3-20.  Safety-minded  supervisors  are considered  the  key  to  successful mishap prevention programs for which of  the  following  reasons? 1.  They  have  routine  contact  with personnel  and  equipment 2. They know the work areas and hazards involved 3.  They  can  take  immediate  action 4.  Each  of  the  above 3-21.  What  is  the  most  common  cause  of mishaps  in  the  Navy? 1. Apathy 2. Skylarking 3. Lack of knowledge or skill 4.  Long  working  hours 3-22. Which of the following methods will you  find  to  be  the  most  effective  when teaching  safety  habits? 1.  Discussions 2.  Training  films 3.  Hands-on  practice 4.  Classroom  lectures 3-23.  Which  of  the  following  publications contains  pages  that  make  good  safety posters? 1. Fathom 2.  All  Hands 3.  Navy  Times 4. Navy Customer Service Manual 3-24.  Which  of  the  following  points  should be  considered  by  personnel  who  conduct safety  inspections? 1. They should keep an open mind at all  times 2. They should know what to look for 3.  They  should  use  a  checklist  during inspections 4.  All  of  the  above 3-25.  First-line  supervisors  should  hold random  informal  inspections  for hazards  at  least  how  often? 1.  Daily 2.  Weekly 3.  Monthly 4.  Quarterly 3-26. Which of the following personnel should  always  be  present  during  a safety  inspection? 1.  The  division  officer 2. The department head 3. The personnel who work in the space 4. The master at arms 3-27.  The  basic  guidance  for  Navy Occupational  Safety  and  Health (NAVOSH)  is  contained  in  which  of  the following  publications? 1. OPNAVINST P-5100 2. OPNAVINST 5100.23B 3. OPNAVINST 5100.19A 4. OPNAVINST 5102.1A 3-28.  To  accomplish  the  objectives  of  the Navy  Hearing  Conservation  Program, which  of  the  following  actions  should you take? 1.  Survey  work  spaces 2.  Require  periodic  hearing  tests 3.  Educate  personnel  in  causes  of hearing  loss 4.  All  of  the  above 3-29. Which of the following is the most common  work-related  source  of  noise? 1.  Gun  or  rocket  firings 2.  Marine  engines 3.  Aircraft  launches 4.  High-speed  tools 3-30.  Navy  personnel  should  be  encouraged to  wear  hearing  protective  devices while  mowing 1.  True 2.  False 3-31.  Equipment  or as  hazardous which  of  the 1. 80 dB 2.  110  dB 3. 150 dB their lawns at home. spaces  should  be  labeled if  noise  is  produced  at following  sound  levels? 4. Both 2 and 3 above 16