Block Scope Mockest | JavaScript

1.

What does the const keyword signify in JavaScript?

A). Constant variable B). Mutable variable C). Global variable D). Block-scoped variable

2.

Which of the following statements about const is true?

A). Variables declared with const can be reassigned B). const variables have function scope C). const variables cannot be used in loops D). const variables are block-scoped

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3.

How can you declare a constant named PI with a value of 3.14 in JavaScript using const?

A). const PI = 3.14; B). PI = 3.14; C). let PI = 3.14; D). var PI = 3.14;

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4.

What happens if you try to reassign a value to a constant declared using const?

A). SyntaxError B). TypeError C). ReferenceError D). No error, value is reassigned

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5.

Which of the following statements is true about block scope in JavaScript?

A). Variables declared with let have global scope B). Variables declared with let have function scope C). Variables declared with let are block-scoped D). Variables declared with let are hoisted

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6.

What will be the output of the code above?

A). 10 B). 20 C). Error D). Undefined

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7.

Which of the following statements is true about constants declared using const?

A). They can be reassigned multiple times B). They are hoisted to the top C). They are mutable D). They are immutable

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8.

What is the primary advantage of using block scope in JavaScript?

A). Reducing code size B). Preventing variable hoisting C). Avoiding global variables D). Improving performance

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9.

Which of the following is NOT an example of a block in JavaScript?

A). Function body B). if statement body C). while loop body D). Object literal

Answer & Solution Discuss in Board

10.

What will be the output of the code above?

A). 30 B). 31 C). Error D). Undefined

Answer & Solution Discuss in Board

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