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

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

What is the intensity of sound in normal conversation:
1.  10 – 20 decibels
2.  30 – 60 decibels
3.  70 – 90 decibels
4.  120 – 150 decibels

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%