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 1. In forensic ballistics, what is the term for the raised area between the grooves inside a firearm's barrel?

A. Caliber

B. Land

C. Rifling

D. Smoothbore


2. Which term refers to the internal diameter of a firearm's barrel, typically measured between opposing lands, or the diameter of the ammunition designed for it?

A. Caliber

B. Land

C. Rifling

D. Smoothbore


3. During a forensic investigation, a ballistics expert examines a fired bullet and notices distinct impressions left by the raised ridges inside the gun barrel. What are these specific raised helical structures called?

A. Caliber

B. Land

C. Rifling

D. Smoothbore


4. What is the name for the overall system of spiral grooves and ridges machined into the interior of a firearm barrel to impart a stabilizing spin on a bullet?

A. Caliber

B. Land

C. Rifling

D. Smoothbore


5. Which type of firearm design features a completely flat, ungrooved interior barrel surface that does not impart a spin on the projectile?

A. Caliber

B. Land

C. Rifling

D. Smoothbore


6. During a forensic examination of a fired cartridge case recovered from a crime scene, the ballistician observes a distinct toolmark on the rim or the groove of the casing. This mark is left when the mechanical claw of the firearm pulls the spent shell out of the breech chamber after firing. Which of the following marks is being described?

A. Firing Pin Mark

B. Extractor Mark

C. Ejector Mark

D. Shearing Mark


7. A suspect weapon is test-fired in a laboratory. Upon examining the base of the fired cartridge case, the examiner notes a deep indentation directly in the center of the primer cup, caused by the strike that ignited the priming mixture. What type of mark is this?

A. Firing Pin Mark

B. Extractor Mark

C. Ejector Mark

D. Shearing Mark


8. In a homicide investigation, a spent cartridge case is found with a clear, localized scuff mark on the rear face of the head, typically located opposite the extractor mark. This mark is created when the cartridge is pushed forward and flipped out of the firearm's ejection port by a protruding metal component. This is known as a/an:

A. Firing Pin Mark

B. Extractor Mark

C. Ejector Mark

D. Shearing Mark


9. While examining a cartridge case fired from a semi-automatic pistol, a forensic ballistics expert notices a shaved or striated mark on the primer. This happens when the firing pin protrudes from the breech face as the barrel drops down during the unlocking cycle, causing the metal to scrape. This specialized toolmark is called a:

A. Firing Pin Mark

B. Extractor Mark

C. Ejector Mark

D. Shearing Mark


10. Which of the following marks on a cartridge case is primarily produced by the rearward motion of the casing pushing against the ejector block or pin, effectively forcing the empty shell to spin out of the gun?

A. Firing Pin Mark

B. Extractor Mark

C. Ejector Mark

D. Shearing Mark


Police Photography Reviewer


Forensic Chemistry  and Toxicology Reviewer


Answer:

1. B

2. A

3. B

4. C

5. D

6. B

7. A

8. C

9. D

10. C