}
c) var f= new Function("x", "y", "return x + y");
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36) In JavaScript, Window.alert() is used to allow user to enter something
a) True
b) False
c) None of above
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37) <script language="javascript"> function x() { var qpt = "We are fast growing Software Company located in Chennai, India."; var pattern = new RegExp("in","gi"); document.write(pattern.exec(qpt) + " "); document.write(pattern.exec(qpt) + " "); document.write(pattern.exec(qpt) + " "); } </script>
a) in in In
b) in in in
c) in in null
d) in null null
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38) Is Javascript has any date data type?
a) Yes
b) No
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39) Math. round(-20.5)=?
a) -21
b) 20
c) -20
d) 21
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40) ?_name is it valid javascript identifier?
a) Yes
b) No
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41) <script language="javascript"> function x() { var qpt = "First come, first served"; var pattern = /first/gi; document.write(qpt.match(pattern)[1]); } </script>
a) first
b) undefined
c) First
d) Error
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42) (a). // , /* ...... **/ (b). / , /** ......./ , /* (c). /*......*/ , // (d). \*......*\ , // In javascript, Which of the above Comments lines are used ?
a) Only (d)
b) Only (c)
c) Either (c) or (d)
d) Only (b)
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43) <script language="javascript"> function x() { var s = "Give 100%!{[!!"; var pattern = /\W/g; var output = s.match(pattern); document.write(output); } </script>
a) ,%,!,{,[,!,!
b) G,i,v,e,1,0,0
c) Give 100
d) Error
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44) Which best describes void?
a) A method
b) A function
c) A statement
d) An operator
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45) <script type="text/javascript" language="javascript"> var qpt="QualityPointTechnologies"; var result =qpt.lastIndexOf("l"); document.write(result); </script>
a) 3
b) 18
c) 17
d) 19
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46) <script language="javascript"> function x() { var qpt = "First come, first served"; var pattern = /first/g; document.write(qpt.match(pattern)[1]); } </script>
a) first
b) First
c) undefined
d) None of the above
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47) <script language="javascript"> function sum(x) { function add(y) { return x+y; } return add; } function callme() { result=sum(5)(5); alert(result); } </script> If you call the function callme(), what will happen ?
a) 10
b) Error in calling Function
c) 5
d) None of the above
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48) Who invented the javascript programming language?
a) Tennis Ritchie
b) James Gosling
c) Brendan Eich
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49) <script type="text/javascript"> document.write("<h1>This is a heading</h1>"); document.write("<p>This is a paragraph.</p>"); document.write("<p>This is another paragraph.</p>"); </script> Can you write HTML tag inside the javascript ?
a) No
b) Yes
c) Impossible
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50) Which feature is supported in MSIE 3.x?
a) split()
b) document.clear()
c) join()
d) charAt()
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51) How to speicfy the color of the hypertext links with JavaScript ?
a) document.linkColor="#00FF00";
b) document.LColor="#00FF00";
c) document.LinkC="#00FF00";
d) document.hyperTextLink="#00FF00":
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52) <script language="javascript"> function x() { var qpt = "QualityPointTechnologies"; var pattern = /point/; var output= qpt.search(pattern); document.write("Position: " + output); } </script>
a) Position-7
b) Position-1
c) null
d) error
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53) --------------- method returns the number of milliseconds in a date string.
a) setHours()
b) setMinutes()
c) parse()
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54) ------------- converts a string to floating point numbers.
a) eval
b) ParseInt
c) ParseFloat
d) None
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55) ---------------------- attempts to evaluate a string representing any javascript literals or variables, converting it to a number.
a) eval
b) parseFloat
c) parseInt
d) None
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56) Which is not an attribute of the cookie property?
a) path
b) host
c) secure
d) domain
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57) How do substring() and substr() differ?
a) One is not a method of the String object.
b) substr() takes three arguments, substring() only two.
c) Only one accepts a desired string length as an argument.
d) Besides the spelling, nothing.
