Laboratory Analysis

Question 1

What test is done by a laboratory to determine data quality?

a. Performance evaluation
b. Spiked samples to test
c. Quality control test
d. Both b and c

Answer 1

Both b and c

Spiked samples to test and Quality control test

Question 2

A beaker is primarily used for _____?
a. Mixing chemicals
b. Titrations
c. Accurately measuring liquid chemicals
d. Reaction vessel and jar testing

Answer 2

Mixing chemicals

Titrations, Accurately measuring liquid chemicals, Reaction vessel and jar testing

Question 3

The Curie unit is the activity of 1 g of __ ___ or __ ___ disintegrations per second?

a. Uranium, 3.2 x 1010
b. Uranium, 3.7 x 109
c. Radium, 3.7 x 1010
d. Radium, 3.2 x 109

Answer 3

Radium, 3.7 x 10 TO THE 10TH

Uranium, 3.2 x 1010 and Uranium, 3.7 x 109

Question 4

What is the primary constituent of the pH-causing ions in a water sample if the pH is above 10?
a. HCO3-1
b. OH-1
c. CO2
d. CO2-3

Answer 4

OH-1

Question 5

Coliform bacteria will produce gas in ____ broth at _____ within _____?

a. Lactose or brilliant bile tryptose, 35 ֯C, 24 – 48 hours
b. Lactose or brilliant bile tryptose, 35 ֯C, 48 – 72 hours
c. Lactose or lauryl tryptose, 35.5 ֯C, 24 – 48 hours
d. Lactose or lauryl tryptose, 35.5 ֯C, 18 – 24 hours

Answer 5

c. Lactose or lauryl tryptose, 35.5 ֯C, 24 – 48 hours

Question 6

The number of samples under the Total Coliform Rule that a water system must collect depends on the _____?

a. Number of connections
b. Number of customers that it serves
c. Amount of water produced
d. Size of distribution

Answer 6

b. Number of customers that it serves

Number of customers that it serves, Amount of water produced, Size of distribution

Question 7

Phenolphthalein acidity is the same as _____?

Answer 7

CO3

Question 8

Drinking water samples to be tested for total coliforms should be tested the same day they are collected, but they can be refrigerated for _____ before analysis?

Answer 8

8 hours

Question 9

What type of laboratory equipment is highly resistant to heat, sudden temperature changes, and chemical attack?
a. Pyrex equipment
b. Kimax
c. Porcelain dishes
d. Beakers

Answer 9

Pyrex equipment

Question 10

Two metals that are typically toxic are _____, and two metals that are not normally toxic are _____?
a. Chromium and cadmium, manganese and iron
b. Cadmium and manganese, chromium and iron
c. Cadmium and iron, chromium and manganese
d. Chromium and manganese, cadmium and iron

Answer 10

Chromium and cadmium, manganese and iron

Question 11

11. Total hardness and total alkalinity of water are used to calculate the __ ___.
    a. Langelier Saturation Index (LSI)
    b. Hydroxide, carbonate and bicarbonate hardness
    c. Lime – soda ash dosage
    d. Carbonate and noncarbonate hardness

Answer 11

d. Carbonate and noncarbonate hardness

Question 12

What group of organisms are measured that, if present, might indicate the presence of pathogens?
a. Cryptosporidium oocysts
b. Coliform bacteria
c. Bacilli bacteria
d. Lactobacillus bacteria

Answer 12

b. Coliform bacteria

Question 13

Alkalinity is defined as __ ___.
a. The quantity of CaCO3 and noncarbonate hardness that is in the water
b. The quantity of CaCO3 and MgCO3 that is in the water
c. A measurement of the water’s capacity to neutralize an acid
d. A measurement of the water’s capacity to neutralize an acid to a pH of 4.8

Answer 13

c. A measurement of the water’s capacity to neutralize an acid

Question 14

What should be done with the lid while collecting a bacteriological sample?
a. Place the lid with the threads facing down on a clean surface, such as a paper towel
b. Set the lid up on a clean surface
c. Hold the cap, threads down, while collecting the sample with the other hand
d. Put the cap in your pocket so it is not dropped and contaminated

Answer 14

c. Hold the cap, threads down, while collecting the sample with the other hand

Question 15

The zeta potential is defined as a force that will keep _____ apart and keep them suspended.
a. Salts
b. Ionic molecules
c. Very small clay particles
d. Very small colloidal particles

Answer 15

d. Very small colloidal particles

Question 16

SUVA is in indicator of what disinfection byproduct precursor substance?
a. Inorganic and organic content
b. Humic content
c. Fulvic content
d. Protein content

Answer 16

b. Humic content

Question 17

Sampling of organic compounds must be done with ultraclean glass vials that have lids made of _____.
a. Polypropylene
b. Polytetrafluoroethylene
c. High-density polyethylene
d. Polychlorinated biphenyl

