1) The degree of ozone layer is measured by ......................... a) Dobson b) picometre 2) Ozone layer spread forming a layer of thickness .................... km a) 23 b) 25 c) 20 d) 200 3) Near Ultraviolet radiation can penetrate Ozone layer 100 % a) true b) false 4) The English scientist Dobson postulated the thickness of ozone layer can be compressed into only ................atmospheric pressure a) 33mm b) 3m c) 3mm d) 3 picometer 5) ............................. and ................................... are harmful ultraviolet rays for living organisms a) Near and medium b) Near and far  c) Far and medium 6) Ozone gas is formed of ..................... a) 3 oxygen atoms b) 2 oxygen atoms c) hydrogen and oxygen

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