Discussion
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- Question
Pick out the correct statement.
Options- A. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water.
- B. COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time.
- C. COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. The most commonly used chemical coagulant in water treatment is
Options- A. ferrous sulphate
- B. alum
- C. lime
- D. hydrazine Discuss
- 2. Which of the following is the most widely used disinfectant in water treatment?
Options- A. Chlorine
- B. Irradiation of water by ultraviolet light
- C. Cation exchanger
- D. Coagulation Discuss
- 3. 5-200 ?m size particles are called
Options- A. colloids or aerosols
- B. powder
- C. dust
- D. smoke Discuss
- 4. Presence of nitrates in water in excess of 50 ppm causes
Options- A. mathenoglobenemia
- B. gastroentetitis
- C. asphyxiation
- D. tooth decay Discuss
- 5. The upper layer of atmosphere is called the
Options- A. stratosphere
- B. troposphere
- C. ionosphere
- D. none of these Discuss
- 6. Workers working in __________ industry are most prone to white lung cancer.
Options- A. coal mining
- B. limestone mining
- C. textile
- D. asbestos Discuss
- 7. The resistance of water to the passage of light through it is a measure of the
Options- A. turbidity
- B. color
- C. hardness
- D. dissolved gases Discuss
- 8. __________ plant emits large amount of SO2 as an air pollutant.
Options- A. Nitric acid
- B. Sulphuric acid
- C. Chloralkali
- D. Iron & steel Discuss
- 9. Higher concentration of nitrogen dioxide in atmospheric air causes
Options- A. cancer
- B. bronchitis
- C. asphyxiation
- D. corrosion Discuss
- 10. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because
Options- A. of clotting of blood.
- B. of jamming of respiratory tract.
- C. it forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen.
- D. it forms CO2 by combining with oxygen present in the blood. Discuss
Environmental Engineering problems
Search Results
Correct Answer: alum
Correct Answer: Chlorine
Correct Answer: colloids or aerosols
Correct Answer: mathenoglobenemia
Correct Answer: stratosphere
Correct Answer: textile
Correct Answer: turbidity
Correct Answer: Sulphuric acid
Correct Answer: bronchitis
Correct Answer: it forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen.
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