Forensic Ballistics: Velocity, Penetration and Wound Ballistics
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
About this mock
Medium-band UGC-NET Forensic Science Paper II Unit V drill on muzzle-velocity measurement, terminal energy and wound ballistics. The set opens with the chronograph: sky-screen optical chronographs (start-screen and stop-screen photo-electric triggers), infrared chronographs of the Magnetospeed and ProChrono style, and magnetic-coil chronographs, with the standard 3 metre to 5 metre placement from the muzzle, screen spacing, and environmental corrections for temperature and air density that the examiner must apply before reporting V0. Kinetic energy is covered through the canonical KE = (1/2)mv^2 formula in SI units (joules from kilograms and metres per second), with worked examples in the 9 mm Parabellum 115-grain class at 360 m/s, the foot-pound to joule conversion factor (1 ft-lb = 1.356 J), and the v-squared dependence that explains why a small drop in velocity gives a large drop in retained energy. Penetration testing is examined through the FBI 10 percent ordnance gelatin standard: block size (15 x 15 x 50 cm), conditioning temperature (4 degrees Celsius), and the BB drop calibration shot (8.5 cm penetration at 180 m/s) that certifies a block as on-spec, plus the 12-inch to 18-inch FBI penetration window for service handgun ammunition. Synthetic clear ballistic gelatin and ballistic soap are compared as gelatin-equivalent media. The wound-channel half of the mock covers the permanent cavity (crushed tissue along the bullet track) versus the temporary cavity (radial stretch of elastic tissue), bullet yaw and tumble inside tissue, the M193 5.56 mm fragmentation threshold at velocities above 700 m/s, JHP controlled expansion and FMJ over-penetration, the hydraulic shock damage to non-elastic organs such as liver and brain, and the disputed sonic pressure-pulse remote-wounding hypothesis. Indian medico-legal aspects close the set: entrance versus exit wound features (abrasion collar, soot, tattooing, eversion), range estimation from wound morphology, and the BSA 2023 Section 39 expert opinion clause. Cited authorities are DiMaio's Gunshot Wounds, Heard's Handbook of Firearms and Ballistics, Fackler's wound ballistics papers, McCoy's Modern Exterior Ballistics, Saferstein, Sharma B.R., and Modi's Medical Jurisprudence and Toxicology.
Aimed at UGC-NET Forensic Science Paper II aspirants targeting Unit V (Forensic Ballistics, Toolmarks and Explosives), NFSU MSc Forensic Science students preparing for the ballistics laboratory rotation, FACT aptitude candidates, and serving Indian state-CID and CFSL trainees who handle gunshot-wound casework alongside the post-mortem surgeon.
Topics covered:
- Chronograph types: sky-screen, infrared, magnetic, placement and corrections
- Kinetic energy: KE = (1/2)mv^2 in joules and foot-pounds, worked examples
- Range and energy loss: drag, v-squared dependence, ballistic coefficient
- Ordnance gelatin: 10 percent FBI block, BB calibration, 4 degree Celsius hold
- FBI 12-inch to 18-inch penetration window for service handgun ammunition
- Wound cavities: permanent (crushed) versus temporary (stretched) channel
- Bullet behaviour in tissue: yaw, tumble, M193 fragmentation, JHP expansion
- Indian medico-legal: entrance vs exit wound, range estimation, BSA Section 39
Sit it in one go, treat distractors as near-twin alternatives, and revisit every wrong answer against the cited DiMaio, Heard, Fackler, Saferstein, Sharma and Modi references before moving on. Allow 30 minutes.
Sources & references
Questions in this mock are written and verified against the following sources. Citations are recorded per question and shown in the explanation after submission.
