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

Question 1: Steganography as it relates to digital forensics involves:

Creating fake file system structures to mislead investigators
Permanently overwriting data to prevent recovery
Hiding secret data within ordinary-looking digital files such as images or audio (Correct answer)
Encrypting hard drive contents with a passphrase

Correct answer: Hiding secret data within ordinary-looking digital files such as images or audio

Steganography conceals information within a carrier file so the existence of the hidden message is not apparent, making it a counter-forensic technique used by criminals.

Question 2: Which psychological instrument is most commonly used to detect feigned mental illness during forensic evaluations?

Structured Interview of Reported Symptoms (SIRS)
Beck Depression Inventory (BDI)
Structured Clinical Interview for DSM (SCID)
Minnesota Multiphasic Personality Inventory-2 (MMPI-2) (Correct answer)

Correct answer: Minnesota Multiphasic Personality Inventory-2 (MMPI-2)

The MMPI-2 contains multiple validity scales (e.g., F, Fp, Fb) specifically designed to detect symptom exaggeration, over-reporting, and malingering.

Question 3: Hash values (MD5, SHA-256) are used in digital forensics primarily to:

Detect malware hidden within image files
Encrypt sensitive case files during transmission
Verify that a forensic copy is an exact, unaltered duplicate of the original evidence (Correct answer)
Index and search large volumes of digital evidence quickly

Correct answer: Verify that a forensic copy is an exact, unaltered duplicate of the original evidence

Matching hash values between the original and forensic copy mathematically proves the copy is identical, ensuring evidentiary integrity.

Question 4: Which federal law governs the handling and disposal of hazardous biological materials in a forensic lab?

OSHA Bloodborne Pathogens Standard (Correct answer)
HIPAA
Clean Air Act
FERPA

Correct answer: OSHA Bloodborne Pathogens Standard

OSHA's Bloodborne Pathogens Standard (29 CFR 1910.1030) mandates procedures for handling materials that may contain blood or other potentially infectious materials.

Question 5: What is the significance of 'rigor mortis' in determining time of death?

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

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

Soot, stippling, and a muzzle contusion (stellate/star-shaped laceration) from gases entering the wound (Correct answer)
A clean, round entrance without any residue
No powder residue because it is consumed at close range
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 7: In forensic anthropology, the 'biological profile' of unidentified skeletal remains includes which four components?

Name, height, weight, and cause of death
DNA type, blood type, fingerprints, and dentition
Sex, age, ancestry, and stature (Correct answer)
Occupation, health history, geographic origin, and date 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 8: Which term describes the stiffening of muscles that occurs after death due to the depletion of ATP?

Rigor mortis (Correct answer)
Putrefaction
Algor mortis
Livor 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 9: In forensic risk assessment, the term 'actuarial method' refers to which approach?

Neuroimaging to predict recidivism
Use of statistically derived instruments with validated risk factors (Correct answer)
Reliance on polygraph results to determine future risk
Clinical judgment based solely on interview observations

Correct answer: Use of statistically derived instruments with validated risk factors

Actuarial risk assessment uses statistically validated tools (e.g., STATIC-99, VRAG) that combine specific risk factors to produce numerical recidivism probability estimates.

Question 10: In cybercrime investigation, 'phishing' is defined as:

Physically stealing hardware to access sensitive data
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

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 11: The manner of death refers to:

The specific disease or injury that directly caused death
The medical mechanism by which life ceased
The physical location where the individual died
The circumstances under which death occurred (natural, accident, homicide, suicide, undetermined) (Correct answer)

Correct answer: The circumstances under which death occurred (natural, accident, homicide, suicide, undetermined)

Manner of death is a medicolegal classification of the circumstances of death, whereas cause of death identifies the specific condition responsible for dying.

Question 12: In forensic biology, a 'negative control' sample used during DNA extraction contains:

Blood from the victim as a comparison standard
Degraded DNA to test instrument sensitivity
A known male DNA sample as a reference
No DNA, processed identically to evidence samples to detect contamination (Correct answer)

Correct answer: No DNA, processed identically to evidence samples to detect contamination

A negative extraction control contains only reagents, not biological material, and any signal from it indicates contamination introduced during the extraction process.

Question 13: Volatile memory in a computer (RAM) must be acquired before powering down the device because:

It loses all data when power is removed, and may contain passwords, encryption keys, or running processes (Correct answer)
RAM is the only place where deleted files are stored
Operating systems always delete RAM contents after shutdown
Encrypted drives can only be decrypted using RAM data

Correct answer: It loses all data when power is removed, and may contain passwords, encryption keys, or running processes

RAM is non-persistent storage; powering off destroys any data in memory, including live network connections, decryption keys, and running application data.

Question 14: Phenolphthalein (Kastle-Meyer) test is a presumptive test used to detect:

Saliva
Semen
Blood (Correct answer)
Urine

Correct answer: Blood

The phenolphthalein test detects the peroxidase-like activity of hemoglobin in blood, producing a pink color as a rapid presumptive screening result.

Question 15: Which type of glass fracture pattern results from a low-velocity impact?

Both radial and concentric fractures, with radial first (Correct answer)
Concentric fractures only
Radial fractures only
Stress fractures with no clear pattern

Correct answer: Both radial and concentric fractures, with radial first

A low-velocity impact creates radial fractures first, followed by concentric fractures as the glass continues to fail under stress.

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

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
The actual content of encrypted files

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

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

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 18: What is the primary distinction between a 'signature' and a 'modus operandi' in serial offense analysis?

