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Analytical Chemistry Flashcards

1
Q

A type of analysis in terms of sample size that can resolve fine-scale variations in chemical elements, as well as determine the presence and distribution of different phases in materials.
A. Macro
B. Semi-macro
C. Micro
D. Ultra-micro

A

C

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2
Q

An analyst determines that the analytical balance he used in a given analytical test is wrongly calibrated. Determine what type of error is represented.
A. Systematic error
B. Random error
C. Gross error
D. Cannot be determined

A

A

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3
Q

The dynamic range in analytical measurement refers to the range where ______
A. the detection limit lies
B. the instrument reading is constant
C. the sensitivity of the instrument is highest
D. instrument reading linear to the input value

A

A

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4
Q

It is a non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used.
A. Measurement uncertainty
B. Accuracy
C. Error
D. Precision

A

A

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5
Q

The maximum holding time for acid preserved samples that will be subjected to determination of metals is _____
A. 48 hours
B. 3 months
C. 6 months
D. 1 week

A

C

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6
Q

Glass container is NOT suitable for
A. oil and grease determination
B. microbiological analyses
C. all of the choices
D. inorganic trace analyses

A

D

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7
Q

The main ISO Standard used by testing and calibration laboratories to gain accreditation and formal of their competence to carry out tests and/or calibrations, including sampling.
A. ISO/IEC 17025
B. EURACHEM
C. AOAC
D. ISO 9000:2000

A

A

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8
Q

According to Revised DA 04-36, the appropriate waste labels shall Include
A. Generator ID Number
B. Volume of Waste
C. Container Material
D. All of the above

A

D

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9
Q

Which of the following is NOT a proper laboratory practice?
A. wearing of masks and gloves
B. drying of glassware after washing
C. tying or braiding long hairs
D. adding water to strong acid

A

D

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10
Q

Which of the following is the most appropriate container for hexane?
A. glass bottle
B. amber bottle
C. plastic bottle
D. none

A

B

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11
Q

Minimum concentration of a substance that can be measured and reported with confidence at the analyte concentration is greater than zero refers to
A. Lower Warning Limit
B. Method Detection Limit
C. Control Limit
D. Limit of Quantitation

A

B

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12
Q

The fire triangle consists of which of the following?
A. oxygen, heat, material are
B. air, heat, fire
C. air, fuel, spark
D. oxygen, heat, fuel

A

D

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13
Q

Which is TRUE about laboratory hoods?
A. Provides further protection by diluting low of flammable gases below explosion limits.
B. It protects you from being exposed in chemical fume,
C. Must always be on
D. All of the above.

A

D

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14
Q

Which of the following focuses on Quality Management Systems?
A. ISO 9001
B. ISO 17025
C. ISO 15189
D. GLP

A

A

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15
Q

There is a definite correlation between orderliness and level of safety in the laboratory. In addition, a disorderly laboratory can hinder or endanger emergency response personnel. Which of the following housekeeping rules should NOT be adhered to?
A. Never obstruct access to exits and emergency equipment.
B. Properly label and store all chemicals.
C. Store chemical containers on the floor
D. Clean work areas, including floors, regularly.

A

C

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16
Q

Consider that you are working with vitamin C table production, to which standard’s should your quality management should subscribe?
A. GMP
B. HACCP
C. ISO 9001:2008
D. All of the above

A

D

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17
Q

Sampling type that eliminates questions of bias in selection.
A. composite
B. Stratified
C. Systematic
D. Random

A

D

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18
Q

This system is used in the food industry to identify and control potential hazards (i.e. biological, chemical, and physical) that could compromise food safety.
A. GLP
B. GMP
C. HACCP
D. ISO 9001

A

C

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19
Q

First consideration for chemical storage shall be based on its ______
A. frequency of usage
B. compatibility with other chemicals
C. size of container
D. alphabetical order

A

B

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20
Q

In labeling commercially packaged chemicals, the following are correct EXCEPT
A. The label usually includes the name of the chemical and any necessary handling and hazard information.
B. The label includes the CAS registry number to avoid ambiguity about cherical names
C. The label is supplemented by the date received.
D. Replace the existing labels on incoming containers of chemicals and other materials to avoid confusion.

