Learn JavaScript MCQ Questions with answers and solutions.

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Q. What kind of scoping does JavaScript use?

(A) Literal
(B) Lexical
(C) Segmental
(D) Sequential

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Q. What must be done in order to implement Lexical Scoping?

(A) Get the object
(B) Dereference the current scope chain
(C) Reference the current scope chain
(D) None of the mentioned

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Q. The function definitions in JavaScript begins with

(A) Identifier and Parantheses
(B) Return type and Identifier
(C) Return type, Function keyword, Identifier and Parantheses
(D) Identifier and Return type

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Q. Consider the following code snippet
function printprops(o)
{
for(var p in o)
console.log(p + ": " + o[p] + "n");
}
What will the above code snippet result ?

(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. When does the function name become optional in JavaScript?

(A) When the function is defined as a looping statement
(B) When the function is defined as expressions
(C) When the function is predefined
(D) All of the mentioned

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Q. What is the purpose of a return statement in a function?

(A) Returns the value and continues executing rest of the statements, if any
(B) Returns the value and stops the program
(C) Returns the value and stops executing the function
(D) Stops executing the function and returns the value

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Q. What will happen if a return statement does not have an associated expression?

(A) It returns the value 0
(B) It will throw an exception
(C) It returns the undefined value
(D) None of the mentioned

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Q. A function with no return value is called

(A) Procedures
(B) Method
(C) Static function
(D) Dynamic function

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Q. Consider the following code snippet
function hypotenuse(a, b)
{
function square(x)
{
return x*x;
}
return Math.sqrt(square(a) + square(b));
}
What does the above code result?

(A) Sum of square of a and b
(B) Square of sum of a and b
(C) Sum of a and b square
(D) None of the mentioned

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Q. Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?

(A) var strict = (function { return this; });
(B) mode strict = (function() { return !this; }());
(C) var strict = (function() { return !this; }());
(D) mode strict = (function { });

JavaScript MCQs with answers Page - 66

Q. What kind of scoping does JavaScript use?

Q. What must be done in order to implement Lexical Scoping?

Q. The function definitions in JavaScript begins with

Q. Consider the following code snippet
function printprops(o)
{
for(var p in o)
console.log(p + ": " + o[p] + "n");
}
What will the above code snippet result ?

Q. When does the function name become optional in JavaScript?

Q. What is the purpose of a return statement in a function?

Q. What will happen if a return statement does not have an associated expression?

Q. A function with no return value is called

Q. Consider the following code snippet
function hypotenuse(a, b)
{
function square(x)
{
return x*x;
}
return Math.sqrt(square(a) + square(b));
}
What does the above code result?

Q. Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?

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JavaScript MCQs with answers Page - 66

Q. What kind of scoping does JavaScript use?

Q. What must be done in order to implement Lexical Scoping?

Q. The function definitions in JavaScript begins with

Q. Consider the following code snippet function printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "n"); } What will the above code snippet result ?

Q. When does the function name become optional in JavaScript?

Q. What is the purpose of a return statement in a function?

Q. What will happen if a return statement does not have an associated expression?

Q. A function with no return value is called

Q. Consider the following code snippet function hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b)); } What does the above code result?

Q. Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?

Add MCQ in this Category

Browse Categories

Q. Consider the following code snippet
function printprops(o)
{
for(var p in o)
console.log(p + ": " + o[p] + "n");
}
What will the above code snippet result ?

Q. Consider the following code snippet
function hypotenuse(a, b)
{
function square(x)
{
return x*x;
}
return Math.sqrt(square(a) + square(b));
}
What does the above code result?