Pollution:
1. Any undesirable change in physical characteristics of air, land water and soil
2. Any undesirable change in biological characteristics of air, land water and soil
3. Any undesirable change in physical, chemical and biological characteristics of air, land water and soil
4. Any undesirable change in physical and chemical characteristics of air, land water and soil

Agents that bring undesirable change in biological, physical and chemical environment is called

The act to control environmental pollution is passed by Government of India is

Environment Protection Act protects and improves the quality of

According to CPCB, what particulate size is most harmful to humans:
1. more than 10 micrometers
2. between 5 to 10 micrometers
3. between 2.5 to 5 micrometers
4. less than 2.5 micrometers

The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator
2. cyclonic separator
3. trajectory separator
4. scrubber

A scrubber in the exhaust of a chemical industrial plant removes

1. Gases like sulphur dioxide

2. Particulate matter of the size 5 micrometer or above

3. Gases like ozone and methane

4. Particulate matter of the size 2.5 micrometer or less

Identify 1., 2., 3. and 4. in the diagram

Which is incorrect about electrostatic precipitator (ESP)?

1. Corona produces electrons
2. Collecting plates are grounded, so use to attract the charged dust particle
3. Velocity of air between the plates must be low
4. Electrode wires that are maintained at several thousand volts produces corona

Harmful effects of Air pollutants depend upon