According to central pollution control Board (CPCB), which particulate size in diameter (n micrometres) of the air pollutants is responsible for greatest harm to human health?
2.5 or less
1.5 or less
1.0 or less
1.0 or less
A.
2.5 or less
Particles in the size range 1-10 μm have measurable settling velocities but are readily stirred by air movements whereas particles of size 0.1-1 μm, a submicroscopic size found in Urban air, undergo random Brownian motion reulting from collisions among individual molecules. Of all the different types of particulates in the atmosphere, the presence of trace elements such as cadmium, lead nickel and mercury may constitute the greatest health hazard.
About 70% of total global carbon is found in
grasslands
agro -ecosystem
Oceans
Oceans
World summit on sustainable development (2002) was held in
Brazil
Sweden
Argentina
Argentina
Which one of the flowing is the correct percentage of the two (out of the total of 4 ) green-house gases that contribute to the total global warming?
CFC 14%, CH4 20%
CO2 40% CFCs 30%
N2O 6%, CO2 86%
N2O 6%, CO2 86%
Modern detergents contain enzyme preparations of
acidophiles
alkaliphiles
thermoacidophiles
thermoacidophiles
