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

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(typeof 'Hello');?

A). string

B). number

C). undefined

D). boolean

Which statement correctly assigns the value true to a boolean variable isLogged in JavaScript?

A). let isLogged = 'true';

B). let isLogged = true;

C). let isLogged = 1;

D). let isLogged = 0;

What is the purpose of using the === operator in JavaScript?

A). Strict equality comparison

B). Loose equality comparison

C). Assignment operator

D). Addition operator

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)

What is the keyword used to declare variables in JavaScript?

A). let

B). variable

C). var

D). const

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 symbol is used for string concatenation in JavaScript?

A). +

B). -

C). *

D). /

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

A). number

B). integer

C). float

D). string

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