USPS EXAM 421 WINDOW CLERK TEST 2025 STUDY GUIDE Latest 2025/2026 COMPLETE FREQUENTLY MOST TESTED QUESTIONS WITH COMPLETE SOLUTION /GET IT 100% ACCURATE!(Graded A+)

USPS EXAM 421 WINDOW CLERK TEST STUDY
GUIDE
QUESTIONS AND VERIFIED ANSWERS/
A+ GRADE


1. MAILABILITY: DETERMINING IF AN ITEM PRESENTED FOR MAILING CAN BE ADM
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ITTED INTO MAILSTREAM IS AN IMPORTANT PART OF YOUR JOB.
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2. FCM: FIRST-CLASS MAIL
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3. NONMAILABLE: MEANS THE PIECE, AS DESIGNED, IS PROHIBITED FROM THE M
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AILSTREAM.



4. ALL MAILPIECES ENTERING THE MAILSTREAM ARE SEPARATED INTO ONE
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OF THESE THREE PROCESSING CATEGORIES: LETTERS.term- 4 FLATS.
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PARCELS (MACHINABLE, IRREGULAR, NONMACHINABLE PARCEL).
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5. NONMACHINABLE LETTER CHARACTERISTICS: FCM LETTER- g g g g




SIZED PIECES THAT MEET ONE OR MORE NONMACHINABLE CHARACTERISTICS
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ARE EXCLUDED FROM AUTOMATED PROCESSING, THEY ARE HANDLED
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, MANUALLY & SUBJECT TO SURCHARGE. THIS DOES NOT APPLY TO POST- CARDS.
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6. THREE TYPES OF PARCELS: MACHINABLE, IRREGULAR, & NONMACHIN- ABLE
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7. MACHINABLE PARCELS MUST WEIGHT AT LEAST g g g g g




OUNCES, BUT NO MORE THANg g g g .: SIX; 25
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8. IRREGULAR PARCELS CHARACTERISTICS: ROLLS & TUBES 26" LONG OR LESS
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LESS THAN 6"L X 3"H. LESS THAN 6
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OUNCES.


9. HAZMAT QUESTION: "DOES YOUR ITEM CONTAIN ANYTHING LIQUID, FRAGIL
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E, PERISHABLE, OR POTENTIALLY HAZARDOUS SUCH AS LITHIUM, BATTERIES, OR
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MERCURY?"


10. POSTER 138: TO ASSIST WITH DETERMINING IF A CUSTOMER'S PACK-
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g AGE MAY BE ACCEPTED.
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11. CONSUMER COMMODITY: CLASS 2: GLASS CLAS g g g g g




S 3: FLAMMABLE/COMBUSTIBLE LIQUIDS CLASS 4: F
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LAMMABLE SOLIDS g




CLASS 6:TOXIC MATERIALS g g g




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