Forensic Physics: Foundations

This mock covers the foundations of Forensic Physics as it appears in the FACT exam syllabus (Section B, Elective I, sub-section i). Thirty questions spread across all eight syllabus sub-topics — physical evidence collection from the scene, the analytical instruments used in the lab (microscopy, UV-Vis, SEM-EDX), pattern evidence (tool marks, glass fractures, paint, fibre, soil), the mathematics and statistics used to interpret results, forensic voice authentication, video analysis, criminalistics and forensic engineering (cement adulteration, nano-tech, arson investigation), and collision investigation and reconstruction.

It is pitched at BSc and first-year MSc forensic science students at NFSU, LNJN-NICFS, and other Indian universities, FACT and FACT Plus aspirants, and UGC-NET candidates who need the Forensic Physics fundamentals locked in before tackling specialised papers. Forensic Physics is the broadest section of the FACT syllabus and the one where most candidates lose marks; this mock sits at the foundational level — vocabulary, definitions, and the most-asked concepts that anchor every later question.

Themes covered:

• Crime-scene first-responder priorities and the panchnama
• Packaging biological vs physical evidence — paper vs plastic
• Chain of custody as a documented audit trail
• Compound, comparison and SEM-EDX microscopy — what each is for
• Beer-Lambert law in UV-Vis spectrophotometry
• Tool marks: impression vs striated; the comparison microscope
• Glass fracture analysis and the 3R rule for direction-of-impact
• Paint chip layer-structure analysis (PDQ)
• Natural vs synthetic fibre identification
• Mean / median / mode / SD; Bayes theorem and the likelihood ratio
• Vocal formants, spectrograms, and forensic speaker identification
• CCTV imaging best practice; de-interlacing; watermarking
• Soil, cement (IS 269), nanotechnology and arson investigation
• Skid marks, drag factor, the v = √(2gμd) speed-from-skid formula
• Hit-and-run vehicle examination and tyre-mark analysis

Each question carries a detailed 220+ word explanation citing standard references (Saferstein, Sharma, NFPA 921, ENFSI guidelines, NIJ Crime Scene Investigation Guide, IS 269 / IS 4031 series, Daily & Strickland on collision reconstruction). Allow 15 minutes; the explanations are long enough to use as study notes by themselves. If you can pass this mock comfortably, you have the FACT Forensic Physics vocabulary that the application-level (Mock #7) and mastery-level (Mocks #8–#10) papers build on.