Consider the following statements with respect to pollution.
A. To control air pollution problems, by the end of 2002 all the buses of Delhi were converted to run on unrelated petrol
B. Electrostatic precipitator can remove over 99% particulated matter present in the exhaust from a thermal power plant.
C. It is possible to estimate the amount of organic matterin sewage water by measuring BOD.
Of the above statements:

Options

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

Answer

To analyze the given statements regarding pollution, we will evaluate each statement one by one and determine their correctness.

### Step 1: Evaluate Statement A
**Statement A:** "To control air pollution problems, by the end of 2002 all the buses of Delhi were converted to run on unrelated petrol."

- **Analysis:** The statement mentions that all buses were converted to run on "unrelated petrol." However, the Delhi government actually converted its buses to run on Compressed Natural Gas (CNG) to reduce pollution, not "unrelated petrol." Thus, this statement is incorrect.

### Step 2: Evaluate Statement B
**Statement B:** "Electrostatic precipitator can remove over 99% particulate matter present in the exhaust from a thermal power plant."

- **Analysis:** An electrostatic precipitator is indeed a device that removes suspended particulate matter from exhaust gases by applying a high voltage electrostatic charge. It can effectively remove more than 99% of particulate matter from the exhaust of thermal power plants. Therefore, this statement is correct.

### Step 3: Evaluate Statement C
**Statement C:** "It is possible to estimate the amount of organic matter in sewage water by measuring BOD."

- **Analysis:** BOD, or Biological Oxygen Demand, measures the amount of oxygen required by bacteria to decompose organic matter in water. A higher BOD indicates a higher amount of organic matter present. Thus, this statement is also correct.

### Conclusion
After evaluating all three statements:
- Statement A is incorrect.
- Statement B is correct.
- Statement C is correct.

Therefore, the correct answer is that statements B and C are correct.

### Final Answer:
The correct statements are B and C.

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