USPS - Error Detection Test Error Detection Mail Processor 1 — Questions and Answers
Question 1: A mail piece shows the return address state as 'CA' but the ZIP code is 73301, which belongs to Texas. What type of error does this represent?
- Transposed digit error
- State-ZIP mismatch error (Correct answer)
- Illegible handwriting error
- Missing apartment number error
Correct answer: State-ZIP mismatch error
ZIP code 73301 is assigned to Austin, TX, not California. When the written state abbreviation conflicts with the geographic region of the ZIP code, this is a state-ZIP mismatch error that a mail processor must flag.
Question 2: An envelope addressed to '88 Wisteria Ln, Springfield, IL 62702' has a barcode that decodes to '88 Wisteria Lane, Springfield, IL 62701'. Which element contains the discrepancy?
- Street number
- Street name
- City and state
- ZIP code (Correct answer)
Correct answer: ZIP code
All elements match except the ZIP code: the printed address shows 62702 while the barcode encodes 62701. A mail processor must catch barcode-to-address mismatches at the ZIP code level.
Question 3: A mail processor reads the address '4O7 Birchwood Ave' and notices something unusual. What is the most likely error?
- Transposed street numbers
- A letter substituted for a digit in the address number (Correct answer)
- An incorrect ZIP code
- A missing directional prefix
Correct answer: A letter substituted for a digit in the address number
The character 'O' (the letter O) has been written or printed in place of '0' (zero), making the house number read '4O7' instead of '407'. This is a character-substitution error common in handwritten or low-quality printed mail.
Question 4: Which of the following ZIP codes contains a formatting error that would prevent automated processing?
- 90210
- 10001
- 3O2l4 (Correct answer)
- 33101
Correct answer: 3O2l4
ZIP code '3O2l4' contains the letter O in place of a zero and the letter l (lowercase L) in place of a 1, making it '3O2l4' rather than the valid '30214'. Automated systems cannot process codes that mix alphabetic characters with digits.
Question 5: A flat-tray of mail is being sorted and one piece shows the destination as '1138 Sunet Blvd, Los Angeles, CA 90028'. What error should the processor flag?
- Incorrect city name
- Misspelled street name (Correct answer)
- Wrong state abbreviation
- Invalid ZIP code for Los Angeles
Correct answer: Misspelled street name
The street name is spelled 'Sunet' instead of the correct 'Sunset'. This is a typographical omission error in the street name that could cause misdelivery or return to sender.
Question 6: A mail processor sees two pieces addressed to '512 Maple Dr, Denver, CO 80203' and '521 Maple Dr, Denver, CO 80203'. The intended recipient is at 512. What category of error would cause the second piece to be misrouted?
- Missing unit number
- Transposed digits in the street number (Correct answer)
- State abbreviation error
- ZIP+4 discrepancy
Correct answer: Transposed digits in the street number
The digits '12' in 512 have been transposed to '21', producing 521. Transposed digit errors in house numbers are a leading cause of misdelivery and must be caught during the error detection stage.
USPS - Error Detection Test Error Detection Mail Processor 1
A mail piece shows the return address state as 'CA' but the ZIP code is 73301, which belongs to Texas.
What type of error does this represent?