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

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

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

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

A). number

B). integer

C). float

D). string

What is the purpose of the NaN (Not a Number) value in JavaScript?

A). To represent a number that is not a valid JavaScript number

B). To represent a zero value

C). To represent an infinite value

D). To represent an empty string

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

A). const

B). let

C). var

D). constant

What will be the output of the following code: console.log(parseInt('10.5'));?

A). 10

B). 5

C). '10.5'

D). NaN (Not a Number)

Which symbol is used for string concatenation in JavaScript?

A). +

B). -

C). *

D). /

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

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

A). '55'

B). 10

C). 5

D). '10'

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

A). Hello World

B). Hello + World

C). Hello +World

D). HelloWorld