Javascript Multiple Choice Questions and Answers Closures

(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

(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

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

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