JavaScript MCQs with answers Page - 142

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. How can you defer script execution until the DOM is loaded?

  • (A) Use defer attribute in script tag
  • (B) Use async attribute
  • (C) Put script at the top
  • (D) Wrap code in alert()

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Q. Which DOM method selects an element by its ID?

  • (A) document.getElementById()
  • (B) document.querySelectorAll()
  • (C) document.getElementByClass()
  • (D) document.findById()

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Q. Which DOM method returns the first element that matches a selector?

  • (A) querySelector()
  • (B) querySelectorAll()
  • (C) getElementById()
  • (D) getElementsByTagName()

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Q. Which object is used to manipulate the HTML document?

  • (A) document
  • (B) window
  • (C) location
  • (D) navigator

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Q. What does the window object represent?

  • (A) The browser window
  • (B) The HTML page
  • (C) The document object
  • (D) The JavaScript engine

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Q. Which method can be used to change the content of an HTML element?

  • (A) innerHTML
  • (B) setAttribute
  • (C) value
  • (D) classList

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Q. Which method adds a new class to an element?

  • (A) classList.add()
  • (B) className.append()
  • (C) setClass()
  • (D) addClass()

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Q. Which method creates a new DOM element?

  • (A) document.createElement()
  • (B) document.newElement()
  • (C) element.create()
  • (D) create()

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Q. Which of the following is a correct way to declare a variable in JavaScript?

  • (A) var myVar;
  • (B) int myVar;
  • (C) let: myVar;
  • (D) declare myVar;

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Q. What will be the output of: console.log(typeof null);

  • (A) null
  • (B) undefined
  • (C) object
  • (D) boolean

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