It is on the interval scale.
Occupation is nominal data. There is not an order to the category occupation, so that eliminates ordinal and interval.
Three basic levels of measurement are nominal, ordinal, and interval/interval-ratio.
nominal
ratio
The IQ scale is considered interval because the differences between scores are standardized and consistent across the range of scores. This means that a difference of 10 points on the IQ scale represents the same change in intelligence level regardless of where on the scale it occurs.
the level of measurement is interval
Ordinal.
ordinal
It is on the interval scale.
ordinal
interval
Nominal Scale < Ordinal< Interval < Ratio
Occupation is nominal data. There is not an order to the category occupation, so that eliminates ordinal and interval.
ordinal
It is ordinal.
Ordinal. Though more likely interval or even ratio scale.