A

D

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21
Q

Waste is __________
A. a material that has no intended use or reuse
B. material that has a lapsed expiration date
C. any material that has been processed
D. a material that has no current use

A

A

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22
Q

The total error of an analytical result is the sum of ______
A. sampling
B. sample preparation
C. analytical errors
D. all of the above

A

D

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23
Q

Process by which a sample population is reduced in size to an amount of homogeneous material that can be conveniently handled in the lab in which the composition is representative of the population.
A. Selection
B. Monitoring
C. Sampling
D. Segregation

A

C

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24
Q

The method of standardization can be used if a _____ reacts quantitatively with the reagent needed in the standard solution
A. primary standard
B. secondary standard
C. working standard
D. intermediate solution

A

A

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25
Q

During acid spills, which of the following can be applied to the spill before treating it with adsorbent material?
A. Sodium bicarbonate
B. Water
C. Acetic acid
D. Sodium bisulfite

A

A

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26
Q

These are any waste materials that can be retrieved from the waste stream and free from contamination that can still be converted into suitable beneficial use.
A. Recyclable wastes
B. Residual wastes
C. Compostable wastes
D. Special wastes

A

A

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27
Q

Symbols indicated in waste labels that instantly identify the kind of hard the chemical possesses.
A. Signal words
B. Pictograms
C. Precautionary statements
D. Hazard statements

A

B

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28
Q

It describes the policies and procedures the laboratory has to manage in relation to quality, or references where those procedures can be found. An essential requirement of ISO 9000 series of standards and ISO 17025.
A. Quality Assurance
B. Quality Control
C. Quality Manual
D. Documentation

A

C

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29
Q

Which of the following statements best describes a primary-method?
I. Set of instructions about how to carry out a method issued by a national standards body.
II. It has the highest metrological qualities.
Ill. Method that employs the use of materials such as certified reference materials.
IV. Titration of hydrochloric acid with anhydrous sodium carbonate to determine the concentration of the acid is an example of this method.
A. I
B. II
C. II & IV
D. I & IV

A

C

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30
Q

It is the fraction of the named material present in the stated chemical form.
A. Potency
B. Purity
C. Stability
D. Activity

A

B

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31
Q

If you reported that a sample with 9 mg/L of a substance has only 5 mg/L and the acceptable limit according to standard is 7 mg/L, this is _____
A. false positive
B. false negative
C. accurate
D. precise

A

B

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32
Q

It is a performance parameter that could be used to analyze a blank sample matrix.
A. Bias estimate
B. Selectivity
C. Limit of quantification
D. Limit of detection

A

D

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33
Q

Which of the following factors affects the choice of analytical methods?
A. The type of analysis required
B. The accuracy required
C. Possible interferences from components of the material other than those of interest.
D. All of the above

A

D

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34
Q

Which chemical grade is commonly used for low-grade applications such as cleaning and qualitative testing?
A. USP Grade
B. NF Grade
C. Technical Grade
D. Laboratory Grade

A

C

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35
Q

Consider the analysis of the determination of sugar concentration in powdered juice dissolved in water. Which of the following is the matrix?
A. Sugar
B. Powdered juice
C. Water
D. B and C

A

D

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36
Q

Which of the following statement(s) is(are) TRUE about instrumental background signal?
I. Even when no sample is being analyzed, the instrument will generate a background signal.
II. LOD for an instrument improves if the S/N can be increased.
III. LOD for an instrument is not affected by S/N.
A. I
B. l and Il
C. l and Ill
D. I, ll, and Ill

A

B

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37
Q

The portion of the calibration curve which includes the range of concentrations of analyte that can be determined with demonstrated precision, accuracy, and response function.
A. Limit of Detection
B. Limit of Quantitation
C. Working range
D. Linear dynamic range

A

C

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38
Q

The property of an analytical method to determine simultaneously several components independently from each other.
A. Selectivity
B. Specificity
C. Sensitivity
D. Ruggedness

