JavaScript MCQs with answers Page - 20

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 property is used to define the HTML content to an HTML element with a specific id?

  • (A) innerText
  • (B) innerContent
  • (C) elementText
  • (D) innerHTML

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Q. Which JavaScript method is used to write HTML output?

  • (A) document.write()
  • (B) document.output()
  • (C) console.log()
  • (D) document.writeHTML()

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Q. Which JavaScript method is used to write into an alert box?

  • (A) window.alertHTML()
  • (B) window.alert()
  • (C) window.alertBox()
  • (D) window.alertContent()

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Q. Which is the correct JavaScript statement to print the addition of two numbers 10 and 2o in a paragraph whose id is "result"?

  • (A) getElementById("result").innerHTML = 10+20;
  • (B) getElementById("result").innerHTML = "10+20";
  • (C) getElementById("#result").innerHTML = 10+20;
  • (D) All of the above

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Q. What is the use of this JavaScript statement?

Code: 
<button onclick="window.print()">Submit</button>
  • (A) It will write "Submit" on the current Window
  • (B) It will print the content of the current page
  • (C) It will write the content of the current page in the browser’s console
  • (D) None of the above

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Q. In JavaScript, single line comment begins with ___.

  • (A) #
  • (B) /*
  • (C) $
  • (D) //

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Q. In JavaScript, multi-line comments start with __ and end with ___.

  • (A) /* and */
  • (B) <!—and -->
  • (C) ## and ##
  • (D) // and //

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Q. Which JavaScript keyword is used to declare a variable?

  • (A) Var
  • (B) var
  • (C) Let
  • (D) All of the above

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Q. How many keywords are there in JavaScript to declare variables or constants?

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4

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Q. What is the main difference between var and let keywords in JavaScript?

  • (A) var defines a variable while let defines a constant
  • (B) var defined function scoped variable while let define block scoped variable
  • (C) The value of a variable declared with var can be changed while the value of a variable declared with let cannot be changed
  • (D) All of the above

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