Give 100 mcqs with answers in the following topics for bbs forensic medicine
Give 100 mcqs with answers in the following topics for bbs forensic medicine 1. Introduction 2. Legal Procedure 3. Medical Law and Ethics 4. Identification 5. Medicolegal Autopsy 6. Death and its Cause 7. Postmortem Changes 8. Mechanical Injuries 9. Regional Injuries • 10. Medicolegal Aspects of Wounds 11. Thermal Deaths 12. Starvation 13. Mechanical Asphyxia 14. Anaesthetic and Operative Deaths 15. Impotence and Sterility 16. Virginity, Pregnancy and Delivery 17. Abortion 18. Sexual Offences 19. Infant Deaths 20. Blood Stains 21. Artefacts 22. Forensic Science Laboratory 23. Forensic Psychiatry SECTION II: TOXICOLOGY 24. General Considerations 498 25. Agricultural Poisons 520 26. Corrosive Poisons 530 27. Metallic Poisons 538 28. Inorganic Irritant Poisons 550 29. Organic Irritant Poisons 554 30. CNS Depressants 568 31. Psychotropic Drugs 593 32. Deliriant Poisons 598 33. Drug Dependence and Abuse 604 34. Spinal Poisons 612 35. Cardiac Poisons 615 36. Asphyxiants 620 37. Miscellaneous Poisons 630 38. Food Poisoning 535
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100 MCQs - BBS Forensic Medicine & Toxicology
SECTION I: FORENSIC MEDICINE
TOPIC 1: Introduction
Q1. The branch of medicine that deals with the application of medical knowledge to legal problems is called:
- A) Forensic pathology
- B) Medical jurisprudence
- C) Forensic medicine
- D) Both B and C
Answer: D - Forensic medicine and medical jurisprudence are used synonymously to describe the application of medical knowledge to legal problems.
Q2. The term "Forensic" is derived from the Latin word "Forensis" which means:
- A) Death
- B) Belonging to the forum/court
- C) Medicine
- D) Science
Answer: B - "Forensic" comes from the Latin "forensis," meaning "of or before the forum" (Roman court of law).
Q3. Which of the following is NOT a branch of forensic medicine?
- A) Forensic pathology
- B) Forensic psychiatry
- C) Forensic pharmacology
- D) Forensic odontology
Answer: C - Forensic pharmacology is not a recognized branch; the standard branches include forensic pathology, forensic psychiatry, forensic odontology, forensic anthropology, and forensic toxicology.
Q4. The father of forensic medicine is considered to be:
- A) Rudolf Virchow
- B) Paul Brouardel
- C) Ambroise Pare
- D) Fortunato Fidelis
Answer: D - Fortunato Fidelis (1550-1630) of Italy is considered the father of forensic medicine; he wrote the first systematic work on legal medicine.
TOPIC 2: Legal Procedure
Q5. A First Information Report (FIR) is registered for which class of offence?
- A) Bailable offence
- B) Cognizable offence
- C) Non-cognizable offence
- D) Compoundable offence
Answer: B - FIR is registered for cognizable offences, where police can arrest without a warrant.
Q6. A dying declaration is admissible as evidence under which section of the Indian Evidence Act?
- A) Section 30
- B) Section 32
- C) Section 45
- D) Section 302
Answer: B - Section 32 of the Indian Evidence Act deals with statements made by a person who is dead, including dying declarations.
Q7. The document used to preserve the opinion of a medical expert who cannot attend court is called:
- A) Inquest report
- B) Post-mortem certificate
- C) Commission
- D) Deposition
Answer: C - A commission is a formal document recording evidence of a witness (including a doctor) who cannot appear in court personally.
Q8. Inquest under Section 174 CrPC is conducted by:
- A) Magistrate
- B) Police officer
- C) Civil surgeon
- D) District judge
Answer: B - Section 174 CrPC inquest is conducted by the police (sub-inspector or above) for apparently unnatural deaths.
TOPIC 3: Medical Law and Ethics
Q9. The doctrine of "Res ipsa loquitur" means:
- A) Let the patient speak
- B) The thing speaks for itself
- C) Doctor is always right
- D) Patient assumes risk
Answer: B - "Res ipsa loquitur" (Latin: "the thing speaks for itself") is used in negligence cases where the event itself implies negligence without need for detailed proof.
