can be said with strong emphasis.
element in bold.
HTML MCQs.
) is used to display the underlined text.
HyperText Markup Language .
b) Minidata
c) Macrodata
d) Microdata
View Answer
Answer: d
Explanation: The Microdata spec provides a standardized syntax for additional semantic
markup to your web pages to enhance the machine readability of your web pages. The
planning for distribution center operation is offered by minidata. Macrodata and
Modifydata are not any terms related to HTML5.
44. Which HTML element is used for YouTube videos?
a)
. The HTML canvas
c.
a.
Answer: (b)
13. What is the correct way in which we can start an ordered list that has the numeric
value count of 5?
a.
<br />d. <html>
<br />Answer: (d) <html>
<br />15. Which HTML tag do we use for displaying the power in the expression, (x² – y²)?
<br />a.
<br />b. <sub>
<br />c. <sup>
<br />d. None of the above
<br />Answer: (c) <sup>
<br />16. In HTML, the correct way of commenting out something would be using:
<br />a. ## and #
<br /></div> <hr /><div id="page18-div" >
<br />b.
<br />c. </– and -/->
<br />d.
<br />Answer: (b)
<br />17. How does the <bdo> element work?
<br />a. changes direction of the ltr text
<br />b. override the direction of the rtl text
<br />c. stops writing in current direction of text
<br />d. override the text direction
<br />Answer: (d) override the text direction
<br />18. What attribute do we use for data binding?
<br />a. datasrc
<br />b. mayscript
<br />c. name
<br />d. datafld
<br />Answer: (a) datasrc
<br />19. The non-ASCII characters would be replaced with ________ by the process of URL
<br />encoding.
<br />a. “+”
<br />b. “%”
<br />c. “&”
<br />d. “*”
<br />Answer: (b) “%”
<br /></div> <hr /><div id="page19-div" >
<br />20. Which of these entities is not defined in the XML?
<br />a. apos
<br />b. quot
<br />c. copy
<br />d. gt
<br />Answer: (c) copy
<br />21. The ____________ entity is used for the arrow.
<br />a. &zeta
<br />b. &crarr
<br />c. &oelig
<br />d. &upsih
<br />Answer: (b) &crarr
<br />22. Which of these doesn’t support the MP3 format?
<br />a. Opera
<br />b. Safari
<br />c. Chrome
<br />d. Firefox
<br />Answer: (a) Opera
<br />23. Which one of these helps us test if an old browser supports the geolocation?
<br />a. Modernizr.geolocation
<br />b. Modernizr
<br />c. Modernizr.js
<br /></div> <hr /><div id="page20-div" >
<br />d. Navigator.userAgent
<br />Answer: (d) Navigator.userAgent
<br />24. Which of these classes helps make a text stand out?
<br />a. .small
<br />b. .lead
<br />c. .text-center
<br />d. .text-left
<br />Answer: (b) .lead
<br />25. What do we call after initializing a plug-in to get A scripting interface?
<br />a. NP_GetMIMEDescription
<br />b. NP_Initialize
<br />c. NPP_GetValue
<br />d. NP_GetValue
<br />Answer: (c) NPP_GetValue
<br />CSS MULTIPLE CHOICE
<br />1. What is CSS?
<br />a) CSS is a style sheet language
<br />b) CSS is designed to separate the presentation and content, including layout, colors, and
<br />fonts
<br />c) CSS is the language used to style the HTML documents
<br />d) All of the mentioned
<br />View Answer
<br />Answer: d
<br />Explanation: CSS is a style sheet language that stands for Cascading Style Sheet and is
<br />used to style HTML documents. CSS is mainly designed to separate the presentation and
<br />content, including layout, colors, and fonts.
<br /></div> <hr /><div id="page21-div" >
<br />ADVERTISEMENT
<br />ADVERTISEMENT
<br />2. Which of the following tag is used to embed css in html page?
<br />a) <css>
<br />b)
<br />c) <script>
<br />d) tag is used to embed CSS in HTML page, while <script>
<br /></script> is used to embed JS in HTML. is HTML5 declaration.
<br />3. Which of the following CSS selectors are used to specify a group of elements?
<br />a) tag
<br />b) id
<br />c) class
<br />d) both class and tag
<br />View Answer
<br />Answer: c
<br />Explanation: Class selectors are used to specify a group of elements. Id selector
<br />specifies a particular unique element.
<br />4. Which of the following has introduced text, list, box, margin, border, color, and
<br />background properties?
