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- Question
Tri-sodium phosphate is used in boiler water treatment to reduce
Options- A. turbidity
- B. caustic embrittlement
- C. suspended silica
- D. dissolved oxygen
- Correct Answer
- caustic embrittlement
- 1. 80% less than 200 mesh size particles are called
Options- A. smoke
- B. powder
- C. grit
- D. aggregates Discuss
- 2. 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
- 3. 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 Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
Options- A. coal
- B. uranium ore
- C. iron ore
- D. lime Discuss
- 8. The commonest form of iron & manganese found in ground water as pollutant is in the form of their
Options- A. carbonates
- B. bi-carbonates
- C. chlorides
- D. sulphides Discuss
- 9. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
Options- A. 120
- B. 140
- C. 170
- D. 200 Discuss
- 10. TLV of mercury in potable (drinking) water is about __________ ppm.
Options- A. 0.001
- B. 0.1
- C. 1
- D. 5 Discuss
Environmental Engineering problems
Search Results
Correct Answer: powder
Correct Answer: disinfection.
Correct Answer: SO2
Correct Answer: The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.
Correct Answer: silicosis
Correct Answer: chlorination.
Correct Answer: coal
Correct Answer: bi-carbonates
Correct Answer: 170
Correct Answer: 0.001
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