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58) Which is not a reserved word?
a) interface
b) short
c) program
d) throws
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59) In Javascript, Which of the following method is used to find out the character at a position in a string?
a) charAt()
b) CharacterAt()
c) CharPos()
d) characAt()
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60) <script type="text/javascript" language="javascript"> var qpt = "QualityPointTechnologies"; var result =qpt.substring(7,8); document.write(result); </script>
a) Po
b) yP
c) oi
d) P
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61) How do you delete an element from an options array?
a) Set it to false.
b) Set it to null.
c) Set it to undefined.
d) Set it to -1
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62) Is javaScript case sensitive ?
a) Yes
b) No
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63) JavaScript RegExp Object has modifier 'i' to __________
a) Perform case-sensitive matching
b) Perform case-insensitive matching
c) Perform both case-sensitive&case-insensitive matching
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64) What are the following looping structures are available in javascripts?
a) for,forecach
b) foreach,whileloop
c) do-while loop,foreach
d) for , while loop
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65) Which of these is not a method of the Math object?
a) atan()
b) atan2()
c) eval()
d) acos()
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66) <script type="text/javascript"> var s = "9123456 or 80000?"; var pattern = /\d{4}/; var output = s.match(pattern); document.write(output); </script>
a) 9123
b) 91234
c) 80000
d) None of the above
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67) In javascript, RegExp Object Method test() is used to search a string and returns _________
a) true or false
b) found value
c) index
d) None of the above
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68) What property would you use to redirect a visitor to another page?
a) document.URL
b) window.location.href
c) .document.location.href
d) link.href
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69) a.) var qpt="Quality Point Technologies"; b.) var qpt=new String("Quality Point Technologies"); Question: In javascript, which of the above statement can used for string declaration ?
a) Either (a) or (b)
b) Only (a)
c) Neither (a) nor (b)
d) Only (b)
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70) <script type="text/javascript" language="javascript"> var qpt = "QualityPointTechnologies"; var result =qpt.indexOf("Tech"); document.write(result); </script>
a) 11
b) 12
c) 15
d) 13
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71) <script language="javascript"> function x() { var s = "Eat to live, but do not live to eat"; var pattern = new RegExp("eat$"); document.write(pattern.exec(s)); } </script>
a) Eat
b) eat
c) undefined
d) Eat eat
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72) <script language="javascript"> function x() { var qpt = "We are fast growing Software Company located in Chennai, India."; var pattern = new RegExp("in","g"); document.write(pattern.exec(qpt) + " "); document.write(pattern.exec(qpt) + " "); document.write(pattern.exec(qpt) + " "); } </script>
a) in in In
b) in in in
c) in in null
d) in null null
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73) -------------- method is used to remove focus from the specified object.
a) blur()
b) focus()
c) None
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74) parseFloat(“FF2”)=?
a) 152
b) FF2
c) NaN
d) None
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75)eval((20*4)=?
a) Nan
b) 204
c) 24
d) 80
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76)<script language="javascript"> function x() { var qpt = "QualityPointTechnologies"; var pattern = new RegExp("TECHNOLOGIES","i"); document.write(qpt.match(pattern)); } </script>
a) null
b) Technologies
c) TECHNOLOGIES
d) Error
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77)Javascript is a ________ typed language.
a) tightly
b) loosely
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Answers
(1) a	(2) c	(3) a	(4) a	(5) a	(6) a	(7) c	(8) c	(9) c	(10) d
(11) a	(12) c	(13) b	(14) a	(15) a	(16) b	(17) b	(18) b	(19) c	(20) c
(21) d	(22) a	(23) a	(24) b	(25) b	(26) d	(27) a	(28) a	(29) a	(30) d
(31) a	(32) a	(33) a	(34) a	(35) c	(36) b	(37) a	(38) b	(39) c	(40) b
(41) a	(42) b	(43) a	(44) d	(45) b	(46) c	(47) a	(48) c	(49) b	(50) d
(51) a	(52) b	(53) c	(54) c	(55) a	(56) b	(57) c	(58) c	(59) a	(60) d
(61) b	(62) a	(63) b	(64) d	(65) c	(66) a	(67) a	(68) b	(69) a	(70) b
(71) b	(72) c	(73) a	(74) c	(75) d	(76) b	(77) b