Declaring (Creating) JavaScript Variables Mockest | JavaScript

11.

What keyword is used to declare variables in JavaScript?

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

12.

Which of the following statements is true about the let keyword in JavaScript?

A). Variables declared with let have global scope B). Variables declared with let are block-scoped C). let is used to declare constants D). let is used to declare functions

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13.

What is the purpose of using the const keyword in JavaScript?

A). To declare variables with function scope B). To declare variables with block scope C). To declare constants with immutable values D). To declare objects in JavaScript

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14.

Which keyword is used to declare a variable that cannot be reassigned in JavaScript?

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

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15.

What will happen if you try to reassign a value to a constant declared with const in JavaScript?

A). It will throw an error B). It will silently ignore the assignment C). It will convert the variable to let D). It will convert the variable to var

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16.

Which of the following variable names is valid in JavaScript?

A). my variable B). _variable C). 3variable D). variable$

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17.

What is the outcome of console.log(typeof x); if x is declared but not initialized in JavaScript?

A). Undefined B). Null C). Error D). Object

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18.

What does hoisting refer to in JavaScript variable declarations?

A). Declaring a variable multiple times B). Initializing a variable before declaring C). Moving variable declarations to the top D). Using undeclared variables

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19.

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

A). Both have function scope B). Both have block scope C). var has block scope, let has function scope D). var has function scope, let has block scope

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20.

What will console.log(a); output if a is declared outside a function but inside a block using let in JavaScript?

A). It will output the value of a B). It will throw an error C). It will output undefined D). It

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