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)

Isn't this a great sign? You may not ever see this warning symbol, but if you do it would be

in your best interest to know what it means.

• (a)ionizing radiation

• (b) get out while you still can, it's

  radioactive here

• (c) dangerous high-powered ventilation

• (d) toxic vapors

• (e) potentially lethal levels of radiation

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

don't store your lunch in a refrigerator which displays this sign. It signifies:

• (a) biohazard

• (b) radiation hazard

• (c) radioactive biological hazard

• (d) nothing necessarily dangerous, just

  the presence of biological samples

It looks like a pretty snowflake, but that

yellow background is cautionary. What

type of hazard does this symbol

indicate?

• (a) dangerous when frozen

• (b) icy conditions

• (c) low temperature or cryogenic hazard

• (d) cold storage required (freezing point

  of water or below)

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. a general warning sign to

  be used to indicate a no-no or 'I know

  what you're thinking, don't do it.

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

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

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

Unless you have been living in a hole for the past 50 years, you have seen this symbol.

Actually, if you were in a hole the past 50 years, the hazard indicated by this symbol might

have had something to do with it. This sign indicates:

• (a) unguarded fan blades

• (b) radioactivity

• (c) biohazard

• (d) toxic chemicals

• (e) it isn't a real sign