AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Electrostatic precipitator
Smoke stacks of factories are fitted with electrostatic precipitators (along with fabric filters, scrubbers and inertial separators) to reduce particulate matter in air.
Source: Control of Environmental Degradation, Chapter 6
The passage explicitly states: "Particulate matter in the air can be reduced by fitting smoke stacks to factories with electrostatic precipitators, fabric filters, scrubbers and inertial separators." Silencers are for noise reduction, not particulate matter. "Inorganic filter" is not a term used in the chapter. Ash ponds are part of waste management, not smoke stack devices.