Q. Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ?

View solution

Q. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

View solution

Q. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

View solution

Q. Insufficient washing of sand grains in a rapid sand filter causes

View solution

Q. Which of the following sources is responsible for maximum air pollution ?

View solution

Q. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

View solution

Q. In sewage treatment, its sedimentation is speeded up by commonly adding

View solution

Q. Noise level in a quiet private business office is about __________ decibels.

View solution

Q. White smoke coming out of the chimney of a furnace indicates the use of

View solution

Q. TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

View solution

Q. Sulphur dioxide present in the industrial chimney exhaust gases causes

View solution

Q. A man exposed to excessive noise level in the working environment may suffer from

View solution

Q. Which of the following is a secondary air pollutant ?

View solution

Q. Presence of __________ bacteria in water causes disease like typhoid.

View solution

Q. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

View solution

Q. Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

View solution

Q. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

View solution

Q. Fresh domestic sewage is __________ in color.

View solution

Q. Out of the following, TLV of __________ is maximum (about 500 ppm).

View solution

Q. Which of the following plants does not emit appreciable amount of SO₂ in atmosphere ?

View solution