A liquid particle resulting from vapor condensation

Practice Environmental Engineering In CE Multiple Choice Questions Quiz-8

Q.1

Photochemical smog is formed from automobile exhaust

By reaction of hydrocarbon & nitric oxide in presence of sunlight
Appears only on sunny days
Is harmful for crops and trees also besides causing eye irritation & asthma
All of the above

Q.2

Smog is

Nothing but black smoke
A combination of smoke and fog
A liquid particle resulting from vapor condensation
A solid particle e.g. flyash

Q.3

Smoke is produced due to

Insufficient supply of combustion air and insufficient time for combustion
Poor quality of fuel and improper mixing of fuel & combustion air
Poor design & overloading of furnace
All of the above

Q.4

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

Blood poisoning
Anaemia
Nervous system disorder
All of the above

Q.5

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

20
230
750
1500

Q.6

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

I-131
Sr-90
Au-198
Ra-226

Q.7

The progressive warming up of the earth's surface is mainly due to the

Automobile exhaust
Blanketing effect of CO₂ in the atmosphere
De-forestation
Thickening of ozone layer

Q.8

Pick out the wrong statement.

Biological oxygen demand (BOD) is a characteristic and not a constituent of water
BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organi
BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)
None of these

Q.9

Fresh domestic sewage is __________ in color.

Grey
Dark brown
Red
Black

Q.10

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

Smog & ozone
Hydrogen fluoride & nitrogen oxides
Sulphur dioxide & spray of weed killers
Carbon monoxide

Q.11

What are the methods of treatment & disposal of radioactive wastes?

Evaporation & chemical precipitation
Biological methods & adsorption in ion exchange materials
Fixing into a solid mass with cement and sinking deep in the sea
All of the above

Q.12

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

10000
5
500
1000

Q.13

__________ can not control the noise pollution.

Use of silencers
Green house gases
Vibration damping
Tree plantation

Q.14

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Bacterial stability factor
Relative stability
Biological oxygen demand (BOD)
Oxygen ion concentration

Q.15

Reinglemann chart is used for the measurement of the

Combustibles present in automobile exhaust
Smoke density from a chimey
Exhaust gas density
Flue gas temperature

Q.16

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

0.001 to 0.01
02 to 0.3
2 to 3
5 to 10

Q.17

Carbonaceous particles having size less than 1 μm are called

Grit
Aggregates
Aerosols
Smoke

Q.18

Pick out the wrong statement.

Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust
NO₂ is capable of penetrating the troposphere and can absorb both ultraviolet & visible light
Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees
H₂S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO₂

Q.19

Workers working in __________ industry are most prone to white lung cancer.

Coal mining
Limestone mining
Textile
Asbestos

Q.20

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

Blood poisoning
Anaemia
Nervous system disorder
All of the above

Q.21

Polyvinyl chloride containers are not suitable for storing

Foodstuffs
Woolen clothes
Metallic powder
None of these

Q.22

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

With greater number of blades
Of increased diameter
Both A & B
Neither A nor B

Q.23

Growth of __________ is promoted by the presence of manganese in water.

Files
Algae
Micro-organisms
Mosquitoes

Q.24

Deaeration of high pressure boiler feed water is done to reduce

Foaming from boilers
Its dissolved oxygen content
Its silica content
Caustic embrittlement

Q.25

Salt content in sea water is about __________ percent.

Q.26

Pick out the wrong statement

Low ozone layer thickness in polar regions is due to cold climatic conditions
Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine
Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine
Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing minamate disease

Q.27

High noise level in a chemical plant can be controlled by the

Suppression of noise at the source itself
Path control of noise
Protection of operating personnel
All of the above

Q.28

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?

CO₂
H₂
SO₃
N₂

Q.29

Aerosols present in atmospheric air may be

Positively charged
Negatively charged
Neutral
Combination of all A, B & C

Q.30

In the context of the chemical process industries, the term BOD is normally associated with the

Characterisation of solid wastes
Organic concentration in gaseous effluents
Characterisation of liquid effluents
Characterisation of boiler feed water

Photochemical smog is formed from automobile exhaust

Smog is

Smoke is produced due to

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

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

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

The progressive warming up of the earth's surface is mainly due to the

Pick out the wrong statement.

Fresh domestic sewage is __________ in color.

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

What are the methods of treatment & disposal of radioactive wastes?

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

__________ can not control the noise pollution.

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Reinglemann chart is used for the measurement of the

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

Carbonaceous particles having size less than 1 μm are called

Pick out the wrong statement.

Workers working in __________ industry are most prone to white lung cancer.

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

Polyvinyl chloride containers are not suitable for storing

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Growth of __________ is promoted by the presence of manganese in water.

Deaeration of high pressure boiler feed water is done to reduce

Salt content in sea water is about __________ percent.

Pick out the wrong statement

High noise level in a chemical plant can be controlled by the

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?

Aerosols present in atmospheric air may be

In the context of the chemical process industries, the term BOD is normally associated with the

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