JavaScript MCQs with answers Page - 30

Here, you will find a collection of MCQ questions on JavaScript. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. The object has three object attributes namely

  • (A) Class, parameters, object’s extensible flag
  • (B) Prototype, class, objects’ parameters
  • (C) Prototype, class, object’s extensible flag
  • (D) Native object, Classes and Interfacces and Object’s extensible flag

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Q. A linkage of series of prototype objects is called as

  • (A) prototype stack
  • (B) prototype chain
  • (C) prototype class
  • (D) prototypes

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Q. To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the

  • (A) isPrototypeOf() method
  • (B) equals() method
  • (C) === operator
  • (D) none of the mentioned

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Q. The purpose of extensible attribute is to

  • (A) make all of the own properties of that object nonconfigurable
  • (B) to configure and bring a writable property
  • (C) “lock down” objects into a known state and prevent outside tampering
  • (D) all of the mentioned

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Q. The basic purpose of the toLocaleString() is to

  • (A) return a localised object representation
  • (B) return a parsed string
  • (C) return a local time in the string format
  • (D) return a localized string representation of the object

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Q. JavaScript is designed for following purpose

  • (A) To Style HTML Pages
  • (B) To Execute Query Related to DB on Server
  • (C) To add interactivity to HTML Pages.
  • (D) To Perform Server Side Scripting Opertion

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Q. JavaScript Code can be called by using _________.

  • (A) RMI
  • (B) Triggering Event
  • (C) Preprocessor
  • (D) Function / Method

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Q. Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts)

  • (A) parse
  • (B) async
  • (C) defer
  • (D) type

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Q. Which was the first browser to support JavaScript ?

  • (A) Netscape
  • (B) IE
  • (C) Mozilla Firefox
  • (D) Google Chrome

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Q. The snippet that has to be used to check if “a” is not equal to “null” is

  • (A) if(a!=null)
  • (B) if (!a)
  • (C) if(a!null)
  • (D) if(a!==null)

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