Signature is only relevant in sexual offenses; MO applies to all crimes
Signature can change between crimes; MO remains constant
Signature reflects psychological needs expressed beyond what is necessary; MO is the functional method of committing the crime (Correct answer)
Signature refers to legal elements; MO refers to psychological ones

Correct answer: Signature reflects psychological needs expressed beyond what is necessary; MO is the functional method of committing the crime

The signature reflects the offender's psychological and emotional needs (e.g., ritual behaviors) and remains consistent, while the MO consists of practical behaviors that may evolve.

Question 19: The term 'petechial hemorrhages' in forensic pathology refers to:

Hemorrhaging within the brain after head injury
Bruising patterns left by a ligature around the neck
Large bruises caused by blunt force trauma
Tiny pinpoint hemorrhages in the conjunctiva or skin caused by increased venous pressure, often associated with asphyxia (Correct answer)

Correct answer: Tiny pinpoint hemorrhages in the conjunctiva or skin caused by increased venous pressure, often associated with asphyxia

Petechiae result from rupture of small capillaries under increased pressure during asphyxia, forming a classic finding in strangulation and hanging deaths.

Question 20: In forensic toxicology, what does a 'chain of custody' document ensure?

The integrity and accountability of a sample from collection to court (Correct answer)
The suspect was read their Miranda rights
The toxicologist has proper credentials
Laboratory equipment is properly calibrated

Correct answer: The integrity and accountability of a sample from collection to court

Chain of custody documentation tracks every person who handled a sample, ensuring its integrity is unbroken and legally defensible.

Question 21: Which class of compounds does the Duquenois-Levine test presumptively identify?

Benzodiazepines
Amphetamines
Cocaine alkaloids
Cannabinoids (marijuana) (Correct answer)

Correct answer: Cannabinoids (marijuana)

The Duquenois-Levine test produces a purple color in the presence of THC and other cannabinoids and is the standard presumptive test for marijuana.

Question 22: When collecting a wet blood sample from a crime scene for preservation, a forensic scientist should:

Immediately seal it in a plastic zip-lock bag
Freeze it in liquid nitrogen in the field
Allow it to air dry completely before packaging in paper (Correct answer)
Mix it with a preservative on-site

Correct answer: Allow it to air dry completely before packaging in paper

Wet blood must be air dried before paper packaging to prevent microbial growth and DNA degradation caused by trapped moisture.

Question 23: Which principle guides the classification of deaths as 'homicide' by a medical examiner?

Another person's actions caused or contributed to the death (Correct answer)
The death resulted in a criminal prosecution
The death occurred in a public location
The victim was known to have enemies

Correct answer: Another person's actions caused or contributed to the death

A medical examiner classifies a death as homicide when another person's volitional act caused or substantially contributed to it, regardless of criminal intent or prosecution outcome.

Question 24: A write blocker is used in digital forensics to:

Prevent any data from being written to the original evidence drive during acquisition (Correct answer)
Block unauthorized internet access during analysis
Encrypt the forensic image after acquisition
Speed up the copying process of large hard drives

Correct answer: Prevent any data from being written to the original evidence drive during acquisition

A write blocker intercepts write commands so the forensic investigator can read data from the original media without accidentally altering or adding any information.

Question 25: A mixed DNA profile occurs when a forensic sample contains genetic material from:

Amplified DNA that has cycled too many times
Only male contributors to the sample
A degraded single-source sample
Two or more contributors (Correct answer)

Correct answer: Two or more contributors

Mixed profiles contain alleles at one or more loci from multiple individuals, which complicates statistical interpretation and contributor deduction.

Question 26: Which term describes the process by which the body eliminates a drug, typically through metabolism and excretion?

Elimination (Correct answer)
Biotransformation
Distribution
Absorption

Correct answer: Elimination

Elimination refers to the combined processes of drug metabolism and excretion that remove a substance from the body.

Question 27: Which analytical technique is considered the gold standard for confirming the identity and purity of an unknown substance in forensic chemistry?

Infrared spectroscopy (IR) or mass spectrometry (MS) (Correct answer)
Color (colorimetric) tests
Immunoassay testing
Thin-layer chromatography (TLC)

Correct answer: Infrared spectroscopy (IR) or mass spectrometry (MS)

Infrared spectroscopy and mass spectrometry provide confirmatory identification of unknown substances by revealing their molecular structure and fragmentation patterns.

Question 28: Forensic DNA phenotyping (FDP) refers to:

Comparing two DNA profiles to determine kinship
Typing blood group antigens from genetic sequences
Calculating the probability of a DNA match to a suspect
Predicting physical appearance traits such as eye color, hair color, and ancestry from DNA evidence (Correct answer)

Correct answer: Predicting physical appearance traits such as eye color, hair color, and ancestry from DNA evidence

FDP uses single nucleotide polymorphisms (SNPs) to generate predictive information about an unknown contributor's appearance and biogeographic ancestry.

Question 29: The presumptive color test that turns purple/blue in the presence of opioids is known as the:

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

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

Stains DNA bands for gel electrophoresis
Amplifies small or degraded DNA samples into quantities sufficient for analysis (Correct answer)
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 31: Which analytical technique is most commonly used in forensic labs to identify unknown substances by separating and detecting components in a sample?

Gas chromatography-mass spectrometry (GC-MS) (Correct answer)
UV-Vis spectrophotometry only
Infrared spectroscopy only
Nuclear magnetic resonance 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 32: 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)
Deletion of an STR locus from the CODIS database
An artifact produced during PCR amplification
The presence of extra alleles from contamination

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.

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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