9. (a) In case of fire, do not enter. (b) This sign indicates the location of the fire fighting equipment. (c) This sign indicates the location of the emergency exit. (d) This sign indicates the path is safe if there is a fire.

10. This symbol means: (a) you shouldn't drink the water (b) you shouldn't use the faucet (c) you shouldn't bring in drinks (d) don't clean your glassware here

11. (a) unguarded fan blades (b) radioactivity (c) biohazard (d) toxic chemicals (e) it isn't a real sign

12. (A) Here is the church. (B) The fire station is here. (C) The first aid station is here. (D) This is a safe location for eating and drinking. (E) Oxygen is kept here.

13. This symbol is often confused with a similar-looking symbol. What does it mean? (a) flammable, keep away from heat or flame (b) oxidizer (c) heat-sensitive explosive (d) fire/flame hazard (e) no open flames

14. There might be a few reasonable interpretations for this sign, but only one is correct. What does this symbol indicate? (a) breakfast bar, serving bacon and pancakes (b) noxious vapors (c) hot surface (d) high vapor pressure

15. It's just a big X. What does that mean? (a) don't store chemicals here (b) potentially harmful chemical, usually an irritant (c) do not enter (d) just don't. general warning sign to be used to indicate a no-no or 'I know what you're thinking, don't do it.

16. (a) A full-body shower is required before you may enter this area. (b) In the event of an emergency, please stand under this light. (c) This is the location of a water safety shower. (d) This is the location of emergency overhead lighting

17. (a) biohazard (b) radiation hazard (c) radioactive biological hazard (d) nothing necessarily dangerous, just the presence of biological samples

18. This symbol commonly is found in chemistry labs and on trucks carrying hazardous materials. What does it mean? (a) acid, touching it will lead to what you see in the picture (b) harmful to living tissue, touching it is a bad plan (c) dangerous liquid, don't touch (d) cut or burn hazard, both living and non-living material (e) corrosive, no touchy-touchy

19. (a) If there is an evacuation or an emergency, this is where you go. (b) In the event of an emergency, blame these guys. (c) In the event of an emergency, please leave this area. (d) This sign indicates where to go to find help

20. The skull and crossbones is a classic warning sign, but can you name the type of danger? (a) general danger from chemicals (b) flammable materials (c) toxic or poisonous materials (d) dangerous to eat/drink, but otherwise safe (e) this symbol isn't officially used (pirate ships don't count)