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Latest UPPCB Assistant Environmental Engineer Exam Question (Objective Questions), MCQ in English

Subjects : Environmental Engineering, General Aptitude

Question Bank UPPCB Assistant Environmental Engineer Exam - English
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Environmental Engineering

Question 1Single Answer
What is the acceptable pH range for drinking water as per Bureau of Indian Standards IS 10500?
  1. A
    6.5–8.5
  2. B
    5.0–6.5
  3. C
    7.5–9.5
  4. D
    4.5–6.0
Question 2Single Answer
What is the desirable limit of Total Dissolved Solids (TDS) in drinking water as per IS 10500?
  1. A
    500 mg/L
  2. B
    250 mg/L
  3. C
    100 mg/L
  4. D
    1000 mg/L
Question 3Single Answer
Turbidity in drinking water is measured in which unit?
  1. A
    mg/L
  2. B
    NTU
  3. C
    ppm
  4. D
    µg/L
Question 4Single Answer
Which parameter represents the amount of oxygen required to biologically decompose organic matter in water?
  1. A
    COD
  2. B
    TDS
  3. C
    DO
  4. D
    BOD
Question 5Single Answer
Dissolved Oxygen (DO) in good quality drinking water should generally be?
  1. A
    Less than 2 mg/L
  2. B
    Zero
  3. C
    More than 20 mg/L
  4. D
    Around 4–6 mg/L
Question 6Single Answer
Which organism is commonly used as an indicator of fecal contamination in water?
  1. A
    E. coli
  2. B
    Algae
  3. C
    Protozoa
  4. D
    Fungi
Question 7Single Answer
Which physical characteristic of water affects its aesthetic acceptability?
  1. A
    Hardness
  2. B
    Color
  3. C
    BOD
  4. D
    COD
Question 8Single Answer
Hardness of water is mainly caused by the presence of which ions?
  1. A
    Sodium and Potassium
  2. B
    Chloride and Sulfate
  3. C
    Iron and Manganese
  4. D
    Calcium and Magnesium
Question 9Single Answer
Temporary hardness of water is mainly due to?
  1. A
    Sulfates of Ca and Mg
  2. B
    Chlorides of Ca and Mg
  3. C
    Bicarbonates of Ca and Mg
  4. D
    Nitrates of Ca and Mg
Question 10Single Answer
Which chemical parameter causes blue baby syndrome in infants?
  1. A
    Fluoride
  2. B
    Chloride
  3. C
    Nitrate
  4. D
    Iron
Question 11Single Answer
Fluoride concentration in drinking water above which level may cause fluorosis?
  1. A
    1.5 mg/L
  2. B
    1.0 mg/L
  3. C
    0.5 mg/L
  4. D
    3.0 mg/L
Question 12Single Answer
The most commonly used method for population forecasting in water supply design is?
  1. A
    Arithmetic Increase Method
  2. B
    Geometric Increase Method
  3. C
    Incremental Increase Method
  4. D
    All of the above
Question 13Single Answer
The Arithmetic Increase Method assumes that population increases by?
  1. A
    Constant percentage
  2. B
    Constant number
  3. C
    Decreasing rate
  4. D
    Increasing rate
Question 14Single Answer
In Geometric Increase Method, population grows by?
  1. A
    Constant difference
  2. B
    Constant ratio
  3. C
    Decreasing ratio
  4. D
    Random ratio
Question 15Single Answer
The design period for water supply systems is generally?
  1. A
    5 years
  2. B
    10 years
  3. C
    30 years
  4. D
    100 years
Question 16Single Answer
Maximum daily demand is generally how much times the average daily demand?
  1. A
    1.2
  2. B
    2.7
  3. C
    1.8
  4. D
    1.5
Question 17Single Answer
Maximum hourly demand is approximately how many times the average hourly demand?
  1. A
    1.5
  2. B
    2.0
  3. C
    3.0
  4. D
    4.0
Question 18Single Answer
Per capita water demand in Indian cities is generally taken as?
  1. A
    50 LPCD
  2. B
    70 LPCD
  3. C
    135 LPCD
  4. D
    300 LPCD
Question 19Single Answer
Which process removes dissolved gases like CO₂ and H₂S from water?
  1. A
    Sedimentation
  2. B
    Aeration
  3. C
    Filtration
  4. D
    Chlorination
Question 20Single Answer
Aeration also helps in removal of?
  1. A
    Sodium
  2. B
    Iron and Manganese
  3. C
    Nitrate
  4. D
    Sulfate
Question 21Single Answer
Sedimentation removes impurities mainly by?
  1. A
    Gravitational settling
  2. B
    Filtration
  3. C
    Chemical reaction
  4. D
    Oxidation
Question 22Single Answer
Which chemical is most commonly used as a coagulant in water treatment?
  1. A
    Alum
  2. B
    Sodium chloride
  3. C
    Potassium nitrate
  4. D
    Calcium carbonate
Question 23Single Answer
The process of gentle stirring after coagulation to form flocs is called?
  1. A
    Flocculation
  2. B
    Aeration
  3. C
    Filtration
  4. D
    Disinfection
Question 24Single Answer
Rapid sand filters operate at filtration rates approximately?
  1. A
    100–200 L/m²/hr
  2. B
    10–20 L/m²/hr
