Electrostatic precipitator is used for the removal of which of the following?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Particulate matter
Option (4) Particulate matter — Correct. An electrostatic precipitator gives dust particles in the exhaust an electric charge; they are then drawn to collecting plates. It removes over 99 per cent of the particulate matter from industrial exhaust.
Note: This question is from Chapter 16, Environmental Issues, of the pre-rationalised NCERT book. This chapter is not in the present NCERT book (2026-27). The extract below is from the pre-rationalised edition.
NCERT Extract (Pre-rationalised edition, Chapter 16, Environmental Issues):
Air Pollution and Its Control – “… There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator (Figure 16.1), which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons.”
