JavaScript MCQs with answers Page - 24

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 JavaScript method is used to call a function (a callback function) once for each array element?

  • (A) for()
  • (B) traverse()
  • (C) forEach()
  • (D) foreach()

A

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

Code:
<script>
	const arr = [10, 20, 30];
	let result = 0;
	
	arr.forEach(myFunction);
	
	document.write("Result: " , result)
	function myFunction(value, index, array) {
	  result += value; 
	}
</script>
  • (A) Result: 60
  • (B) Result: 102030
  • (C) Result: 10,20,30
  • (D) ValueError

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

Code:
<script>
	const values = [10, 20, 30];
	const result = values.map(myFunction);

	document.write("Result: ", result);

	function myFunction(value, index, array) {
	  return value * value;
	}
</script>
  • (A) Result: 10,20,30
  • (B) Result: 10*10,20*20,30*30
  • (C) Result: 100,400,900
  • (D) ValueError

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Q. Which JavaScript method is used to create a new array with array elements that passes a test?

  • (A) forEach()
  • (B) map()
  • (C) forMap()
  • (D) filter()

A

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Q. Which JavaScript object works with the dates?

  • (A) Date
  • (B) DateTime
  • (C) date
  • (D) dateTime

A

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Q. Which JavaScript statement(s) is correct to create Date object(s) with new Date() constructor?

  • (A) new Date()
  • (B) new Date(year, month, day, hours, minutes, seconds, milliseconds)
  • (C) new Date(milliseconds)
  • (D) All of the above

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

Code:
<script>
	const curr = new Date();
	document.write(curr);
</script>
  • (A) Tue Dec 21 2021 13:04:36 GMT+0530
  • (B) Tue Dec 21 2021 13:04:36 (India Standard Time)
  • (C) Tue Dec 21 2021 13:04:36::00::01 GMT+0530 (India Standard Time)
  • (D) Tue Dec 21 2021 13:04:36 GMT+0530 (India Standard Time)

A

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Q. Which JavaScript method is used to convert a date to a UTC string (a date display standard)?

  • (A) toUTCString()
  • (B) toUtcString()
  • (C) utcString()
  • (D) toutcstring()

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Q. The internal clock in JavaScript counts from midnight _____.

  • (A) January 1, 1972
  • (B) January 1, 1947
  • (C) January 1, 1980
  • (D) January 1, 1970

A

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Q. Which method is used to get the year of a date as a four-digit number?

  • (A) getYear()
  • (B) fullYear()
  • (C) getFullYear()
  • (D) getfullyear()