Chemical Environmental Engineering MCQs

Option A: Oxidation

Option B: Reduction

Option C: Dehydration

Option D: Fermentation

Correct Answer: Oxidation ✔

Option A: Combustion

Option B: Urea

Option C: Biomass burning

Option D: Trees

Correct Answer: Combustion ✔

Option A: Tintometer

Option B: Colorimeter

Option C: Electro-chemical cell

Option D: Turbidimeter

Correct Answer: Tintometer ✔

Option A: 10 to 20

Option B: 100 to 200

Option C: 1500 to 2500

Option D: 4000 to 5000

Correct Answer: 100 to 200 ✔

Option A: Cesspool

Option B: Lagoon

Option C: Skimming mill

Option D: Septic tank

Correct Answer: Septic tank ✔

Option A: 60

Option B: 90

Option C: 105

Option D: 120

Correct Answer: 90 ✔

Option A: 0.001 to 0.01

Option B: 0.2 to 0.3

Option C: 2 to 3

Option D: 5 to 10

Correct Answer: 0.2 to 0.3 ✔

Option A: Asphyxiation (suffocation)

Option B: Shortness of breath

Option C: Tuberculosis

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

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

Option A: 2 to 4

Option B: 8 to 12

Option C: 16 to 20

Option D: 24 to 32

Correct Answer: 2 to 4 ✔

Option A: Fats

Option B: Carbohydrates

Option C: Salts of metals

Option D: Protein

Correct Answer: Salts of metals ✔

Option A: Air

Option B: Water

Option C: Noise

Option D: Radioactive

Correct Answer: Air ✔

Option A: Refrigerators

Option B: Xerox machines

Option C: Dermatological photo-therapy equipments

Option D: High voltage electrical equipments

Correct Answer: Refrigerators ✔

Option A: By reaction of hydrocarbon & nitric oxide in presence of sunlight

Option B: Appears only on sunny days

Option C: Is harmful for crops and trees also besides causing eye irritation & asthma

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

Correct Answer: D. All A., B. & C. ✔

Option A: Asphyxiation

Option B: Shortness of breath

Option C: Tuberculosis

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: Stratosphere

Option B: Troposphere

Option C: Ionosphere

Option D: None of these

Correct Answer: Troposphere ✔

Option A: Chlorine

Option B: Alkalis

Option C: Benzene hexachloride

Option D: Alkyl benzene sulphonate (ABS)

Correct Answer: Chlorine ✔

Option A: Bone decay

Option B: Cancer

Option C: Asphyxiation (suffocation)

Option D: Anemia

Correct Answer: Cancer ✔

Option A: Turbidity

Option B: Color

Option C: Hardness

Option D: Dissolved gases

Correct Answer: Turbidity ✔

Option A: Foodstuffs

Option B: Woolen clothes

Option C: Metallic powder

Option D: None of these

Correct Answer: Foodstuffs ✔

Option A: Grey

Option B: Dark brown

Option C: Red

Option D: Black

Correct Answer: Grey ✔

Option A: Positively charged

Option B: Negatively charged

Option C: Neutral

Option D: Combination of all A., B. & C.

