JavaScript MCQs with answers Page - 137

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 built-in object is used for mathematical operations?

  • (A) Math
  • (B) Number
  • (C) Calc
  • (D) Count

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Q. What does the 'typeof' operator return for a function?

  • (A) function
  • (B) object
  • (C) method
  • (D) callable

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Q. Which of the following can be used to stop a setInterval?

  • (A) clearInterval()
  • (B) stopInterval()
  • (C) pauseInterval()
  • (D) cancelInterval()

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Q. Which symbol is used for nullish coalescing in JavaScript?

  • (A) ??
  • (B) ||
  • (C) &&
  • (D) ::

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Q. Which method returns the first element that satisfies a testing function?

  • (A) find()
  • (B) filter()
  • (C) map()
  • (D) some()

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Q. Which method tests whether at least one element passes a test?

  • (A) some()
  • (B) every()
  • (C) includes()
  • (D) find()

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Q. What is the purpose of the 'use strict' directive?

  • (A) Enables strict mode which catches common coding bugs
  • (B) Enables TypeScript syntax
  • (C) Disables error reporting
  • (D) Forces all variables to be global

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Q. Which method is used to round a number down to the nearest integer?

  • (A) Math.floor()
  • (B) Math.ceil()
  • (C) Math.round()
  • (D) Math.cut()

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Q. Which operator checks both value and type?

  • (A) ===
  • (B) ==
  • (C) =
  • (D) !=

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Q. How do you create an object in JavaScript?

  • (A) let obj = {};
  • (B) let obj = [];
  • (C) let obj = ();
  • (D) let obj = <>;

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