Bachelor of Science in Forensic Science (BSFS) — Questions and Answers

Question 1: Which type of glass fracture pattern indicates the direction of force applied?

Concentric fractures around the impact point
All of the above contribute to directionality analysis (Correct answer)
Hackle marks on the glass edge
Radial fractures extending outward from the impact

Correct answer: All of the above contribute to directionality analysis

Forensic glass analysis uses radial and concentric fracture patterns together with hackle marks and rib marks to determine the direction and sequence of impacts.

Question 2: MAC times in digital forensics refer to:

Maximum Access Count limits on file retrieval
Modified, Accessed, and Changed (or Created) timestamps associated with files (Correct answer)
Media Access Control addresses stored in system logs
Memory Allocation Code times for RAM forensics

Correct answer: Modified, Accessed, and Changed (or Created) timestamps associated with files

MAC timestamps record when a file was last modified, accessed, and when its metadata was changed, providing a chronological record of file activity on a system.

Question 3: A contact gunshot wound to the head typically produces which distinctive finding around the wound?

A clean, round entrance without any residue
No powder residue because it is consumed at close range
Soot, stippling, and a muzzle contusion (stellate/star-shaped laceration) from gases entering the wound (Correct answer)
Only an exit wound with no entrance characteristics

Correct answer: Soot, stippling, and a muzzle contusion (stellate/star-shaped laceration) from gases entering the wound

Contact wounds show blackening from soot, no stippling (since powder doesn't travel through air), and gas-driven stellate skin lacerations when fired against the skull.

Question 4: What is a 'questioned document' in forensic science?

A court subpoena for lab records
A classified government file
A document written in a foreign language
A document whose authenticity, authorship, or content is in dispute (Correct answer)

Correct answer: A document whose authenticity, authorship, or content is in dispute

A questioned document is any document whose origin, authorship, or content is disputed and submitted for forensic examination.

Question 5: In forensic firearms examination, what is a 'striation'?

The caliber marking stamped on a cartridge case
A serial number etched into the firearm frame
The pattern of gunshot residue around a wound
A microscopic scratch or groove left on a bullet by the barrel's rifling (Correct answer)

Correct answer: A microscopic scratch or groove left on a bullet by the barrel's rifling

Striations are unique microscopic scratches left by a gun barrel's rifling on a bullet as it passes through, allowing examiners to match bullets to specific firearms.

Question 6: What is the significance of 'rigor mortis' in determining time of death?

It indicates the manner of death
It reveals the victim's blood type
It shows whether the body was moved after death
It provides a general time window by the progression and resolution of muscle stiffening (Correct answer)

Correct answer: It provides a general time window by the progression and resolution of muscle stiffening

Rigor mortis begins a few hours after death, peaks around 12 hours, and resolves by 24–48 hours, helping estimate the postmortem interval.

Question 7: Which analytical technique is most commonly used in forensic labs to identify unknown substances by separating and detecting components in a sample?

Infrared spectroscopy only
Gas chromatography-mass spectrometry (GC-MS) (Correct answer)
Nuclear magnetic resonance only
UV-Vis spectrophotometry only

Correct answer: Gas chromatography-mass spectrometry (GC-MS)

GC-MS is the gold standard for forensic substance identification because it combines separation power with definitive molecular identification.

Question 8: In forensic anthropology, the 'biological profile' of unidentified skeletal remains includes which four components?

DNA type, blood type, fingerprints, and dentition
Sex, age, ancestry, and stature (Correct answer)
Occupation, health history, geographic origin, and date of death
Name, height, weight, and cause of death

Correct answer: Sex, age, ancestry, and stature

Forensic anthropologists establish a biological profile by estimating sex from pelvic morphology, age from bone development, ancestry from skull morphology, and stature from long bone lengths.

Question 9: In arson investigation, which chemical class of accelerants is most commonly detected using GC-MS?

Ketones
Petroleum distillates (Correct answer)
Alcohols
Aldehydes

Correct answer: Petroleum distillates

Petroleum distillates such as gasoline, kerosene, and lighter fluid are the most frequently encountered accelerants in arson cases and are reliably detected by GC-MS.

Question 10: What does the term 'postmortem interval' (PMI) refer to in forensic pathology?

The duration of a coroner's investigation
The time between arrest and autopsy
The elapsed time since a person died (Correct answer)
The interval between cause and manner of death

Correct answer: The elapsed time since a person died

Postmortem interval is the estimated time that has elapsed since death, determined using biological and environmental indicators.

Question 11: The first step a digital forensic investigator should take when seizing a computer as evidence is to:

Connect the drive to the internet to sync cloud data
Open the computer and review files immediately
Run antivirus software to clean malware
Create a forensic bit-for-bit image of the storage media before any analysis (Correct answer)

Correct answer: Create a forensic bit-for-bit image of the storage media before any analysis

Creating a forensic image preserves the original evidence in an unaltered state, allowing analysis to be performed on the copy without modifying the original.

