Chemical Environmental Engineering MCQs

Option A: Biological oxygen pond

Option B: Aerated lagoons

Option C: Trickling filters

Option D: Gravity separator having oil skimming devices

Correct Answer: Gravity separator having oil skimming devices ✔

Option A: 85

Option B: 105

Option C: 125

Option D: 145

Correct Answer: 105 ✔

Option A: Soluble and toxic organics

Option B: Suspended solids

Option C: Heavy metals and cyanides

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: 0.1

Option B: 1

Option C: 5

Option D: 25

Correct Answer: 5 ✔

Option A: 1-2

Option B: 5-10

Option C: 150-300

Option D: 2000-3000

Correct Answer: 150-300 ✔

Option A: Simple filtration

Option B: Oxidation followed by settling & filtration

Option C: Chemical coagulation

Option D: Chlorination only

Correct Answer: Oxidation followed by settling & filtration ✔

Option A: 0.5

Option B: 17

Option C: 357

Option D: 1097

Correct Answer: 17 ✔

Option A: Destroys/removes pathogen from the sewage

Option B: Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents

Option C: Destroys/removes pathogen much more effectively if the sewage is chlorinated

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Dental cavity

Option B: Tooth decay

Option C: Fluorosis

Option D: Respiratory disease

Correct Answer: Fluorosis ✔

Option A: Photochemical smog

Option B: Peroxyacetyl nitrate (PAN) or methyl nitrite

Option C: Benzopyrene

Option D: Polyacrylonitrile

Correct Answer: Peroxyacetyl nitrate (PAN) or methyl nitrite ✔

Option A: 5

Option B: 100

Option C: 250

Option D: 500

Correct Answer: 5 ✔

Option A: 50

Option B: 1000

Option C: 2000

Option D: 5000

Correct Answer: 50 ✔

Option A: Organic

Option B: Fatty

Option C: Inorganic

Option D: Dissolved

Correct Answer: Inorganic ✔

Option A: Respiratory ailments (e.g. bronchitis)

Option B: Skin diseases (e.g. dermatitis)

