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JavaScript Multiple Choice Questions and Answers – Lexical Structure | Javascript Online Quiz & MCQ

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Free download in PDF Javascript Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) The web development environment (JavaScript) offers which standard construct for data validation of the input entered by the user.
[A] Controlled loop constructs
[B] Server page access
[C] Client side Event
[D] Permit server-side
Answer: Controlled loop constructs
(2) The main purpose of a “Live Wire” in NetScape is to ________
[A] Create linkage between client side and server side
[B] Permit server side, JavaScript code, to connect to RDBMS
[C] Support only non relational database
[D] To interpret JavaScript code
Answer: Permit server side, JavaScript code, to connect to RDBMS

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(3) The script tag must be placed in __________
[A] the head tag
[B] the head or body
[C] the title or head
[D] after the body tag
Answer: the head or body
(4) A JavaScript program developed on a Unix Machine ________
[A] will throw errors and exceptions
[B] must be restricted to a Unix Machine only
[C] will work perfectly well on a Windows Machine
[D] will be displayed as a JavaScript text on the browser
Answer: will work perfectly well on a Windows Machine
(5) JavaScript is ideal to ________
[A] make computations in HTML simpler
[B] minimize storage requirements on the web server
[C] increase the download time for the client
[D] increase the loading time of the website
Answer: minimize storage requirements on the web server
(6) Which attribute is used to specify that the script is executed when the page has finished parsing? (only for external scripts)
[A] parse
[B] a sync
[C] defer
[D] type
Answer: defer
(7) JavaScript Code can be called by using ____________
[A] RMI
[B] Triggering Event
[C] Preprocessor
[D] Function/Method
Answer: Function/Method
(8) JavaScript can be written __________
[A] directly into JS file and included into HTML
[B] directly on the server page
[C] directly into HTML pages
[D] directly into the css file
Answer: directly into JS file and included into HTML
(9) Which of the following Attribute is used to include External JS code inside your HTML Document?
[A] src
[B] ext
[C] script
[D] link
Answer: src
(10) A proper scripting language is a __________
[A] High level programming language
[B] Assembly level programming language
[C] Machine level programming language
[D] Low level programming language
Answer: High level programming language
(11) What will be the output of the following JavaScript code?

[A] good day
[B] goodday
[B] error
[B] undefined
Answer: goodday
(12) What will be the output of the following JavaScript code?

[A] 0
[B] 1
[C] 2
[D] 5
Answer: 1
(13) What will be the output of the following JavaScript code?

[A] 5
[B] 10
[C] 50
[D] Error
Answer: 50
(14) What will be the output of the following JavaScript code?

[A] onetwo
[B] one two
[C] error
[D] undefined
Answer: onetwo
(15) What will be the output of the following JavaScript code?

[A] integer
[B] number
[C] string
[D] error
Answer: string

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