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IE 4151 Final Quiz 2

Total questions: 80

Worksheet time: 40mins

Name
Class
Date
1.
Which of the following is not a natural source of pollutants in surface waters?
a)
Soil Erosion
b)

Natural decomposition

c)
Industrial discharge
d)
Leaching from land
2.
The self-purification capacity of water bodies was first exceeded in:
a)
Oceans
b)
Smaller streams
c)
Groundwater aquifers
d)
Reservoirs
3.
Assimilative capacity refers to:
a)
The maximum dilution rate of a stream
b)
The amount of contaminant load a water body can handle without exceeding quality guidelines
c)
The sedimentation rate of solids
d)
The filtration efficiency of aquifers
4.
Which process was historically considered “the solution to pollution”?
a)
Sedimentation
b)
Dilution
c)
Filtration
d)
Gas transfer
5.
The dilution equation is:
a)
CsQs + CwQw = CmQm
b)
Q = V/t
c)
Vo = Q/A
d)
Vp > Vo
6.
Suspended solids primarily affect:
a)
Photosynthesis and aquatic feeding
b)
Gas solubility
c)
Heat transfer
d)
Chlorine demand
7.
Resuspension of solids occurs mainly during:
a)
Sedimentation
b)
Flooding or heavy runoff
c)
Filtration
d)
Dilution
8.
Filtration in aquifers is most effective when:
a)
Soil layers are shallow and coarse
b)
Soil layers are deep and fine
c)
Water is turbulent
d)
Temperature is high
9.
Gas transfer replenishes oxygen lost due to:
a)
Photosynthesis
b)
Bacterial degradation of organic waste
c)
Sedimentation
d)
Dilution
10.
Heat transfer in water bodies is influenced by:
a)
Channel depth and width
b)
Atmospheric pressure
c)
Chlorine concentration
d)
Sediment density
11.
Which chemical process stabilizes pH in streams?
a)
Oxidation-reduction
b)
Dissolution-precipitation
c)
Buffering by bicarbonate (HCO3-)
d)
Gas transfer
12.
Catabolism provides:
a)
Energy for cell synthesis and maintenance
b)
Materials for cell growth
c)
Stored food for survival
d)
Oxygen for respiration
13.
Endogenous catabolism occurs when:
a)
External food sources are abundant
b)
Organisms use stored food for maintenance
c)
Oxygen is plentiful
d)
Sedimentation is complete
14.
Autotrophic bacteria derive energy and materials from:
a)
Organic sources
b)
Inorganic sources
c)
Sunlight only
d)
Sediments
15.
Facultative heterotrophs function as:
a)
Aerobes only
b)
Anaerobes only
c)
Aerobes in presence of O2, anaerobes in absence of O2
d)
Phototrophs
16.
Algae metabolize waste products of:
a)
Autotrophs
b)
Heterotrophic bacteria
c)
Protozoa
d)
Rotifers
17.
Protozoa reproduce by:
a)
Binary fission
b)
Budding
c)
Spore formation
d)
Fragmentation
18.
Sediments can cause anaerobic conditions leading to:
a)
Oxygen replenishment
b)
Release of soluble compounds
c)
Increased photosynthesis
d)
Chlorine demand
19.
Filtration by streambeds involves:
a)
Pebbles and rocks trapping particles
b)
Chlorine neutralization
c)
Gas transfer
d)
Heat exchange
20.
Which factor does not influence natural purification?
a)
Hydraulic characteristics
b)
Sunlight variation
c)
Chlorine dosage
d)
Temperature
21.
Which organisms are primary decomposers of organic material?
a)
Algae
b)
Protozoa
c)
Bacteria
d)
Rotifers
22.
Phototrophs obtain energy from:
a)
Organic matter
b)
Sunlight
c)
Sediments
d)
Chlorine
23.
Sedimentation drawbacks include:
a)
Increased reservoir capacity
b)
Development of anaerobic conditions
c)
Enhanced navigation
d)
Reduced flooding
24.
Gas solubility in water depends on:
a)
Particle size
b)
Transfer rate and solubility
c)
Sediment density
d)
Chlorine residual
25.
Heat transfer in water is generally:
a)
Rapid and unstable
b)
Slow and gradual
c)
Instantaneous
d)
Negligible
26.
Which chemical is commonly used for coagulation in water treatment?
a)
Sodium chloride
b)
Alum (aluminum sulfate)
c)
Calcium carbonate
d)
