Quiz: Introduction to JS - 2 - Free MCQ Test with solutions for Software
MCQ Practice Test & Solutions: Quiz: Introduction to JS - 2 (15 Questions)
You can prepare effectively for Software Development JavaScript for Web Development with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Quiz: Introduction to JS - 2". These 15 questions have been designed by the experts with the latest curriculum of Software Development 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 30 minutes
- - Number of Questions: 15
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Detailed Solution: Question 1
Which of the following is NOT a valid data type in JavaScript?
Detailed Solution: Question 2
Detailed Solution: Question 3
How do you comment a single line of code in JavaScript?
Detailed Solution: Question 4
Which of the following is an example of a JavaScript framework?
Detailed Solution: Question 5
What will be the output of the following code snippet?
console.log(2 + "2");
console.log(2 + "2");
Detailed Solution: Question 6
What will be the output of the following code snippet?
console.log("2" - 1);
console.log("2" - 1);
Detailed Solution: Question 7
What will be the output of the following code snippet?
var x = 10;
function foo() {
console.log(x);
var x = 20;
}
foo();
var x = 10;
function foo() {
console.log(x);
var x = 20;
}
foo();
Detailed Solution: Question 8
What will be the output of the following code snippet?
for (let i = 0; i < 3; i++) {
setTimeout(function() {
console.log(i);
}, 1000);
}
for (let i = 0; i < 3; i++) {
setTimeout(function() {
console.log(i);
}, 1000);
}
Detailed Solution: Question 9
What will be the output of the following code snippet?
console.log(typeof NaN === "number");
console.log(typeof NaN === "number");
Detailed Solution: Question 10
What will be the output of the following code snippet?
let x = 5;
(function() {
console.log(x);
let x = 10;
})();
let x = 5;
(function() {
console.log(x);
let x = 10;
})();
Detailed Solution: Question 11
What will be the output of the following code snippet?
let x = 1;
function foo() {
console.log(x);
let x = 2;
}
foo();
let x = 1;
function foo() {
console.log(x);
let x = 2;
}
foo();
Detailed Solution: Question 12
What will be the output of the following code snippet?
var x = 10;
function foo() {
console.log(x);
if (false) {
var x = 20;
}
}
foo();
var x = 10;
function foo() {
console.log(x);
if (false) {
var x = 20;
}
}
foo();
Detailed Solution: Question 13
What will be the output of the following code snippet?
let x = 10;
{
console.log(x);
let x = 20;
}
let x = 10;
{
console.log(x);
let x = 20;
}
Detailed Solution: Question 14
What will be the output of the following code snippet?
let x = 1;
{
let x = 2;
{
console.log(x);
let x = 3;
}
}
let x = 1;
{
let x = 2;
{
console.log(x);
let x = 3;
}
}
Detailed Solution: Question 15
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