<br />a) HTML
<br />b) PHP
<br />c) CSS
<br />d) Ajax
<br />View Answer
<br />Answer: c
<br />Explanation: CSS is a style sheet language that stands for Cascading Style Sheet. CSS
<br />has introduced text, list, box, margin, border, color, and background properties.
<br />5. Which of the following CSS framework is used to create a responsive design?
<br />a) django
<br />b) rails
<br />c) larawell
<br />d) bootstrap
<br />View Answer
<br />Answer: d
<br />Explanation: Bootstrap is a free and open-source collection of tools for creating websites
<br />and web applications. It contains HTML- and CSS-based design templates for typography,
<br />forms, buttons, navigation and other interface components, as well as optional
<br /></div> <hr /><div id="page22-div" >
<br />JavaScript extensions. It aims to ease the development of dynamic websites and web
<br />applications.
<br />advertisement
<br />6. Which of the following CSS selector is used to specify a rule to bind a particular unique
<br />element?
<br />a) tag
<br />b) id
<br />c) class
<br />d) both class and tag
<br />View Answer
<br />Answer: b
<br />Explanation: For binding a particular unique element, id selectors are used. While for a
<br />group of elements, class selector can be used.
<br />7. Which of the following type of HTML tag is used to define an internal style sheet?
<br />a) <script>
<br />b) <link>
<br />c) <class>
<br />d) <hr /><div id="page23-div" >
<br />View Answer
<br />Answer: a
<br />Explanation: Output of the above code snippet won’t happen as the declaration syntax is
<br />wrong. The correct declaration is : h1 { color: green; } which will yield an output. In CSS,
<br />we don’t write the value in double quotes.
<br />10. Which of the following CSS style property is used to specify an italic text?
<br />a) style
<br />b) font
<br />c) font-style
<br />d) @font-face
<br />View Answer
<br />Answer: c
<br />Explanation: font-style property is used to specify an italic text. font-style property has
<br />three values (normal, italic & oblique).
<br />11. What will be the output of following CSS code snippet?
<br />h1 {color: red text-decoration: underline; font-style: italic;}
<br />a) color: red, text-decoration: underline works
<br />b) only font-style: italic works
<br />c) color: red, text-decoration: underline and font-style: italic all works
<br />d) text-decoration: underline and font-style: italic works
<br />View Answer
<br />Answer: b
<br />Explanation: In this case, we should see the browser continue to parse the value of color
<br />as “ red text-decoration: underline ” before it sees a closing semicolon. The font-style
<br />property that follows would then be used. Because the color property has an illegal value,
<br />it should be ignored.
<br />advertisement
<br />12. Which of the following are the CSS Extension Prefixes for Webkit?
<br />a) -chrome
<br />b) -web
<br />c) -o-
<br />d) -webkit
<br />View Answer
<br />Answer: d
<br />Explanation: Browser sometimes adds prefixes to non-standard CSS properties. CSS
<br />Extension prefix for Webkit is -webkit which is supported by almost all ios browsers. -o is
<br />used by opera where as -moz is used by firefox browser.
<br />13. Which of the following is the correct syntax to link an external style sheet in the HTML
<br /></div> <hr /><div id="page24-div" >
<br />file?
<br />a) <link rel=”stylesheet” href=”style.css” />
<br />b) <link rel=”stylesheet” src=”style.css” />
<br />c) <hr /><div id="page25-div" >
<br />Answer: c
<br />Explanation: The border-image-source property specifies the path to the image to be
<br />used as a border (instead of the normal border around an element).
<br />17. Which of the following CSS property defines the different properties of all four sides
<br />of an element’s border in a single declaration?
<br />a) border-collapse
<br />b) border-width
<br />c) padding
<br />d) border
<br />View Answer
<br />Answer: b
<br />Explanation: The border-width property sets the width of an element’s four borders. This
<br />property can have from one to four values.
<br />18. Which of the following is the correct way to apply CSS Styles?
<br />a) in an external CSS file
<br />b) inside an HTML element
<br />c) inside the <head> section of an HTML page
<br />d) all of the mentioned
<br />View Answer
<br />Answer: d
<br />Explanation: We can style the document using CSS in three different ways i.e embed,
<br />inline and external. An inline CSS means applying styles rules directly to the HTML
<br />element. In embed, we declare or write all the needed style in tag in the
<br />head section of the HTML document. We can create an external style sheet and provide
<br />its link to the document.
<br />19. Which of the following CSS property sets the font size of text?
<br />a) font-size
<br />b) text-size
<br />c) text
<br />d) size
<br />View Answer
<br />Answer: a
<br />Explanation: CSS Syntax:
<br />font-size: length | percentage | larger | smaller | xx-small | x-small |
<br />small | medium | large | x-large | xx-larger | inherit
<br />20. Which of the following is not the property of the CSS box model?
