Are 10 20 30 40 etc consecutive numbers?

Answer 1

Defining "consecutive" as "following continuously in unbroken or logical sequence," it is possible to have many different types of consecutive things: consecutive days, months, odd numbers, even numbers, etc.

The list you have is consecutive, they are consecutive multiples of ten.

Answer 2

No they are not.

Actually, there cannot be any consecutive numbers, only consecutive integers. Between any two numbers there are infinitely many numbers. There can, therefore, be no "next" number and so no consecutive numbers.