JavaScript MCQs with answers Page - 50

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. Which of the following statement is not true regarding JavaScript

  • (A) Javascript is a loosely typed language
  • (B) Javascript is an object based language
  • (C) Javascript is event driven
  • (D) Javascript embedded in an HTML document is compiled and executed by the client browser

A

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Q. In Java Script, if you add a leading zero like "0127" the number system followed is

  • (A) Decimal
  • (B) Octal
  • (C) Binary
  • (D) Hexadecimal

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Q. In Java Script, ____ is an object of the target language data type that encloses an object of the source language

  • (A) a wrapper
  • (B) a link
  • (C) a cursor
  • (D) a form

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Q. In JavaScript which of the following is used to declare variable

  • (A) var
  • (B) dim
  • (C) function
  • (D) const

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Q. In Javascript each window object has sub-object, which called

  • (A) Features
  • (B) Properties
  • (C) Characteristics
  • (D) Qualifiers

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Q. Which one is standard way to show popup in Java Script?

  • (A) alert("mcqbuddy")
  • (B) window("mcqbuddy");
  • (C) alert("mcqbuddy");
  • (D) window.alert("mcqbuddy");

A

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Q. What is divide by 0 in Javascript?

Code: 
var a = 10;
var b = 0;
document.write(a/b);
  • (A) 0 is printed
  • (B) Infinity is printed
  • (C) Some Garbage Value
  • (D) Nothing is printed

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Q. What is default value of any variable in Javascript?

Code: 
var a;
document.write(a);
  • (A) 0
  • (B) undefined
  • (C) error
  • (D) NaN

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Q. How ++ works in Javascript? Find output of below Javascript code.

Code: 
var a = 10;
document.write(a++);
document.write(a);
  • (A) 1010
  • (B) 1011
  • (C) 1110
  • (D) 1111

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Q. Find output of below Javascript code

Code: 
var a = 10;
document.write(a=20);
  • (A) 10
  • (B) 20
  • (C) Error
  • (D) Nothing is printed

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