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JavaScript Set-2

Leave a Comment / O Level Tests / By brcinstitute111@gmail.com

Instruction:-

Number of Questions : 25

Total Marks : 25

Each question carry 1 Marks.

No negative marking

Results

#1. What is the output of this code?
javascript
CopyEdit
console.log(3 + 4 + “5”);

"75"

"345"

12

7 + 5

#2. What is the output of:
javascript
CopyEdit
console.log(typeof null);

null

object

undefined

NaN

#3. Which JavaScript method adds an element to the end of an array?

add()

append()

push()

insert()

#4. Which method can remove the last element of an array?

pop()

shift()

splice()

remove()

#5. What does NaN stand for in JavaScript?

Not a Number

Null and None

Negative and Null

Name as Number

#6. What will be the result of this code?
javascript
CopyEdit
console.log(5 == “5”);

true

false

undefined

error

#7. What will be the output of this code?
javascript
CopyEdit
console.log(“10” + 1);

11

101

10.1

error

#8. Which of these values is considered falsy in JavaScript?

"0"

true

undefined

[]

#9. What will this code return?
javascript
CopyEdit let fruits = [“apple”, “banana”];
console.log(fruits[1]);

"apple"

"banana"

undefined

1

#10. What is the output?
javascript
CopyEdit let a = 2;
let b = 3;
a += b;
console.log(a);

5

6

23

undefined

#11. How can you round the number 4.7 to the nearest integer?

Math.up(4.7)

round(4.7)

Math.round(4.7)

integer(4.7)

#12. What does the break statement do in a loop?

Ends the loop immediately

Skips one iteration

Jumps to the next loop

Breaks the code into parts

#13. What will this code output?
javascript
CopyEdit
let nums = [1, 2, 3];
nums.push(4);
console.log(nums.length);

3

4

5

undefined

#14. What is the correct way to define an array in JavaScript?

let arr = "1,2,3";

let arr = (1,2,3);

let arr = [1, 2, 3];

let arr = {1,2,3};

#15. Which of the following keywords declares a block-scoped variable?

var

let

const

Both B and C

#16. Which HTML tag is used to include JavaScript code?

javascript

js

script

scripting

#17. How do you write a single-line comment in JavaScript?

``

/* This is a comment */

// This is a comment

# This is a comment

#18. Which keyword is used to declare a variable that can be reassigned?

const

let

static

def

#19. What will be the output of the following JavaScript code?
javascript console.log(10 + “5”);

15

"15"

"105"

Error

#20. Which operator checks for both value and data type equality?

==

!=

===

!==

#21. Which method is used to get an HTML element by its unique ID?

document.getElementByName(

document.getElementsByTagName()

document.getElementById()

document.querySelector()

#22. What is the correct way to define a JavaScript function?

function = myFunction()

myFunction() = function {}

function myFunction()

define function myFunction()

#23. In an array myArray = [10, 20, 30, 40];, what is the value of myArray[2]?

10

20

30

40

#24. Which event occurs when a user clicks on an HTML element?

onmouseover

onchange

onclick

onsubmit

#25. What is the primary purpose of JavaScript in a web page?

To define the structure and content of the page.

To style the appearance of the page.

To add interactivity and dynamic behavior to the page.

To manage server-side databases.

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Results

#1. What is the output of this code? javascript CopyEdit console.log(3 + 4 + “5”);

#2. What is the output of:javascript CopyEdit console.log(typeof null);

#3. Which JavaScript method adds an element to the end of an array?

#4. Which method can remove the last element of an array?

#5. What does NaN stand for in JavaScript?

#6. What will be the result of this code? javascript CopyEdit console.log(5 == “5”);

#7. What will be the output of this code? javascript CopyEdit console.log(“10” + 1);

#8. Which of these values is considered falsy in JavaScript?

#9. What will this code return?javascript CopyEdit let fruits = [“apple”, “banana”]; console.log(fruits[1]);

#10. What is the output?javascript CopyEdit let a = 2; let b = 3; a += b; console.log(a);

#11. How can you round the number 4.7 to the nearest integer?

#12. What does the break statement do in a loop?

#13. What will this code output? javascript CopyEdit let nums = [1, 2, 3]; nums.push(4); console.log(nums.length);

#14. What is the correct way to define an array in JavaScript?

#15. Which of the following keywords declares a block-scoped variable?

#16. Which HTML tag is used to include JavaScript code?

#17. How do you write a single-line comment in JavaScript?

#18. Which keyword is used to declare a variable that can be reassigned?

#19. What will be the output of the following JavaScript code? javascript console.log(10 + “5”);

#20. Which operator checks for both value and data type equality?

#21. Which method is used to get an HTML element by its unique ID?

#22. What is the correct way to define a JavaScript function?

#23. In an array myArray = [10, 20, 30, 40];, what is the value of myArray[2]?

#24. Which event occurs when a user clicks on an HTML element?

#25. What is the primary purpose of JavaScript in a web page?

Leave a Comment Cancel Reply

#1. What is the output of this code?
javascript
CopyEdit
console.log(3 + 4 + “5”);

#2. What is the output of:
javascript
CopyEdit
console.log(typeof null);

#6. What will be the result of this code?
javascript
CopyEdit
console.log(5 == “5”);

#7. What will be the output of this code?
javascript
CopyEdit
console.log(“10” + 1);

#9. What will this code return?
javascript
CopyEdit let fruits = [“apple”, “banana”];
console.log(fruits[1]);

#10. What is the output?
javascript
CopyEdit let a = 2;
let b = 3;
a += b;
console.log(a);

#13. What will this code output?
javascript
CopyEdit
let nums = [1, 2, 3];
nums.push(4);
console.log(nums.length);

#19. What will be the output of the following JavaScript code?
javascript console.log(10 + “5”);