<br />a) margin
<br />b) color
<br />c) width
<br />d) height
<br />View Answer
<br /></div> <hr /><div id="page26-div" >
<br />Answer: b
<br />Explanation: CSS box model include height, width, padding, margin and border. All
<br />text-fields have complete support for every property related to CSS box model. Browser
<br />relies on system default styles when displaying these widgets.
<br />21. Which of the following CSS property sets what kind of line decorations are added to
<br />an element, such as underlines, overlines, etc?
<br />a) text-decoration
<br />b) text-style
<br />c) text-decoration-line
<br />d) text-line
<br />View Answer
<br />Answer: c
<br />Explanation: The text-decoration-line property defines the type of line decorations that
<br />are added to an element, such as underlines, overlines, etc.
<br />22. Which of the following CSS property specifies the look and design of an outline?
<br />a) outline-style
<br />b) outline-format
<br />c) outline-font
<br />d) none of the mentioned
<br />View Answer
<br />Answer: a
<br />Explanation: The outline-style CSS property is used to set the style of the outline of an
<br />element. An outline is a line that is drawn around elements, outside the border edge, to
<br />make the element stand out.
<br />23. What will be the output of the following CSS code snippet?
<br />span {
<br />border: 1px solid red;
<br />outline: green dotted thick;
<br />}
<br />a) All span elements will have a green thick border and a red outline
<br />b) All span elements will have a red border and a green dotted outline
<br />c) All span elements will have a outer green dotted border and an inner red border
<br />d) All span elements will have an outer red border and inner green dotted border
<br />View Answer
<br />Answer: c
<br />Explanation: The border property creates the inner border, while the outline sets the outer
<br />border.
<br />24. Which of the following CSS property sets the shadow for a box element?
<br />a) set-shadow
<br /></div> <hr /><div id="page27-div" >
<br />b) box-shadow
<br />c) shadow
<br />d) canvas-shadow
<br />View Answer
<br />Answer: b
<br />Explanation: box-shadow property sets the shadow for a box element.
<br />CSS Syntax:
<br />box-shadow: none | inherit
<br />25. Which of the following CSS property is used to set the color of the text?
<br />a) text-decoration
<br />b) pallet
<br />c) colour
<br />d) color
<br />View Answer
<br />Answer: d
<br />Explanation: The color property is used to set the color of the text. In CSS, colors can also
<br />be specified using RGB values, RGBA values, HSL values, HEX values, etc.
<br />26. Which of the following CSS Property controls how an element is positioned?
<br />a) static
<br />b) position
<br />c) fix
<br />d) set
<br />View Answer
<br />Answer: b
<br />Explanation: Position property controls how an element is positioned. When set to
<br />absolute or fixed, the element is removed completely from the normal flow of the
<br />document. When set to relative, the element is moved relative to its position in the
<br />normal flow, but a space is left where it would normally have been. The default value,
<br />static, means the element remains in the normal flow and is not positioned.
<br />27. Which of the following CSS selector selects the elements that are checked?
<br />a) :checked
<br />b) E ~ F
<br />c) ::after
<br />d) none of the mentioned
<br />View Answer
<br />Answer: a
<br />Explanation: :checked selector selects the elements that are checked.
<br />Example: :checked {color: blue;}
<br />28. Which of the following is an appropriate value for the overflow element?
<br />a) scroll
<br /></div> <hr /><div id="page28-div" >
<br />b) hidden
<br />c) auto
<br />d) all of the mentioned
<br />View Answer
<br />Answer: d
<br />Explanation: Overflow of a div or a container can have the following values:
<br />visible|hidden|scroll|auto|initial|inherit
<br />29. Which of the following CSS property is used to specify table borders in CSS?
<br />a) table:border
<br />b) table
<br />c) border
<br />d) none of the mentioned
<br />View Answer
<br />Answer: c
<br />Explanation: In CSS, border property is used to specify table borders.
<br />Example:
<br />table{border: 7px solid black;}
<br />30. Which of the following property is used to align the text in a table?
<br />a) text-align
<br />b) align
<br />c) text
<br />d) none of the mentioned
<br />View Answer
<br />Answer: a
<br />Explanation: In CSS, text-align property is used to align the text in a table.
<br />Example:
<br />table{text-align: left;}
<br />31. Which of the following CSS Property sets the stacking order of positioned elements?
