JavaScript Block Scope Mockest | JavaScript

1.

What is block scope in JavaScript?

A). Variables scoped globally B). Variables scoped within a function C). Variables scoped to a block D). Variables scoped to an object

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2.

Which keyword introduces block-scoped variables in JavaScript?

A). var B). let C). const D). function

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3.

What is the main difference between var and let in terms of scope?

A). var is block-scoped, let is function-scoped B). var is function-scoped, let is block-scoped C). Both var and let are block-scoped D). Both var and let are function-scoped

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4.

What happens if you try to access a block-scoped variable outside its block?

A). The variable is accessible globally B). The variable is accessible within its block C). An error occurs D). The variable is accessible within a function

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5.

Which of the following correctly defines a block scope?

A). A scope that encompasses the entire codebase B). A scope that encompasses a function C). A scope that encompasses a block of code delimited by curly braces D). A scope that encompasses an object

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6.

How does block scope help prevent variable hoisting issues?

A). By moving variables to the top of the code B). By restricting variables to their block C). By making variables accessible globally D). By assigning default values to variables

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7.

What is the output of console.log(i); outside the loop if let i = 10; is declared inside a loop?

A). 10 B). undefined C). Error D). 0

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8.

What happens when you declare a constant with const inside a block and try to reassign it?

A). It throws an error B). It allows reassignment C). It assigns the value globally D). It assigns a default value

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9.

How does block scope affect the visibility of variables in nested blocks?

A). Variables are only visible within their immediate block B). Variables are visible within all nested blocks C). Variables are only visible within functions D). Variables are globally visible

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10.

What is the purpose of block scope in JavaScript?

A). To limit the visibility and accessibility of variables B). To make variables global C). To create constants D). To execute functions

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JavaScript Block Scope Mocktest

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