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  • Question
  • Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?


  • Options
  • A. NOx
  • B. Hg
  • C. SO2
  • D. F

  • Correct Answer
  • SO2 


  • Environmental Engineering problems


    Search Results


    • 1. Pick out the wrong statement.

    • Options
    • A. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone.
    • B. Mesosphere is characterised by very low atmospheric pressure and low temperature.
    • C. Troposhere is a dusty zone containing water vapor and clouds.
    • D. The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.
    • Discuss
    • 2. Persons working in cement plants and limestone quarries are more prone to disease like

    • Options
    • A. cancer
    • B. asthma
    • C. silicosis
    • D. flourosis (bone disease)
    • Discuss
    • 3. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

    • Options
    • A. inversely proportional to viscosity of gas.
    • B. proportional to the viscosity & density of the gas.
    • C. proportional to the pressure of the gas.
    • D. both (b) and (c).
    • Discuss
    • 4. Which is a secondary air pollutant?

    • Options
    • A. Photochemical smog
    • B. Sulphur dioxide
    • C. Nitrogen dioxide
    • D. Dust particles
    • Discuss
    • 5. Which of the following is the most detrimental for water used in high pressure boiler?

    • Options
    • A. Silica
    • B. Turbidity
    • C. Phenol
    • D. Dissolved oxygen
    • Discuss
    • 6. In water chemical treatment plant, use of chloramines ensures

    • Options
    • A. disinfection.
    • B. taste & odour control.
    • C. weed control in reservoirs.
    • D. removal of permanent hardness.
    • Discuss
    • 7. 80% less than 200 mesh size particles are called

    • Options
    • A. smoke
    • B. powder
    • C. grit
    • D. aggregates
    • Discuss
    • 8. Tri-sodium phosphate is used in boiler water treatment to reduce

    • Options
    • A. turbidity
    • B. caustic embrittlement
    • C. suspended silica
    • D. dissolved oxygen
    • Discuss
    • 9. Iron & manganese present as pollutant in water can not be removed by

    • Options
    • A. ion exchange process.
    • B. oxidation followed by settling & filtration.
    • C. lime soda process or manganese zeolite process.
    • D. chlorination.
    • Discuss
    • 10. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.

    • Options
    • A. coal
    • B. uranium ore
    • C. iron ore
    • D. lime
    • Discuss


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