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Advanced JavaScript: Question Bank

This post contains the latest questions on JavaScript in the form of true/false statements, MCQs and fill in the blanks. Try solving the question bank to help in your revision!

Fill in the following blanks:

  1. There are a variety of scripting languages used to develop _____ websites.

Ans. dynamic

  1. A _____ is a set of instructions used to produce various kinds of outputs.

Ans. Program

  1. JavaScript supports _____ programming facility.

Ans. event based

  1. ____ script resides on web server.

Ans. Server side

  1. _____ script resides on client computer and can run on the client page.

Ans. Client side

  1. ______ is a JavaScript based framework for building interactive user interface.

Ans. Vue JS

  1. _____ is a JavaScript based open source front-end web framework developed for single page application.

Ans. Angular JS

  1. ____ consists of JS libraries for building UI for single page application and mobile apps.

Ans. React

  1. In a switch case statement, the value for the case must be of a similar ____ as the variable in switch.

Ans. data type

  1. _____ property of window sets or returns the fact in the status bar of a window.

Ans. Status

  1. for-loop has a combination of _____, _____ and _____ in single statement.

Ans. initialization, condition, iteration

  1. A JavaScript object is an entity having ____ and ____.

Ans. state, behavior

  1. _____ method of window object display the alert box containing message with OK button.

Ans. alert ()

  1. An object can group data together with _____ needed to manipulate it.

Ans. functions

  1. JavaScript supports 2 types of objects; _____ and ____objects.

Ans. built-in, user defined

  1. Math, String, Array, Date are examples of _____objects.

Ans. built in

  1. When an HTML document is loaded into a ____, it becomes a document object.

Ans. web browser

  1. _____ defines logical structure of document.

Ans. Document object

  1. _____ method of window object calls a function or evaluates an expression after a specified number of milliseconds.

Ans, setTimeout ()

  1. The ______of DOM was founded by W3C(World Wide Web Consortium).

Ans. standardization

  1. _____ DOM property is used to set the title of the document.

Ans. Title

  1. DOM method ____ works same as write(), but adds a newline character after each statement.

Ans. writeln()

  1. _____ method of number object converts the given string into an integer number.

Ans. parseFloat ()

  1. _____ method returns cube root of a number.

Ans. cbrt()

  1. DOM’s ____method is the easiest method for accessing form elements.

Ans. getElementById()

  1. The ____ property is useful for getting html element and changing its content.

Ans. innerHTML

  1. _____ object is the peak of the object Hierarchy.

Ans. Window

  1. _____ Window Object property returns the location object for the window.

Ans. Location

  1. Window Object method ____ is used to print the content of current window.

Ans. print()

  1. JavaScript events are actions done by the user or an application that occurs on_____.

Ans. the webpage

  1. ____ Window Object property returns a boolean value to indicate whether a window is closed or not.

Ans. Closed

  1. ______ event occurs when user selects some text of an element.

Ans. onselect

  1. ______ event handler occurs when page/image has been loaded.

Ans. onload

  1. JavaScript built-in objects provide different ____and­­ ____ that are useful while creating live web pages.

Ans. properties, methods

  1. ____ is used to store zero or more characters of text within single or double quotes.

Ans. String

  1. String object is used to ____ and___ text.

Ans. store, manipulate

  1. String object property _____ is used to return the number of characters in a string.

Ans. length

  1. String object Method charAt() is used to return the character at a ____ .

Ans. specified position

  1. ______ String object method is used to remove whitespace from both sides of a string.

Ans. trim()

  1. The built-in math object includes mathematical ____ and ____.

Ans. constants, functions

  1. Math method____ returns the base to the exponent power.

Ans. pow(x, y)

  1. Date method _____ is used to return the day of the week.

Ans. getDay()

  1. Array property index is used to represent the ____ index of the match in the string.

Ans. zero-based

  1. Array property _____ reflects number of elements in array.

Ans. length

  1. _____ array method is used to join two or more arrays.

Ans. concat()

  1. ­­­____ array method is used to copy array elements within the array.

Ans. copyWithin()

  1. Array method find() is used to return the value of the ____ in an array that satisfies a test in testing.

Ans. first element

  1. The index of the first element of an array is ____.

Ans. zero

  1. Date method getMonth() is used to return ____.

Ans. month

  1. Which date method is used to set the hours of a date object?

Ans. setHours()

  1. Date method setMinutes() is used to set the ___of a date object.

Ans. minutes

  1. Date method ____ is used to set the seconds of a date object.

Ans. setSeconds()

  1. Number object MIN_VALUE() property returns the largest ___value.

Ans. minimum

  1. ­­_____ Number property is used to return the largest maximum value.

Ans. MAX_VALUE

  1. Number property ___ is used to represent ‘Not A Number’ value.

Ans. NaN

  1. _____ number method is used to convert the given string into a integer number.

Ans. parseInt()

  1. _____is an object that can store a collection of items.

Ans. Array

  1. _____ array method is used to reverse the order of the elements in an array.

Ans. reverse()

  1. _____ array method is used to sort the elements of an array.

