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JavaScript Questions & Answers – Closures | JavaScript Multiple Choice Questions and Answers

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Free download in PDF JavaScript Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) What kind of scoping does JavaScript use?
[A] Literal
[B] Lexical
[C] Segmental
[D] Sequential
Answer: Lexical
(2) 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] Return the value
Answer: Reference the current scope chain

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(3) What is closure?
[A] Function objects
[B] Scope where function’s variables are resolved
[C] Both Function objects and Scope where function’s variables are resolved
[D] Function return value
Answer: Both Function objects and Scope where function’s variables are resolved
(4) Which of the following is not an example of closures?
[A] Objects
[B] Variables
[C] Functions
[D] Graphics
Answer: Graphics
(5) Which of the following uses a lot of CPU cycles?
[A] GUI
[B] Statically generated graphics
[C] Dynamically generated graphics
[D] Generic scoping
Answer: Dynamically generated graphics
(6) What will be the function of the following JavaScript code? 
var scope = "global scope";
function checkscope() 
{
    var scope = "local scope"; 
    function f() 
    { 
         return scope; 
    }
    return f;
}
[A] Returns value null
[B] Returns exception
[C] Returns the value in scope
[D] Shows an error message
Answer: Returns the value in scope
(7) What is the fundamental rule of lexical scoping?
[A] Functions are declared in the scope
[B] Functions are executed using scope chain
[C] Functions are declared outside the scope
[D] Variables are declared within the function
Answer: Functions are executed using scope chain
(8) What is the opposite approach to the lexical scoping?
[A] Literal scoping
[B] Static scoping
[C] Dynamic scoping
[D] Generic scoping
Answer: Dynamic scoping
(9) What is the purpose of the dynamic scoping?
[A] Variables can be declared outside the scope
[B] Variables must be declared outside the scope
[C] Variables cannot be declared outside the scope
[D] Variable cannot be declared within the function
Answer: Variables can be declared outside the scope
(10) Which of the algorithmic languages is not lexical scoping standardized in?
[A] Ada
[B] Pascal
[C] Modula2
[D] Html
Answer: Html

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