Chemical Environmental Engineering MCQs

Option A: Low excess air

Option B: Very high excess air

Option C: Gaseous fuel in the furnace

Option D: Liquid fuel in the furnace

Correct Answer: Very high excess air ✔

Option A: Grit

Option B: Aggregates

Option C: Aerosols

Option D: Smoke

Correct Answer: ✔

Option A: Moderately

Option B: Highly

Option C: Extremely

Option D: Very extremely

Correct Answer: Very extremely ✔

Option A: 50 ppm

Option B: 100 ppm

Option C: 300 ppm

Option D: 700 ppm

Correct Answer: 700 ppm ✔

Option A: I-131

Option B: Sr-90

Option C: Au-198

Option D: Ra-226

Correct Answer: Ra-226 ✔

Option A: Foaming from boilers

Option B: Its dissolved oxygen content

Option C: Its silica content

Option D: Caustic embrittlement

Correct Answer: Its dissolved oxygen content ✔

Option A: Mercury

Option B: Brine

Option C: Phosphate

Option D: None of these

Correct Answer: Mercury ✔

Option A: Highly

Option B: Moderately

Option C: Extremely

Option D: Very extremely

Correct Answer: Moderately ✔

Option A: Phosgene

Option B: Methyl isocyanate (MIC)

Option C: Carbon monoxide

Option D: Sulphur dioxide

Correct Answer: Methyl isocyanate (MIC) ✔

Option A: Chloro-alkali industry

Option B: Tanneries

Option C: Beverage plant

Option D: Phosphoric acid plant

Correct Answer: Chloro-alkali industry ✔

Option A: Dissolved oxygen content

Option B: Biological oxygen demand

Option C: Vapor pressure

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

Correct Answer: Dissolved oxygen content ✔

Option A: Phenol and cyanide

Option B: Chlorine

Option C: Alkalis

Option D: Suspended solids

Correct Answer: Phenol and cyanide ✔

Option A: Wet scrubber

Option B: Bag filter

Option C: Electrostatic precipitators

Option D: Dust catcher

Correct Answer: Electrostatic precipitators ✔

Option A: Aerobic

Option B: Pathogenic

Option C: Anaerobic

Option D: Non-pathogenic

Correct Answer: Pathogenic ✔

Option A: 10

Option B: 90

Option C: 800

Option D: 750

Correct Answer: 90 ✔

Option A: 0.002

Option B: 0.2

Option C: 1.2

Option D: 4.8

Correct Answer: 0.2 ✔

Option A: Carbon dioxide

Option B: Toluene

Option C: Carbon disulphide

Option D: Acetaldehyde

Correct Answer: Carbon dioxide ✔

Option A: Grit chamber

Option B: Detritus tank

Option C: Trickling filter

Option D: Skimming tank

Correct Answer: Detritus tank ✔

Option A: Deaeration of feed water

Option B: Enhancing pH of feed water by adding alkali

Option C: Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen

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

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

Option A: Respiratory & lung disease

Option B: Reduction in plant’s productivity owing to acid rain

Option C: Corrosion of building materials

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

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

Option A: Benzopyrene

Option B: Peroxyacetyl nitrate

Option C: Carbon monoxide

Option D: Sulphur dioxide

Correct Answer: Carbon monoxide ✔

Option A: 1 to 1.5

Option B: 6.5 to 8

Option C: 13 to 14

Option D: 4 to 5

Correct Answer: 6.5 to 8 ✔

Option A: Thermal power plant

Option B: Petroleum refinery

Option C: Nitric acid plant

Option D: Sulphuric acid plant

Correct Answer: Nitric acid plant ✔

Option A: Using the activities of bacteria and other micro organisms

Option B: Aerobic oxidation

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Low amount of excess combustion air

Option B: Large quantity of excess combustion air

Option C: Hydrocarbon fuel

Option D: Pulverised coal as fuel

Correct Answer: Low amount of excess combustion air ✔

Option A: Methemoglobinemia

Option B: Gastroenteritis

Option C: Asphyxiation

Option D: Tooth decay

Correct Answer: Methemoglobinemia ✔

Option A: Packed scrubber

Option B: Gravity settling chamber

Option C: Electrostatic precipitator

Option D: Hydrocyclone

Correct Answer: Electrostatic precipitator ✔

Option A: The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere

Option B: Stratosphere is rich in ozone and is located just above the troposphere

Option C: Troposphere is a turbulent dusty zone containing much of water vapor and clouds

Option D: The earth’s atmosphere is an envelope of gases extending upto a height of about 200 kms

Correct Answer: A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere
and characterised by a steady decrease in temperature is called stratosphere ✔

Option A: HF

Option B: SO2

Option C: H2S

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: 5

Option B: 50

Option C: 2000

Option D: 5000

Correct Answer: 5 ✔

Option A: 0.05

Option B: 1

Option C: 6.5

Option D: 15

Correct Answer: 6.5 ✔

Option A: Chlorine

Option B: Irradiation of water by ultraviolet light

Option C: Cation exchanger

Option D: Coagulation

Correct Answer: Chlorine ✔

Option A: Volcanic eruptions and lightening discharges

Option B: Biological decay of vegetable matter

Option C: Photochemical oxidation of organic matter

Option D: None of these

Correct Answer: None of these ✔

Option A: Turbidity

Option B: Odour

Option C: Hardness

Option D: Bacteria

Correct Answer: Bacteria ✔

Option A: EDTA

Option B: Electometric

Option C: Total count

Option D: Presumptive

Correct Answer: EDTA ✔

Option A: Dissolved solid

Option B: Suspended solid

Option C: Oil & fatty

Option D: Gritty & inorganic

Correct Answer: Oil & fatty ✔

Option A: CO2

Option B: SO2

Option C: Hydrocarbons

Option D: CFC (chloro fluoro carbon)

