What will be the result of using a reserved word as an identifier?

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

Which characters are allowed in JavaScript identifiers?

A). Letters only

B). Letters and numbers only

C). Letters, numbers, $ and _

D). Any special characters

Can an identifier be a single character?

A). Yes

B). No

C). Only in ES5

D). Only in ES6

What will the following code output: var x; x = 5; var y = x;

A). undefined

B). null

C). 5

D). x

Which of these is an invalid identifier?

A). foo_bar

B). fooBar

C). foo-bar

D). foo$bar

What is a valid identifier in JavaScript?

A). 123abc

B). abc123

C). let

D). var

Which of the following is a valid identifier name?

A). var

B). 123abc

C). _123abc

D). #abc123

Which of the following is a valid identifier?

A). if

B). else

C). null

D). value1

Are JavaScript identifiers case-sensitive?

A). Yes

B). No

C). Only in ES6

D). Only in strict mode

What is the maximum length of an identifier?

A). 255 characters

B). 31 characters

C). 64 characters

D). No limit