- cited in 6 questions
DiMaio V J M, Gunshot Wounds, 3rd edition, CRC Press, 2016
FBI Ballistic Research Facility standard ordnance gelatin block geometry: 6 x 6 x 20 inches for handgun cartridge testing
- cited in 5 questions
Fackler M L, Wound ballistics: a review of common misconceptions, Bulletin of the New York Academy of Medicine, 1988
Wound profile concept: permanent cavity (crushed tissue along bullet track) versus temporary cavity (transient radial stretch)
- cited in 4 questions
Heard B J, Handbook of Firearms and Ballistics, 2nd edition, Wiley-Blackwell, 2008
External Ballistics chapter: worked muzzle-energy example for 9 mm Parabellum service ammunition
- cited in 3 questions
McCoy R L, Modern Exterior Ballistics, Schiffer Publishing, 1999
Velocity decay and kinetic-energy decay along the trajectory: square dependence of energy on velocity
- cited in 2 questions
Modi J P, A Textbook of Medical Jurisprudence and Toxicology, 26th edition, LexisNexis
Gunshot wound chapter: differentiation of entrance and exit wounds on morphology, eversion and abrasion collar
- cited in 2 questions
Fackler M L and Malinowski J A, The wound profile: a visual method for quantifying gunshot wound components, Journal of Trauma 1985
Ordnance gelatin preparation and BB calibration for FBI Ballistic Research Facility protocol
- cited in 1 question
Jussila J, Preparing ballistic gelatine: review and proposal for a standard method, Forensic Science International, 2004
Comparison of 10 percent ordnance gelatin, ballistic soap and synthetic gelatin substitutes for terminal ballistic testing
- cited in 1 question
Fackler M L et al., Wounding effects of the AK-47 rifle, American Journal of Forensic Medicine and Pathology, 1990
5.56 mm M193 fragmentation threshold: about 700 to 825 m/s impact velocity, mechanism at the cannelure groove
- cited in 1 question
Suneson A et al., Pressure wave injuries to the nervous system caused by high-energy missile extremity impact, Journal of Trauma, 1990
Sonic pressure pulse and remote-organ injury: Fackler and IWBA critique versus Suneson animal experiments
- cited in 1 question
McCoy R L, Modern Exterior Ballistics: The Launch and Flight Dynamics of Symmetric Projectiles, Schiffer Publishing, 1999
Chronograph practice for muzzle-velocity determination: standoff distance and screen spacing conventions
- cited in 1 question
Fackler M L et al., Wounding effects of the AK-47 rifle used by Patrick Purdy in the Stockton schoolyard shooting, American Journal of Forensic Medicine and Pathology, 1990
5.56 mm M193 wound profile: yaw at 12 cm, fragmentation above 700 m/s, large temporary cavity scaling
- cited in 1 question
The Bharatiya Sakshya Adhiniyam, 2023 (Act 47 of 2023), Section 39; Indian Evidence Act, 1872, Section 45
Expert opinion as relevant fact for forensic ballistic range-of-fire evidence in Indian sessions trials; indiacode.nic.in
Open source - cited in 1 question
Heard B J, Handbook of Firearms and Ballistics: Examining and Interpreting Forensic Evidence, 2nd edition, Wiley-Blackwell, 2008
Chapter on External Ballistics: chronograph types and the photo-electric (sky-screen) time-of-flight principle
- cited in 1 question
DiMaio V J M, Gunshot Wounds: Practical Aspects of Firearms, Ballistics, and Forensic Techniques, 3rd edition, CRC Press, 2016
FBI Ammunition Test Protocol: 12 to 18 inch penetration window in 10 percent ordnance gelatin for service handgun cartridges
How our mocks are built
Questions are written and edited by the ForensicSpot team and cited from peer-reviewed forensic textbooks, official syllabi and primary case law. Each one is verified before publishing. Detailed explanations show after you submit, so the test stays a real test. See a mistake? Tell us.
Common questions
What does the Forensic Ballistics: Velocity, Penetration and Wound Ballistics mock cover?+
Medium-band UGC-NET Forensic Science Paper II Unit V drill on muzzle-velocity measurement, terminal energy and wound ballistics. The set opens with the chronograph: sky-screen optical chronographs (start-screen and stop-screen photo-electric triggers), infrared chronographs of the Magnetospeed and ProChrono style, and magnetic-coil chronographs, with the standard 3 metre to 5 metre placement from the muzzle, screen spacing, and environmental corrections for temperature and air density that the e
How many questions and how long is the test?+
30 multiple-choice questions, 30 minutes total. Difficulty: medium. Tier: Premium.
Who is this mock for?+
Forensic science students and aspirants who want timed, exam-style practice with explanations and verified source citations on Forensic Ballistics, NET. Useful for postgraduate entrance preparation and for BSc / MSc forensic students testing their recall under time.
Are the questions reviewed?+
Each question carries a verified source citation. Faculty review for individual questions is in progress.
Do I need an account to take this mock?+
Yes, a free ForensicSpot account is required to start a timed attempt — this lets you save progress, see per-question explanations after submission, and track your topic-level performance over time.