<br />a) y-index
<br />b) z-index
<br />c) x-index
<br />d) all of the mentioned
<br />View Answer
<br />Answer: b
<br />Explanation: z-index property sets the stacking order of positioned elements.
<br />Syntax:
<br />z-index: auto|number|initial|inherit;
<br />32. What will be the output of the following CSS code?
<br />div {
<br /></div> <hr /><div id="page29-div" >
<br />border-width:5px;
<br />border-style:dotted solid double dashed;
<br />}
<br />a) Box having dotted bottom outline, solid right outline, double top outline and dashed left
<br />outline
<br />b) Box having dotted bottom outline, solid left outline, double top outline and dashed left
<br />outline
<br />c) Box having dotted top outline, solid right outline, double bottom outline and dashed left
<br />outline
<br />d) Box having dotted top outline, solid left outline, double bottom outline and dashed right
<br />outline
<br />View Answer
<br />Answer: c
<br />Explanation: The shorthand run in clockwise direction.
<br />33. Which of the following property allows a marquee to be used in the case of a
<br />text-overflow?
<br />a) overflow-marquee
<br />b) overflow-style
<br />c) overflow-text
<br />d) none of the mentioned
<br />View Answer
<br />Answer: b
<br />Explanation: overflow-style is a CSS property that allows a marquee to be used in the
<br />case of a text-overflow.
<br />Syntax:
<br />overflow-style: auto | marquee-block
<br />34. Which of the following CSS property defines the space between cells in a table?
<br />a) border-spacing
<br />b) border-style
<br />c) border
<br />d) none of the mentioned
<br />View Answer
<br />Answer: a
<br />Explanation: border-spacing property defines the space between cells in a table.
<br />Syntax:
<br />border-spacing: non-negative length(s) | inherit
<br />35. Which of the following CSS3 property can be used to allow line breaks within words?
<br />a) line-break
<br />b) line-wrap
<br />c) word-wrap
<br />d) word-break
<br /></div> <hr /><div id="page30-div" >
<br />View Answer
<br />Answer: d
<br />Explanation: word-break property can be used to allow line breaks within the words.
<br />Syntax
<br />JavaScript MULTIPLE CHOICE
<br />1. What is JavaScript?
<br />a) JavaScript is a scripting language used to make the website interactive
<br />b) JavaScript is an assembly language used to make the website interactive
<br />c) JavaScript is a compiled language used to make the website interactive
<br />d) None of the mentioned
<br />View Answer
<br />Answer: a
<br />Explanation: JavaScript is a scripting language used along with HTML and CSS to make
<br />the website interactive along. It is used both on the client-side and server-side.
<br />ADVERTISEMENT
<br />ADVERTISEMENT
<br />2. Which of the following is correct about JavaScript?
<br />a) JavaScript is an Object-Based language
<br />b) JavaScript is Assembly-language
<br />c) JavaScript is an Object-Oriented language
<br />d) JavaScript is a High-level language
<br />View Answer
<br />Answer: a
<br />Explanation: Although JavaScript is not an OOP (Object-Oriented Programming) language
<br />like Java or PHP, it is object based language. The standard threesome of polymorphism,
<br />encapsulation, and inheritance are the criteria for object orientation, and JavaScript fails
<br />to meet them.
<br />3. Among the given statements, which statement defines closures in JavaScript?
<br />a) JavaScript is a function that is enclosed with references to its inner function scope
<br />b) JavaScript is a function that is enclosed with references to its lexical environment
<br />c) JavaScript is a function that is enclosed with the object to its inner function scope
<br />d) None of the mentioned
<br />View Answer
<br />Answer: b
<br />Explanation: A closure is a function that is enclosed with references to its lexical
<br />environment. A closure allows an inner function to access the scope of an outside
<br /></div> <hr /><div id="page31-div" >
<br />function. Closures are formed every time a function is created in JavaScript, during
<br />function creation time.
<br />4. What will be the output of the following JavaScript code snippet?
<br />var txt1 = "Sanfoundry_";
<br />var txt2 = "Javascriptmcq";
<br />document.getElementById("demo").innerHTML = txt1 + txt2;
<br />a) error
<br />b) Sanfoundry_ Javascriptmcq
<br />c) undefined
<br />d) Sanfoundry_Javascriptmcq
<br />View Answer
<br />Answer: d
<br />Explanation: The + operator in javascript acts as a concatenation operator when used
<br />with string. The new string does not have any space between the two added strings.
<br />advertisement
<br />5. What will be the output of the following JavaScript code?
