state gov APPSC (ఆంధ్రప్రదేశ్) Group 2 (Pre + Mains) Mock Test 2023 General Knowledge Geography (World Geography) Climatology
The thickness of the Ozone in a column of air from the ground to the top of the atmosphere is measured in terms of:
1
Dobson unit
2
Decible unit
3
Dolby unit
4
Mach unit