Question

Consider statements a-c about pollution.
(a) To control air pollution all Delhi buses were asked to run on unleaded petrol by the end of $2002$.
(b) Electrostatic precipitator can remove $99\%$ of particulate matter from thermal power plant exhaust.
(c) It is possible to estimate amount of organic matter in sewage water by measuring BOD. Of the statements.

• A. b and c correct
• B. a alone correct
• C. b alone correct
• D. c alone correct
• E. a and b correct

Answer 1

The correct option is A b and c correct

• An electrostatic precipitator is a device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates. It can remove 99% of particulate matter from thermal power plant exhaust.
• BOD(Biochemical oxygen demand) is a measure of, the amount of oxygen that require for the bacteria to degrade the organic components present in water/wastewater. Hence based on the BOD it is possible to estimate the amount of organic matter in sewage water.
  
• Hence b and c are correct statements.
• So, the correct answer is 'b and c correct'.