Checking of re-radiating heat by atmospheric CO₂ methane, ozone, dust is known as 

1. green house effect

2. radioactive effect

3. ozone layer

4. solar effect.

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)

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)

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

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

Montreal protocol aims at
1. reduction of ozone depleting substances
2. biodiversity conservation
3. control of water pollution
4. control of CO₂ emission

Chipko movement was launched for the protection of

1. grasslands

2. forests

3. liverstock

4. wet lands

dB is a standard abbreviation used for the quantitative expression of

1. the density of bacteria in a medium

2. a particular pollutant

3. the dominant Bacillus in a culture

4. a certain pesticide