Correct Answer: CFC (chloro fluoro carbon) ✔

Option A: Thermosphere

Option B: Troposphere

Option C: Stratosphere

Option D: None of these

Correct Answer: Troposphere ✔

Option A: Automobile exhaust

Option B: Forest fire

Option C: Bacterial action in soil and swamp areas

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

Correct Answer: Automobile exhaust ✔

Option A: Coal mining

Option B: Limestone mining

Option C: Textile

Option D: Asbestos

Correct Answer: Textile ✔

Option A: 1

Option B: 5

Option C: 10

Option D: 50

Correct Answer: 1 ✔

Option A: Calcium

Option B: Fluorine

Option C: Phosphorous

Option D: Sulphur

Correct Answer: Fluorine ✔

Option A: Chemical coagulation

Option B: Floatation & skimming

Option C: Centrifugation

Option D: Ultra filtration

Correct Answer: Chemical coagulation ✔

Option A: 10

Option B: 20

Option C: 40

Option D: 80

Correct Answer: 40 ✔

Option A: Flood

Option B: Cyclone

Option C: Decrease in food productivity

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

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

Option A: Ozone and iodine

Option B: Chlorine or its compounds

Option C: Ultraviolet light for irradiation of water

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

Correct Answer: D. All A., B. & C. ✔

Option A: Dilution with inert material

Option B: Discharging to atmosphere through tall stacks after dilution

Option C: Disposing off in rivers & oceans

Option D: Filling in steel crates and shooting it off out of earth’s gravity

Correct Answer: D. Filling in steel crates and shooting it off out of earth’s gravity ✔

Option A: Catalytic conversion

Option B: Green house effect

Option C: Global warming

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Active carbon

Option B: Silica gel

Option C: Bog iron (iron oxide)

Option D: Pulverised limestone

Correct Answer: Silica gel ✔

Option A: CO2

Option B: H2

Option C: SO3

Option D: N2

Correct Answer: SO3 ✔

Option A: Mufflers (silencers)

Option B: Acoustic absorbent

Option C: Lagging of noisy duct

Option D: None of these

Correct Answer: Mufflers (silencers) ✔

Option A: 0.5

Option B: 1

Option C: 3.5

Option D: 9.05

Correct Answer: 3.5 ✔

Option A: Coagulation

Option B: Sterilisation

Option C: Disinfection

Option D: Sedimentation

Correct Answer: Disinfection ✔

Option A: Acidic

Option B: Neutral

Option C: Alkaline

Option D: Highly acidic

Correct Answer: Alkaline ✔

Option A: 5

Option B: 50

Option C: 500

Option D: 5000

Correct Answer: 5 ✔

Option A: 22

Option B: 42

Option C: 332

Option D: 1050

Correct Answer: 42 ✔

Option A: Bag filter

Option B: Scrubber

Option C: Electrostatic precipitator

Option D: Cyclone separator

Correct Answer: Electrostatic precipitator ✔

Option A: 25

Option B: 50

Option C: 70

Option D: 85

Correct Answer: 50 ✔

Option A: SPM

Option B: Thermal pollution

Option C: Radioactive rays

Option D: Noise pollution

Correct Answer: SPM ✔

Option A: Roentgen

Option B: Decibel

Option C: Hertz

Option D: None of these

Correct Answer: Decibel ✔

Option A: Nothing but black smoke

Option B: A combination of smoke and fog

Option C: A liquid particle resulting from vapor condensation

Option D: A solid particle e.g. fly-ash

Correct Answer: A combination of smoke and fog ✔

Option A: < 1

Option B: 10-100

Option C: 100-200

Option D: 100-1000

Correct Answer: < 1 ✔

Option A: 10000

Option B: 5

Option C: 500

Option D: 1000

Correct Answer: 5 ✔

Option A: CO

Option B: SO2

Option C: NOx

Option D: CFC (chloro fluoro carbons)

Correct Answer: CO ✔

Option A: Potable water

Option B: Cooling water

Option C: Distilled water

Option D: Industrial effluents

Correct Answer: Industrial effluents ✔

Option A: Stratosphere

Option B: Troposphere

Option C: Ionosphere

Option D: None of these

Correct Answer: Stratosphere ✔

Option A: 102

Option B: 105

Option C: 109

Option D: 1015

Correct Answer: 105 ✔

Option A: 20

Option B: 230

Option C: 750

Option D: 1500

Correct Answer: 230 ✔

Option A: 105

Option B: 135

Option C: 160

Option D: 185

Correct Answer: 135 ✔

Option A: Color

Option B: Bad taste

Option C: Foul odour

Option D: Bacteria

Correct Answer: Bacteria ✔

Option A: Acidity

Option B: Alkalinity

Option C: Hardness

Option D: Iron & zinc

Correct Answer: Hardness ✔

Option A: Of clotting of blood

Option B: Of jamming of respiratory tract

Option C: It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it

Option D: It forms CO2 by combining with oxygen present in the blood

Correct Answer: C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
incapable of absorbing oxygen ✔

Option A: Mercury

Option B: Arsenic

Option C: Aluminium

Option D: Lead

Correct Answer: Aluminium ✔