Forensic Chemistry: Fire Tetrahedron and Arson Investigation Basics
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
About this mock
UGC-NET Forensic Science Unit VI drill on fire chemistry and arson investigation fundamentals. Covers the fire tetrahedron (fuel, oxygen, heat, chain reaction) and its superiority over the older fire triangle model, combustion thresholds including flash point, fire point, and autoignition temperature, and the lower and upper flammable limits (LFL and UFL) that define the explosive range of fuel-air mixtures. Heat transfer mechanisms, conduction, convection, and radiation, are examined alongside the critical fire-growth phenomena of flashover and backdraft that are central to fire dynamics analysis under NFPA 921.
The arson investigation module covers incendiary indicators recognised in Kirk's Fire Investigation (DeHaan and Icove, 7th edition), including accelerant pour patterns on floors, trailers, multiple points of origin, and the distinction between deliberate and accidental origin. Burn pattern interpretation, V-patterns, low burns, char depth, alligator charring, and concrete spalling, is tested at the definitional level. The Indian regulatory and medico-legal context addresses Section 80 of the Bharatiya Nyaya Sanhita (BNS) 2023 (formerly IPC 304B on dowry deaths), Section 324 BNS 2023 (formerly IPC 436 on mischief by fire), Modi's Medical Jurisprudence and Toxicology on burn injury classification, and the status of NFPA 921 as a reference standard in Central Forensic Science Laboratory fire investigation.
Topics covered:
- Fire tetrahedron: fuel, heat, oxygen, and chain reaction
- Flash point, fire point, and autoignition temperature
- Lower and upper flammable limits (LFL and UFL)
- Conduction, convection, and radiation heat transfer
- Flashover vs backdraft phenomena
- Incendiary indicators: pour patterns, trailers, multiple origins
- V-patterns, low burns, char depth, and alligator charring
- BNS 2023 Sections 80 and 324; NFPA 921 and CFSL practice
Calibrated for first-pass UGC-NET Forensic Science Paper II preparation and NFSU MSc Forensic Chemistry entrance revision. 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 17 questions
DeHaan, John D. and Icove, David J. — Kirk's Fire Investigation, 7th Edition, Pearson
Chapter 6: Burn Pattern Interpretation — low burns, floor-level char, and accelerant indicators
- cited in 7 questions
NFPA 921 — Guide for Fire and Explosion Investigations, 2024 Edition
Chapter 6: Fire Patterns — spalling, concrete surface indicators, and interpretive limitations
- cited in 2 questions
Saferstein, Richard — Criminalistics: An Introduction to Forensic Science, 12th Edition, Pearson
Chapter on Fire and Explosion Investigation — fire scene documentation and evidence collection protocol
- cited in 2 questions
Bharatiya Nyaya Sanhita, 2023 (Act 45 of 2023), Government of India
Section 324: Mischief by fire or explosive substance; corresponding to IPC 1860 Section 436
Open source - cited in 1 question
Modi, J.P. — Modi's Medical Jurisprudence and Toxicology, 24th Edition, LexisNexis
Chapter on thermal injuries — burn classification, antemortem vs postmortem burns, vital reactions
- cited in 1 question
Sharma, B.R. — Forensic Science in Criminal Investigation and Trials, 5th Edition
Chapter on fire investigation methodology — Indian practice and international reference standards
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 Chemistry: Fire Tetrahedron and Arson Investigation Basics mock cover?+
UGC-NET Forensic Science Unit VI drill on fire chemistry and arson investigation fundamentals. Covers the fire tetrahedron (fuel, oxygen, heat, chain reaction) and its superiority over the older fire triangle model, combustion thresholds including flash point, fire point, and autoignition temperature, and the lower and upper flammable limits (LFL and UFL) that define the explosive range of fuel-air mixtures. Heat transfer mechanisms, conduction, convection, and radiation, are examined alongside
How many questions and how long is the test?+
30 multiple-choice questions, 30 minutes total. Difficulty: easy. 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 Chemistry, 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.