MCQ 1 What will be the output of the following JavaScript code?

var myvar = Boolean('false');
document.getElementById ("demo").innerHTML = myvar;

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

MCQ 2 Variable declared is example of ________________ Variable.

function message() {
var varname = "Rajiv";
alert(name);
}

(A) Local (B) Local (C) semi-global (D) All of the above

MCQ 3 What is the output of the following code?

<script language="javascript">
function x()
{
document.write(2+5+"8");
}
</script>

(A) 258 (B) 7 (C) 78 (D) error

MCQ 4 Which tag(s) can handle mouse events in Netscape?

(A) < br > tag (B) < a > tag (C) < span > tag (D) < img > tag

MCQ 5 What if you use parseInt() to convert a string containing decimal value?

(A) Throws Error (B) If returns only the integer portion of the number (C) It returns the decimal values in string form (D) None of the above

MCQ 6 Javascript Addition : Addition is

document.write("1 plus 1 is " + 1 + 1);

(A) 1 plus 1 is 1 + 1 (B) 1 plus 1 is 11 (C) 1 plus 1 is 2 (D) 2

MCQ 7 What will be the output of the following JavaScript code?

num1=5;
function cal() {
num1=10;
num2=5;
num3=num2*num1;
console.log(num3);
}
cal();

(A) 25 (B) 50 (C) 100 (D) error

MCQ 8 Which of the following method checks if its argument is not a number?

(A) isNaN() (B) nonNaN() (C) NaN() (D) None of the above

MCQ 9 Which is the correct way to write a JavaScript array?

(A) var website = new Array(1 : "Online", 2 : "Education", 3 : "knowledgeuniverseonline.com") (B) var website = new Array : 1 = ("Online") 2 = ("Education") 3 = ("knowledgeuniverseonline.com") (C) var website = new Array("Online", "Education", "knowledgeuniverseonline.com") (D) var website = new Array="Online", "Education", "knowledgeuniverseonline.com")

MCQ 10 State whether the following statements are True or False for strict equality operator(= = =).

• If the two values have different types they are equal.
• If both values are null or both values are undefined, they are equal.
<

(A) False True (B) True False (C) True True (D) False False

Correct Answer Choice A False True
See Answer

MCQ 11 Which of the following attribute can hold the JavaScript version?

(A) language (B) version (C) script (D) None of the above

MCQ 12 Which of the following is not a valid JavaScript variable name?

(A) 2varaiblename (B) _firstvariable (C) myvariable12 (D) None of the above

MCQ 13 JavaScript is interpreted by _________

(A) Client (B) Server (C) Object (D) None of the above

MCQ 14 If the operator value is null, then the unary operator returns the type of _____________

(A) undefined (B) string (C) object (D) boolean

MCQ 15 Which operator is known as the strict equality operator, which checks whether its two operators are identical or not?

(A) = (B) == (C) && (D) ===

MCQ 16 JavaScript can be written __________

(A) directly into JS file and included into HTML (B) directly on the server page (C) directly into HTML pages (D) directly into the css file

MCQ 17 what is the disadvantage of using innerHTML in JavaScript?

(A) Content can not be replaced everywhere (B) Even if you use +=like "innerHTML = innerHTML + 'html'" still the old content is replaced by html (C) The entire innerHTML content is not re-parsed and build into elements, therefore its not slower (D) We can use like "appending to innerHTML"

MCQ 18 Which operator is known as the equality operator, which checks whether its two operators are "equal"?

(A) = (B) == (C) && (D) ===

MCQ 19 What is the default value of the asyc attribute?

(A) True (B) False (C) 0 (D) 1

MCQ 20 What will be the output if we compare "ten" and 10 with less then comparison operator( "ten" <10)?

(A) True (B) False (C) undefined (D) error

MCQ 21 When a class B can extend another class A, we say that:

(A) Both A and B are the subclass (B) B is the superclass and A is the subclass (C) Both A and B are the superclass (D) A is the superclass and B is the subclass

MCQ 22 Which of the following is not considered a JavaScript operator?

(A) new (B) this (C) delete (D) typeof

MCQ 23 Which operator will return false if two value are equal?

(A) ! (B) != (C) !== (D) All of the above

MCQ 24 If var A = {B : 3, C : 5}, how to use the delete operator to delete one of the properties of an object.

(A) delete (B) delete A (C) delete A.B (D) Delete A[0]

MCQ 25 What is the purpose of script loading?

(A) Load JavaScript files programmatically (B) Load JavaScript files manually (C) Load Scripts programmatically (D) All of the mentioned

MCQ 26 What if we put ++ operator inside if condition? find the output
<script>
var a = 10;
if(a == a++)
document.write(a);
</script>

(A) Error (B) 10 (C) 1010 (D) 11

MCQ 27 What is mean by "this" keyword in javascript?

(A) It is variable which contains value (B) It refers current object (C) It refers its parent object (D) It referes previous object

MCQ 28 What does the following JavaScript data.sort(function(a, b), b- a) do?

(A) Sort in the chronological order (B) Sort in reverse alphabetical order (C) Sort in reverse numerical order (D) Sort in the alphabetical order

MCQ 29 Which symbol is used for comments in Javascript?

(A) \\ (B) // (C) \* *\ (D) /* */

MCQ 30 What is defination of an undefined value in JavaScript?

(A) Property doesn't exist (B) Variable is not assigned to any value (C) Variable used in the code doesn't exist (D) All of the above