Q10. Professional misconduct by a doctor in India is regulated by:
- A) IPC
- B) MCI/NMC
- C) State government
- D) Supreme Court
Answer: B - The National Medical Commission (NMC, formerly MCI) regulates professional conduct of doctors in India under the NMC Act 2019.
Q11. A doctor who treats a patient without valid consent can be charged with:
- A) Defamation
- B) Assault and battery
- C) Fraud
- D) Negligence only
Answer: B - Treatment without consent constitutes assault (threat) and battery (unlawful touching), both civil and criminal wrongs.
Q12. The principle of "Volenti non fit injuria" means:
- A) No negligence without proof
- B) Consent negates wrongfulness
- C) Doctor bears full liability
- D) Patient has no rights
Answer: B - "Volenti non fit injuria" means "to a willing person, no injury is done" - valid consent removes the wrongful nature of an act.
TOPIC 4: Identification
Q13. The most reliable method of identification of an individual is:
- A) Fingerprinting
- B) DNA profiling
- C) Bertillon system
- D) Dental records
Answer: B - DNA profiling (DNA fingerprinting) is currently the most reliable and individualistic method of identification.
Q14. Galton's details in fingerprinting refer to:
- A) Ridge count
- B) Ridge characteristics (minutiae)
- C) Palm patterns
- D) Loops and whorls
Answer: B - Galton's details or minutiae are the individual ridge characteristics (bifurcations, endings, dots, islands) used for fingerprint comparison.
Q15. The number of Galton's details required for fingerprint identification in India is:
- A) 8
- B) 10
- C) 12
- D) 16
Answer: C - In India, at least 12 matching Galton's details (points of similarity) are required for positive fingerprint identification.
Q16. Which of the following is used to develop latent fingerprints on paper?
- A) Aluminum powder
- B) Ninhydrin
- C) Mercury powder
- D) Osmium tetroxide
Answer: B - Ninhydrin reacts with amino acids in sweat to develop latent fingerprints on porous surfaces like paper, producing a purple color (Ruhemann's purple).
Q17. The age of a person can be estimated from teeth by:
- A) Gustafson's method
- B) Bertillon's method
- C) Locard's method
- D) Galton's method
Answer: A - Gustafson's method estimates age from teeth by examining six dental criteria: attrition, secondary dentine, cementum apposition, root resorption, periodontosis, and root transparency.
TOPIC 5: Medicolegal Autopsy
Q18. The primary purpose of a medicolegal (forensic) autopsy is to:
- A) Train medical students
- B) Determine the cause of death for legal purposes
- C) Research purposes only
- D) Satisfy the family's curiosity
Answer: B - A medicolegal autopsy determines the cause, manner, and circumstances of death for legal and judicial purposes.
Q19. In India, who has the authority to order a postmortem examination?
- A) Any doctor
- B) Family members
- C) Magistrate or police officer
- D) Hospital administrator
Answer: C - A magistrate (under Section 176 CrPC) or police officer (under Section 174 CrPC) can order a postmortem examination in medicolegal cases.
Q20. The "Y-shaped" incision in autopsy is made to expose:
- A) Brain
- B) Thorax and abdomen
- C) Neck organs
- D) Extremities
Answer: B - The standard Y-shaped (or I-shaped) incision runs from each shoulder to the sternum and then down the midline to the pubis, exposing the thorax and abdomen.
TOPIC 6: Death and Its Cause
Q21. Brain death is characterized by:
- A) Flat EEG for at least 30 minutes
- B) Irreversible cessation of all brain functions including brainstem
- C) Absence of cardiac activity
- D) Loss of consciousness only
Answer: B - Brain death is defined as the irreversible cessation of all functions of the entire brain including the brainstem, confirmed by clinical and often confirmatory tests.
Q22. The most common cause of sudden natural death in adults is:
- A) Pulmonary embolism
- B) Ischemic heart disease
- C) Stroke
- D) Ruptured aortic aneurysm
Answer: B - Ischemic heart disease (coronary artery disease with myocardial infarction) is the most common cause of sudden natural death in adults.
Q23. "Somatic death" refers to:
- A) Death of individual cells
- B) Death of the whole organism
- C) Death of a specific organ
- D) Brain death only
Answer: B - Somatic (clinical) death is the death of the organism as a whole, marked by cessation of heartbeat, breathing, and brain function.
