BSFS Bachelor of Science in Forensic Science 5

Question 1

Which statistical concept is central to interpreting DNA evidence and expressing the rarity of a DNA profile?

Accepted Answer

Random match probability calculated from population databases

Answer

Random match probability estimates how likely it is that a randomly chosen unrelated person from the population would share the same DNA profile, typically expressed as 1 in billions or trillions.

Question 2

What is the role of a 'known standard' in forensic firearms examination?

Accepted Answer

Test-fired ammunition from the suspect weapon used to compare toolmarks with evidence cartridges

Answer

A known standard consists of cartridge cases and bullets test-fired from the suspect firearm, providing toolmark samples for direct microscopic comparison with evidence recovered at the scene.

Question 3

Which type of impression evidence can be collected from a soft surface like mud or snow at a crime scene?

Accepted Answer

Three-dimensional cast using dental stone or sulfur casting compound

Answer

Three-dimensional impressions in soft surfaces like mud, snow, or soil are cast with dental stone or similar casting compound to create a permanent physical replica.

Question 4

In forensic chemistry, what distinguishes a 'confirmatory test' from a 'presumptive test'?

Accepted Answer

Presumptive tests indicate possible presence of a substance; confirmatory tests provide definitive identification

Answer

Presumptive tests are rapid screening methods that suggest the possible presence of a substance, while confirmatory tests use methods like GC-MS to provide scientifically definitive identification.

Question 5

What is 'trace evidence' in the context of forensic science?

Accepted Answer

Small, often microscopic physical material transferred during criminal activity

Answer

Trace evidence refers to small physical materials such as hairs, fibers, glass fragments, soil, and pollen that are transferred during the commission of a crime.

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS Bachelor of Science in Forensic Science 5