Forensic Biology And DNA Analysis – Blood, Semen, And Skeletal Remains Practice Exam

In rifling, what do the terms lands and grooves describe?

The raised and recessed features inside the barrel that impart spin to the bullet. The external ridges on the outside of the barrel. The grooves in the cartridge case. The sights alignment marks.

Correct Answer:

The raised and recessed features inside the barrel that impart spin to the bullet.

Explanation:

Lands and grooves refer to the internal rifling inside the gun barrel. Lands are the raised portions of the bore, while grooves are the recessed channels cut into the bore. As a bullet travels through these features, it is spun, or given angular momentum, which stabilizes its flight. The specific pattern of lands and grooves (including twist rate and depth) helps create this spin and also leaves distinctive rifling marks on the bullet, which is why these features are fundamental in ballistics and firearms identification. The other options describe features outside the bore, such as external barrel ridges, the cartridge case, or sight marks, which are not what lands and grooves refer to.

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