JavaScript MCQs with answers Page - 34

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 keywords is used to define a variable in Javascript?

  • (A) var
  • (B) let
  • (C) Both A and B
  • (D) None of these

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Q. Which of the following methods is used to access HTML elements using Javascript?

  • (A) getElementbyld()
  • (B) getElementsByClassName()
  • (C) Both A and B
  • (D) None of these

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Q. Upon encountering empty statements, what does the Javascript Interpreter do?

  • (A) Throws an error
  • (B) Ignores the statements
  • (C) Gives a warning
  • (D) None of these

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Q. Which of the following methods can be used to display data in some form using Javascript?

  • (A) document.write()
  • (B) console.log()
  • (C) window.alert()
  • (D) All of the above

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Q. In which element we put javascript?

  • (A) <javascript>
  • (B) <scripting>
  • (C) <script>
  • (D) None of These

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Q. the correct place to insert a JavaScript is ?

  • (A) The section
  • (B) The section
  • (C) Both A & B
  • (D) none of these

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Q. Which of the following is the correct syntax for referring to an external script called "xxx.js"?

  • (A) <script src="xxx.js>
  • (B) <script src="xxx.js">
  • (C) <script name="xxx.js">
  • (D) None of these

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Q. What is the code snippet to go back to a history thrice?

  • (A) history(3);
  • (B) history(-3);
  • (C) history.go(-3);
  • (D) history.go(3);

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

Code: 
function myfun()
{
document.getElementById ("demo").innerHTML = Boolean(21 > 15);
}
  • (A) 0
  • (B) true
  • (C) false
  • (D) error

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

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

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