Correct Answer: D. Combination of all A., B. & C. ✔

Option A: 80

Option B: 100

Option C: 125

Option D: 150

Correct Answer: 100 ✔

Option A: Hydrogen

Option B: Carbon dioxide

Option C: Ozone

Option D: None of these

Correct Answer: Ozone ✔

Option A: Mercury

Option B: Lead

Option C: Fluoride

Option D: Arsenic

Correct Answer: Fluoride ✔

Option A: Acts as a green house gas thereby raising earth’s temperature

Option B: Causes asphyxia

Option C: Causes increase in sea level

Option D: Enhances the green house effect

Correct Answer: Causes asphyxia ✔

Option A: Coagulation

Option B: Filtration

Option C: Anion exchanger

Option D: Preheating it

Correct Answer: Anion exchanger ✔

Option A: 1

Option B: 7

Option C: 19

Option D: 82

Correct Answer: 7 ✔

Option A: Hydrogen

Option B: Acetylene

Option C: Carbon monoxide

Option D: Ammonia

Correct Answer: Acetylene ✔

Option A: Iron

Option B: Zinc

Option C: Iodine

Option D: Bromine

Correct Answer: Iron ✔

Option A: CO2

Option B: CH4

Option C: CO

Option D: H2

Correct Answer: CH4 ✔

Option A: Nitric acid

Option B: Sulphuric acid

Option C: Chlor alkali

Option D: Iron & steel

Correct Answer: Sulphuric acid ✔

Option A: Industrial chimney exhaust

Option B: Automobiles exhaust

Option C: Photochemical reaction in polluted atmosphere

Option D: Burning of domestic fuel

Correct Answer: Automobiles exhaust ✔

Option A: Bog iron

Option B: Limestone powder or alkalised alumina

Option C: Silica gel

Option D: Active carbon

Correct Answer: Limestone powder or alkalised alumina ✔

Option A: High temperature incineration

Option B: Pathological incineration

Option C: Pyrolysis

Option D: Underground burial in concrete containers

Correct Answer: Underground burial in concrete containers ✔

Option A: 84

Option B: 88

Option C: 80

Option D: 92

Correct Answer: 84 ✔

Option A: Files

Option B: Algae

Option C: Micro-organisms

Option D: Mosquitoes

Correct Answer: Micro-organisms ✔

Option A: 1.8

Option B: 6.2

Option C: 7.3

Option D: 13.4

Correct Answer: 7.3 ✔

Option A: Tanneries

Option B: Glass & ceramic

Option C: Beverages

Option D: Any of these

Correct Answer: Beverages ✔

Option A: Grinding

Option B: Machining

Option C: Cutting

Option D: Polishing

Correct Answer: Polishing ✔

Option A: CO

Option B: CO2

Option C: NO

Option D: Hydrocarbons

Correct Answer: CO ✔

Option A: Preheating of feed water

Option B: Reduction in hardness, silica & alumina in feed water

Option C: Keeping the pH value of feed water just below 7

Option D: Eliminating H2S in feed water

Correct Answer: Reduction in hardness, silica & alumina in feed water ✔

Option A: 120

Option B: 140

Option C: 170

Option D: 200

Correct Answer: 170 ✔

Option A: Turbidity

Option B: Disease

Option C: Bad odour

Option D: Bad taste & colour

Correct Answer: Disease ✔

Option A: 0.1

Option B: 25

Option C: 100

Option D: 1000

Correct Answer: 0.1 ✔

Option A: Biological oxygen treatment

Option B: Coagulation and filtration

Option C: Adsorption in ion exchange materials

Option D: None of these

Correct Answer: Adsorption in ion exchange materials ✔

Option A: Silica gel

Option B: Active carbon

Option C: Bog iron

Option D: Limestone powder

Correct Answer: Bog iron ✔

Option A: 1

Option B: 10

Option C: 250

Option D: 1000

Correct Answer: 1 ✔

Option A: Blood poisoning

Option B: Anaemia

Option C: Nervous system disorder

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

Correct Answer: D. All A., B. & C. ✔

Option A: Allows visible solar radiation (ultraviolet) of short wave-length to pass through

Option B: Reflects and absorbs the longer wavelength (infra-red) radiations

Option C: Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming

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

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

Option A: NOx

Option B: Hg

Option C: SO2

Option D: F

Correct Answer: SO2 ✔

Option A: Smoke

Option B: Powder

Option C: Grit

Option D: Aggregates

Correct Answer: Powder ✔

Option A: Suppression of noise at the source itself

Option B: Path control of noise

Option C: Protection of operating personnel

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

Correct Answer: D. All A., B. & C. ✔

Option A: Arizona (U.S.A.)

