Environmental E...

The catalyst used for the catalytic combination and removal of carbon monoxide and sulphur dioxide gases is

According to Noise pollution (Regulation and control) Rules 2000 of India, the day time noise limit for a commercial area expressed in dB(A) L_eq is __________. 

50 dB sound was recorded with a noise meter located at 100 m from a point sources. If the next sound recorded was 55 dB then, the distance between noise meter and new point source is

A wet air parcel having temperature of 60°C ascending vertically upwards travels a distance of 900 m following adiabatic lapse rate. The temperature of the air parcel at 900 m is

The L_eq value for fluctuating sound level of 60 dB for 30 minutes followed by 90 dB for 15 minutes and then again 75 dB for 30 minutes is (in dB up to 2 decimal places) _____

The concentration of nitrogen dioxide (NO₂) in an ambient atmosphere is found to 30 ppb (parts per billion). Under the same condition the above concentration of nitrogen dioxide (NO₂) measured in μg/m³ is ________

Given: P/RT = 41.6 mol/m³, where P = Pressure, T = Temperature, R = Universal gas constant and Molecular weight of NO₂ is 46 g/mol.

A landfill is to be designed for a small town with 3000 houses. The town generates 500 grams of solid waste per person per day. 15% of the waste generated goes to the recycling unit, and the density of uncompacted solid waste is 180 kg/m³. The solid waste is compacted to 60% of the initial volume and 5% of the compacted volume is occupied by the cover of landfill. If in each household average 4 people are considered, then the volume of the landfill to be considered for 20 years design is ______× 10³. (Round off to nearest integer)