Question 12: Polymerase chain reaction (PCR) is used in forensic DNA analysis primarily because it:

Amplifies small or degraded DNA samples into quantities sufficient for analysis (Correct answer)
Stains DNA bands for gel electrophoresis
Directly identifies the sequence of nucleotides without amplification
Creates a physical cast of chromosomal structure

Correct answer: Amplifies small or degraded DNA samples into quantities sufficient for analysis

PCR exponentially replicates target DNA sequences, enabling analysis of trace or degraded biological evidence that would otherwise be insufficient for profiling.

Question 13: CODIS, the national DNA database used by forensic labs in the U.S., stands for:

Criminal Offender DNA Identification System
Centralized DNA Observation and Indexing System
Comprehensive Offender Database and Identification System
Combined DNA Index System (Correct answer)

Correct answer: Combined DNA Index System

CODIS is the FBI's national database that links DNA profiles from crime scenes with known offenders to assist in solving crimes across jurisdictions.

Question 14: The Scott test is a presumptive field test used specifically for identifying:

Cocaine (Correct answer)
Cannabis
Methamphetamine
Heroin

Correct answer: Cocaine

The Scott test uses cobalt thiocyanate reagent and turns blue in the presence of cocaine, serving as a presumptive field identification test.

Question 15: The presumptive test for semen that detects the enzyme acid phosphatase is known as:

Brentamine Fast Blue test
PSA ELISA test
AP spot test (acid phosphatase test) (Correct answer)
Luminol test

Correct answer: AP spot test (acid phosphatase test)

The acid phosphatase spot test detects high concentrations of AP secreted by the prostate gland in semen, producing a purple color as a presumptive result.

Question 16: File metadata in digital forensics can reveal which of the following?

The actual content of encrypted files
Creation, modification, and access timestamps, as well as file author and location (Correct answer)
The specific user who physically typed a document
Whether a file was physically deleted from a drive

Correct answer: Creation, modification, and access timestamps, as well as file author and location

Metadata embedded in files records important context such as when a file was created or modified, author name, GPS coordinates, and software version used.

Question 17: Which term describes the stiffening of muscles that occurs after death due to the depletion of ATP?

Rigor mortis (Correct answer)
Putrefaction
Livor mortis
Algor mortis

Correct answer: Rigor mortis

Rigor mortis begins 2–6 hours after death, peaks at 12 hours, and resolves by 24–48 hours as muscle proteins break down due to loss of ATP-driven cross-bridge cycling.

Question 18: What is the primary purpose of forensic odontology?

Analyzing bite marks and identifying individuals through dental records (Correct answer)
Estimating age from facial bone structure
Performing autopsies on dental professionals
Comparing DNA extracted from tooth enamel

Correct answer: Analyzing bite marks and identifying individuals through dental records

Forensic odontology uses dental records, bite mark analysis, and dental comparisons to identify deceased individuals or link suspects to crimes.

Question 19: The legal blood alcohol concentration (BAC) limit for driving in most U.S. states for adults is:

0.02%
0.08% (Correct answer)
0.10%
0.05%

Correct answer: 0.08%

The per se legal limit for DUI in all 50 U.S. states is 0.08% BAC for drivers aged 21 and older.

Question 20: Touch DNA refers to DNA recovered from:

Saliva on cigarette butts only
Skin cells deposited when a person handles or touches an object (Correct answer)
Hair with attached follicles
Blood left at a scene after cleaning

Correct answer: Skin cells deposited when a person handles or touches an object

When a person touches a surface, they deposit epithelial (skin) cells containing nuclear DNA, which can be collected and profiled even without visible biological fluid.

Question 21: The presumptive color test that turns purple/blue in the presence of opioids is known as the:

Duquenois-Levine test
Cobalt thiocyanate test
Scott test
Marquis test (Correct answer)

Correct answer: Marquis test

The Marquis reagent reacts with opioids to produce a characteristic purple-to-blue color, serving as a rapid field presumptive test.

Question 22: In cybercrime investigation, 'phishing' is defined as:

Intercepting network traffic to eavesdrop on communications
Fraudulent communications that impersonate legitimate entities to steal credentials or install malware (Correct answer)
Hacking into a network using brute-force password attacks
Physically stealing hardware to access sensitive data

Correct answer: Fraudulent communications that impersonate legitimate entities to steal credentials or install malware

Phishing uses deceptive emails, websites, or messages that mimic trusted sources to trick victims into revealing passwords, financial information, or downloading malware.

