JavaScript Variables Mockest | JavaScript

1.

Which keyword is used to declare a variable in JavaScript?

A). var B). let C). const D). All of the above

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2.

What is the correct syntax for declaring a variable in JavaScript?

A). let myVar = 5; B). myVar let = 5; C). 5 = let myVar; D). let = myVar 5;

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3.

Which of the following is a valid variable name in JavaScript?

A). 2name B). _name C). #name

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4.

What will be the output of the following code?

var x = 5; var y = 6; var z = x + y;

A). 11 B). 11 C). 5 D). 6

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5.

Which of the following is true about 'const' variables in JavaScript?

A). They can be redeclared B). They cannot be reassigned C). They can be reassigned D). They are always undefined

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6.

Which keyword should be used to declare a block-scoped variable?

A). var B). let C). const D). Both let and const

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7.

What will be the output of the following code?

let x; console.log(x);

A). null B). undefined C). 0 D). NaN

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8.

Can variables declared with 'var' be redeclared in the same scope?

A). Yes B). No C). Only inside a function D). Only inside a loop

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9.

Which of the following is NOT a valid variable name in JavaScript?

A). myVar B). $myVar C). _myVar D). 123myVar

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10.

What is hoisting in JavaScript?

A). Function call before declaration B). Variable declared at the top C). Variable and function declaration are moved to the top D). Variable scope

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JavaScript Variables Mocktest

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