Option C: Silicosis

Option D: Blurred vision

Correct Answer: Skin diseases (e.g. dermatitis) ✔

Option A: Chlorination

Option B: Treating in biological oxygen pond

Option C: Chemical coagulation

Option D: None of these

Correct Answer: Treating in biological oxygen pond ✔

Option A: 30 to 70 kV DC

Option B: 30 to 70 kV AC

Option C: 230 V AC

Option D: 230 V DC

Correct Answer: 30 to 70 kV DC ✔

Option A: 10

Option B: 45

Option C: 90

Option D: 115

Correct Answer: 45 ✔

Option A: Hydrogen sulphide

Option B: Mercury

Option C: Cadmium

Option D: Asbestos

Correct Answer: Cadmium ✔

Option A: Forest fire

Option B: Deforestation

Option C: Volcanic eruption

Option D: None of these

Correct Answer: Volcanic eruption ✔

Option A: Fading of dyes on textiles

Option B: Corrosion, tarnishing & soiling of metals

Option C: Reduced strength of textiles

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Turbidity

Option B: Caustic embrittlement

Option C: Suspended silica

Option D: Dissolved oxygen

Correct Answer: Caustic embrittlement ✔

Option A: Oxides of sulphur

Option B: Oxides of nitrogen

Option C: Carbon monoxide

Option D: Hydrogen sulphide

Correct Answer: Oxides of sulphur ✔

Option A: Use of silencers

Option B: Green house gases

Option C: Vibration damping

Option D: Tree plantation

Correct Answer: Green house gases ✔

Option A: Hydrocarbons

Option B: Hydrogen fluoride

Option C: Hydrogen sulphides

Option D: Nitrogen dioxide

Correct Answer: Hydrogen fluoride ✔

Option A: 20

Option B: 100

Option C: 400

Option D: 200

Correct Answer: 400 ✔

Option A: 90

Option B: 120

Option C: 150

Option D: 180

Correct Answer: 120 ✔

Option A: Stratosphere

Option B: Thermosphere

Option C: Troposphere

Option D: Mesosphere

Correct Answer: Troposphere ✔

Option A: Foul smell and taste

Option B: Iron and manganese

Option C: Temporary hardness

Option D: Permanent hardness

Correct Answer: Temporary hardness ✔

Option A: Thermosphere

Option B: Stratosphere

Option C: Troposphere

Option D: Mesosphere

Correct Answer: Stratosphere ✔

Option A: Silica

Option B: Turbidity

Option C: Phenol

Option D: Dissolved oxygen

Correct Answer: Silica ✔

Option A: Separation

Option B: Anaerobic decomposition

Option C: Aerobic decomposition

Option D: None of these

Correct Answer: Anaerobic decomposition ✔

Option A: Radioactive

Option B: Organic

Option C: Inorganic

Option D: None of these

Correct Answer: Inorganic ✔

Option A: Fumes

Option B: Mists

Option C: Smoke

Option D: Aerosols

Correct Answer: Aerosols ✔

Option A: Anaerobic

Option B: Saprophytic

Option C: Aerobic

Option D: Parasitic

Correct Answer: Aerobic ✔

Option A: Carbonate

Option B: Calcium

Option C: Chloride

Option D: Sulphate

Correct Answer: Calcium ✔

Option A: Inversely proportional to viscosity of gas

Option B: Proportional to the viscosity & density of the gas

Option C: Proportional to the pressure of the gas

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Reduce SO2 content in

Option B: Catalytically convert SO2 to SO3 in

Option C: Increase the dew point of

Option D: None of these

Correct Answer: Reduce SO2 content in ✔

Option A: Petroleum refineries

Option B: Coal based thermal power plants

Option C: Pulp and paper plant

Option D: Metallurgical roasting & smelting plant

Correct Answer: Coal based thermal power plants ✔

Option A: Natural aeration of water stream

Option B: Photosynthetic action of algae

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Reduction in working efficiency of manpower

Option B: Fatigue

Option C: High breathing rate

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Food industry

Option B: Municipal sewage treatment

Option C: Petroleum refinery

Option D: Iron & steel plant

Correct Answer: Food industry ✔

Option A: Blood poisoning

Option B: Anaemia

Option C: Nervous system disorder

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Aluminium sulphate

Option B: Ferrous sulphate

Option C: Hydrated lime

Option D: Chloramine

Correct Answer: Chloramine ✔

Option A: Carbonates

Option B: Bi-carbonates

Option C: Iron & manganese

Option D: Arsenic

Correct Answer: Iron & manganese ✔

Option A: 1

Option B: 4

Option C: 8

Option D: 12

Correct Answer: 4 ✔

Option A: Suspended inorganic matter

Option B: Dissolved solids

Option C: Floating solids

Option D: Dissolved gases

Correct Answer: Suspended inorganic matter ✔

Option A: Dust & mists

Option B: Smoke & fumes

Option C: Photochemical smog & soot

Option D: None of these

Correct Answer: None of these ✔

Option A: Idle running

Option B: Acceleration

Option C: Cruising

Option D: Deceleration

Correct Answer: Idle running ✔

Option A: Respiratory disease (e.g. asthma)

Option B: Asphyxiation (suffocation) leading to death

Option C: Retardation in crop growth

Option D: Damage to building materials like marble

Correct Answer: Asphyxiation (suffocation) leading to death ✔

Option A: Filtration

Option B: Coagulation

Option C: Sedimentation

Option D: Disinfection

Correct Answer: Coagulation ✔

Option A: Ozone

Option B: Photochemical smog

Option C: Sulphur dioxide

Option D: All A., B. & C.

Correct Answer: Sulphur dioxide ✔

Option A: Dust catcher (gravity type)

Option B: Cyclone separator

Option C: Bag filter

Option D: Hollow wet scrubber

Correct Answer: Dust catcher (gravity type) ✔

Option A: 25

Option B: 50

Option C: 80

Option D: 120

Correct Answer: 80 ✔

Option A: 1

Option B: 3

Option C: 7

Option D: 20

Correct Answer: 20 ✔

Option A: Reynold stresses

Option B: Shear forces

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Methane

Option B: Nitrous oxide

Option C: Chlorofluoro carbons (CFC)

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Turbidity

Option B: Color (Hazen)

Option C: Total solids

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Decreases

Option B: Increases

Option C: Remain constant

Option D: May increase or decrease; depends on the chemical characteristics of polluted water

Correct Answer: Decreases ✔

Option A: Global warming

Option B: Green house

Option C: Atmospheric effect

Option D: Ionosphere

Correct Answer: Green house ✔

Option A: Cancer

Option B: Silicosis

Option C: Respiratory disease (e.g., asthma)

Option D: Reduced crop yield

Correct Answer: Cancer ✔

Option A: Dermatitis (skin disorder)

