Forensic Science Quiz

Grade 12 · Science · Quiz

Evaluate your knowledge of forensic methods, evidence analysis, and crime scene investigation techniques.

Questions

1. Which reagent is commonly used to presumptively test for the presence of blood at a crime scene?

   1. Ninhydrin
   2. Luminol
   3. Sudan IV
   4. Fehling's solution
   Show answer

   Answer: Luminol

   Luminol reacts with the iron in hemoglobin to produce chemiluminescence visible in the dark; it can detect blood even after cleaning and dilution.

2. Rigor mortis typically begins within how many hours after death?

   1. 12-24 hours
   2. 24-48 hours
   3. 2-4 hours
   4. Immediately at the moment of death
   Show answer

   Answer: 2-4 hours

   Rigor mortis begins approximately 2-4 hours post-mortem as ATP is depleted and muscles stiffen; it reaches maximum stiffness around 12 hours and resolves by 48-72 hours.

3. What is the primary purpose of the CODIS database in forensic investigation?

   1. Store toxicology reports from autopsies
   2. Match DNA profiles from crime scenes to known individuals
   3. Archive fingerprint records from convicted criminals
   4. Document chain of custody for all physical evidence
   Show answer

   Answer: Match DNA profiles from crime scenes to known individuals

   CODIS contains STR profiles from crime scene evidence and convicted offenders; investigators upload crime-scene profiles and search for matching offender profiles.

4. The Daubert standard (used in U.S. federal courts) governs:

   1. How DNA evidence must be collected
   2. The admissibility of expert scientific testimony
   3. Chain of custody documentation requirements
   4. Minimum evidence required for an arrest warrant
   Show answer

   Answer: The admissibility of expert scientific testimony

   The Daubert standard (Daubert v. Merrell Dow Pharmaceuticals, 1993) requires federal judges to evaluate whether scientific testimony is based on sufficient facts and reliable methodology.

5. Which type of bloodstain indicates the direction of travel of a blood droplet?

   1. Satellite spatter
   2. Cast-off pattern
   3. A stain with a satellite and tail pointing in the direction of travel
   4. Arterial spurting pattern
   Show answer

   Answer: A stain with a satellite and tail pointing in the direction of travel

   Bloodstain shape analysis: a circular droplet fell perpendicular; an elongated stain with a satellite tail (scalloped edge on the trailing side) points in the direction the drop was traveling.

6. In forensic entomology, the presence of blowfly pupae (but no adult flies) on remains most likely indicates:

   1. Death occurred within the last 24 hours
   2. Death occurred several days to a week or more prior
   3. The remains were moved after death
   4. The victim was poisoned
   Show answer

   Answer: Death occurred several days to a week or more prior

   Blowfly pupae (third instar larvae) form days after egg-laying; their presence without adults suggests death occurred enough time prior for larval development to proceed through multiple instars.

7. Fingerprint ridge patterns can change significantly over a person's lifetime through normal aging.

   Show answer

   Answer: False

   Fingerprint ridge patterns (loops, whorls, arches and their minutiae) are determined before birth and remain stable throughout life barring physical scarring of the dermis.

8. The analysis of handwriting, documents, and ink to detect forgery is called questioned _____ examination.

   Show answer

   Answer: document

   Questioned document examination involves analyzing handwriting, ink chemistry, paper composition, and printing methods to authenticate or detect forgery in documents.

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