Option B: Chernobyl (undivided U.S.S.R.)

Option C: Pennsylvania (U.S.A.)

Option D: Moscow (U.S.S.R.)

Correct Answer: Chernobyl (undivided U.S.S.R.) ✔

Option A: Dermatitis (skin disorder)

Option B: Cancer

Option C: Asphyxiation (suffocation)

Option D: Asthma

Correct Answer: Cancer ✔

Option A: 35

Option B: 75

Option C: 95

Option D: 105

Correct Answer: 75 ✔

Option A: 1-2

Option B: 5-10

Option C: 90-120

Option D: 1500-2500

Correct Answer: 90-120 ✔

Option A: Coal

Option B: Uranium ore

Option C: Iron ore

Option D: Lime

Correct Answer: Coal ✔

Option A: 1000 to 2000

Option B: 3000 to 6000

Option C: 6000 to 9000

Option D: 10000 to 100000

Correct Answer: 10000 to 100000 ✔

Option A: 75

Option B: 95

Option C: 120

Option D: 140

Correct Answer: 95 ✔

Option A: Coal

Option B: Silica

Option C: Iron

Option D: None of these

Correct Answer: Iron ✔

Option A: Sludge disposal

Option B: Reduction of excessive flow in sewers

Option C: Biological treatment of wastes

Option D: None of these

Correct Answer: Sludge disposal ✔

Option A: Automobile exhaust

Option B: Flue gas of coal based power plant

Option C: Exhaust of nitric acid plant

Option D: Exhaust of sulphuric acid plant

Correct Answer: Automobile exhaust ✔

Option A: Diffusion of

Option B: Centrifugal force on

Option C: Gravitational force on

Option D: Electrostatic force on

Correct Answer: Centrifugal force on ✔

Option A: Deforestation

Option B: Rapid industrialisation

Option C: Increased transportation activity

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

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

Option A: Explosion

Option B: Non biodegradable foam

Option C: Undesirable plant growth

Option D: Corrosion

Correct Answer: Explosion ✔

Option A: Acetylene

Option B: Petrol vapor

Option C: Hydrogen

Option D: Carbon monoxide

Correct Answer: Acetylene ✔

Option A: Conversion of CO into CO2 in the second compartment

Option B: Conversion of NOx into N2 and NH3 in the first compartment

Option C: Oxidation of unburnt hydrocarbon fuel in the second compartment

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

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

Option A: 20

Option B: 60

Option C: 90

Option D: 120

Correct Answer: 90 ✔

Option A: Insufficient supply of combustion air and insufficient time for combustion

Option B: Poor quality of fuel and improper mixing of fuel & combustion air

Option C: Poor design & overloading of furnace

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

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

Option A: June

Option B: December

Option C: July

Option D: September

Correct Answer: June ✔

Option A: Alum

Option B: Bleaching powder

Option C: Activated carbon

Option D: Copper sulphate

Correct Answer: Activated carbon ✔

B. Cooling and freezing of water kills the bacteria present in it
C. With increasing boiler operating pressure of steam, the maximum allowable concentration of
silica in feed water goes on decreasing
D. Dissolved oxygen content in high pressure boiler feed water should be nil

Correct Answer: Cooling and freezing of water kills the bacteria present in it ✔

Option A: Dental cavities

Option B: Scale formation

Option C: Water-borne disease

Option D: Corrosion

Correct Answer: Dental cavities ✔

Option A: Coagulation and flocculation of colloids

Option B: Oxidation of carbonaceous matter to CO2

Option C: Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter

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

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

Option A: 0.001

Option B: 0.1

Option C: 1

Option D: 5

Correct Answer: 0.001 ✔

Option A: Reduction in its dissolved oxygen content

Option B: Discoloration of bathroom fixtures

Option C: Temporary hardness

Option D: None of these

Correct Answer: Discoloration of bathroom fixtures ✔

Option A: Undesirable plants growth

Option B: Depletion of oxygen

Option C: Fire hazards

Option D: Explosion hazards

Correct Answer: Depletion of oxygen ✔

Option A: Cancer

Option B: Asthma

Option C: Silicosis

Option D: Fluorosis (bone disease)