Option B: Cancer

Option C: Asphyxiation

Option D: Asthma

Correct Answer: Cancer ✔

Option A: Smog & ozone

Option B: Hydrogen fluoride & nitrogen oxides

Option C: Sulphur dioxide & spray of weed killers

Option D: Carbon monoxide

Correct Answer: Carbon monoxide ✔

Option A: Embrittlement & decrease of folding resistance of paper

Option B: Cracking of rubber products

Option C: Fading of dye on textiles

Option D: Damage of electrical insulator on high tension power line

Correct Answer: Cracking of rubber products ✔

Option A: CO, SO2 & H2S

Option B: CO2, NO & SO3

Option C: CO2, H2S & NO2

Option D: SO3, NO2 & CO2

Correct Answer: CO, SO2 & H2S ✔

Option A: Coal ash

Option B: Potassium cyanide

Option C: Ortho-xylene

Option D: None of these

Correct Answer: Potassium cyanide ✔

Option A: Hydrochloric acid

Option B: Lime

Option C: Copper sulphate

Option D: Sodium sulphate

Correct Answer: Lime ✔

Option A: Evaporation & chemical precipitation

Option B: Biological methods & adsorption in ion exchange materials

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

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Nitric acid making

Option B: Nitrogenous fertiliser

Option C: Detergent

Option D: Any of these

Correct Answer: Detergent ✔

Option A: 5

Option B: 100

Option C: 1000

Option D: 2000

Correct Answer: 5 ✔

Option A: Sedimentation tank

Option B: Circular clarifier

Option C: Mechanical flocculation

Option D: Chemical coagulation

Correct Answer: Chemical coagulation ✔

Option A: Ferrous sulphate

Option B: Alum

Option C: Lime

Option D: Hydrazine

Correct Answer: Alum ✔

Option A: 100

Option B: 1000

Option C: 400

Option D: 4000

Correct Answer: 100 ✔

Option A: Poor visibility due to sky darkening

Option B: Irritation in eyes

Option C: Respiratory trouble

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Forestation

Option B: Rain

Option C: Green house effect

Option D: Vegetation

Correct Answer: Green house effect ✔

Option A: 0.1 to 1

Option B: 3 to 6

Option C: 10 to 15

Option D: 15 to 20

Correct Answer: 3 to 6 ✔

Option A: Industrial chimney exhaust

Option B: Forest fire

Option C: Automobiles exhaust

Option D: Photochemical oxidation of organic matter

Correct Answer: Automobiles exhaust ✔

Option A: Incineration

Option B: Biological oxidation

Option C: Composting

Option D: None of these

Correct Answer: Composting ✔

Option A: SO2 & SO3

Option B: NO2

Option C: NH3

Option D: CO

Correct Answer: CO ✔

Option A: Filtration

Option B: Digestion

Option C: Sedimentation

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Quenching of hot coke

Option B: Discharging in the river stream

Option C: Filtration and recycling for cooling coke oven gas

Option D: None of these

Correct Answer: Quenching of hot coke ✔

Option A: Paralysis of muscles & loss of appetite

Option B: Nervous depression

Option C: Gastritis and diarrhea

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Air binding

Option B: Shrinkage of filtering media

Option C: Mud balls

Option D: Expansion of filtering media

Correct Answer: Mud balls ✔

Option A: 1 to 2

Option B: 4 to 5

Option C: 9 to 10

Option D: 15 to 20

Correct Answer: 4 to 5 ✔

Option A: Reduction in strength of leather & cloth

Option B: Acceleration of corrosion rates of metals

Option C: Increased drying & hardening time of paints

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Cancer

Option B: Bronchitis

Option C: Asphyxiation

Option D: Corrosion

Correct Answer: Bronchitis ✔

Option A: Alum (aluminium sulphate)

Option B: Lime

Option C: Ferric chloride

Option D: Sodium aluminate

Correct Answer: Alum (aluminium sulphate) ✔

Option A: Hearing loss

Option B: Rupture of ear drum

Option C: Nervousness & fatigue

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Colloids or aerosols

Option B: Powder

Option C: Dust

Option D: Smoke

Correct Answer: Colloids or aerosols ✔

Option A: Are large shallow artificial lakes also known as clarification lakes, maturation ponds or

Option B: Use micro-organisms/bacteria in presence of dissolved oxygen

Option C: Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: 3

Option B: 30

Option C: 7

Option D: 70

Correct Answer: 3 ✔

Option A: 1

Option B: 25

Option C: 150

Option D: 650

Correct Answer: 1 ✔

Option A: Foaming

Option B: Odour nuisances

Option C: Undesirable plant growth

Option D: Turbidity

Correct Answer: Undesirable plant growth ✔

Option A: Photochemical smog

Option B: Sulphur dioxide

Option C: Nitrogen dioxide

Option D: Dust particles

Correct Answer: Photochemical smog ✔

Option A: A primary pollutant

Option B: A secondary pollutant

Option C: Impervious to ultra-violet rays

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Sterilisation

Option B: Aeration

Option C: Disinfection

Option D: None of these

Correct Answer: Sterilisation ✔

Option A: 10-7

Option B: 7 × 10-7

Option C: 107

Option D: 7 × 107

Correct Answer: 10-7 ✔

Option A: Automobile exhaust

Option B: Blanketing effect of CO2 in the atmosphere

Option C: De-forestation

Option D: Thickening of ozone layer

Correct Answer: Blanketing effect of CO2 in the atmosphere ✔

Option A: Ionosphere

Option B: Troposphere

Option C: Stratosphere

Option D: None of these

Correct Answer: Troposphere ✔

Option A: Skin disorder

Option B: Bronchitis

Option C: Bone disease

Option D: Cancer

Correct Answer: Bronchitis ✔

Option A: 10

Option B: 200

Option C: 1000

Option D: 2000

Correct Answer: 200 ✔