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Stuff Every Traveler Should Know

Air travel, passports, security, health and money abroad.

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AhaBulb practice exam: 50 questions, 50 minutes, pass with 40 right (80%).

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  1. How can you tell a driver's license is REAL ID compliant?
    Show the answer

    A star at the top. REAL ID cards are marked with a star at the top. Adults need a REAL ID, passport, or another acceptable ID to fly in the US.

  2. Does TSA require children under 18 to show ID when flying with a companion within the US?
    Show the answer

    No, the companion shows ID. TSA does not require children under 18 to show ID when traveling with a companion within the United States. The adult companion needs acceptable ID.

  3. The EU Entry/Exit System began its progressive start on what date?
    Show the answer

    12 October 2025. The European Commission set 12 October 2025 as the start of the progressive rollout. It became fully operational on 10 April 2026.

All 84 practice questions

The first 50 are free, with the answer, why it's right and the official sources. The other 34 (🔒) are for AhaBulb members. Or play them as a game and track what you've learned.

Show all 84 questions
  1. How can you tell a driver's license is REAL ID compliant?
  2. Does TSA require children under 18 to show ID when flying with a companion within the US?
  3. The EU Entry/Exit System began its progressive start on what date?
  4. The EU Entry/Exit System records which biometric data from non-EU short-stay visitors?
  5. In the TSA 3-1-1 rule, each liquid container in your carry-on can be how large?
  6. How many quart-sized bags of carry-on liquids does the TSA 3-1-1 rule allow per traveler?
  7. Duty free liquids over 3.4 oz in a sealed bag on an international connection must have a receipt from within how long?
  8. With TSA PreCheck, which items can usually stay in your bag at screening?
  9. Children 17 and under can use PreCheck with a PreCheck adult when what appears?
  10. At what age do TSA standard screening procedures apply to children?
  11. Can formula or breast milk over 3.4 ounces go in your carry-on?
  12. How are strollers and car seats screened at the TSA checkpoint?
  13. Rechargeable lithium batteries above what capacity are not allowed on passenger aircraft?
  14. Where must spare lithium batteries and power banks go on an airplane?
  15. Rechargeable batteries up to what Wh need no airline approval?
  16. A 12-volt battery rated at 8 amp hours has how many watt hours?
  17. E-cigarettes and vape devices belong in which type of baggage?
  18. How many spare 101 to 160 Wh lithium batteries may a passenger carry (with airline approval)?
  19. Can you fly with a damaged or recalled battery that could spark?
  20. On a flight, your device or battery starts smoking or swelling. What should you do first?
  21. Can battery-powered luggage trackers like AirTags go in checked bags?
  22. If an airline cancels your flight, are you entitled to a refund?
  23. CDC says an emergency medical evacuation from a remote place could cost more than how much?
  24. Long flights can raise the risk of blood clots. How long is a flight CDC flags as raising risk?
  25. To make it easier to walk during a long flight, what seat does CDC suggest?
  26. Does CDC recommend taking aspirin to prevent blood clots on a trip?
  27. You are flying east across many time zones. Before you go, CDC suggests going to bed...
  28. To handle jet lag before an important event, CDC suggests arriving at least how early?
  29. If you are sleepy in the daytime from jet lag, how long should a nap be, per CDC?
  30. To avoid traveler's diarrhea, CDC says to eat only foods that are...
  31. Why does CDC say to avoid ice in places with unsafe tap water?
  32. The first thing to do for traveler's diarrhea, per CDC, is to...
  33. Why are sealed carbonated drinks usually safe abroad, according to CDC?
  34. Per CDC, raw seafood "cooked" in citrus juice, like ceviche, is...
  35. Why does CDC say not to drink restaurant fountain sodas where tap water is unsafe?
  36. How long should you boil water to make it safe at normal elevations, per CDC?
  37. Most portable water filters on trips remove parasites. What do they NOT reliably remove?
  38. Who should NOT drink water disinfected with iodine, per CDC?
  39. Where should you pack your medicines when you fly, per CDC?
  40. How should prescription medicines be kept when you travel?
  41. Crossing time zones, how should you time doses, per CDC?
  42. CDC says about what share of medicines in low and middle income countries are counterfeit?
  43. If you use both sunscreen and insect repellent, which goes on first?
  44. Does getting a "base tan" before vacation protect you from the sun?
  45. CDC says a travel mosquito net should be what color and shape?
  46. Where should permethrin products NEVER be applied?
  47. CDC says oil of lemon eucalyptus repellents should not be used on children under what age?
  48. At high elevation, what should you do if altitude sickness symptoms get worse while resting?
  49. To lessen motion sickness, which seats does CDC suggest?
  50. If caught in a rip current, which way should you swim first?
  51. How long should you wait to fly after a single no-decompression dive? 🔒
  52. CDC says to avoid which behavior around animals abroad? 🔒
  53. What is a key warning sign of heat stroke versus heat exhaustion? 🔒
  54. Can hypothermia happen at mild temperatures around 50 degrees F? 🔒
  55. How soon after vaccination is a yellow fever certificate valid? 🔒
  56. What alcohol strength should hand sanitizer in a travel health kit have, per CDC? 🔒
  57. If there is no sidewalk, which side of the road should you walk on, per CDC? 🔒
  58. How far ahead of a trip does CDC suggest seeing a health provider about vaccines and medicines? 🔒
  59. On a cruise, how does CDC say to help prevent norovirus-type stomach illness? 🔒
  60. Which kind of vaccines may need a booster before travel, according to CDC? 🔒
  61. On a prepaid card, how is a foreign transaction fee usually charged? 🔒
  62. Can you be charged a foreign transaction fee without leaving the US? 🔒
  63. The EU's ETIAS travel authorisation is meant for visa-free visitors on short stays of up to how long? 🔒
  64. Mobile Passport Control apps help you speed through US arrival. What does CBP say about their cost? 🔒
  65. Besides faster US customs, what else do Global Entry members get? 🔒
  66. How early can you apply to renew your Global Entry membership, according to CBP? 🔒
  67. Is it illegal to carry more than $10,000 in cash into or out of the United States? 🔒
  68. You return to the US with fruit and a jar of homemade sauce in your bag. What does CBP say to do? 🔒
  69. A foreign shop offers to charge your card in dollars, not local currency. What does Visa say that offer includes? 🔒
  70. According to the FCC, what may help you avoid data roaming charges abroad? 🔒
  71. Which easy-to-forget action can trigger roaming charges abroad, according to the FCC? 🔒
  72. Thieves already used your lost debit card. You report it within 2 business days of noticing. What is your maximum loss? 🔒
  73. A US appliance made only for 110V goes to the UK, where outlets give 240V. What does it need? 🔒
  74. TSA's travel checklist says not to pack box cutters, utility knives and razors where? 🔒
  75. At a US sit-down restaurant, what tip is expected for satisfactory service? 🔒
  76. You finish a great dinner in Tokyo. What is the local custom about tipping? 🔒
  77. What voltage do wall outlets in Japan supply? 🔒
  78. Your phone charger's label says Input 100-240V. What do you need to use it in Europe? 🔒
  79. Your US plan has unlimited data at home. Per the FCC, what may happen when you use data abroad? 🔒
  80. If your phone can take one, what does a local SIM card bought abroad do? 🔒
  81. To use a local phone company's eSIM abroad, what must be true of your phone? 🔒
  82. You use your US debit card at a foreign ATM. Who will most likely charge you a fee? 🔒
  83. When you need cash abroad, which ATM is usually the safer choice? 🔒
  84. Where does UC San Diego's study abroad office say you usually get the best currency exchange rate? 🔒