27 4-21. Which of the following matter may NOT be affixed to the back of a post card? 1.     Merchandise samples 2. Photographs 3.     News clippings 4.     Labels   4-22. Which, if any, of the following is the correct minimum size limit for post cards mailed to a foreign country? 1. 4 1/4 inches by 6 inches 2. 3 1/2 inches by 5 inches 3. 3 1/2 inches by 5 1/2 inches 4.     None of the above   4-23. Aerogrammes with enclosures on which postage has not been paid at the airmail letter rate must be sent as surface mail. 1. True 2.     False   4-24. Postal union printed matter is divided into what specific number of categories? 1. One 2.     Two 3. Three 4.     Four   4-25. Which of the following is NOT a authorized endorsement for printed matter? 1.     BOOKSPRINTED MATTER 2.     PRINTED MATTER 3.     PRINTED MATTERBOOKS 4.     PRINTED MATTERSHEET MUSIC   4-26. Matter for the blind articles has what maximum weight limit? 1.     5 pounds 2.     10 pounds 3.     15 pounds 4.     20 pounds 4-27. Articles accepted as matter for the blind must be prepared in such a way that the contents are protected but inspection of the contents is not hindered. 1. True 2.     False   4-28. Matter for the blind accepted as surface mail must be unsealed and in the upper right corner have what notation? 1.     MATTER FOR THE BLIND 2.     FREE above MATTER FOR THE BLIND 3.     POSTAL UNION above MATTER FOR THE BLIND 4.     MATTER FOR THE BLIND above FREE   4-29. Which of the following items may be enclosed inside a small packet? 1.     Jewelry 2.     Coins 3.     Video tapes 4.     Paper Money   4-30. Which of the following articles may NOT be included in small packets? 1.     Phonographic records 2.     Sound tapes 3.     Personal correspondence 4.     Magnetic tapes   4-31. Whether or not they are subject to customs inspection, small packets must bear which of the following customs forms? 1.     PS Form 2976 2.     PS Form 2976-A 3.     Either 1 or 2 above 4.     None of the above