Environmental Engineering problems
- 1. A shallow pond in which the sewage is retained and biologically treated is called
Options- A. oxidation
- B. Imhoff tank
- C. lagoon
- D. skimming tank Discuss
Correct Answer: oxidation
- 2. Which of the following is the most severe air pollutant?
Options- A. hydrocarbons
- B. NOx
- C. SO2
- D. CO Discuss
Correct Answer: NOx
- 3. Which is the most practical and economical method for removal of suspended solid matter from polluted water?
Options- A. Sedimentation
- B. Skimming off
- C. Chlorination
- D. Biological oxidation Discuss
Correct Answer: Sedimentation
- 4. Which of the following pollutants, if present in atmosphere is detectable by its odour?
Options- A. CO
- B. SO2
- C. NO2
- D. CO2 Discuss
Correct Answer: SO2
- 5. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
Options- A. decreases.
- B. increases.
- C. remains constant.
- D. may increase or decrease ; depends on the chemical characteristics of polluted water. Discuss
Correct Answer: decreases.
- 6. Which of the following radioactive wastes emits all ?, ? & ? rays and hence is the most hazardous of all radioactive emitters?
Options- A. I-131
- B. Sr-90
- C. Au-198
- D. Ra-226 Discuss
Correct Answer: Ra-226
- 7. Maximum permissible turbidity in potable water is __________ ppm.
Options- A. 1
- B. 10
- C. 250
- D. 1000 Discuss
Correct Answer: 10
- 8. Which of the following is not a secondary air pollutant?
Options- A. Ozone
- B. Photochemical smog
- C. Sulphur dioxide
- D. All (a), (b) & (c) Discuss
Correct Answer: Sulphur dioxide
- 9. Pick out the wrong statement.
Options- A. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value.
- B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines.
- C. Temperature in stratosphere rises with increasing altitude.
- D. The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere. Discuss
Correct Answer: The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere.
- 10. __________ can not control the noise pollution.
Options- A. Use of silencers
- B. Green house gases
- C. Vibration damping
- D. Tree plantation Discuss
Correct Answer: Green house gases
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