Answer: an electrostatic precipitator.
- A a gas chromatograph column
- B an electrostatic precipitator
- C a simple cloth filter
- D a domestic water purifier
Correct answer: B. an electrostatic precipitator
Explanation: An electrostatic precipitator charges dust particles and collects them on oppositely charged plates, removing over 99 percent of the particulate matter from flue gases.
Sunlight passes through the atmosphere and warms the surface; the surface re-radiates this energy as infrared heat, which greenhouse gases (CO₂, CH₄, water vapour) absorb and trap - a naturally beneficial process that intensifies into global warming as gas concentrations rise from human activity.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.