The GATE Grind

GATE 2021 CE (CE1) – Question 23

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

The liquid forms of particulate air pollutants are

  1. dust and mist
  2. mist and spray
  3. smoke and spray
  4. fly ash and fumes

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (B) mist and spray

Explanation

Mist consists of fine suspended liquid droplets formed by condensation; spray consists of liquid droplets produced by mechanical atomisation. Dust, smoke, fly ash and fumes are predominantly solid particulates. Thus the liquid pair is **mist and spray (B)**.