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

The energy content of X-rays is usually measured in:

1. Proton
2. Protium
3. Photon
4. None of these

Which of the following is a radioactive pollutant ?

1. Iodine-131
2. Iodine-113
3. Iodine-313
4. Cobalt-16