JavaScript MCQs with answers Page - 35

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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A

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Q. What will be the output of the following JavaScript code?

Code:
function myfun()
{
var a = null;
document.getElementById ("demo").innerHTML = Boolean(a);
} }
  • (A) true
  • (B) false
  • (C) error
  • (D) undefined

A

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Q. The inner frame within a top-level window can be referred to as _____________

  • (A) parent/parent
  • (B) parent*parent
  • (C) parent.parent
  • (D) parent(parent)

A

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Q. How are windows, tabs, iframes, and frames treated according to client-side javascript?

  • (A) They are all Window objects
  • (B) They are all Window contexts
  • (C) They are all browsing information
  • (D) They are all browsing contexts

A

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Q. Each tab in the single web browser window is called as ____________

  • (A) Browser Information
  • (B) Browsing context
  • (C) Both Browser Information & Browsing context
  • (D) Browser Log

A

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Q. When will the browser invoke the handler?

  • (A) Program begins
  • (B) Any event occurs
  • (C) Specified event occurs
  • (D) None of the above

A

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Q. An _______ is a special variable, which can hold more than one value

  • (A) string
  • (B) integer
  • (C) character
  • (D) array

A

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Q. It is a common practice to declare arrays with the _________ keyword.

  • (A) var
  • (B) let
  • (C) const
  • (D) none of the above

A

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Q. Spaces and line breaks are not important.

  • (A) True
  • (B) False
  • (C) Can be true or false
  • (D) Can not say

A

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Q. Array indexes start with ______.

  • (A) -1
  • (B) 0
  • (C) 1
  • (D) Can not say

A

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Q. The ________ operator in JavaScript returns "object" for arrays.

  • (A) typeof
  • (B) not
  • (C) or
  • (D) and

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