Question 23: Adipocere formation, a postmortem change, occurs when body fat converts to:

A waxy, soap-like substance in moist, anaerobic environments (Correct answer)
Crystalline calcium deposits over decades
Dry, leathery tissue in hot, arid conditions
Carbon dioxide and water in aerobic conditions

Correct answer: A waxy, soap-like substance in moist, anaerobic environments

Adipocere (grave wax) forms through saponification of body fat under moist, anaerobic conditions, preserving the body's shape and slowing decomposition.

Question 24: Which phenomenon describes a suspect's false belief that confessing is in their best interest due to police deception or psychological pressure?

Coerced-compliant false confession (Correct answer)
Internalized false confession
Recanted confession
Voluntary false confession

Correct answer: Coerced-compliant false confession

A coerced-compliant false confession occurs when suspects confess to escape an aversive interrogation while privately knowing they are innocent.

Question 25: Y-STR analysis is specifically used in sexual assault cases because it can:

Date when sexual contact occurred
Distinguish the male contributor's profile from a predominantly female victim sample (Correct answer)
Identify the blood type of the male contributor
Determine the exact number of sperm cells present

Correct answer: Distinguish the male contributor's profile from a predominantly female victim sample

Y-STRs target the male-specific Y chromosome, allowing the male contributor's profile to be recovered even from mixtures dominated by female DNA.

Question 26: What department at the crime lab is in charge of checking the body fluids and organs for the presence of drugs and poisons?

toxicology (Correct answer)
evidence collection
toolmarks
photography

Correct answer: toxicology

The toxicology department in a crime lab specializes in the identification and quantification of drugs, poisons, and other toxic substances in body fluids and tissues. Forensic toxicologists play a crucial role in determining the cause and manner of death, investigating drug-related crimes, and assessing impairment in cases like impaired driving.

Question 27: Which department of the contemporary crime lab is in charge of processing evidence using chemistry, physics, and geology?

physical science (Correct answer)
biology
photography
fingerprints

Correct answer: physical science

The physical science unit within a modern crime lab is responsible for examining non-biological evidence using principles from chemistry, physics, and geology. This includes analyzing trace evidence like paint, glass, soil, as well as drugs, explosives, and other materials to provide scientific insights relevant to criminal investigations.

Question 28: Algor mortis is the postmortem phenomenon used to estimate time of death based on:

The degree of putrefactive odor produced
The rate of muscle stiffening after death
Chemical changes in the vitreous humor of the eye
The cooling of the body after death until it equilibrates with ambient temperature (Correct answer)

Correct answer: The cooling of the body after death until it equilibrates with ambient temperature

The body cools approximately 1–1.5°C per hour under standard conditions; measuring core body temperature and comparing it to ambient temperature helps estimate postmortem interval.

Question 29: In STR analysis, 'allelic dropout' refers to:

Failure to detect one or both alleles at a locus due to low or degraded DNA (Correct answer)
An artifact produced during PCR amplification
The presence of extra alleles from contamination
Deletion of an STR locus from the CODIS database

Correct answer: Failure to detect one or both alleles at a locus due to low or degraded DNA

Allelic dropout occurs when a true allele is not amplified or detected, typically due to degraded template DNA or inhibitors, potentially causing a false exclusion.

Question 30: Postmortem redistribution of drugs is a concern in forensic toxicology because it can:

Improve the accuracy of blood drug measurements
Cause drug concentrations to increase or change after death, complicating interpretation (Correct answer)
Only affect alcohol levels
Always reduce drug concentrations to zero

Correct answer: Cause drug concentrations to increase or change after death, complicating interpretation

After death, drugs can migrate from organs with high concentrations into blood, making postmortem drug levels unreliable if not collected from the correct site promptly.

Question 31: In bloodstain pattern analysis, what does a 'satellite stain' indicate?

Blood from a secondary victim
Blood that traveled by wind
A small droplet that broke away from a larger impact stain (Correct answer)
A stain left by a weapon

Correct answer: A small droplet that broke away from a larger impact stain

Satellite stains are small secondary droplets that break off from a parent drop upon impact and land near the main stain.

Question 32: In digital forensics, 'carving' refers to:

Recovering files from unallocated disk space based on file signatures, without relying on the file system (Correct answer)
Parsing log files to identify user activity
Physically extracting a hard drive from its casing
Removing malware code from infected system files

Correct answer: Recovering files from unallocated disk space based on file signatures, without relying on the file system

File carving searches raw disk data for known file headers and footers (signatures) to reconstruct deleted or fragmented files that are no longer referenced by the file system.

Bachelor of Science in Forensic Science (BSFS)

The BSFS degree program trains students in the scientific analysis of physical evidence across all crime laboratory disciplines, including forensic biology, chemistry, digital forensics, pathology, and legal principles. Program assessments such as the Forensic Science Assessment Test (FSAT) evaluate competency across all core forensic domains.

Questions

35 min

Time Limit

70%

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