JavaScript Block Scope Mockest | JavaScript

11.

What does the Temporal Dead Zone (TDZ) refer to?

A). A zone with no variables B). A zone where variables are in memory but not accessible C). A zone where variables are accessible globally D). A zone with limited variable scope

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12.

How can you ensure variable immutability within a block?

A). Declare the variable with var B). Declare the variable with let C). Declare the variable with const D). Assign a default value

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13.

What is the benefit of block scope in loops?

A). It allows variables to be reassigned within each iteration B). It prevents variable hoisting C). It restricts variables to the loop block D). It makes variables globally accessible

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14.

What is the output of console.log(blockVar); outside a block if let blockVar = 'Block'; is declared inside a block?

A). Block B). undefined C). Error D). null

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15.

How can you access a variable declared in an inner block from an outer block?

A). Using the var keyword B). Using the let keyword C). Using the const keyword D). Using the this keyword

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16.

What is the benefit of block scope in JavaScript?

A). It reduces variable conflicts B). It increases global scope C). It simplifies variable declarations D). It makes variables inaccessible

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17.

What is the output of console.log(outerVar); outside outerFunction if let outerVar = 'Outer'; is declared inside outerFunction?

A). Outer B). undefined C). Error D). null

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18.

What is hoisting in JavaScript?

A). Moving variables to the top of their function or global scope B). Making variables undefined C). Creating new variables D). None of the above

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19.

What is lexical scoping in JavaScript?

A). Variables scoped to the entire codebase B). Variables scoped to their functions C). Variables scoped based on their position in the code D). Variables scoped based on their names

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20.

What is the output of console.log(innerVar); outside exampleFunction if let innerVar = 'Hello'; is declared inside exampleFunction?

A). Hello B). undefined C). Error D). null

Answer & Solution Discuss in Board

JavaScript Block Scope Mocktest

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