Environmental Engineering Question Paper MCQ - Set 19 - ObjectiveBooks

Environmental Engineering Question Paper MCQ - Set 19

Practice Test: Question Set - 19

1. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
    (A) 50
    (B) 1000
    (C) 2000
    (D) 5000

2. Higher concentration of CO2 in atmosphere
    (A) Allows visible solar radiation (ultraviolet) of short wave-length to pass through
    (B) Reflects and absorbs the longer wavelength (infra-red) radiations
    (C) Prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming
    (D) All (a), (b) and (c)

3. Dissolved oxygen content in river water is around __________ ppm.
    (A) 5
    (B) 100
    (C) 250
    (D) 500

4. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
    (A) Blood poisoning
    (B) Anaemia
    (C) Nervous system disorder
    (D) All (a), (b) & (c)

5. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
    (A) Photochemical smog
    (B) Peroxyacetyl nitrate (PAN) or methyl nitrite
    (C) Benzopyrene
    (D) Polyacrylonitrile

6. Maximum permissible turbidity in potable water is __________ ppm.
    (A) 1
    (B) 10
    (C) 250
    (D) 1000

7. Presence of excess fluorine in water causes
    (A) Dental cavity
    (B) Tooth decay
    (C) Fluorosis
    (D) Respiratory disease

8. TLV of aldrin in public water supply system is about __________ μg/liter.
    (A) 0.5
    (B) 17
    (C) 357
    (D) 1097

9. H2S present in gaseous stream can be removed by adsorption on
    (A) Silica gel
    (B) Active carbon
    (C) Bog iron
    (D) Limestone powder

10. Aerobic biological oxidation ponds used for the purification of polluted water
    (A) Destroys/removes pathogen from the sewage
    (B) Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
    (C) Destroys/removes pathogen much more effectively if the sewage is chlorinated
    (D) All (a), (b) & (c)

11. Radioactive substances present in the polluted water stream can be removed by
    (A) Biological oxygen treatment
    (B) Coagulation and filtration
    (C) Adsorption in ion exchange materials
    (D) None of these

12. Iron & manganese present in the polluted water is removed by
    (A) Simple filtration
    (B) Oxidation followed by settling & filtration
    (C) Chemical coagulation
    (D) Chlorination only

13. TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.
    (A) 0.1
    (B) 25
    (C) 100
    (D) 1000

14. BOD of raw municipal sewage may be in the range of about __________ mg/liter.
    (A) 1-2
    (B) 5-10
    (C) 150-300
    (D) 2000-3000

15. Presence of bacteria in potable (drinking) water causes
    (A) Turbidity
    (B) Disease
    (C) Bad odour
    (D) Bad taste & color

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