<br /><script>
<br />var js = 10;
<br />js *= 5;
<br />document.getElementById("demo").innerHTML = js;
<br /></script>
<br />a) 10
<br />b) 50
<br />c) 5
<br />d) Error
<br />View Answer
<br />Answer: b
<br />Explanation: The *= operator in javascript is a shorthand expression for the multiplication
<br />of a particular number. It is a combination of two operators * and = .
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<br />ADVERTISEMENT
<br />6. Arrays in JavaScript are defined by which of the following statements?
<br />a) It is an ordered list of values
<br />b) It is an ordered list of objects
<br />c) It is an ordered list of string
<br />d) It is an ordered list of functions
<br /></div> <hr /><div id="page32-div" >
<br />View Answer
<br />Answer: a
<br />Explanation: An array in JavaScript is an ordered list of values, each value is referred to
<br />as an element, and it is identified by an index. An array can include values of many sorts
<br />and the length of an array dynamically sized.
<br />7. What will be the output of the following JavaScript code?
<br />// JavaScript Comparison Operators
<br />function compare()
<br />{
<br />int num=2;
<br />char b=2;
<br />if(a==b)
<br />return true;
<br />else
<br />return false;
<br />}
<br />a) false
<br />b) true
<br />c) compilation error
<br />d) runtime error
<br />View Answer
<br />Answer: b
<br />Explanation: The == in JS convert different types of operands to the same type before
<br />making the comparison. A strict comparison results in true value if the operands are of
<br />the same type and the contents match.
<br />8. What will be the output of the following JavaScript code snippet?
<br />advertisement
<br />// JavaScript Equalto Operators
<br />function equalto()
<br />{
<br />int num=10;
<br />if(num==="10")
<br />return true;
<br />else
<br />return false;
<br />}
<br />a) false
<br />b) true
<br />c) compilation error
<br /></div> <hr /><div id="page33-div" >
<br />d) runtime error
<br />View Answer
<br />Answer: a
<br />Explanation: A === operator in JS is only true if the operands are of the same type and
<br />the contents match. Two strings are strictly equal when they have the same sequence of
<br />characters, same length, and same characters in corresponding positions.
<br />9. Will the following JavaScript code work?
<br />var js = (function(x) {return x*x;}(10));
<br />a) Exception will be thrown
<br />b) Memory leak
<br />c) Error
<br />d) Yes, perfectly
<br />View Answer
<br />Answer: d
<br />Explanation: For functions expressed as expressions, the function name is optional in
<br />Javascript. Sometimes function expressions are defined and used right away.
<br />advertisement
<br />10. Which of the following is not javascript data types?
<br />a) Null type
<br />b) Undefined type
<br />c) Number type
<br />d) All of the mentioned
<br />View Answer
<br />Answer: d
<br />Explanation: JavaScript is a dynamic, loosely typed language. Variables in JavaScript
<br />aren’t tied to any specific value type, and each variable can be assigned and reassigned
<br />to values of all the types.
<br />11. Where is Client-side JavaScript code is embedded within HTML documents?
<br />a) A URL that uses the special javascript:code
<br />b) A URL that uses the special javascript:protocol
<br />c) A URL that uses the special javascript:encoding
<br />d) A URL that uses the special javascript:stack
<br />View Answer
<br />Answer: b
<br />Explanation: The Client-side JavaScript code is embedded within HTML documents in
<br />four ways :
<br />Inline, between a pair of “script” tags
<br />From an external file specified by the src attribute of a “script” tag
<br /></div> <hr /><div id="page34-div" >
<br />In an HTML event handler attribute, such as onclick or onmouseover
<br />In a URL that uses the special javascript: protocol.
<br />12. What will be the output of the following JavaScript code snippet?
<br />int a=1;
<br />if(a!=null) // JavaScript not equal to Operators
<br />return 1;
<br />else
<br />return 0;
<br />a) 0
<br />b) 1
<br />c) compiler error
<br />d) runtime error
<br />View Answer
<br />Answer: b
<br />Explanation: != is not equal to the operator in Javascript. It gives a value of 1 if the two
<br />values which are compared are not equal and give 0 if the two values are equal.
<br />13. Which of the following object is the main entry point to all client-side JavaScript
<br />features and APIs?
<br />a) Position
<br />b) Window
<br />c) Standard
<br />d) Location
<br />View Answer
<br />Answer: b
<br />Explanation: All client-side JavaScript features and APIs are accessed through the
<br />Window object. It represents a web browser window or frame, and the identifier window
<br />can be used to refer to it.
<br />14. What will be the output of the following JavaScript program?
