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Javascript Multiple Choice Questions Highlights
– These MCQs are organized chapter wise & easy Chapter is further organized topic wise.
– Every MCQ set focuses on a specific topic of a given Chapter in JavaScript Subject
– 50+ Multiple Choice Questions & Answers (MCQs) in Javascript with a detaileds.
JavaScript Multiple Choice Questions:
Below are the list of top 50+ JavaScript multiple choice questions and answers for freshers beginners.
- Why so JavaScript and Java have similar name?
A. JavaScript is a stripped-down version of Java
B. JavaScript’s syntax is loosely based on Java’s
C. They both originated on the island of Java
D. None of the above
Ans: B When a user views a page containing a JavaScript program, which machine actually executes the script?
A. The User’s machine running a Web browser
B. The Web server
C. A central machine deep within Netscape’s corporate offices
D. None of the above
Ans: A______ JavaScript is also called client-side JavaScript.
A. Microsoft
B. Navigator
C. LiveWire
D. Native
Ans: B__________ JavaScript is also called server-side JavaScript.
A. Microsoft
B. Navigator
C. LiveWire
D. Native
Ans: CWhat are variables used for in JavaScript Programs?
A. Storing numbers, dates, or other values
B. Varying randomly
C. Causing high-school algebra flashbacks
D. None of the above
Ans: A_____ JavaScript statements embedded in an HTML page can respond to user events such as mouse-clicks, form input, and page navigation.
A. Client-side
B. Server-side
C. Local
D. Native
Ans: AWhat should appear at the very end of your JavaScript?
The <script LANGUAGE=”JavaScript”>tag
A. The </script>
B. The <script>
C. The END statement
D. None of the above
Ans: AWhich of the following can’t be done with client-side JavaScript?
A. Validating a form
B. Sending a form’s contents by email
C. Storing the form’s contents to a database file on the server
D. None of the above
Ans: CWhich of the following are capabilities of functions in JavaScript?
A. Return a value
B. Accept parameters and Return a value
C. Accept parameters
D. None of the above
Ans: CWhich of the following is not a valid JavaScript variable name?
A. 2names
B. _first_and_last_names
C. FirstAndLast
D. None of the above
Ans: A______ tag is an extension to HTML that can enclose any number of JavaScript statements.
A. <SCRIPT>
B. <BODY>
C. <HEAD>
D. <TITLE>
Ans: AHow does JavaScript store dates in a date object?
A. The number of milliseconds since January 1st, 1970
B. The number of days since January 1st, 1900
C. The number of seconds since Netscape’s public stock offering.
D. None of the above
Ans: AWhich of the following attribute can hold the JavaScript version?
A. LANGUAGE
B. SCRIPT
C. VERSION
D. None of the above
Ans: AWhat is the correct JavaScript syntax to write “Hello World”?
A. System.out.println(“Hello World”)
B. println (“Hello World”)
C. document.write(“Hello World”)
D. response.write(“Hello World”)
Ans: CWhich of the following way can be used to indicate the LANGUAGE attribute?
A. <LANGUAGE=”JavaScriptVersion”>
B. <SCRIPT LANGUAGE=”JavaScriptVersion”>
C. <SCRIPT LANGUAGE=”JavaScriptVersion”> JavaScript statements…</SCRIPT>
D. <SCRIPT LANGUAGE=”JavaScriptVersion”!> JavaScript statements…</SCRIPT>
Ans: CInside which HTML element do we put the JavaScript?
A. <js>
B. <scripting>
C. <script>
D. <javascript>
Ans: CWhat is the correct syntax for referring to an external script called ” abc.js”?
A. <script href=” abc.js”>
B. <script name=” abc.js”>
C. <script src=” abc.js”>
D. None of the above
Ans: CWhich types of image maps can be used with JavaScript?
A. Server-side image maps
B. Client-side image maps
C. Server-side image maps and Client-side image maps
D. None of the above
Ans: BWhich of the following navigator object properties is the same in both Netscape and IE?
A. navigator.appCodeName
B. navigator.appName
C. navigator.appVersion
D. None of the above
Ans: AWhich is the correct way to write a JavaScript array?
A. var txt = new Array(1:”tim”,2:”kim”,3:”jim”)
B. var txt = new Array:1=(“tim”)2=(“kim”)3=(“jim”)
C. var txt = new Array(“tim”,”kim”,”jim”)
D. var txt = new Array=”tim”,”kim”,”jim”
Ans: CWhat does the <noscript> tag do?
A. Enclose text to be displayed by non-JavaScript browsers.
B. Prevents scripts on the page from executing.
C. Describes certain low-budget movies.
D. None of the above
Ans: AIf para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?
A. “New Text”?
B. para1.value=”New Text”;
C. para1.firstChild.nodeValue= “New Text”;
D. para1.nodeValue=”New Text”;
Ans: BJavaScript entities start with _______ and end with _________.
A. Semicolon, colon
B. Semicolon, Ampersand
C. Ampersand, colon
D. Ampersand, semicolon
Ans: DWhich of the following best describes JavaScript?
A. a low-level programming language.
B. a scripting language precompiled in the browser.
C. a compiled scripting language.
D. an object-oriented scripting language.
Ans: DChoose the server-side JavaScript object?