A

A

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39
Q

It is a part of quality systems that is officially defined by the ISO as the assembly of all planned and systematic actions to provide adequate confidence that a product, proves or service will satisfy the given quality requirements.
A. Quality Management
B. Quality Assurance
C. Quality Control
D. Quality Manual

A

B

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40
Q

This quality system standard is a general requirement for the competence of testing and calibration laboratories.
A. GLP
B. GMP
C. ISO 9001
D. ISO/IEC 17025

A

D

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41
Q

If you are going to mass produce vitamin C, which standard should you subscribe in?
A. GMP
B. HACCP
C. ISO 9001
D. All

A

D

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42
Q

Which is/are true about Quality Assurance?
I. Quality Assurance is a set of activities for ensuring quality in the process by which products are developed.
II. Quality Assurance is a corrective tool and product oriented.
A. I only
B. Il only
C. Both I and Il
D. None of these

A

A

43
Q

A drug sample contains 10.0 pg/L of its active ingredient. A 5.0 pg/L of spike was added to a replicate portion of the drug. The spiked sample gave a concentration of 14.6 pg/L. What is the %recovery of the spike?
A. 34
B. 96
C. 37
D. 92

A

D

44
Q

Which of the following observation(s) will require a process to stop immediately?
I. Results lie outside action limits
II. Three consecutive measurements on one side of the central limit
Ill. Seven consecutive measurements create an increasing trend
IV. A measurement is within warning limits
A. I only
B. I and Ill
C. I, ll, and IV
D. I, Ill, and IV

A

B

45
Q

When a deviation from critical limits happens, what should be done?
A. Documentation of corrective actions
B. Stop the process and inform the supervisor
C. Reassess the standards being implemented
D. All

A

D

46
Q

A type of blank that is commonly used with techniques such as spectrophotometry to zero the instrument before measuring test samples and other blanks.
A. Reagent blank
B. Method blank
C. Trip blank
D. Field blank

A

A

47
Q

Which of the following are characteristics of a QC sample?
A. Similar in composition to the types of samples normally examined
B. Must be stable
C. Must be available in large quantities
D. All of these

A

D

48
Q

A reactive part of the quality management system that is concerned on the quality of the product, especially those materials that are soon to be released to the customer.
A. Quality Assurance
B. Quality Control
C. Quality Audit
D. Quality Evaluation

A

B

49
Q

When exposure to hazards cannot be engineered completely out of normal operations and admin controls are deemed ineffective, this supplementary method of control can be used.
A. Elimination
B. Substitution
C. Administrative control
D. Use of PPE

A

D

50
Q

The area around surrounding a safety shower/eyewash
A. can be used to store boxes if they can be removed quickly
B. must remain clear of all items at all items
C. is typically marked with yellow and black floor tape as a reminder to keep it clear
D. Both B and C

A

D

51
Q

Laboratory chemical hoods are best placed in a location that is _______
A. near the aisle for ease of access.
B. near the windows and doors
C. away from air diffuser
D.None of these

A

C

52
Q

Which of the following statement(s) is(are) GOOD practices when using lab chemical hood?
I. Place chemical sources and apparatus at least 6 cm behind the face.
Il. Scrubbers must be installed especially when the lab is dealing with highly toxic vapors.
Ill. Avoid opening and closing the sash rapidly.
IV. Store odoriferous materials inside the chemical hood to prevent personnel from inhaling the toxic vapors.
A. I and Il
B. I-III
C. I, Ill, and IV
D. ll and Ill

A

D

53
Q

The white section of the NFPA diagram corresponds to the special hazard of the material. Which of the following is NOT considered as “special hazard”?
A. Acid (ACID)
B. Corrosive (COR)
C. Explosive (EXP)
D. Radioactive ☢️

A

C

54
Q

Concentrated hydrochloric acid is a highly corrosive material. It is expected that its container contains the following GHS label(s).
I. Flame with ring
II. ❗️
III. Test tube spilling on hand and surface
IV. ☠️
A. I
B. II
C. II & III
D. III & IV