Chlorine dioxide
27.
Coagulation destabilizes colloids by:
a)
Charge neutralization and interparticle bridging
b)
Sedimentation
c)
Filtration
d)
Gas transfer
28.
Flocculation refers to:
a)
Chemical destabilization of colloids
b)
Physical combination of coagulated particles into flocs
c)
Chlorine disinfection
d)
Filtration through sand
29.
The jar test is used to:
a)
Measure chlorine demand
b)
Optimize coagulant dosage
c)
Calculate overflow rate
d)
Determine sedimentation velocity
30.
Sedimentation tanks remove flocs by:
a)
Gravity settling
b)
Chlorine oxidation
c)
Filtration
d)
Gas transfer
31.
Sludge in settling tanks is mainly:
a)
Biodegradable organics
b)
Aluminum hydroxides, calcium carbonates, clays
c)
Pathogens
d)
Chlorine residuals
32.
Overflow rate is defined as:
a)
Q/A
b)
V/t
c)
CsQs + CwQw
d)
Vp/Vo
33.
Residence time in a tank is:
a)
V/Q
b)
Q/A
c)
Vp > Vo
d)
CsQs + CwQw
34.
Rapid sand filters require:
a)
Backwashing to clean clogged sand
b)
Chlorine addition
c)
Sedimentation
d)
Gas transfer
35.
Activated carbon filters are used to:
a)
Remove dissolved organics and odors
b)
Neutralize charges
c)
Increase chlorine residual
d)
Reduce temperature
36.
The most common disinfectant in water treatment is:
a)
Ozone
b)
Chlorine
c)
UV light
d)
Hydrogen peroxide
37.
Chlorine residual ensures:
a)
Pathogens remain in water
b)
No further organisms remain to be oxidized
c)
Sedimentation is complete
d)
Filtration efficiency is high
38.
Typical chlorine dosage is:
a)
1 mg/L
b)
2 mg/L
c)
5 mg/L added, 2 mg/L residual
d)
10 mg/L
39.
A drawback of chlorination is:
a)
Formation of trihalomethanes (THMs)
b)
Increased turbidity
c)
Reduced sedimentation
d)
Lower pH buffering
40.
Chlorine dioxide has oxidizing power:
a)
Equal to chlorine
b)
25 times greater than chlorine
c)
Less than chlorine
d)
Negligible
41.
Chlorine dioxide drawbacks include:
a)
Formation of toxic chlorite and chlorate
b)
THM formation
c)
High turbidity
d)
Sediment resuspension
42.
Ozone disinfection is:
a)
Cheap and stable
b)
Expensive and highly reactive
c)
Ineffective against pathogens
d)
Used only in sedimentation
43.
Flow-through velocity in sedimentation tanks is related to:
a)
Overflow rate
b)
Chlorine demand
c)
Filtration efficiency
d)
Heat transfer
44.
Sludge underflow concentration in a sedimentation tank is typically:
a)
Higher than overflow concentration
b)
Lower than overflow concentration
c)
Equal to overflow concentration
d)
Independent of overflow concentration
45.
The purpose of backwashing in rapid sand filters is to:
a)
Increase chlorine residual
b)
Remove trapped suspended solids from the filter media
c)
Neutralize colloidal charges
d)
Reduce water temperature
46.
Which disinfectant has the advantage of not forming trihalomethanes (THMs) but may produce toxic chlorite and chlorate?
a)
Chlorine
b)
Chlorine dioxide
c)
Ozone
d)
UV light
47.
Ozone disinfection requires:
a)
Corrosion-resistant materials such as stainless steel
b)
High turbidity levels
c)
Low sedimentation rates
d)
Residual chlorine monitoring
48.
In sedimentation tanks, 100% particle removal can be expected when:
a)
Overflow rate exceeds particle velocity
b)
Particle settling velocity (Vp) is greater than critical velocity (Vo)
c)
Chlorine residual is above 2 mg/L
d)
Filtration media is activated carbon
49.
Which of the following is a physical purification process in natural water systems?
a)
Oxidation-reduction
b)
Sedimentation
c)
Catabolism
d)
Photosynthesis
50.
The phrase “solution to pollution is dilution” reflects reliance on:
a)
Sedimentation
b)
Dilution capacity of streams
c)
Filtration
d)
Gas transfer
51.
Which factor does not influence sedimentation efficiency?
a)
Particle size
b)
Particle density
c)
Fluid viscosity
d)
Chlorine dosage
52.

