oxygen

#10. The colour of American and European oxygen cylinders is:

• Ared
• Bblue
• Cgreen
• Dbrown

#1. Without added oxygen the time of useful consciousness at 30000 ft is approximately:

• Atwenty seconds
• Beighty seconds
• Cone to two minutes
• Dsix minutes

#2. Without added oxygen the time of useful consciousness at 40000 ft is approximately:

• Atwenty seconds
• Bthree minutes
• Ceighty seconds
• Dsix minutes