Which of the following gas can cause acid rain ?

1. Sulphur dioxide
2. Ammonia
3. Hydrogen
4. Nitrogen

Which of the following is responsible for causing the ozone hole ?

1. Methane
2. Carbon dioxide
3. Aerosols
4. Sulphur dioxide

One of the best solutions to get rid of non-biodegradable wastes is :

1. Dumping
2. Incinerating
3. Recycling
4. Composting

An undesirable change in the environment is called as :

1. Pollutant
2. Population
3. Pollution
4. None of these