JavaScript MCQ Questions with answers and solutions Page 29

Q. What is the purpose of image replacement?

(A) To replace an image
(B) To implement special effects
(C) Implementation of image rollovers
(D) Removal of image rollovers

✅ Correct Answer: (C) Implementation of image rollovers

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:37 pm in JavaScript

Q. Consider the following code snippet . What will be the result?

Code:

var a1 = [,,,]; 
var a2 = new Array(3); 
0 in a1 
0 in a2

(A) true false
(B) true true
(C) false true
(D) false true

💬 Discuss

✅ Correct Answer: (A) true false

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:37 pm in JavaScript

Q. The pop() method of the array does which of the following task ?

(A) decrements the total length by 1
(B) increments the total length by 1
(C) prints the first element but no effect on the length
(D) None

💬 Discuss

✅ Correct Answer: (A) decrements the total length by 1

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:38 pm in JavaScript

Q. When is JavaScript called obtrusive?

(A) JavaScript code is medium sized
(B) JavaScript code is so large
(C) JavaScript code is so small
(D) All of the mentioned

💬 Discuss

✅ Correct Answer: (B) JavaScript code is so large

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:39 pm in JavaScript

Q. What will be the output of following Javascript code:

Code:

if (!a[i]) continue ;

(A) Skips the undefined elements
(B) Skips the null elements
(C) Skips the non existent elements
(D) All of the mentioned

💬 Discuss

✅ Correct Answer: (D) All of the mentioned

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:41 pm in JavaScript

Q. What will happen if reverse() and join() methods are used simultaneously ?

(A) Reverses and concatenates the elements of the array
(B) Reverses and stores in the same array
(C) Reverses
(D) All of the mentioned

💬 Discuss

✅ Correct Answer: (B) Reverses and stores in the same array

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:42 pm in JavaScript

Q. Which is a possible way of finding all the img elements in the document?

(A) document.images[]
(B) document(images)
(C) document(img)
(D) all of the mentioned

💬 Discuss

✅ Correct Answer: (A) document.images[]

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:42 pm in JavaScript

Q. What will be the output of following Javascript code:

Code:

var a = [1,2,3,4,5];
a.slice(0,3);

(A) Returns [1,2,3]
(B) Returns [1,2,3,4,5]
(C) Returns [4,5]
(D) Returns [1,2,3,4]

💬 Discuss

✅ Correct Answer: (A) Returns [1,2,3]

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:43 pm in JavaScript

Q. What will be the output of following Javascript code:

Code:

var a = []; 
a.unshift(1); 
a.unshift(22);
a.shift(); 
a.unshift(3,[4,5]); 
a.shift(); 
a.shift();
a.shift();

(A) 1
(B) [3,4,5]
(C) [4,5]
(D) Exception is thrown

💬 Discuss

✅ Correct Answer: (A) 1

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:43 pm in JavaScript

Q. Which of the following elements are used to include audio?

(A) video
(B) audio
(C) svg
(D) All of the above

💬 Discuss

✅ Correct Answer: (B) audio

Published by Pradeep Sikarwar ⭐ 9.01K Points at 20-Jun-2022 08:44 pm in JavaScript

JavaScript MCQs with answers Page - 29

Q. What is the purpose of image replacement?

Q. Consider the following code snippet . What will be the result?

Q. The pop() method of the array does which of the following task ?

Q. When is JavaScript called obtrusive?

Q. What will be the output of following Javascript code:

Q. What will happen if reverse() and join() methods are used simultaneously ?

Q. Which is a possible way of finding all the img elements in the document?

Q. What will be the output of following Javascript code:

Q. What will be the output of following Javascript code:

Q. Which of the following elements are used to include audio?

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