A

C

55
Q

Which of the following is NOT a GHS pictogram?
A. Exploding bomb
B. Gas tank
C. Skull and crossbones
D. Health hazard

A

B

56
Q

The following information can be found in a safety data sheet EXCEPT _______
A. Manufacturer name
B. Manufacturer contact details
C. Require PPEs
D. None of the choices

A

D

57
Q

The SDS of certain chemical contains the given pictogram [blue: 1, red: 4, yellow: 2, white: W with strike through]. Determine the corresponding hazards related to the material.
A. Health: Normal material; Fire: Above 200°F; Reactivity: Violent chemical change; Specific hazard: Alkaline
B. Health: Slightly hazardous; Fire: Below 100°F; Reactivity: Unstable if heated; Specific hazard: Oxidizer
C. Health: Slightly hazardous; Fire: Below 73°F; Reactivity: Violent chemical change; Specific hazard: Reacts violently with water
D. Health: Hazardous; Fire: Below 100°F; Reactivity: Unstable if heated; Specific hazard: Reacts violently with water

A

C

58
Q

How long should you rinse the affected area in an eyewash during accidental chemical splashes on the eyes?
A. 5 mins
B. 10 mins
C. 15 mins
D. 30 seconds

A

C

59
Q

Common hazards posed by different chemicals in the laboratories can be found at _______
A. CHP
B. SDS
C. GHS labels
D. All of these

A

D

60
Q

At this concentration, the mixture of flammable liquids is considered too “lean” to burn.
A. at lower explosion limit
B. below lower explosion limit
C. above upper explosion limit
D. between upper and lower explosion limit

A

B

61
Q

According to the Department of Trade and Industry-Bureau of Philippine Standards (DTI-BPS), what color designations correspond to a foam type fire extinguisher?
A. red body, white band
B. red body, black band
C. red body, blue band
D light green body, white band

A

C

62
Q

The fire extinguisher with red body & blue band is most appropriately used for which type of fire?
A. Fires involving ordinary combustible materials
B. surface fire
C. electrical fire
D. Both A and B

A

D

63
Q

This general type of reaction results in sudden rapid rise in temperature upon heating of the material that usually becomes violent.
A. vigorous reaction
B. combustion reaction
C. runaway reaction
D. reaction under pressure

A

C

64
Q

Which of the following functional groups pose explosion hazards?
I. Azide
Il. Peroxide
Ill. Thiol
IV. Hydrocarbons
A. I & II
B. ll & Ill
C. Ill & IV
D. I, Il, and Ill

A

A

65
Q

During a mercury spillage in the laboratory, what is the most appropriate action to do?
A. Wipe mercury spill with dry cloth.
B. Clean spill with an aspirator bulb,
C. Smother the spill with powdered graphite.
D. Use calcinated absorbent product such as Oil-Dri or Zorball.

A

B

66
Q

What are the components of the fire triangle?
A. oxygen, heat, material
B. oxygen, fuel, heat
C. air, fuel, spark
D. air, fuel, fire

A

B

67
Q

What hazards are represented by the given Globally Harmonized System (GHS) pictogram? [flame with ring]
A. Flammable and self-reactive substances
B. Oxidizers, organic peroxides
C. Carcinogens
D. Explosives

A

B

68
Q

These materials ignite due to the rapid oxidation by oxygen or moisture in the air.
A. Water reactive substances
B. Pyrophoric substances
C. Explosives
D. Flammables

A

B

69
Q

The following are gases under pressure EXCEPT _______
A. Aerosols
B. Liquefied gases
C. Compressed gases
D. All are gases under pressure

A

A

70
Q

It refers to the production of reversible damage to the skin occurring after exposure to a substance or mixture.
A. Skin allergy
B. Skin corrosion
C. Skin irritation
D. Skin necrosis

A

C

71
Q

These are solid particles of a substance or mixture suspended in a gas (usually air).
A. Fog
B. Dusts
C. Mists
D. Vapor

A

B

72
Q

Which of the following can be best used to handle liquid acid spills?
A. Soda ash
B. Aspirator bulb
C. Activated charcoal
D. Acetic acid