<br />function sanfoundry(javascript)
<br />{
<br />return (javascript ? “yes” : “no”);
<br />}
<br />bool ans=true;
<br />console.log(sanfoundry(ans));
<br />a) Compilation error
<br />b) Runtime error
<br />c) Yes
<br />d) No
<br />View Answer
<br /></div> <hr /><div id="page35-div" >
<br />Answer: c
<br />Explanation: In javascript, “?” is called the ternary operator which is used for choosing
<br />one choice from the given two choices. It is used instead of if else statement and makes
<br />the code shorter.
<br />15. What will be the output of the following JavaScript code?
<br />// Javascript code snippet to compare the height
<br />function height()
<br />{
<br />var height = 123.56;
<br />var type = (height>=190) ? "tall" : "short";
<br />return type;
<br />}
<br />a) short
<br />b) 123.56
<br />c) tall
<br />d) 190
<br />View Answer
<br />Answer: a
<br />Explanation: The ternary operator in javascript is used as a comparison operator which
<br />works on three operands. The statement in the above code initializes type variable with
<br />the value short which is returned through the function.
<br />16. Which of the following can be used to call a JavaScript Code Snippet?
<br />a) Function/Method
<br />b) Preprocessor
<br />c) Triggering Event
<br />d) RMI
<br />View Answer
<br />Answer: a
<br />Explanation: A function call to the element on which JavaScript is to be run can be used
<br />to invoke JavaScript code. Other techniques include onclick, onload, and onsubmit,
<br />among others.
<br />17. What will be the output of the following JavaScript function?
<br /><script>
<br />function javascript()
<br />{
<br />// javacript abs() method
<br />document.getElementById("demo").innerHTML = Math.abs(-7.25);
<br />}
<br /></script>
<br /></div> <hr /><div id="page36-div" >
<br />a) -7.25
<br />b) 7.25
<br />c) -7
<br />d) 7
<br />View Answer
<br />Answer: b
<br />Explanation: The javacript abs() method returns the absolute value of a number. The
<br />method is found in the math library of Javascript.
<br />18. What will be the output of the following JavaScript code?
<br />var a=5 , b=1
<br />var obj = { a : 10 }
<br />// with keyword in JavaScript
<br />with(obj)
<br />{
<br />alert(b)
<br />}
<br />a) 1
<br />b) 10
<br />c) 5
<br />d) Error
<br />View Answer
<br />Answer: a
<br />Explanation: Firstly the interpreter checks obj for property b. But it doesn ’ t find any
<br />property b so it takes the value from outside the object within the JavaScript code
<br />snippet.
<br />19. Which of the following explains correctly what happens when a JavaScript program is
<br />developed on a Unix Machine?
<br />a) will work perfectly well on a Windows Machine
<br />b) will be displayed as JavaScript text on the browser
<br />c) will throw errors and exceptions
<br />d) must be restricted to a Unix Machine only
<br />View Answer
<br />Answer: a
<br />Explanation: Because JS can run on a variety of operating systems, an application written
<br />for UNIX will run just as well on Windows.
<br />20. Which is a more efficient JavaScript code snippet?
<br />Code 1 :
<br />// for loop in javascript
<br />for(var num=10;num>=1;num--)
<br /></div> <hr /><div id="page37-div" >
<br />{
<br />document.writeln(num);
<br />}
<br />Code 2 :
<br />var num=10;
<br />while(num>=1)
<br />{
<br />document.writeln(num);
<br />num++;
<br />}
<br />a) Code 1
<br />b) Code 2
<br />c) Both Code 1 and Code 2
<br />d) Cannot Compare
<br />View Answer
<br />Answer: a
<br />Explanation: Code 1 would be more efficient JS code. Infact second code will go into
<br />runtime error as the value of num will never reach less than or equal to one.
<br />21. What will be the output of the following JavaScript code?
<br />function printArray(a)
<br />{
<br />var len = a.length, i = 0;
<br />if (len == 0)
<br />console.log("Empty Array");
<br />else
<br />{
<br />// do-while loop in javascript
<br />do
<br />{
<br />console.log(a[i]);
<br />} while (++i < len);
<br />}
<br />}
<br />a) Prints “Empty Array”
<br />b) Prints 0 to the length of the array
<br />c) Prints the numbers in the array in order
<br />d) Prints the numbers in the array in the reverse order
<br />View Answer
<br />Answer: c
<br />Explanation: The do/while statement creates a loop that executes a block of javascript
<br /></div> <hr /><div id="page38-div" >
<br />code once, before checking if the condition is true, then it will repeat the loop as long as
<br />the condition is true. Hence the iterator traverses through the array and print them in
<br />normal order.
