Environmental engineering GATE MCQ

Environmental Engg Mcqs

Quiz

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1. Wilson’s disease is caused by
   1.   Lead
   2.   copper
   3.   iron
   4.   Manganese
2. The uniformity coefficient of slow sand filter is generally
   1.   3
   2.   1.6
   3.   1.65
   4.   1.75
3. Blue baby disease (methamoglobinemia) in children is caused by the presence of
   excess of ?
   1.   Fluoride
   2.   Lead
   3.   Chloride
   4.   Nitrates
4. A 2.5% solution of a sewage sample is kept at an incubation temperature of 20°C. If
   initial DO and final DO values after 5 days of incubation period are 9.36 mg/l and 6.20mg/l respectively, then the BOD will be?
   1.   a. 114.8 mg/l
   2.   119.3 mg/l
   3.   126.4 mg/l
   4.   128.7 mg/l
5. ________ G value with ________ time tend to produce small, dense flocs.?
   1.   a. Large, long
   2.   Low, long
   3.   Large, short
   4.   Low, short
6. Free ammonia indicates?
   1.   a. Quantity of nitrogen present in sewage before the decomposition of organic matter is
      started.
   2.   Presence of partly decomposed organic matter.
   3.   Presence of fully oxidized organic matter.
   4.   Very first stage of decomposition of organic matter.
7. What are the air pollutants responsible for acid rain in downwind areas for major
   industrial emission?
   1.   Methane and hydrogen sulphide
   2.   Carbon dioxide and hydrogen sulphide
   3.   Sulphur dioxide and oxides of nitrogen
   4.   Hydrogen sulphide and oxides of nitrogen
8. If a town is having a population of 90000 then according to Manual of Water Supply and
   

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   Treatment, the fire demand will be ____________ kl.
   1.   948.68( 940 - 960)
   2.   988.68( 980 - 990)
   3.   648.68( 640 - 660)
   4.   548.68( 540 - 560)
9. Consider the following statements regarding population forecast:
   1. Arithmetic increase method gives a low value and is suitable for well settled and
   established community.
   2. Geometrical increase method gives much higher value and is mostly applicable for
   growing towns and cities having vast scope of expansion.
   3. The ‘S ’ shaped logistic curve for any city gives complete trend of growth of the city
   

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   choose right from beginning to saturation limit of population of the city.
   Which of the above statements are CORRECT?
   1.   a. 1 and 2
   2.   2 and 3
   3.   1 and 3
   4.   All of the above
10. 600 m3/day of water is to be obtained from a proposed infiltration gallery, which is
    placed at 6 m depth from sub-surface water table. The coefficient of permeability of the
    soil aquifer is 100 m/day. What is the length of gallery if the drawdown in the gallery on
    pumping is not to exceed 4 m? The radius of influence may be assumed to be 100 m.
    1.   37.5 m
    2.   34.3 m
    3.   31.6 m
    4.   29.8 m
11. Consider the following statements:
    1. Hydraulically equivalent section means that two sections can carry same discharge,
    while flowing full,on the same grade and of same material.
    

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    2. The drop manholes are provided in sewerage system when there is change in size of
    sewers.
    3. Bacterial action are responsible for crown corrosion.
    Which of the above statements are CORRECT?
    1.   1 and 2 only
    2.   2 and 3 only
    3.   . 1 and 3 only
    4.   All of these
12. A sample of water requires 113 ml of distilled water to render the odor barely
    detectable. What are the volume of sample and TON respectively?
    1.   87 and 1.77
    2.   113 and 1.77
    3.   113 and 2.3
    4.   87 and 2.3
13. JTU (Jackson Turbidity Unit) is based on ________ principle and FTU is based on
    ________ principle.
    1.   absorbing, scattering
    2.   scattering, absorbing
    3.   scattering, scattering
    4.   absorbing, absorbing
14. What are the daily flow capacity (m3/day) and the transmissivity (m2/day) of a sand
    

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    stone aquifer if:
    The aquifer height is 15 m
    The aquifer width is 800 m
    The aquifer length is 2 km
    The head change over the length of 2 km is 3 m
    Hydraulic conductivity is 6 × 10–7 m/s.
    1.   0.84 and 0.78
    2.   . 0.88 and 0.68
    3.   0.94 and 0.78
    4.   0.94 and 0.68
15. . The presence of gas in water is indicated by:
    1.   Fizzing sound
    2.   Foam
    3.   Bubbles
    4.   Colour change
16. When some chemical is mixed with water, _________ is formed?
    1.   Floc
    2.   Solution
    3.   Bubbles
    4.   Foam
17. What are the main constituents of the environmental cycles?
    1.   Water cycle and food cycle
    2.   Water cycle and nutrient cycle
    3.   Nutrient cycle
    4.   Water cycle and air cycle
18. Failures within hydrosphere in oxygen cycle can result in the development of:
    1.   Hyperoxic zones
    2.   Hypoxic zones
    3.   Hydrolic zones
    4.   Hydroxic zones
19. Which of the below leads to
    disturbance of nitrogen fixation in the soil?
    1.   Urban waste
    2.   Industrial effluents
    3.   Pesticides
    4.   Fertilizers
20. Hydrogen Peroxide is generated from:?
    1.   Photochemical smog products
    2.   Automobile exhausts
    3.   Explosive manufacturing industry
    4.   Thermal power plants