A

A

73
Q

This type of toxins in the chemical laboratory may potentially cause allergies or allergic-like reactions.
A. Allergen
B. Corrosive substance
C. Sensitizer
D. Asphyxiants

A

C

74
Q

In the acquisition of chemicals for the laboratory, the following are important considerations EXCEPT __________
A. Cost: chemical purchases must be determined by the cheaper unit price basis of large quantities. Buying bulk quantities will save significant amount of acquisition cost.
B. Availability: check first if the material is available from another laboratory in the institution.
C. Facilities: the incoming chemicals must be managed safely when it arrive
D. Security: the institution must have adequate security measures and required documentations if purchasing a controlled substance

A

A

75
Q

It is a record (usually a database), which in some cases is a required document for compliance, that lists the chemicals in the laboratory, along with information essential for their proper management.
A. Safety datasheet
B. Material safety datasheet
C. Chemical inventory
D. Chemical list

A

C

76
Q

Which of the following acids/are stored properly?
A. Hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid
B. Hydrochloric acid, acetic acid, sulfuric acid, lactic acid
C. Lactic, acid, acetic acid, trichloroacetic acid
D. Lactic acid, acetic acid, perchloric acid

A

C

77
Q

Sodium metal should be best stored in _________
A. dry, ventilated cabinet
B. closed container under kerosene, or mineral oil
C. tightly screw-cap glass bottle
D. closed metal container

A

B

78
Q

This refers to the net result of uptake, transformation and elimination of a substance in an organism due to all routes of exposure.
A. Bioaccumulation
B. Bioavailability
C. Availability
D. Bioconcentration

A

A

79
Q

A hazardous waste characteristic that refers to substances that are unstable under normal conditions and readily undergo violent reaction without detonation.
A. Ignitability
B. Corrosivity
C. Reactivity
D. Toxicity

A

C

80
Q

This refers to a type of waste in which when placed in a landfill is reasonably expected NOT to undergo any physical, chemical, and biological changes to such an extent as to cause health or safety hazards.
A. Stable wastes
B. Infectious wastes
C. Special wastes
D. Inert wastes

A

D

81
Q

What type of container must be used to store waste such as paints and solvents?
A. Polyethylene drum
B. Metal drum
C. Fiber drum
D. Glass drum

A

B

82
Q

It is an act regulating and modernizing the practice of chemistry in the Philippines, otherwise known as the Chemistry Law of the Philippines.
A. RA 6969
B. RA9514
C. RA 10657
D. RA 3720

A

C

83
Q

A sample of water was collected from immediately downstream of an industrial outfall to assess the worst possible situation with regard to potential pollution. What type of sample is used in the situation?
A. Selective sample
B. Random sample
C. Representative sample
D. Composite sample

A

A

84
Q

Which of the following laboratory activities practices green chemistry?
I. Waste prevention
II. Microscale work
lIl. Use of digital thermometers
IV. Catalysis
A. I & II
B. I-III
C. I & II
D. All

A

D

85
Q

When collecting waste in the laboratory a good way to reduce the expense of waste management is to _______
A. Put non-halogenated and halogenated solvents in separate primary containers
B. Plan to recycle solvents
C. Put acids and mixtures of acids and metals in separate primary containers
D. All of the above

A

D

86
Q

An “alkali waste” has a pH of
A. 7
B. 10
C. 10
D. >12.5

A

D

87
Q

A sample that is taken at a specific time to check for the quality of the materials in-process for necessary adjustments.
A. Grab sample
B. Catch sample
C. Composite sample
D. Both A and B

A

D

88
Q

What type of sampling is employed when the goal is to obtain a representative of the entire population and free of bias?
A. Probability sampling
B. Non-probability sampling
C. Acceptance sampling
D. Constant percentage sampling

A

A

89
Q

It is a written program developed and implemented by the employer which sets forth procedures, equipment, PPE, and work practices that are capable of protecting employees from the health hazard presented by hazardous chemicals used in the workplace.
A. Safety Manual
B. Chemical Hygiene Plan
C. Safety Rules and Policies
D. Safety Plan

