Environmental Engineering In CE MCQ

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• TLV of mercury in potable (drinking) water is about __________ ppm.
  ক

  0.001

  খ

  0.1

  গ

  1

  ঘ

  5
• Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
  ক

  Reynold stresses

  খ

  Shear forces

  গ

  Both A & B

  ঘ

  Neither A nor B
• A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
  ক

  1000 to 2000

  খ

  3000 to 6000

  গ

  6000 to 9000

  ঘ

  10000 to 100000
• Which of the following is the most detrimental for water used in high pressure boiler?
  ক

  Silica

  খ

  Turbidity

  গ

  Phenol

  ঘ

  Dissolved oxygen
• Which of the following is not a natural source of air pollution?
  ক

  Volcanic eruptions and lightening discharges

  খ

  Biological decay of vegetable matter

  গ

  Photochemical oxidation of organic matter

  ঘ

  None of these
• Which of the following acts as a natural source of air pollution?
  ক

  Forest fire

  খ

  Deforestation

  গ

  Volcanic eruption

  ঘ

  None of these
• Industrial workers working in leather tanning & manufacturing units are prone to suffer from
  ক

  Respirtory ailments (e.g. bronchitis)

  খ

  Skin diseases (e.g. dermatities)

  গ

  Silicosis

  ঘ

  Blurred vision
• The pH value of oxidised sewage is about
  ক

  1.8

  খ

  6.2

  গ

  7.3

  ঘ

  13.4
• The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
  ক

  Dissolved oxygen content

  খ

  Biological oxygen demand

  গ

  Vapor pressure

  ঘ

  All of the above
• Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?
  ক

  Hydrogen

  খ

  Acetylene

  গ

  Carbon monoxide

  ঘ

  Ammonia
• Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by
  ক

  Chemical coagulation

  খ

  Floatation & skimming

  গ

  Centrifugation

  ঘ

  Ultrafiltration
• The common pollutant generated in chlor-alkali industry and battery manufacture is
  ক

  Mercury

  খ

  Brine

  গ

  Phosphate

  ঘ

  None of these
• Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
  ক

  CO

  খ

  SO₂

  গ

  NO_x

  ঘ

  CFC (chloro fluoro carbons)
• Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
  ক

  Fading of dyes on textiles

  খ

  Corrosion, tarnishing & soiling of metals

  গ

  Reduced strength of textiles

  ঘ

  All of the above
• The resistance of water to the passage of light through it is a measure of the
  ক

  Turbidity

  খ

  Color

  গ

  Hardness

  ঘ

  Dissolved gases
• Presence of nitrates in water in excess of 50 ppm causes
  ক

  Mathenoglobenemia

  খ

  Gastroentetitis

  গ

  Asphyxiation

  ঘ

  Tooth decay
• Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
  ক

  Quenching of hot coke

  খ

  Discharging in the river stream

  গ

  Filtration and recycling for cooling coke oven gas

  ঘ

  None of these
• Maximum permissible turbidity in potable water is __________ ppm.
  ক

  1

  খ

  10

  গ

  250

  ঘ

  1000
• The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the
  ক

  Catalytic conversion

  খ

  Green house effect

  গ

  Global warming

  ঘ

  Both B and C
• Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?
  ক

  CO₂

  খ

  H₂

  গ

  SO₃

  ঘ

  N₂
• __________ can not control the noise pollution.
  ক

  Use of silencers

  খ

  Green house gases

  গ

  Vibration damping

  ঘ

  Tree plantation
• For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
  ক

  10000

  খ

  5

  গ

  500

  ঘ

  1000
• The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
  ক

  20

  খ

  230

  গ

  750

  ঘ

  1500
• Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
  ক

  Blood poisoning

  খ

  Anaemia

  গ

  Nervous system disorder

  ঘ

  All of the above
• Workers working in __________ industry are most prone to white lung cancer.
  ক

  Coal mining

  খ

  Limestone mining

  গ

  Textile

  ঘ

  Asbestos
• What are the methods of treatment & disposal of radioactive wastes?
  ক

  Evaporation & chemical precipitation

  খ

  Biological methods & adsorption in ion exchange materials

  গ

  Fixing into a solid mass with cement and sinking deep in the sea

  ঘ

  All of the above
• Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?
  ক

  Smog & ozone

  খ

  Hydrogen fluoride & nitrogen oxides

  গ

  Sulphur dioxide & spray of weed killers

  ঘ

  Carbon monoxide
• Smoke is produced due to
  ক

  Insufficient supply of combustion air and insufficient time for combustion

  খ

  Poor quality of fuel and improper mixing of fuel & combustion air

  গ

  Poor design & overloading of furnace

  ঘ

  All of the above
• Carbonaceous particles having size less than 1 μm are called
  ক

  Grit

  খ

  Aggregates

  গ

  Aerosols

  ঘ

  Smoke
• Maximum permissible residual chlorine in treated water should be __________ mg/litre.
  ক

  0.001 to 0.01

  খ

  02 to 0.3

  গ

  2 to 3

  ঘ

  5 to 10