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

Questions
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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