One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as 
(1) N₂O and CO₂

(2) CFCs and N₂O

(3) methane and CO₂

(4) methane and CFCs

Which one option is incorrectly matched regarding biological magnification of DDT in aquatic ecosystem.
(1) Small fish                        0.5 ppm 

(2) Large fish                        2 ppm

(3) Fish eating birds               25ppm

(4) Zoopkankton                   0.003 ppm

Which one is matched correctly?
(1) Arsenic-Black foot disease

(2) Fluoride--Itai-itai

(3) Mercury-Skeletal fluorosis

(4) Cadmium-Minamata disease

The government of India in 1980s has introduced a concept to work closely with the local communities for protecting and managing forests. The concept is 
(1) Forest Research Institutes

(2) Panel of focal communities for forest management 

(3) Joint forest Management

(4) Jhum Cultivation

The thickness of the ozone is measured in terms of:-
(1) P

(2) DU

(3) µ

(4) RA

Match teh following and select the correct option.

(1) A - (iii), B - (ii), C - (iv), D - (i)

(2) A - (ii), B - (iii), C - (iv), D - (i)

(3) A - (i), B - (iii), C - (ii), D - (iv)

(4) A - (iv), B - (ii), C - (iii), D - (i)

Which of the following is a secondary pollutant?

(1) Carbon dioxide

(2) Nitrogen oxides

(3) Peroxyacyl nitrates

(4) All of these

A large quantity of urban sewage is drained to nearby village river. Which among the given conditions would happen after mixing of sewage into the river?

(i) Biochemical oxygen demand (BOD) of receiving water body increases.
(ii) Dissolved oxygen of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures
(iv) It will lead to nutrient enrichment of receiving water body.

(1) (i), (ii) and (iii)

(2) (i), (ii) and (iv)

(3) (ii) and (iii)

(4) (iii) and (iv)

Select the correct statement.

(1) Particulate matter of size 10 μm can create severe damage to the lungs.

(2) Particulate matter of size greater than 2.5 $\mathrm{\mu }$m can get trapped in lungs and cause problems.

(3) Particulate matter of size less than 2.5 μm penetrate deep into lungs.

(4) None of the above.

Cattle ranches are known to causes acute green house effect. This is due to
(1) mechanized milking practices

(2) methanogenic bacteria in rumen

(3) decomposition of left over fodder

(4) decomposition of organic remains in faeces.