NEET

Today the concentration of green house gases is very high because of

use of refrigerator
increased combustion of oils and coal
deforestation
All of the above

Carbon monoxide (CO) is harmful to man because

it forms carbolic acid
it generates excess CO₂
it is carcinogenic
it competes with O₂ for haemoglobin

Solution

CO is highly toxic and impairs respiration. CO combine with haemoglobin of blood and reduces its O₂ carry capacity.

Which of the following is/are the hazardous pollutant(s)present in automobile exhaust gases?
(i)N₂
(ii)CO
(iii)CH₄
(iv)Oxides of nitrogen

(ii) and (iii)
(i) and (ii)
(ii) and (iv)
(i) and (iii)

Solution

CO and oxides of Nitrogen are poisnous gases present in automobile exhaust gases.

Green house gases –

allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wavelength to leave the earth's atmosphere.
allow longer wavelength to enter earth atmosphere while doesn't allow shorter wavelength to leave the surface
don't have wavelength specific character.
show wavelength specific behaviour near the earth while far from earth these have wavelength independent behaviour.

Solution

Radiation coming from sun or outer space have high energy or short wavelength, which are allowed to enter by greenhouse gases. However, radiation emitted by earth is in infrared region, having long wavelength,are reflected back by the envelope of green house gases.

Formation of London smog takes place in

winter during day time
summer during day time
summer during morning time
winter during morning time

Solution

London smog is formed in morning during winter.

The substance which is a primary pollutant?

H₂SO₄
CO
PAN
Aldehydes

Solution

CO is primary pollutant.

The region which is greatly affected by air pollution is

Thermosphere
Stratosphere
Troposphere
Mesosphere

Solution

Air pollution greatly affect the troposphere.

Acid rain is due to

CH₃
N₂O₅
SO₂ and NO₂
C₂H₅OH

Solution

Acid rain is rain or any other form of precipitation that is unusually acidic.It has harmful effects on plants,aquatic animals, and infastructure. Acid rain is mostly caused by human emissions of sulfur and nitrogen compounds which react in the atmosphere to produce acids. In recent years, many governments have introduced laws to reduce these emissions.

Which of the following is the coldest region of atmosphere

Thermosphere
Mesosphere
Troposphere
Stratosphere

Solution

The coldest region is mesosphere (temp. –27ºC to– 92ºC).

The uppermost region of the atmosphere is called

Ionosphere
Stratosphere
Troposphere
Exosphere

Solution

The uppermost region of atmosphere is exosphere.

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