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Deck · 3,245 questions

Safety - USCG Exam Questions

Firefighting, lifesaving appliances and survival craft, emergency procedures, first aid, and pollution prevention regulations.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Safety questions

Questions 501–600 of 3,245 · page 6 of 33

  1. #589 A crew member suddenly becomes blind in both eyes. Which code should your message contain?
  2. #591 Which toxic gas is a product of incomplete combustion, and is often present when a fire burns in a closed compartment?
  3. #592 A fire starting by spontaneous combustion can be expected in which condition?
  4. #593 Oily rags stored in a pile that is open to the atmosphere are a hazard because they may __________.
  5. #594 The minimum concentration of a vapor in air which can form an explosive mixture is called the __________.
  6. #595 Accumulations of oily rags should be __________.
  7. #596 A fuel-air mixture below the lower explosive limit is too __________.
  8. #597 The midships house of your break bulk ship is constructed with an interior stair tower from the main deck to the bridge. Under what circumstances may...
  9. #598 In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by __________.
  10. #599 Fire may be spread by which means?
  11. #600 Convection spreads a fire by __________.
  12. #601 Radiation spreads a fire by __________.
  13. #602 The spread of fire is prevented by __________.
  14. #603 To prevent the spread of fire by convection you should __________.
  15. #604 To prevent the spread of fire by conduction you should __________.
  16. #605 The spread of fire is NOT prevented by __________.
  17. #606 Ventilation systems connected to a compartment in which a fire is burning are normally closed to prevent the rapid spread of the fire by __________.
  18. #607 The atmosphere in a tank is too rich when it is __________.
  19. #608 The atmosphere in a tank is too lean if it is __________.
  20. #609 What is the generally accepted method of determining whether the atmosphere within a cargo tank is explosive, too rich, or too lean to support combust...
  21. #610 The explosive range of petroleum vapors mixed with air is __________.
  22. #611 Small quantities of flammable liquids needed at a work site should be __________.
  23. #612 Paints and solvents on a vessel should be __________.
  24. #613 The hoods over galley ranges present what major hazard?
  25. #614 Which of the following when removed will extinguish a fire?
  26. #615 What is required in addition to the heat, fuel, and oxygen of the fire triangle to have a fire?
  27. #616 All of the following are part of the fire triangle EXCEPT __________.
  28. #617 Except in rare cases, it is impossible to extinguish a shipboard fire by __________.
  29. #618 Normally, the percentage of oxygen in air is __________.
  30. #619 The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called __________.
  31. #620 Which condition is necessary for a substance to burn?
  32. #621 The vapor pressure of a substance __________.
  33. #622 You have carbon tetrachloride as part of the cargo. If a fire breaks out in the general area, what is the major danger from the carbon tetrachloride?
  34. #623 Which statement describes the relationship between flash point and auto-ignition temperature?
  35. #624 The "flammable limits" of an atmosphere are the __________.
  36. #625 The explosive range of Bunker C mixed with air is __________.
  37. #626 The explosive range of Diesel Oil mixed with air is __________.
  38. #627 The flammable limit of methyl ethyl ketone is from __________.
  39. #628 The flash point of a liquid means the temperature __________.
  40. #629 Which statement is TRUE concerning the "flash point" of a substance?
  41. #630 You should be most concerned about a possible explosion or fire in fuel tanks __________.
  42. #631 The volatility of a flammable liquid is indicated by its __________.
  43. #632 Spontaneous combustion is most likely to occur in __________.
  44. #633 Spontaneous combustion is caused by __________.
  45. #634 Which substance might be subject to spontaneous combustion?
  46. #635 What is the maximum oxygen content below which flaming combustion will no longer occur?
  47. #636 Storage batteries should be charged in a well ventilated area because __________.
  48. #637 What is LEAST likely to cause ignition of fuel vapors?
  49. #638 Spontaneous ignition can result from __________.
  50. #639 Which may ignite fuel vapors?
  51. #640 The accumulation of dangerous fumes generated by the storage batteries is best prevented by __________.
  52. #641 Automatic fire dampers in ventilation systems are operated by use of __________.
  53. #642 Automatic fire dampers in ventilation systems are operated by use of a __________.
