Environmental Engineering Applications Online Test - Set 07 - ObjectiveBooks
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Environmental Engineering Applications Online Test - Set 07

Practice Test: Question Set - 07


1. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
    (A) Ionosphere
    (B) Troposphere
    (C) Stratosphere
    (D) None of these

2. Pick out the wrong statement.
    (A) A slight haze at the top of chimney indicates good combustion in the furnace
    (B) A bag filter incurs very small pressure drop and is very efficient for removal of submicronic dust particles from flue gases at very high temperature
    (C) Electrostatic precipitator is the most efficient dust collection equipment for removal of submicronic dust particles present in flue gas
    (D) None of these

3. The progressive warming up of the earth's surface is mainly due to the
    (A) Automobile exhaust
    (B) Blanketing effect of CO2 in the atmosphere
    (C) De-forestation
    (D) Thickening of ozone layer

4. The function of skimming tank in sewage treatment is to remove __________ substances.
    (A) Dissolved solid
    (B) Suspended solid
    (C) Oil & fatty
    (D) Gritty & inorganic

5. Hydrogen ion concentration in distilled water is
    (A) 10-7
    (B) 7 × 10-7
    (C) 107
    (D) 7 × 107

6. A standard test for determination of hardness in water is termed as __________ test.
    (A) EDTA
    (B) Electometric
    (C) Total count
    (D) Presumptive

7. Infective bacteria in water is killed by the __________ process.
    (A) Sterilisation
    (B) Aeration
    (C) Disinfection
    (D) None of these

8. Removal of __________ results from the disinfection of water.
    (A) Turbidity
    (B) Odour
    (C) Hardness
    (D) Bacteria

9. Ozone is
    (A) A primary pollutant
    (B) A secondary pollutant
    (C) Impervious to ultra-violet rays
    (D) Both (b) and (c)

10. Which of the following is not a natural source of air pollution?
    (A) Volcanic eruptions and lightening discharges
    (B) Biological decay of vegetable matter
    (C) Photochemical oxidation of organic matter
    (D) None of these

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

12. Which of the following is the most widely used disinfectant in water treatment?
    (A) Chlorine
    (B) Irradiation of water by ultraviolet light
    (C) Cation exchanger
    (D) Coagulation

13. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
    (A) Foaming
    (B) Odour nuisances
    (C) Undesirable plant growth
    (D) Turbidity

14. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
    (A) 0.05
    (B) 1
    (C) 6.5
    (D) 15

15. TLV of lead for public sewer/waste water is about __________ ppm.
    (A) 1
    (B) 25
    (C) 150
    (D) 650

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