What role did natural purification processes play in surface water quality?

a)

They increased the amount of pollutants.

b)

They removed or rendered impurities harmless.

c)

They added new pollutants to the water.

d)

They prevented human activity from affecting watercourses.

53.

Which of the following is an example of human settlements contributing to water pollution?

a)

Forests

b)

Villages

c)

Mountains

d)

Deserts

54.

What is the primary cause of pollution in water bodies?

a)

Excessive waste products exceeding the self-purification capacity.

b)

Natural disasters affecting water bodies.

c)

Lack of water flow in streams and lakes.

d)

Overuse of water resources by humans.

55.

What is the primary goal of pollution control programs initiated in recent decades?

a)

To increase the amount of contaminants discharged into water bodies

b)

To reduce contaminants discharged to a level that natural purification processes can assimilate

c)

To eliminate all contaminants from water bodies

d)

To replace natural purification processes with artificial ones

56.

How does temperature affect the natural purification process?

a)

It has no effect on the process

b)

It influences the speed and completeness of the process

c)

It only affects the chemical nature of water

d)

It impacts hydraulic characteristics exclusively

57.

Why is a thorough knowledge of natural purification processes essential?

a)

To understand the assimilative capacity of surface waters and the operations of engineered systems

b)

To measure the temperature of water systems

c)

To calculate the speed of water flow in rivers

d)

To determine the color of water in lakes

58.

What is a key factor for the success of dilution as a self-cleaning mechanism for surface water?

a)

Discharging small quantities of waste into large bodies of water

b)

Using advanced filtration systems

c)

Increasing the population density

d)

Treating wastewater with chemicals

59.

Why does growth in population and industrial activity challenge the use of dilution for wastewater disposal?

a)

It increases water demand and wastewater quantities

b)

It reduces the availability of filtration systems

c)

It eliminates the need for wastewater disposal

d)

It improves the efficiency of dilution

60.

What principle is used to calculate the dilution capacity of a stream?

a)

Conservation of energy.

b)

Mass balance.

c)

Thermodynamics.

d)

Fluid dynamics.

61.

What does C represent in the formula CsQs + CwQw = CmQm?

a)

Volumetric flowrate (volume/time).

b)

Concentration of selected material (mass/volume).

c)

Dilution capacity.

d)

Waste discharge rate.

62.

What is one of the effects of suspended solids in water on aquatic plants?

a)

Increase photosynthetic activity

b)

Reduce light penetration

c)

Enhance vision of aquatic animals

d)

Improve feeding of aquatic animals

63.

Which of the following is a consequence of suspended solids on aquatic animals that feed through filtration?

a)

Improved feeding efficiency

b)

Interference with feeding

c)

Enhanced filtration process

d)

Increased vision clarity

64.

What is a drawback of natural sedimentation?

a)

It increases the oxygen levels in water

b)

It creates anaerobic conditions in sediments, leading to decomposition of organics

c)

It prevents the release of soluble compounds into the stream

d)

It enhances the reproduction of aquatic organisms

65.

What is sedimentation in nature primarily used for?

a)

Removing suspended particles from a watercourse

b)

Increasing the flow rate of water

c)

Enhancing the growth of aquatic organisms

d)

Preventing flooding in harbors

66.

What is a characteristic of regions that require water treatment before distribution?

a)

Regions with low population density

b)

Regions with dense populations or heavily agricultural areas

c)

Regions with abundant natural water sources

d)

Regions with high industrial activity

67.

What is a typical water treatment plant made up of?

a)

A single reactor or unit operation

b)

Series of reactors or unit operations

c)

Randomly arranged operations

d)

A single operation with no flow between units

68.

Why is the order of operations in a water treatment plant important?

a)

It ensures water flows faster

b)

It achieves a desired end product

c)

It reduces the number of operations needed

d)

It eliminates the need for reactors

69.

Which step in the water treatment process involves the removal of sludge?

a)

Rapid sand filter.

b)

Settling tank.

c)

Clean water storage basin.

d)

Pump for water distribution.

70.

What is the purpose of the flocculation tank in the water treatment process?

a)

To store water for distribution

b)

To remove large particles from water

c)

To mix coagulants with water to form flocs

d)

To disinfect water before storage

71.

What is the primary purpose of adding alum (aluminum sulfate) to water in the first stage of the process?

a)

To increase the water temperature

b)

To neutralize the charge on the particles

c)

To add color to the water

d)

To remove dissolved gases

72.

What is the primary purpose of the chemical mixing basin in the water treatment process?

a)

To disinfect water with chlorine

b)

To mix chemicals for coagulation

c)

To filter water using sand

d)

To store clean water

73.

What does coagulation involve in terms of colloidal particles?

a)

Stabilization of colloids.

b)

Destabilization of colloids.

c)

Dissolution of colloids.

d)

Separation of colloids.

74.

What is the primary purpose of adding a coagulant to a liquid containing impurities?

a)

To dissolve impurities completely

b)

To trap impurities in a precipitate

c)

To increase the temperature of the liquid

d)

To change the color of the liquid

75.

What is the charge of aluminum ions in aluminum sulfate used in coagulation?

a)

Neutral

b)

Positively charged

c)

Negatively charged

d)

Magnetically charged

76.

What happens to particles in water due to their negative charge?

a)

They clump together.

b)

They stay dispersed and dissolved.

c)

They sink to the bottom.

d)

They form a solid layer.

77.

Which term best describes the state of particles in water when they repel each other due to their negative charge?

a)

Solidification

b)

Colloidal

c)

Precipitation

d)

Evaporation

78.

Why is there a need to raise the pH during interparticle bridging?

a)

To dissolve calcium carbonate

b)

To make aluminum hydroxide soluble

c)

To precipitate aluminum hydroxide

d)

To increase the size of colloidal particles

79.

What assists in settling during interparticle bridging?

a)

Dissolved aluminum hydroxide

b)

Precipitated calcium carbonate

c)

Dissolved calcium hydroxide

d)

Reduced pH levels

80.

What is the term used to describe the group of particles that settle out of water after joining together?

a)

Sediment

b)

Floc

c)

Cluster

d)

Aggregate

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