Ans. sort()

State whether the following statements are true or false:

  1. JavaScript is an interpreted scripting language.

Ans. True

  1. JavaScript was initially created to “make webpages alive”.

Ans. True

  1. JavaScript is a light weight scripting language because it supports all features of object oriented programming languages.

Ans. False

  1. Users don’t need any special software to run JavaScript programs

Ans. True

  1. JavaScript is not a case sensitive language.

Ans. False

  1. Most of the JavaScript “Control Statements” are same as control statements in other programming languages.

Ans. True

  1. JavaScript is a platform dependent scripting language

Ans. False

  1. JavaScript is known as a universal client side scripting language.

Ans. True

  1. JavaScript has the ability to create new functions within scripts.

Ans. False

  1. To execute the Server side script, it must be activated by server, and then it is executed on web server.

Ans. False

  1. JavaScript has a built-in multi-way decision statement known as switch.

Ans. True

  1. The default statement for switch case is mandatory.

Ans. False

  1. In switch cases, there should not be duplicity between the cases.

Ans. True

  1. Iteration refers to the execution of a statement or a group of statements of code for a fixed number of times or till the condition is satisfied.

Ans. True

  1. The condition of a looping statement should not be Boolean condition.

Ans. False

  1. Location property of window object returns a Boolean value indicating wheteher the window has been closed or not.

Ans. False

  1. In for loop, the control comes out from the loop when condition becomes false.

Ans. True

  1. Initialization executes only once in the for loop.

Ans. True

  1. The statements in the for loop statement block will execute till the condition is false.

Ans. False

  1. While loop executes statements as long as the condition is true.

Ans. True

  1. The statement within the while loop may only have single line statement.

Ans. False

  1. If condition is always true then the loop would be executed infinitely, so after some execution the condition becomes false.

Ans. True

  1. Almost everything in JavaScript is an object.

Ans. True

  1. Properties and methods of objects are accessed with ‘.’ operator.

Ans. True

  1. JavaScript gives facility to create user defined objects as per user requirements.

Ans. True

  1. trim() adds white spaces from both sides of a string.

Ans. False

  1. ceil() method returns the next integer greater than or equal to a given number.

Ans. True

  1. A break statement is used to make an early exit from a loop.

Ans. True

  1. World Wide Web Consortium works for standardization of web technologies.

Ans. True

  1. DOM property “URL” returns full URL of the HTML document.

Ans. True

  1. DOM property “img” returns Error! Filename not specified.

Ans. True

  1. DOM method write() is used to write HTML expressions or JavaScript code to A document.

Ans. True.

  1. DOM method getElementById() uses id property to find an element.

Ans. True

  1. pow() method returns the base to the exponent power.

Ans. True

  1. The innerHTML property can be changed by any HTML element, includingand.

Ans. True

  1. Window object is the parent object of all other objects.

Ans. True

  1. Window Object property “document” is used to return the document object for the window.

Ans. True

  1. confirm() Method is used to open new window in Window Object

Ans. False

  1. Window Object Method close() is used to close the current window.

Ans. True

  1. Window Object method blur() is used to add focus to the current window.

Ans. False

  1. JavaScript Event Handler “onblur” occurs when the user leaves the field or losses focus of an element.

Ans. True

  1. JavaScript Event Handler “onfocus” occurs when an element losses focus.

Ans. False

  1. “onreset” Event Handler occurs when user clicks the cancel button.

Ans. False

  1. JavaScript built-in objects operate independently.

Ans. True

  1. Users always need to create the Math object before using it.

Ans. False

  1. cbrt(x) Math method returns the cube root of a number.

Ans. True

  1. Math method random(x) gives random number between 0 and 10.

Ans. False

  1. Math method sqrt(x) gives the square root of a number.

Ans. True

  1. The Date object is used to create date and time values.

Ans. True

  1. Date Method getFullYear() is used to return the year in four digits.

Ans. True

  1. Date Method getHours() is used to return the hour from 0-12.

Ans. False

  1. Arrays are useful when we need to store large amounts of data of the same type.

Ans. True

  1. Arrays are used to store single values in single variables.

Ans. False

  1. You set the items in an array by referring to its item number.

Ans. False

  1. Array method forEach() is used to call a function for some array element.

Ans. False

  1. Date getSeconds() Method is used to return the seconds from 0-24.

Ans. False

  1. Date Method getTime() is used to return the number of milliseconds since midnight Jan 1, 1970 00.00.00.

Ans. True

  1. Date Method setFullYear() is used to set the full year if a date object.

Ans. True

  1. Date Method setMonth() is used to set the year of a date object.

Ans. False

  1. Number object helps us to work with numbers.

Ans. True

  1. JavaScript does not provide properties and methods for primitive values.

Ans. False

  1. Number method isInteger() determines whether the given value is an integer.

Ans. True

  1. Array method push() adds new elements to the end of an array.

Ans. True

 

 

Multiple choice questions:

  1. An interpreted language is a type of programming language that executes its instructions ____.
    1. Indirectly
    2. Directly
    3. Partially
    4. None of above

