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Forensic Chemistry: Brisance, VoD, Oxygen Balance and Sensitivity
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
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Practice with national-level exam (FACT, FACT Plus, NET, CUET, etc.) mocks, learn from structured notes, and get your doubts solved in one place.
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
Score, per-question explanations and topic breakdown shown right after you submit.
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UGC-NET Forensic Science Unit VI advanced drill on the physical and thermochemical characterisation of secondary high explosives. Hard-band questions cover detonation velocity (VoD in m/s: HMX 9100, RDX 8750, PETN 8350, TNT 6900, ANFO 3200), brisance measurement by the Trauzl lead-block compression test and the Kast brass cylinder compression test (both derived from the Chapman-Jouguet pressure approximation rho x VoD^2), oxygen balance stoichiometry (OB%% formula, TNT at -74%%, RDX at -21.6%%, PETN at -10.1%%, ANFO near zero), and sensitivity testing by drop-weight impact (J), BAM friction (N), DTA/DSC thermal onset (degrees C), and electrostatic spark (mJ).
Chapman-Jouguet detonation pressure calculations and the Hopkinson-Cranz scaled distance law are tested alongside power index and TNT equivalence values (RDX 1.60x, PETN 1.66x, ANFO 0.74x). Indian regulatory coverage spans UN Class 1 divisions (1.1 mass explosion hazard through 1.6 extremely insensitive) and PESO licensing tiers under the Explosives Act 1884 and Explosives Rules 2008 (Form LE-1 for manufacture, LE-3 for storage, LE-4 for import, LE-7 for road transport). Each question tests one specific numerical or definitional parameter -- distractors differ on a single value, forcing genuine recall rather than elimination.
Topics covered:
Calibrated for UGC-NET Paper II Unit VI top-decile candidates and NFSU MSc Forensic Chemistry entrance examinees. Allow 30 minutes.
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