dB is a standard abbreviation used for the quantitative expression of
the density of bacteria in a medium
a particular pollutant
the dominant Bacillus in a culture
the dominant Bacillus in a culture
B.
a particular pollutant
Noise pollution is a physical form of pollution that affects the receiver directly. dB (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of 80 dB and above, it harms hearing system. The WHO has fixed 45 dB as the safe noise level for city
Which one of the following is not used in organic farming?
Glomus
Earthworm
Oscillatoria
Oscillatoria
A renewable exhaustible natural resource is
coal
petroleum
minerals
minerals
The two gases making highest relative contribution to the green house gases are
CO2 and CH4
CH4 and NO2
CFCs and N2O
CFCs and N2O
Which two of the following changes (1-4) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?
1) Increase in red blood cell size
2) Increase in red blood cell production
3) Increase in breathing rate
4) Increase in thrombocytes count
Changes occurring are
(2) and (3)
(3) and (4)
(1) and (4)
(1) and (4)
