Software Development Exam  >  Software Development Tests  >  JavaScript for Web Development  >  Quiz: Introduction to JS - 1 - Software Development MCQ

Quiz: Introduction to JS - 1 - Software Development MCQ


Test Description

15 Questions MCQ Test JavaScript for Web Development - Quiz: Introduction to JS - 1

Quiz: Introduction to JS - 1 for Software Development 2024 is part of JavaScript for Web Development preparation. The Quiz: Introduction to JS - 1 questions and answers have been prepared according to the Software Development exam syllabus.The Quiz: Introduction to JS - 1 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Quiz: Introduction to JS - 1 below.
Solutions of Quiz: Introduction to JS - 1 questions in English are available as part of our JavaScript for Web Development for Software Development & Quiz: Introduction to JS - 1 solutions in Hindi for JavaScript for Web Development course. Download more important topics, notes, lectures and mock test series for Software Development Exam by signing up for free. Attempt Quiz: Introduction to JS - 1 | 15 questions in 30 minutes | Mock test for Software Development preparation | Free important questions MCQ to study JavaScript for Web Development for Software Development Exam | Download free PDF with solutions
Quiz: Introduction to JS - 1 - Question 1

Which of the following is true about JavaScript?

Detailed Solution for Quiz: Introduction to JS - 1 - Question 1

JavaScript is an object-oriented programming language commonly used for client-side scripting in web development.

Quiz: Introduction to JS - 1 - Question 2

What is the purpose of JavaScript comments?

Detailed Solution for Quiz: Introduction to JS - 1 - Question 2

JavaScript comments are used to add explanatory notes to the code, making it easier to understand and maintain.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Quiz: Introduction to JS - 1 - Question 3

Which of the following is a valid JavaScript data type?

Detailed Solution for Quiz: Introduction to JS - 1 - Question 3

JavaScript supports multiple data types, including Date, Array, and String, among others.

Quiz: Introduction to JS - 1 - Question 4

How do you output a message to the console in JavaScript?

Detailed Solution for Quiz: Introduction to JS - 1 - Question 4

The console.log() function is used to output messages to the browser console in JavaScript.

Quiz: Introduction to JS - 1 - Question 5

What is the output of the following JavaScript code?
var x = 10;
var y = "5";
console.log(x + y);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 5

JavaScript performs type coercion and converts the number 10 to a string before concatenating it with the string "5".

Quiz: Introduction to JS - 1 - Question 6

What is the output of the following JavaScript code?
var x = 5;
console.log(x++);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 6

The post-increment operator (x++) returns the current value of x (5) and then increments it to 6.

Quiz: Introduction to JS - 1 - Question 7

What is the output of the following JavaScript code?
var x = 10;
var y = 5;
console.log(x += y);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 7

The += operator is used for addition and assignment. It adds the value of y to x and assigns the result back to x, resulting in x being 15.

Quiz: Introduction to JS - 1 - Question 8

What is the output of the following JavaScript code?
var x = "Hello";
console.log(x.length);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 8

The length property is used to determine the number of characters in a string. In this case, the string "Hello" has a length of 5.

Quiz: Introduction to JS - 1 - Question 9

What is the output of the following JavaScript code?
var x = [1, 2, 3];
x.push(4);
console.log(x.length);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 9

The push() method is used to add elements to the end of an array. In this case, it adds the number 4 to the array, resulting in a length of 4.

Quiz: Introduction to JS - 1 - Question 10

What is the output of the following JavaScript code?
var x = 10;
if (x === "10") {
  console.log("Equal");
} else {
  console.log("Not equal");
}

Detailed Solution for Quiz: Introduction to JS - 1 - Question 10

The strict equality operator (===) compares both the value and the type. Since x is a number and "10" is a string, they are not equal.

Quiz: Introduction to JS - 1 - Question 11

What is the output of the following JavaScript code?
 

function multiply(a, b) {
  return a * b;
}

var result = multiply(2, 3);
console.log(result);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 11

The multiply() function takes two arguments and returns their product. The function is called with arguments 2 and 3, resulting in a return value of 6.

Quiz: Introduction to JS - 1 - Question 12

What is the output of the following JavaScript code?
 

var x = 5;

function increment() {
  var x = 10;
  x++;
}

increment();
console.log(x);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 12

The variable x inside the increment() function is a separate variable from the global x. Modifying the local x doesn't affect the global x.

Quiz: Introduction to JS - 1 - Question 13

What is the output of the following JavaScript code?
 

var x = 5;

function update() {
  x = 10;
}

update();
console.log(x);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 13

The update() function modifies the global variable x by assigning it a new value of 10. The console.log() statement outputs the updated value.

Quiz: Introduction to JS - 1 - Question 14

What is the output of the following JavaScript code?
 

var x = 5;

function multiplyByTwo(x) {
  return x * 2;
}

var result = multiplyByTwo(x);
console.log(result);

Detailed Solution for Quiz: Introduction to JS - 1 - Question 14

The multiplyByTwo() function has a local variable x, which shadows the global x. The local x is multiplied by 2, resulting in a return value of 10.

Quiz: Introduction to JS - 1 - Question 15

What is the output of the following JavaScript code?
 

function greet(name) {
  console.log("Hello, " + name + "!");
}

greet("John", "Doe");

Detailed Solution for Quiz: Introduction to JS - 1 - Question 15

The greet() function takes one argument and outputs a greeting message with the provided name. The extra argument "Doe" is ignored in this case.

51 videos|28 docs|12 tests
Information about Quiz: Introduction to JS - 1 Page
In this test you can find the Exam questions for Quiz: Introduction to JS - 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Quiz: Introduction to JS - 1, EduRev gives you an ample number of Online tests for practice

Top Courses for Software Development

51 videos|28 docs|12 tests
Download as PDF

Top Courses for Software Development