  3. C
    3000–6000 L/m²/hr
  4. D
    1 L/m²/hr
Question 25Single Answer
Slow sand filters operate at filtration rates approximately?
  1. A
    3000–6000 L/m²/hr
  2. B
    100–200 L/m²/hr
  3. C
    1–5 L/m²/hr
  4. D
    10000 L/m²/hr
Question 26Single Answer
The biological layer formed in slow sand filters is called?
  1. A
    Schmutzdecke
  2. B
    Biofilm
  3. C
    Floc layer
  4. D
    Sand coat
Question 27Single Answer
Backwashing is commonly used in which filter?
  1. A
    Slow sand filter
  2. B
    Pressure tank
  3. C
    Rapid sand filter
  4. D
    Aeration tower
Question 28Single Answer
The most widely used disinfectant in water treatment plants is?
  1. A
    Ozone
  2. B
    UV radiation
  3. C
    Chlorine
  4. D
    Bromine
Question 29Single Answer
The minimum residual chlorine recommended in drinking water after 30 minutes contact time is about?
  1. A
    3 mg/L
  2. B
    1.5 mg/L
  3. C
    0.2 mg/L
  4. D
    5 mg/L
Question 30Single Answer
Breakpoint chlorination refers to?
  1. A
    Minimum chlorine dose
  2. B
    Point where chlorine demand is satisfied
  3. C
    Maximum chlorine dose
  4. D
    Removal of hardness
Question 31Single Answer
Ozonation is mainly used for?
  1. A
    Hardness removal
  2. B
    Fluoride removal
  3. C
    Disinfection
  4. D
    pH correction
Question 32Single Answer
UV disinfection works by?
  1. A
    Oxidation
  2. B
    Sedimentation
  3. C
    DNA damage of microorganisms
  4. D
    Coagulation
Question 33Single Answer
Lime-soda process is used for?
  1. A
    Disinfection
  2. B
    Aeration
  3. C
    Softening of water
  4. D
    Filtration
Question 34Single Answer
Which compound is added in lime-soda process for removing permanent hardness?
  1. A
    Sodium carbonate
  2. B
    Calcium oxide
  3. C
    Sodium chloride
  4. D
    Potassium sulfate
Question 35Single Answer
Distribution systems are designed mainly to supply water with?
  1. A
    High turbidity
  2. B
    High hardness
  3. C
    Adequate pressure
  4. D
    High BOD
Question 36Single Answer
Which layout of water distribution system is most reliable?
  1. A
    Dead end system
  2. B
    Tree system
  3. C
    Radial system
  4. D
    Grid iron system
Question 37Single Answer
In a dead-end distribution system, water flow is generally?
  1. A
    One directional
  2. B
    Circular
  3. C
    Random
  4. D
    Multidirectional
Question 38Single Answer
Leakage in distribution systems can be detected using?
  1. A
    Filtration
  2. B
    Chlorination
  3. C
    Aeration
  4. D
    Pressure testing
Question 39Single Answer
Which instrument is commonly used for leak detection in pipelines?
  1. A
    Spectrophotometer
  2. B
    Acoustic leak detector
  3. C
    TDS meter
  4. D
    pH meter
Question 40Single Answer
The minimum pressure recommended in water distribution system is about?
  1. A
    2 m
  2. B
    100 m
  3. C
    20 m
  4. D
    7 m
Question 41Single Answer
Water treatment plant capacity is generally based on?
  1. A
    Maximum hourly demand
  2. B
    Maximum daily demand
  3. C
    Average daily demand
  4. D
    Fire demand
Question 42Single Answer
Fire demand in water supply is estimated using?
  1. A
    Manning formula
  2. B
    Hardy Cross method
  3. C
    Darcy formula
  4. D
    Kuichling formula
Question 43Single Answer
Which unit process removes suspended solids after coagulation?
  1. A
    Sedimentation
  2. B
    Aeration
  3. C
    Disinfection
  4. D
    Softening
Question 44Single Answer
Jar test is conducted to determine?
  1. A
    Filtration rate
  2. B
    Chlorine dose
  3. C
    Coagulant dosage
  4. D
    Hardness
Question 45Single Answer
Chlorine demand is defined as?
  1. A
    Total chlorine dose
  2. B
    Residual chlorine only
  3. C
    Chlorine added minus residual chlorine
  4. D
    Hardness level
Question 46Single Answer
Which factor affects coagulation efficiency?
  1. A
    All of the above
  2. B
    Temperature
  3. C
    Mixing intensity
  4. D
    pH
Question 47Single Answer
Rapid mixing in coagulation is usually completed within?
  1. A
    1 week
  2. B
    10 hours
  3. C
    5 days
  4. D
    Few seconds
Question 48Single Answer
Flocculation detention time is usually about?
  1. A
    2 minutes
  2. B
    20–30 minutes
  3. C
    1 hour
  4. D
    5 hours
Question 49Single Answer
Which water treatment step normally follows coagulation?
  1. A
    Disinfection
  2. B
    Aeration
  3. C
    Softening
  4. D
    Sedimentation
Question 50Single Answer
Taste and odor problems in water are commonly caused by?
  1. A
    Fluoride
  2. B
    Sand
  3. C
    Iron
  4. D
    Algae
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