Learn JavaScript MCQ Questions with answers and solutions.

A

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Q. Which of the following is the parameter used to invoke the Audio() constructor?

(A) File type
(B) Music type
(C) Both File and Music
(D) None of these

A

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Q. Consider the following code snippet

(A) Prints the contents of each property of o
(B) Returns undefined
(C) All of the mentioned
(D) None of the mentioned

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Q. Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?

(A) o(x,y);
(B) o.m(x) && o.m(y);
(C) m(x,y);
(D) o.m(x,y);

A

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Q. Consider the following code snippet :

Code:

var grand_Total=eval("10*10+5");

(A) 10*10+5
(B) 105 as a string
(C) 105 as an integer value
(D) Exception is thrown

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Q. Do functions in JavaScript necessarily return a value ?

(A) It is mandatory
(B) Not necessary
(C) Few functions return values by default
(D) All of the mentioned

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Q. Consider the following code snippet :

Code:

var tensquared = (function(x) {return x*x;}(10));

(A) Yes, perfectly
(B) Error
(C) Exception will be thrown
(D) Memory leak

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Q. Consider the following code snippet :

(A) 123
(B) 123xyz
(C) Exception
(D) NaN

A

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Q. What is the difference between the two lines given below ?

Code:

!!(obj1 && obj2);
(obj1 && obj2);

(A) Both the lines result in a boolean value “True”
(B) Both the lines checks just for the existence of the object alone
(C) Both the lines result in a boolean value “False”
(D) The first line results in a real boolean value whereas the second line merely checks for the existence of the objects

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Q. Consider the following code snippet : The state stored in d is :

Code:

var c = counter(), d = counter(); 
c.count()
d.count() 
c.reset() 
c.count() 
d.count()

(A) 1
(B) 0
(C) Null
(D) Undefined

A

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Q. Consider the following code snippet:
What does the last statement return ?

Code:

var c = counter(), d = counter(); 
function constfuncs() 
{
    var funcs = [];
    for(var i = 0; i < 10; i++)
        funcs[i] = function() { return i; };
    return funcs;
}
var funcs = constfuncs();
funcs[5]()

(A) 9
(B) 0
(C) 10
(D) None

JavaScript MCQs with answers Page - 27

Q. Which of the following is the parameter used to invoke the Audio() constructor?

Q. Consider the following code snippet

Q. Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?

Q. Consider the following code snippet :

Q. Do functions in JavaScript necessarily return a value ?

Q. Consider the following code snippet :

Q. Consider the following code snippet :

Q. What is the difference between the two lines given below ?

Q. Consider the following code snippet : The state stored in d is :

Q. Consider the following code snippet:
What does the last statement return ?

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JavaScript MCQs with answers Page - 27

Q. Which of the following is the parameter used to invoke the Audio() constructor?

Q. Consider the following code snippet

Q. Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?

Q. Consider the following code snippet :

Q. Do functions in JavaScript necessarily return a value ?

Q. Consider the following code snippet :

Q. Consider the following code snippet :

Q. What is the difference between the two lines given below ?

Q. Consider the following code snippet : The state stored in d is :

Q. Consider the following code snippet: What does the last statement return ?

Add MCQ in this Category

Browse Categories

Q. Consider the following code snippet:
What does the last statement return ?