JavaScript MCQ

Test your knowledge with important JavaScript MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more JavaScript MCQs at Bissoy

• If we have an object r and want to know if it is a Range object, we can write:
  ক

  r typeof Range

  খ

  r is Range

  গ

  r equals Range

  ঘ

  r instanceof Range
• A key path is defined as
  ক

  A url that directs to the value

  খ

  A value that is similar to hash table

  গ

  A value that tells the database how to extract an object’s key from the object

  ঘ

  None of the mentioned
• In the IndexedDB database, database is defined as
  ক

  A collection of objects

  খ

  A collection of named object stores

  গ

  Objects collection

  ঘ

  None of the mentioned
• The Client-Side Databases are stored in the
  ক

  The JavaScript code

  খ

  User’s computer

  গ

  Both JavaScript code and User’s computer

  ঘ

  None of the mentioned
• The localStorage and sessionStorage belongs to
  ক

  Window object

  খ

  Element object

  গ

  Hash object

  ঘ

  DOM object
• Which is the most appropriate database for developers requiring huge amount of data?
  ক

  Database

  খ

  Datawarehouse

  গ

  Web databases

  ঘ

  Access
• Which is the Microsoft’s own proprietary client-side storage?
  ক

  IE User Data

  খ

  Offline Web Applications

  গ

  Cookies

  ঘ

  All of the mentioned
• Which are the forms of client-side storage?
  ক

  Web Databases

  খ

  FileSystem API

  গ

  Offline Web Applications

  ঘ

  All of the mentioned
• Which of the following are the features of jQuery?
  ক

  Efficient query method for finding the set of document elements

  খ

  Expressive syntax for referring to elements in the document

  গ

  Useful set of methods for manipulating selected elements

  ঘ

  All of the mentioned
• XMLHttpRequesr is a
  ক

  Object

  খ

  Class

  গ

  Both Object and Class

  ঘ

  None of the mentioned
• The other name for Comet is
  ক

  Server Push

  খ

  Ajax Push

  গ

  HTTP Streaming

  ঘ

  All of the mentioned
• Which of the below is a lieral reverse of Ajax?
  ক

  HTTP

  খ

  HTML

  গ

  XML

  ঘ

  Comet
• Cookies were originally designed for
  ক

  Client-side programming

  খ

  Server-side programming

  গ

  Both Client-side & Server-side programming

  ঘ

  None of the mentioned
• Which of the following is not a navigator property?
  ক

  platform

  খ

  plugin

  গ

  userAgent

  ঘ

  all of the mentioned
• Which side of image map can be created using JavaScript?
  ক

  Server side

  খ

  Client side

  গ

  Both Server and Client side

  ঘ

  None of the mentioned
• What is a framework?
  ক

  User time efficiency

  খ

  Author time efficiency

  গ

  Both User time and Author time efficiency

  ঘ

  None of the mentioned
• Which of the following are the properties of a plug-in entry?
  ক

  name

  খ

  filename

  গ

  mimeTypes

  ঘ

  all of the mentioned
• What is the purpose of the Legacy DOM ?
  ক

  Makes the scripting easier

  খ

  Allows access to few keys and elements

  গ

  All of the mentioned

  ঘ

  None of the mentioned
• Which of the following global variables is used to get parameters?
  ক

  $HTTP_GET_VAR

  খ

  $HTTP_GET_VARS()

  গ

  $HTTP_GET_VARS

  ঘ

  $HTTP_GET_VARS
• The blobs are generally stored in
  ক

  Memory

  খ

  Disk

  গ

  Both Memory and Disk

  ঘ

  None of the mentioned
• The size of blobs are generally calculated in
  ক

  Meters

  খ

  Kilometers

  গ

  Bytes

  ঘ

  Pixels
• BLOB stands for
  ক

  Binary Little Object

  খ

  Binary Large Object

  গ

  Broken Large Object

  ঘ

  None of the mentioned
• The object that looks to the thread that creates it is
  ক

  Window

  খ

  Worker

  গ

  Element

  ঘ

  Hash
• What is the inital step to set up a CSS Lazy Loading?
  ক

  Fetching data

  খ

  Loading the script

  গ

  Loading the page

  ঘ

  Adding the event listener
• What is the method to create a data frame ?
  ক

  frame(data)

  খ

  frameData()

  গ

  data.frame()

  ঘ

  none of the mentioned
• What should be the type of the script_url?
  ক

  Object

  খ

  String

  গ

  Array

  ঘ

  Any of the mentioned
• Which of the below does not belong to the Render Engine work flow?
  ক

  Paint DOM elements

  খ

  Parse Content

  গ

  uild DOM nodes in render tree

  ঘ

  None of the mentioned
• Which keyword must be used to get a more granular insight of the memory usage?
  ক

  verb

  খ

  verbose

  গ

  granule

  ঘ

  none of the mentioned
• Which of the following property indicate the total size of heap?
  ক

  heapSize

  খ

  totalHeapSize

  গ

  totalJsHeapSize

  ঘ

  totalHeap
• Which is the method used to process on the input’s post data before it is saved to the database?
  ক

  prep()

  খ

  settings()

  গ

  defineSettings()

  ঘ

  prepSettings()