Classes And Modules MCQ

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

• What will be the reaction when a catch clause has no conditionals ?
  ক

  Takes it to be 0

  খ

  Takes it to be 1

  গ

  Takes it to be true

  ঘ

  Takes it to be false
• What is the code to be used to trim whitespaces ?
  ক

  let trimmed = (l.trim() for (l in lines));

  খ

  let trimmed = (trim(l));

  গ

  let trimmed = l.trim();

  ঘ

  let trimmed = for(l in lines));
• Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections ?
  ক

  ExitIteration

  খ

  AbortIteration

  গ

  Abort

  ঘ

  StopIteration
• The main difference between the variables declared with var and with let is
  ক

  var is confined to a particular function but let is not

  খ

  let is confined to a particular function but var is not

  গ

  var defines values based on conditions but let does not

  ঘ

  none of the mentioned
• Why is the this keyword forbidden in JavaScript?
  ক

  Highly memory consuming

  খ

  Functions should access the global objects

  গ

  Functions should not access the global objects

  ঘ

  Very inefficient to use
• Why does JavaScript subset disallow == and !=?
  ক

  It uses bitwise checking

  খ

  It uses === and !== instead

  গ

  It uses equals() and notequals() instead

  ঘ

  None of the mentioned
• The Crockford’s subset doesnot include which function in JavaScript?
  ক

  eval()

  খ

  coeval()

  গ

  equal()

  ঘ

  equivalent()
• What would be the result of the following statement in JavaScript using regular expression methods ?
  ক

  Returns

  খ

  Returns

  গ

  Returns

  ঘ

  Throws an exception
• The method that performs the search-and-replace operation to strings for pattern matching is
  ক

  searchandreplace()

  খ

  add()

  গ

  edit()

  ঘ

  replace()
• What is the most essential purpose of parantheses in regular expressions ?
  ক

  Define pattern matching techniques

  খ

  Define subpatterns within the complete pattern

  গ

  Define portion of strings in the regular expression

  ঘ

  All of the mentioned
• What does the subexpression /java(script)?/ result in ?
  ক

  It matches “java” followed by the optional “script”

  খ

  It matches “java” followed by any number of “script”

  গ

  It matches “java” followed by a minimum of one “script”

  ঘ

  None of the mentioned
• What will be the result when non greedy repetition is used on the pattern /a+?b/ ?
  ক

  Matches the letter b preceded by the fewest number of a’s possible

  খ

  Matches the letter b preceded by any number of a

  গ

  Matches letter a preceded by letter b, in the stack order

  ঘ

  None of the mentioned
• The regular expression to match any one character not between the brackets is
• The ‘$’ present in the RegExp object is called a
  ক

  character

  খ

  matcher

  গ

  metacharacter

  ঘ

  metadata
• What can be done in order to avoid creation of global variables in JavaScript?
  ক

  To use a method that defines all the variables

  খ

  To use an object that has the reference to all the variables

  গ

  To use an object as its namespace

  ঘ

  To use global functions
• The properties() method is a
  ক

  Enumerable method

  খ

  Non-enumerable method

  গ

  Operational method

  ঘ

  None of the mentioned
• The provides() function and the exportsobject are used to
  ক

  Register the module’s API and Store their API

  খ

  Store the module’s API and register their API

  গ

  Store the module’s API

  ঘ

  None of the mentioned
• Modules that have more than one item in their API can
  ক

  Assign itself to a global variable

  খ

  Invoke another module of the same kind

  গ

  Return a namespace object

  ঘ

  Invoke another module of the same kind
• The scope of a function is also called as
  ক

  The function’s scope

  খ

  Module function

  গ

  Modulated function

  ঘ

  Private function
• The maximum number of global symbols a module can define is
  ক

  2

  খ

  3

  গ

  1

  ঘ

  4
• The functions provide() and require() of Dojo toolkit and Google’s Closure library are used for
  ক

  declaring and loading modules

  খ

  loading and declaring modules

  গ

  declaring modules

  ঘ

  none of the mentioned
• You can refresh the webpage in JavaScript by using
  ক

  window.reload

  খ

  location.reload

  গ

  window.refresh

  ঘ

  page.refresh
• The class that represents the regular expressions is
  ক

  RegExpObj

  খ

  RegExpClass

  গ

  RegExp

  ঘ

  StringExp
• Which are usually variables that are used internally in object methods and also are globally visible variables?
  ক

  Object properties

  খ

  Variable properties

  গ

  Method properties

  ঘ

  Internal properties
• The object whose properties are inherited by all instances of the class, and properties whose values are functions behaving like instance methods of the class, is
  ক

  Instance object

  খ

  Constructor object

  গ

  Destructor object

  ঘ

  Prototype object
• The properties of the objects act like different kinds of class members. They are
  ক

  Public object, Private object, Protected object

  খ

  Constructor object, Function object, Destructor object

  গ

  Constructor object, Prototype object, Instance object

  ঘ

  Instance method, Static object, Dynamic object
• The four kinds of class members are
  ক

  Instance methods, Instance fields, Static method, Dynamic method

  খ

  Instance fields, Instance methods, Class fields, Class methods

  গ

  Instance fields, Non-instance fields, Dynamic methods, Global methods

  ঘ

  Global methods, Local methods, Dynamic methods, Static methods
• The method that can be used to create new properties and also to modify the attributes of existing properties is
  ক

  Object.defineProperty()

  খ

  Object.defineProperties()

  গ

  Both Object.defineProperty() and Object.defineProperties()

  ঘ

  None of the mentioned
• The snippet that filters the filtered set is
  ক

  var t=new FilteredSet(s, {function(s) {return !(x instanceof Set);});

  খ

  var t=new FilteredSet{function(s) {return !(x instanceof Set);});

  গ

  var t=new FilteredSet(s, {function(s) {return (x instanceof Set);});

  ঘ

  var t=new FilteredSet(s, {function(s) {return x;});
• If A is the superclass and B is the subclass, then subclass inherting the superclass can be represented as
  ক

  B=inherit(A);

  খ

  B=A.inherit();

  গ

  B.prototype=inherit(A);

  ঘ

  B.prototype=inherit(A.prototype);