Best economic method to harvest solar energy:
1.  Solar cell
2.  Energy plantation
3.  Cultivation of sugar cane then energy obtain by burning it
4.  Solar cooker

In 1984, the Bhopal gas tragedy took place because methyl isocyanate:

1. Reacted with ammonia

2. Reacted with CO₂

3. Reacted with water

4. Reacted with DDT

Bhopal gas tragedy is related to:
1.  Methane
2.  Carbon monoxide
3.  Methyl Isocyanate (MIC)
4.  $S{O}_2$

Concentration of DDT is highest in:
1.  Primary consumer
2.  Producers
3.  Top consumer
4.  Decomposers

Recently Govt. of India has allowed the mixing of alcohol in petrol. What is the amount of alcohol permitted for mixing in petrol:

1. 10–15%

2. 10%

3. 5%

4. 2.5%

Which of the following is a secondary pollutant:
1. PAN
2. CO
3. $N{O}_2$
4. $S{O}_2$

Large-scale death of fish occurs in:
1.  Saline lake
2.  Oligotrophic lake
3.  Eutrophic lake
4.  Shallow lake

The main reason for water bloom in rivers, lakes, sea, etc. is:
1.  Brown algae and green algae
2.  Cyanobacteria and dinoflagellates
3.  Eicchornia
4.  Fishes

Maximum DDT is present in birds feeding on:
1.  Fishes
2.  Meat
3.  Insects
4.  Seeds

Green house effect is:
1.  Gardening outside the house
2.  Global cooling
3.  Global warming
4.  Green colour house