23. In deep-sea diving, divers use a mixture of gases consisting of oxygen and A.Hydrogen B.Nitrogen C.Argon D.Helium
Answer: Option B Solution: Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as ‘Enriched Air.’