A

B

90
Q

This type of method consists of a set of instructions about how to carry out a method issued by a national standards body and legislated by the national government to become mandatory.
A. Standard method
B. Regulatory method
C. Reference method
D. Validated method

A

A

91
Q

In starting-up laboratory operations, the following should be observed EXCEPT
A. Turning on the hoods, vents, exhaust fans.
B. Turning the equipment and instruments on.
C. Performing analysis immediately.
D. Monitoring operating parameters

A

C

92
Q

The following groups are known to be peroxide-forming compounds EXCEPT
A. Ethers with primary and/or secondary alkyl groups.
B. Hydrocarbons with allylic, benzylic, or propargylic hydrogens.
C. Conjugated dienes, eneynes, and diynes.
D. All are peroxide-formers.

A

D

93
Q

Which of the following is/are TRUE about the laboratory chemical hood?
I. All work should be carried out at least 15 cm (6 inches) from the front edge of the hood.
II. Before each work, be sure that the hood exhaust system is functioning properly.
Ill. Store hazardous chemicals in the hood to protect personnel from toxic fumes exposure.
IV. The performance of laboratory chemical hood is highly dependent on its location.
A. I and Il
B. II, Ill and IV
C. I, ll, and Ill
D. I, ll, and IV

A

D

94
Q

What hazards are represented by a GHS pictogram with a flame over circle symbol?
A. Flammable and self-reactives
B. Oxidizers, organic peroxides
C. Carcinogens
D. Explosives

A

B

95
Q

It is a hazardous waste characteristic which applies to waste liquids with a flash point less than 140°C or solids capable of spontaneous combustion under normal temp and pressure.
A. Ignitability
B. Reactivity
C. Corrosivity
D. Toxicity

A

A

96
Q

What is the pH of an acidic waste?
A. pH<2
B. pH<3
C. pH≥12.5
D. pH=7

A

A

97
Q

Person who produces hazardous wastes, through any institutional, commercial, industrial, or trade activities.
A. Waste generator
B. Waste treater
C. Waste transporter
D. Pollution Control Officer

A

A

98
Q

The correct hierarchy of control principle (decreasing priority) from a chemical exposure perspective is
I. PPE
II. Engineering controls
Ill. Administrative controls
IV. Elimination
V. Substitution
A. I..>..V
B. I > III > II > IV > V
C. V > IV > II > III > I
D. IV > V > II > III > I

A

D

99
Q

An exposure limit that indicates the maximum average concentration to which workers can safely be exposed for a normal 8-hour workday or 48-hour workweek.
A. Time weighted average (TWA)
B. Short-term exposure limit (STEL)
C. Ceiling (C)
D. Immediately dangerous to life or health (IDLH)

A

A

100
Q

This refers to a single sample or measurement taken at specific time or over a short period as feasible.
A. Grab sample
B. Composite sample
C. Laboratory sample
D. None of the above

A

A

101
Q

The following are good sampling practices EXCEPT
A. Take several increments and composite them to form the sample.
B. If possible, mix the material before getting the sample.
C. Collect sample in a container made of material that will chemically react with the sample.
D. Sample frequently enough to allow for the identification of process cycles.

A

C

102
Q

Which of the following are TRUE about uncertainty?
I. It is a difference between a single measurement or result and its true value.
II. The range of possible values for a measurement.
IlI. A measure of bias in a result or measurement.
IV. It accounts for all errors (both determinate and indeterminate).
A. l and Il
C. ll and Ill
B. l and IV
D. ll and IV

A

D

103
Q

It is a graph showing the time-dependent change in the results of an analysis that is used to monitor whether an analysis is in a state of statistical control.
A. Calibration curve
B. Standard Curve
C. QC chart
D. Monitoring chart

A

C

104
Q

A clean sample (e.g. distilled water) processed through the instrumental steps or the measurement process to determine instrument contamination.
A Method blank
B. Instrument blank
C. Surrogate
D. Reagent blank

A

B

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