A. FileUpLoad
B. Function
C. File
D. Date
Ans: CChoose the client-side JavaScript object?
A. Database
B. Cursor
C. Client
D. FileUpLoad
Ans: DWhich of the following is not considered a JavaScript operator?
A. new
B. this
C. delete
D. typeof
Ans: B______method evaluates a string of JavaScript code in the context of the specified object.
A. Eval
B. ParseInt
C. ParseFloat
D. Efloat
Ans: AWhich of the following event fires when the form element loses the focus: <button>, <input>, <label>, <select>, <textarea>?
A. onfocus
B. onblur
C. onclick
D. ondblclick
Ans: BThe syntax of Eval is ________________
A. [objectName.]eval(numeriC.
B. [objectName.]eval(string)
C. [EvalName.]eval(string)
D. [EvalName.]eval(numeriC.
Ans: BJavaScript is interpreted by _________
A. Client
B. Server
C. Object
D. None of the above
Ans: AUsing _______ statement is how you test for a specific condition.
A. Select
B. If
C. Switch
D. For
Ans: BWhich of the following is the structure of an if statement?
A. if (conditional expression is true) thenexecute this codeend if
B. if (conditional expression is true)execute this codeend if
C. if (conditional expression is true) {then execute this code>->}
D. if (conditional expression is true) then {execute this code}
Ans: CHow to create a Date object in JavaScript?
A. dateObjectName = new Date([parameters])
B. dateObjectName.new Date([parameters])
C. dateObjectName := new Date([parameters])
D. dateObjectName Date([parameters])
Ans: AThe _______ method of an Array object adds and/or removes elements from an array.
A. Reverse
B. Shift
C. Slice
D. Splice
Ans: DTo set up the window to capture all Click events, we use which of the following statement?
A. window.captureEvents(Event.CLICK);
B. window.handleEvents (Event.CLICK);
C. window.routeEvents(Event.CLICK );
D. window.raiseEvents(Event.CLICK );
Ans: AWhich tag(s) can handle mouse events in Netscape?
A. <IMG>
B. <A>
C. <BR>
D. None of the above
Ans: B____________ is the tainted property of a window object.
A. Pathname
B. Protocol
C. Defaultstatus
D. Host
Ans: CTo enable data tainting, the end user sets the _________ environment variable.
A. ENABLE_TAINT
B. MS_ENABLE_TAINT
C. NS_ENABLE_TAINT
D. ENABLE_TAINT_NS
Ans: CIn JavaScript, _________ is an object of the target language data type that encloses an object of the source language.
A. a wrapper
B. a link
C. a cursor
D. a form
Ans: AWhen a JavaScript object is sent to Java, the runtime engine creates a Java wrapper of type ___________
A. ScriptObject
B. JSObject
C. JavaObject
D. Jobject
Ans: B_______ class provides an interface for invoking JavaScript methods and examining JavaScript properties.
A. ScriptObject
B. JSObject
C. JavaObject
D. Jobject
Ans: B_________ is a wrapped Java array, accessed from within JavaScript code.
A. JavaArray
B. JavaClass
C. JavaObject
D. JavaPackage
Ans: AA ________ object is a reference to one of the classes in a Java package, such as netscape.javascript .
A. JavaArray
B. JavaClass
C. JavaObject
D. JavaPackage
Ans: BThe JavaScript exception is available to the Java code as an instance of __________
A. netscape.javascript.JSObject
B. netscape.javascript.JSException
C. netscape.plugin.JSException
D. None of the above
Ans: BTo automatically open the console when a JavaScript error occurs which of the following is added to prefs.js?
A. user_pref(” javascript.console.open_on_error”, false);
B. user_pref(“javascript.console.open_error “, true);
C. user_pref(“javascript.console.open_error “, false);
D. user_pref(“javascript.console.open_on_error”, true);
Ans: DTo open a dialog box each time an error occurs, which of the following is added to prefs.js?
A. user_pref(“javascript.classic.error_alerts”, true);
B. user_pref(“javascript.classic.error_alerts “, false);
C. user_pref(“javascript.console.open_on_error “, true);
D. user_pref(“javascript.console.open_on_error “, false);
Ans: AThe syntax of a blur method in a button object is ______________
A. Blur()
B. Blur(contrast)
C. Blur(value)
D. Blur(depth)
Ans: AThe syntax of capture events method for document object is ______________
A. captureEvents()
B. captureEvents(args eventType)
C. captureEvents(eventType)
D. captureEvents(eventVal)
Ans: CThe syntax of close method for document object is ______________
A. Close(doC.
B. Close(object)
C. Close(val)
D. Close()
Ans: D<script type=”text/javascript”>
x=4+”4″;
document.write(x);
</script>
Output——?
A. 44
B. 8
C. 4
D. Error output
Ans: A
- Is it possible to nest functions in JavaScript?
A. True
B. False
Ans: A <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
Ans: AScripting language are
A. High Level Programming language
B. Assembly Level programming language
C. Machine level programming language
Ans: AWhich 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.
Ans: CChoose the client-side JavaScript object:
A. Database
B. Cursor
C. Client
D. FileUpLoad
Ans: DWhat 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
Ans: AIn JavaScript, Window.prompt() method return true or false value ?
A. False
B. True
Ans: A
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