Ans. 2

  1. The programs in this language are called____.
    1. Page
    2. Webpage
    3. Scripts
    4. Block

Ans. 3

  1. JavaScript helps the browser to perform_____ validation.
    1. Output
    2. Input
    3. Both of above
    4. None of above

Ans. 2

  1. JavaScript provides the ability to create new functions within____.
    1. Scripts
    2. Function
    3. Class
    4. None of above

Ans. 1

  1. We can declare a function in JavaScript using ____ keyword.
    1. New
    2. Function
    3. Default
    4. Do

Ans. 2

  1. Client side scripts are placed inside ____document.
    1. Word
    2. HTML
    3. XML
    4. Text

Ans. 2

  1. JavaScript has a built–in multiway decision statement known as___.
    1. If else
    2. Do while
    3. Switch
    4. for

Ans. 3

  1. _____is assigning initial value to the variable.
    1. Condition
    2. Initialization
    3. Iteration
    4. None of above

Ans. 2

  1. In the ‘for loop’, when condition becomes ___control is transferred out of the loop.
    1. True
    2. False
    3. End
    4. Terminate

Ans. 2

  1. If the statement within while loop is a single line then the ____ parenthesis is optional.
    1. Square
    2. Curly
    3. Round
    4. None of above

Ans. 2

  1. Loop will be executed repeatedly till the ____is true.
    1. Condition
    2. Initialization
    3. Iteration
    4. None of above

Ans. 1

  1. ____statement is used to jump out of loop.
    1. End
    2. Out
    3. Break
    4. Remove

Ans. 3

  1. What happens if the break statement is encountered inside the loop?
    1. Control goes to next statement
    2. Control goes to next statement after the loop
    3. Program will stop unexpectedly
    4. Skip the current statement and continue with next statement

Ans. 2

  1. _____ statement is used to skip statement block and take the control at the beginning for next iteration.
    1. Break
    2. Continue
    3. Jump
    4. None of above

Ans. 2

  1. JavaScript is a ____based scripting language.
    1. Object
    2. Data
    3. Variable
    4. Datatype

Ans. 1

  1. The ‘new’ keyword is used to create new _____ in JavaScript.
    1. Object
    2. Function
    3. Variable
    4. None of above

Ans. 1

  1. DOM property “body” returns___ elements.
    1. URL
    2.  
    3. Title
    4.  

Ans. 4

  1. Window object represents ____window in a browser.
    1. Name of
    2. Closed
    3. Open
    4. Status

Ans. 3

  1. An object of window is created automatically by the___.
    1. User
    2. Server
    3. Browser
    4. None of above

Ans. 3

  1. Which Window Object property is used to set the name of a window?
    1. Document
    2. Name
    3. Status
    4. Location

Ans. 2

  1. Status Window Object property is used to set the text in the ____of a window.
    1. Tool bar
    2. Status bar
    3. Title bar
    4. Menu bar

Ans. 2

  1. The Window Object Method____ displays the alert box containing message with OK button.
    1. prompt()
    2. ALERT()
    3. confirm()
    4. blur()

Ans. 2

  1. Which Window Object Method displays the confirm dialog box?
    1. ALERT()
    2. confirm()
    3. blur()
    4. focus()

Ans. 2

  1. Which Window Object method is used to set focus to the current window?
    1. prompt()
    2. confirm()
    3. blur()
    4. focus()

Ans. 4

  1. “onsubmit” event handler is used when user clicks ____button.
    1. Cancel
    2. Submit
    3. Ok
    4. None of above

Ans. 2

  1. abs(X) math method is used to return _____ of number.
    1. Cube
    2. Square
    3. Absolute
    4. None of above.

Ans. 3

  1. Date object can be created using ____ keyword.
    1. Now
    2. New
    3. Create
    4. None of above

Ans. 2

  1. Date method getDate() is used to return the day of the ____.
    1. Year
    2. Month
    3. Week
    4. Both of above

Ans. 2

  1. Which date method returns the minutes?
    1. getSeconds()
    2. getTime()
    3. setMinutes()
    4. getMinutes()

Ans. 4

  1. Date setDate() Method is used to set the day of the ___ of a date object.
    1. Month
    2. Year
    3. Weak
    4. None of above

Ans. 1

  1. JavaScript arrays are used to store multiple values in ___variable.
    1. Double
    2. Single
    3. Both of above
    4. None of above

Ans. 2

  1. ____ is a special variable which can hold more than one value at a time.
    1. Array
    2. List
    3. Number
    4. String

Ans. 1

  1. The index of the first element of an array is____.
    1. One (1)
    2. Zero(0)
    3. Minus one (-1)
    4. Any number.

Ans. 2

  1. _______ scripts are used for validation purposes.
    1. Website
    2. Server side
    3. Client side
    4. Web browser

    Ans. 3

  2. All tangible things are known as ____.
    1. Methods
    2. Objects
    3. Functions
    4. Variables

    Ans. 2

     
  3. _____ array method is used to remove the last element of an array, and return that element.
    1. Push()
    2. Pop()
    3. Sort()
    4. Reverse()

Ans. 2

 
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