railway RRB JE (CBT I + CBT II) Mock Test 2024 People Development & Environment Environmental Issues Pollution
Coronavirus trasmits from person to person by aerosols. Aerosols are defined as
1
colloidal suspension of solid particles in gaseous media
2
colloidal suspension of liquid particles in gaseous media
3
colloidal suspension of microorganisms in gaseous media
4
colloidal suspension of solid and liquid particles in gaseous media