There is no such thing as scientific digits. There are 6 digits in the number of which 3 are SIGNIFICANT (not scientific) digits.
There are three significant digits. I am not sure what scientific digits are!
There is no way to know how many significant digits are in 33000. If you are forced to choose then there are 2 significant digits but, again, there is really no way to tell. If the count of significant digits is important, the number should be expressed in scientific notation.
One
one
scientific it is called digits
In scientific notation, you should have only one digit to the left of the decimal point.
Yes they are, if they are large numbers. You do not need to count how many digits there are.
One digit
In scientific notation that number would be written as 7.080 x 10-3 and it would have four significant digits.
It is the number of digits in the mantissa.
Because less digits are needed in scientific notation to represent very large numbers.