JavaScript Variables Mockest | JavaScript

1.

What is the keyword used to declare variables in JavaScript?

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

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2.

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

A). _myVariable B). 2ndVariable C). $myVariable D). my-Variable

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3.

What happens if you declare a variable without initializing it in JavaScript?

A). It will throw a syntax error B). It will assign the variable a value of undefined C). It will automatically assign a value to the variable D). It will assign the variable a value of null

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4.

Which keyword is used to declare a constant variable in JavaScript?

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

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5.

What is the scope of a variable declared using the let keyword in JavaScript?

A). Block scope B). Function scope C). Global scope D). Local scope

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6.

What will be the value of x after the following code executes: let x = 10; x += 5;?

A). 15 B). 5 C). 10 D). undefined

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7.

Which variable declaration is appropriate if you want a variable to hold a constant value throughout the program execution?

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

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8.

What will be the output of the following code: console.log(typeof 'Hello');?

A). string B). number C). undefined D). boolean

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9.

Which data type is used to represent whole numbers in JavaScript?

A). number B). integer C). float D). string

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10.

What is the value of x after the following code executes: let x = 5; x *= 2; x /= 3;?

A). 04-Oct B). 6666666666667 C). 5 D). undefined

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JavaScript Variables Mocktest

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