<br />22. What happens in the following JavaScript code snippet?
<br />var js = 0;
<br />while (js < 10)
<br />{
<br />console.log(js);
<br />js++;
<br />}
<br />a) An exception is thrown
<br />b) The values of js are logged or stored in a particular location or storage
<br />c) The value of js from 0 to 9 is displayed in the console
<br />d) An error is displayed
<br />View Answer
<br />Answer: c
<br />Explanation: In JavaScript, Console.log is a predefined function that accepts the value as
<br />an argument. At the time of code execution, console.log prints this value in the argument
<br />to the console.
<br />23. What will be the output of the following JavaScript code?
<br />function range(int javascript)
<br />{
<br />int a=5;
<br />for(int i=0;i<javascript;i++)
<br />{
<br />console.log(a);
<br />}
<br />}
<br />range(3);
<br />a) 2
<br />b) 5
<br />c) 555
<br />d) error
<br />View Answer
<br />Answer: c
<br />Explanation: for loop in Javascript first initializes the variable and later on checks for the
<br />condition expression and after that execute the line of statements. The value of iterator i
<br />increase until it reaches the value of length.
<br />24. Which of the following scoping type does JavaScript use?
<br />a) Sequential
<br /></div> <hr /><div id="page39-div" >
<br />b) Segmental
<br />c) Lexical
<br />d) Literal
<br />View Answer
<br />Answer: c
<br />Explanation: JavaScript, like most current programming languages, employs lexical
<br />scoping. This means that functions are performed with the variable scope in effect when
<br />they were defined, rather than the variable scope in effect when they are invoked.
<br />25. What is the basic difference between JavaScript and Java?
<br />a) Functions are considered as fields
<br />b) Functions are values, and there is no hard distinction between methods and fields
<br />c) Variables are specific
<br />d) There is no difference
<br />View Answer
<br />Answer: b
<br />Explanation: Java is an object-oriented programming language, while JS is an
<br />object-oriented scripting language. The main difference between JavaScript and Java is
<br />that functions are values, while methods and fields are not clearly defined.
<br />26. What will be the output of the following JavaScript code?
<br />var quiz=[1,2,3];
<br />var js=[6,7,8];
<br />var result=quiz.concat(js);
<br />document.writeln(result);
<br />a) 1, 2, 3, 6, 7, 8
<br />b) 123
<br />c) 1, 2, 3
<br />d) Error
<br />View Answer
<br />Answer: a
<br />Explanation: concat is a predefined function in the array library in Javascript. The concat
<br />function is used to combine the value of two arrays.
<br />i.e.1, 2, 3, 6, 7, 8
<br />27. Why JavaScript Engine is needed?
<br />a) Both Compiling & Interpreting the JavaScript
<br />b) Parsing the javascript
<br />c) Interpreting the JavaScript
<br />d) Compiling the JavaScript
<br />View Answer
<br />Answer: c
<br /></div> <hr /><div id="page40-div" >
<br />Explanation: For the most part, the JS Engine is used to interpret JavaScript. It’s used to
<br />parse javascript and run it on a web page.
<br />28. What will be the function of the following JavaScript program?
<br />var scope = "js scope";
<br />function checkscope()
<br />{
<br />var scope = "javascript scope";
<br />function f()
<br />{
<br />return scope;
<br />}
<br />return f;
<br />}
<br />a) Returns the value in scope
<br />b) Returns value null
<br />c) Shows an error message
<br />d) Returns exception
<br />View Answer
<br />Answer: a
<br />Explanation: The Lexical Environment is an object that is connected with every executing
<br />function, code block, and the script as a whole in JavaScript. The value in scope is
<br />returned by the code snippet above.
<br />29. What will be the output of the following JavaScript code?
<br />int a=0;
<br />for(a;a<5;a++);
<br />console.log(a);
<br />a) 4
<br />b) 5
<br />c) 0
<br />d) error
<br />View Answer
<br />Answer: b
<br />Explanation: The value of a will increase until it equals 5, at which point the cursor will
<br />exit the loop. Because there are no statements in the for loop, the value of a will only
<br />increase. As a result, the result will be five.
<br />30. Which of the following methods/operation does javascript use instead of == and !=?
<br />a) JavaScript uses equalto()
<br />b) JavaScript uses equals() and notequals() instead
<br />c) JavaScript uses bitwise checking
<br />d) JavaScript uses === and !== instead
<br /></div> <hr /><div id="page41-div" >
<br />View Answer
<br />Answer: d
<br />Explanation: The comma operator, bitwise operators, and the ++ and — operators are
<br />not included in the subset. It also forbids the usage of == and!= due to the type
<br />conversion they do, instead requiring the use of === and!==.