Answer 17

b. Polytetrafluoroethylene

Question 18

The best place to collect samples at water treatment plants would most probably be __ ___.
a. Immediately downstream of chemical addition
b. Worst-case points, such as near settled debris or algae mats
c. From the main stream flow
d. Near calm water to avoid excessive turbulence

Answer 18

c. From the main stream flow

Question 19

What are the chemical formula precipitates when chlorine is added to water containing iron and manganese?
a. Fe(OH)2 and MnO
b. Fe(OH)3 and MnO2
c. Fe(OH)2 and MnO2
d. Fe(OH)3 and MnO

Answer 19

b. Fe(OH)3 and MnO2

Question 20

The saturation point of a chemical in water varies with _____.
a. pH
b. Total Dissolved Solids (TDS)
c. Temperature
d. All of the above

Answer 20

d. All of the above

Question 21

Why is it important to label the contents of all containers that carry materials or solutions in a water plant?
a. To prevent mixing of two incompatible materials
b. To prevent unwanted reactions affecting health and safety
c. To prevent losing a sample
d. All of the above

Answer 21

d. All of the above

Question 22

The amount of oxygen that can remain dissolved in water is a function of the water’s _ ____, and the __ ___ the water, the __ ___ the possible concentration of dissolved oxygen.
a. pH, colder, lower
b. pH, higher, higher
c. Temperature, colder, higher
d. Temperature, higher, higher

Answer 22

c. Temperature, colder, higher

Question 23

The precise location of sampling points depends on the _____ the distribution system.
a. Configuration of
b. Size and volume of
c. Pipe materials in
d. Contamination history within

Answer 23

a. Configuration of

Question 24

In order to test a laboratory and an analyst, the oversight agency gives the laboratory and analyst a _____ test.
a. Quality assurance
b. Quality control
c. Set of blind standards
d. Performance evaluation

Answer 24

c. Set of blind standards

Question 25

A virus would be considered a _____. a. Dissolved solid b. Colloidal solid c. Biological solid d. Both b and c

Answer 25

d. Both b and c

Question 26

Customer complaints of __ ___ are often caused by a _ ____. a. Taste, odor, and color; home treatment device b. Taste, odor, and color; water softener or water heater c. Pink color on bathroom fixtures, water softener of home water treatment device d. Pink color on bathroom fixtures, water heater

Answer 26

b. Taste, odor, and color; water softener or water heater

Question 27

What are the additives in detergent that tie up hardness ions? a. Cationic and anionic fatty acids b. Fatty lipids c. Sequestering agents d. Calcium or magnesium salts of fatty acids

Answer 27

c. Sequestering agents

Question 28

What rule requires the measurement of conductivity? a. Wastewater Reclamation Rule b. Arsenic Rule c. Lead and Copper Rule d. Stage 2 Disinfectants and Disinfection Byproducts Rule

Answer 28

c. Lead and Copper Rule

Question 29

Any good _ ____ household detergent is adequate for cleaning labware, and it is preferred that the detergent be of a __ ___ type. a. Non-phosphate, nonliquid b. Non-phosphate, liquid c. Phosphate, nonliquid d. Phosphate, liquid

Answer 29

b. Non-phosphate, liquid

Question 30

Raw water temperature should be measured at a minimum of _____. a. Every 4 hours b. Every 8 hours c. Every 12 hours d. Every 24 hours

Answer 30

d. Every 24 hours

Question 31

Find the amount of iron (Fe) removed per year from a plant that treats an average of 17.2 MGD, if the average raw water iron concentration is 0.46 mg/L and the removal efficiency is 82%. Round to the most appropriate answer. a. 19,000 lb/yr of Fe removed b. 20,000 lb/yr of Fe removed c. 21,000 lb/yr of Fe removed d. 23,200 lb/yr of Fe removed

Answer 31

b. 20,000 lb/yr of Fe removed

Question 32

If a treatment plant softens its water, where should samples be collected to determine whether the desired degree of softening has been achieved? a. Before the clearwell b. After the clearwell c. Immediately after softening and before the clearwell d. Immediately after softening and before the filters

Answer 32

b. After the clearwell

Question 33

As this parameter increases, corrosion decreases. a. Dissolved Oxygen (DO) b. Total Dissolved Solids (TDS) c. Temperature d. Alkalinity

Answer 33

Alkalinity

Question 34

What Threshold Odor Number (TON), also the USEPA secondary MCL, will begin to draw complaints from customers? a. 3 TON b. 4 TON c. 5 TON d. 6 TON

Answer 34

a. 3 TON

Question 35

The turbidity reading from a meter at a water plant’s clearwell is reading a zero immediately to the right of the decimal point, and the next three numbers to the right of the zero are 435. What should the operator record, if three digits to the right of the decimal are needed? a. .043 b. 0.043 c. .044 d. 0.044

Answer 35

d. 0.044

Question 36

Samples should not be collected from __ ___ or _ ____. a. Chrome-plated, copper alloy pipe b. Chrome-plated, CPVC c. Sill cocks, faucets with hose threads d. Sill cocks, most plastic materials

Answer 36

c. Sill cocks, faucets with hose threads