Correct Answer: Silicosis ✔

Option A: Bacterial stability factor

Option B: Relative stability

Option C: Biological oxygen demand (BOD)

Option D: Oxygen ion concentration

Correct Answer: Relative stability ✔

Option A: t = 15 – 0.0065h

Option B: t = 15 + 0.0065h

Option C: t = 0.0035h -15

Option D: t = 15 – 0.0035h

Correct Answer: A. t = 15 – 0.0065h ✔

Option A: Hydrocarbons

Option B: NOx

Option C: SO2

Option D: CO

Correct Answer: NOx ✔

Option A: Diameter

Option B: Inlet gas velocity

Option C: Overall height

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

Correct Answer: D. All A., B. & C. ✔

Option A: Pipe vibrations

Option B: Cavitation

Option C: Boundary layer separation

Option D: Fluctuation in liquid flow

Correct Answer: Cavitation ✔

Option A: With greater number of blades

Option B: Of increased diameter

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: CO, CO2 & SO2

Option B: H2S, NO & SO3

Option C: CO2, H2S & NO2

Option D: SO3, NO2 & CO2

Correct Answer: CO, CO2 & SO2 ✔

Option A: Oxidation

Option B: Imhoff tank

Option C: Lagoon

Option D: Skimming tank

Correct Answer: Oxidation ✔

Option A: Biological oxygen pond

Option B: Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

Option C: Lagoons

Option D: Filtration

Correct Answer: Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) ✔

Option A: Bronchitis

Option B: Silicosis

Option C: Pneumoconiosis

Option D: None of these

Correct Answer: Silicosis ✔

Option A: Grit

Option B: Dust

Option C: Powder

Option D: Smoke

Correct Answer: Grit ✔

Option A: By chemical coagulation

Option B: In sedimentation tanks equipped with mechanical scrapper

Option C: In vacuum filter

Option D: In clarifiers

Correct Answer: In sedimentation tanks equipped with mechanical scrapper ✔

Option A: Dissolved gases

Option B: Suspended solids

Option C: Dissolved solids

Option D: None of these

Correct Answer: Dissolved gases ✔

Option A: CO

Option B: SO2

Option C: NO2

Option D: CO2

Correct Answer: SO2 ✔

Option A: Lagooning

Option B: Activated carbon adsorption

Option C: Biological oxidation pond

Option D: Chemical coagulation

Correct Answer: Activated carbon adsorption ✔

Option A: Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

Option B: COD is determined by oxidising the organic matter present in water with potassium

Option C: COD is related to BOD of a given waste in water but the relationship varies for different

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

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

Option A: 0.01

Option B: 0.1

Option C: 1

Option D: 4

Correct Answer: 4 ✔

Option A: Sedimentation

Option B: Skimming off

Option C: Chlorination

Option D: Biological oxidation

Correct Answer: Sedimentation ✔

Option A: Ion exchange process

Option B: Oxidation followed by settling & filtration

Option C: Lime soda process or manganese zeolite process

Option D: Chlorination

Correct Answer: Chlorination ✔

Option A: Characterisation of solid wastes

Option B: Organic concentration in gaseous effluents

Option C: Characterisation of liquid effluents

Option D: Characterisation of boiler feed water

Correct Answer: Characterisation of liquid effluents ✔

Option A: ‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

Option B: The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed

Option C: ‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where

Option D: ‘Green house’ is colder than the outside atmosphere

Correct Answer: D. ‘Green house’ is colder than the outside atmosphere ✔

Option A: Gravity settling chamber

Option B: Cyclone separator

Option C: Electrostatic precipitator

Option D: Bag filter

Correct Answer: Electrostatic precipitator ✔