alleryParticulate matter in factory smoke can be cut by fitting stacks with:
AElectrochemical accumulators
BElectromagnetic transmitters
CElectrothermal regenerators
DElectrostatic precipitators
Answer & Solution
Correct answer: D. Electrostatic precipitators
1. Smoke stacks are the point where particles leave the factory.
2. Fitting them with electrostatic precipitators, fabric filters, scrubbers and inertial separators reduces particulate matter.
3. Using oil or gas instead of coal reduces smoke further.
_Source: syllabus Social Science, 'Contemporary India II', Ch 6 'Manufacturing Industries'_
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