  54. #643 Spaces containing batteries require good ventilation because __________.
  55. #644 The primary reason for placing covers over storage batteries is to __________.
  56. #645 When flammable liquids are handled in a compartment on a vessel, the ventilation for that area should be __________.
  57. #646 It is necessary to secure the forced ventilation to a compartment where there is a fire to __________.
  58. #647 In battery charging rooms, exhaust ventilation should be provided __________.
  59. #648 Fighting a fire in the galley poses the additional threat of __________.
  60. #649 The ventilation system of your ship has fire dampers restrained by fusible links. Which statement is TRUE?
  61. #651 Fire dampers prevent the spread of fire by __________.
  62. #652 Blocking open or removing fire dampers can cause __________.
  63. #653 The best method of extinguishing a class A fire is to __________.
  64. #654 The main advantage of a steady stream of water on a class "A" fire is that it __________.
  65. #655 A fire in a pile of canvas is classified as class __________.
  66. #656 A fire in a pile of dunnage would be classified as class __________.
  67. #657 A fire in trash and paper waste is classified as class __________.
  68. #658 Burning wood is which class of fire?
  69. #659 A fire in a pile of linen is a class __________.
  70. #660 What would be the most effective agent to use to extinguish a fire in drums of flammable liquids stowed on the weather deck of a vessel?
  71. #661 Which extinguishing agent is suitable to combat a class B fire in an engine compartment?
  72. #662 When choosing extinguishers to fight a Class "B" fire do NOT use __________.
  73. #663 A large oil fire on the deck of a ship can be fought most effectively with __________.
  74. #664 On a class "B" fire, which portable fire extinguisher would be the LEAST desirable?
  75. #665 A class B fire is most successfully fought by __________.
  76. #666 The class of fire on which a blanketing effect is essential is class __________.
  77. #667 An oil fire is classified as class __________.
  78. #668 A galley grease fire would be classified as which class of fire?
  79. #669 If ignited, which material would be a class B fire?
  80. #670 Which of the following classifications does an oil fire belong to?
  81. #671 Foam is effective in combating which class(es) of fire?
  82. #672 A fire in electrical equipment should be extinguished by using __________.
  83. #673 Which types of portable fire extinguishers are designed for use on electrical fires?
  84. #674 Fire extinguishing agents used on Class C fires must be __________.
  85. #675 What is the most important characteristic of the extinguishing agent in fighting a class "C" fire?
  86. #676 Which extinguishing agent is the best for use on electrical fires?
  87. #677 Which types of portable fire extinguishers are designed for putting out electrical fires?
  88. #678 Any extinguishing agent used on a Class "C" fire must have which important property?
  89. #679 Fires of which class would most likely occur in the engine room of a vessel?
  90. #680 A fire starts in a switchboard due to a short circuit. This is which class of fire?
  91. #681 A fire in a transformer terminal would be classified as class __________.
  92. #682 Fires which occur in energized electrical equipment, such as switchboard insulation, are class __________.
  93. #683 A fire in the radio transmitter would be of what class?
  94. #684 A class C fire would be burning __________.
  95. #685 What is the primary hazard, other than fire damage, associated with a class C fire?
  96. #686 Which type of portable fire extinguisher is best suited for putting out a Class D fire?
  97. #687 Which extinguishing agent is best for use on a magnesium fire?
  98. #688 If a powdered aluminum fire is being fought, the correct extinguishing agent would be __________.
  99. #689 An aluminum powder fire is classified as class __________.
  100. #690 A magnesium fire is classified as class __________.

Safety questions: what to expect

Q How many Safety questions are in the Deck pool?

There are 3,245 Safety questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Safety module from the same pool.

Q What score do I need to pass the Safety module?

Most USCG exam modules, including Safety, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Safety exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

Other Deck modules

About the Deck question pool

The Deck pool holds the current U.S. Coast Guard questions for every deck credential, from Able Seaman and the OUPV six-pack up to unlimited Master. Each question is multiple choice with four options, graded instantly, with the USCG reference shown where one exists.