Chemical Environmental Engineering Objective Questions & Answers - ObjectiveBooks
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Chemical Environmental Engineering Objective Questions & Answers

Practice Test: Question Set - 20


1. Tolerable limit of nitrogen oxides in air is __________ ppm.
    (A) 0.1
    (B) 1
    (C) 5
    (D) 25

2. Noise level heard at a distance of about 100 meters from a jet engine with after burner is about __________ decibels.
    (A) 120
    (B) 140
    (C) 170
    (D) 200

3. Presence of __________ in water stream are deleterious to aquatic life.
    (A) Soluble and toxic organics
    (B) Suspended solids
    (C) Heavy metals and cyanides
    (D) All (a), (b) & (c)

4. Scale formation in boiler is controlled by
    (A) Preheating of feed water
    (B) Reduction in hardness, silica & alumina in feed water
    (C) Keeping the pH value of feed water just below 7
    (D) Eliminating H2S in feed water

5. Noise emitted by a ventilation fan at a distance of 3 meters is about __________ decibels.
    (A) 85
    (B) 105
    (C) 125
    (D) 145

6. Main pollutant present in automobile exhaust is
    (A) CO
    (B) CO2
    (C) NO
    (D) Hydrocarbons

7. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
    (A) Biological oxygen pond
    (B) Aerated lagoons
    (C) Trickling filters
    (D) Gravity separator having oil skimming devices

8. Pollution by particulate matter emission in the atmosphere does not take place during metal
    (A) Grinding
    (B) Machining
    (C) Cutting
    (D) Polishing

9. Dose of chlorine for disinfection of water is about __________ mg/liter of water.
    (A) 0.01
    (B) 0.1
    (C) 0.3
    (D) 1

10. The commonest form of iron & manganese found in ground water as pollutant is in the form of their
    (A) Carbonates
    (B) Bi-carbonates
    (C) Chlorides
    (D) Sulphides

11. Solid content in most of the domestic sewage is about __________ percent.
    (A) 0.001
    (B) 0.1
    (C) 5
    (D) 10

12. Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
    (A) 1-2
    (B) 5-10
    (C) 15-20
    (D) 25-30

13. Which of the following pollutants is not emitted during volcanic eruptions?
    (A) SO2
    (B) H2S
    (C) CO
    (D) Hydrocarbons

14. Which is a secondary air pollutant?
    (A) Photochemical smog
    (B) Sulphur dioxide
    (C) Nitrogen dioxide
    (D) Dust particles

15. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
    (A) 5
    (B) 500
    (C) 1000
    (D) 2000

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