<br />31. What will be the result or type of error if p is not defined in the following JavaScript
<br />code snippet?
<br />console.log(p)
<br />a) Value not found Error
<br />b) Reference Error
<br />c) Null
<br />d) Zero
<br />View Answer
<br />Answer: b
<br />Explanation: Console.log() is a javascript predefined function for printing data or
<br />messages to the console. A reference error will occur if the console.log argument is not
<br />defined.
<br />32. What is the prototype represents in the following JavaScript code snippet?
<br />function javascript() {};
<br />a) Not valid
<br />b) Prototype of a function
<br />c) Function javascript
<br />d) A custom constructor
<br />View Answer
<br />Answer: d
<br />Explanation: All object instances have a constructor property that points to the
<br />constructor function that created them. A custom constructor is a constructor which
<br />requires no arguments and is created automatically by the compiler at the time of object
<br />creation if not created by the user.
<br />33. Why event handlers is needed in JS?
<br />a) Allows JavaScript code to alter the behaviour of windows
<br />b) Adds innerHTML page to the code
<br />c) Change the server location
<br />d) Performs handling of exceptions and occurrences
<br />View Answer
<br />Answer: a
<br />Explanation: JS code can change the behavior of windows, documents, and the elements
<br />that make up those documents via event handlers.
<br /></div> <hr /><div id="page42-div" >
<br />34. Which of the following is not a framework?
<br />a) JavaScript .NET
<br />b) JavaScript
<br />c) Cocoa JS
<br />d) jQuery
<br />View Answer
<br />Answer: b
<br />Explanation: jQuery, which is used in web development, is one of the most popular
<br />frameworks. JavaScript is a scripting language, not a framework, in this case.
<br />35. Which of the following is the property that is triggered in response to JS errors?
<br />a) onclick
<br />b) onerror
<br />c) onmessage
<br />d) onexception
<br />View Answer
<br />Answer: b
<br />Explanation: The Window object ’ s onerror property acts as an event handler, and it is
<br />triggered when JavaScript problems occur. However, because it is called with various
<br />arguments, it isn’t a genuine event handler.
<br />36. What will be the output of the following JavaScript code?
<br />function compare()
<br />{
<br />int sanfoundry=1;
<br />char javascript=1;
<br />if(sanfoundry.tostring()===javascript)
<br />return true;
<br />else
<br />return false;
<br />}
<br />a) runtime error
<br />b) logical error
<br />c) true
<br />d) false
<br />View Answer
<br />Answer: c
<br />Explanation: The .tostring() function can be used to convert a non-string (integer) to a
<br />string. Only if the operands are of the same type and the contents match is a rigorous
<br />comparison possible. As a result, the following code line will produce true output.
<br />37. What will be the firstname and surname of the following JavaScript program?
<br /></div> <hr /><div id="page43-div" >
<br />var book = {
<br />"main title": "JavaScript",
<br />'sub-title': "The Definitive Guide",
<br />"for": "all audiences",
<br />author: {
<br />firstname: "David",
<br />surname: "Flanagan"
<br />}
<br />};
<br />a) objects
<br />b) property names
<br />c) properties
<br />d) property values
<br />View Answer
<br />Answer: b
<br />Explanation: An item is contained within another object in the code sample above. The
<br />property names are firstname and surname. The value of that property is an object in and
<br />of itself.
<br />38. Which of the following is not an error in JavaScript?
<br />a) Missing of Bracket
<br />b) Division by zero
<br />c) Syntax error
<br />d) Missing of semicolons
<br />View Answer
<br />Answer: b
<br />Explanation: In JavaScript, division by zero does not result in an error; it just returns
<br />infinity or negative infinity. However, because zero divided by zero has no well-defined
<br />value, the result of this operation is the unusual not-a-number value, which is written as
<br />NaN.
<br />39. Consider the following JavaScript statement containing regular expressions and
<br />check if the pattern matches.
<br />var text = "testing: 1, 2, 3";
<br />var pattern = /d+/g;
<br />a) text.check(pattern)
<br />b) pattern.test(text)
<br />c) text==pattern
<br />d) text.equals(pattern)
<br />View Answer
<br />Answer: b
<br />Explanation: The pattern specified is applied to the text included in parenthesis. The test()
<br /></div> <hr /><div id="page44-div" >
<br />method checks a string for a match. If a match is found, this method returns true;
<br />otherwise, it returns false
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