Q24. Manner of death "NASH" classification includes:
- A) Natural, Accidental, Suicide, Homicide
- B) Natural, Asphyxia, Strangulation, Hanging
- C) Negligence, Accident, Suicide, Homicide
- D) Natural, Asphyxia, Stab, Hanging
Answer: A - NASH stands for Natural, Accidental, Suicide, Homicide - the four primary manners of death in medicolegal classification.
TOPIC 7: Postmortem Changes
Q25. Postmortem lividity (livor mortis) begins to appear after death at:
- A) 30 minutes - 3 hours
- B) 6-8 hours
- C) 10-12 hours
- D) 24 hours
Answer: A - Livor mortis begins to appear within 30 minutes to 3 hours after death as blood settles in dependent parts.
Q26. Postmortem lividity becomes FIXED (non-shiftable) at:
- A) 2-4 hours
- B) 6-12 hours
- C) 24-48 hours
- D) 72 hours
Answer: B - Livor mortis becomes fixed and non-shiftable by 6-12 hours after death due to hemolysis and diffusion of hemoglobin into tissues.
Q27. Rigor mortis begins in which muscles first?
- A) Leg muscles
- B) Muscles of mastication and small muscles of the face/jaw
- C) Abdominal muscles
- D) Hand muscles
Answer: B - Rigor mortis follows Nysten's law: it starts in the muscles of mastication and eyelids (small facial muscles), then progresses downward.
Q28. The chemical basis of rigor mortis is:
- A) Depletion of ATP and accumulation of lactic acid
- B) Accumulation of calcium
- C) Increase in sodium
- D) Depletion of glycogen only
Answer: A - After death, ATP production ceases; without ATP, actin-myosin cross-bridges cannot be broken, causing sustained muscle contraction. Accumulation of lactic acid from anaerobic glycolysis and depletion of ATP are the key mechanisms.
Q29. The order of putrefactive color change in the skin is:
- A) Green → black → brown
- B) Green → brown → black
- C) Brown → green → black
- D) Black → green → brown
Answer: A - Putrefaction first causes green discoloration (right iliac fossa, due to H2S + Hb = sulfhemoglobin), then spreads and darkens to brown/black as marbling appears.
Q30. Adipocere formation is caused by:
- A) Mummification in dry heat
- B) Saponification of body fat in moist conditions
- C) Freezing of the body
- D) Embalming
Answer: B - Adipocere is the soap-like waxy substance formed by saponification (hydrolysis and hydrogenation) of body fat in moist, warm, anaerobic conditions. Calcium and magnesium soaps are formed.
TOPIC 8: Mechanical Injuries
Q31. An abrasion is best defined as:
- A) Disruption of full thickness of skin
- B) Superficial injury limited to the epidermis or papillary dermis
- C) Tear in underlying tissue
- D) Bruise without skin breach
Answer: B - An abrasion (graze) is a superficial injury involving loss of epidermis or superficial dermis due to friction or pressure, without full-thickness skin disruption.
Q32. The most important medicolegal significance of abrasion is:
- A) It is always fatal
- B) It indicates the site and direction of force application
- C) It is always self-inflicted
- D) It heals with scar formation
Answer: B - Abrasions indicate the site of application of force; scratch abrasions show direction from shallow to deep end; they may show patterned marks reproducing the causative object.
Q33. A contusion (bruise) is caused by:
- A) Laceration of blood vessels
- B) Rupture of small blood vessels without break in skin surface
- C) Puncture of skin
- D) Burns to the skin
Answer: B - A contusion results from blunt trauma causing rupture of small blood vessels (capillaries and venules) with extravasation of blood into tissue without skin breach.
Q34. The color of a bruise changes over time in the following order:
- A) Red-blue → blue-black → green → yellow → normal
- B) Yellow → green → blue → red
- C) Black → red → green → yellow
- D) Blue → yellow → green → red
Answer: A - Bruise color evolution: red-blue (fresh) → blue-black (hours to days) → greenish (3-5 days, biliverdin) → yellow (5-7 days, bilirubin) → normal skin color.
Q35. A laceration differs from an incised wound in that:
- A) Lacerations are caused by sharp objects
- B) Lacerations show bridging strands across the wound gap
- C) Incised wounds bleed more
- D) Lacerations are always deeper
Answer: B - Lacerations (caused by blunt force) characteristically show bridging of nerves, blood vessels, and connective tissue across the wound, whereas incised wounds (sharp force) have clean-cut edges with no such bridges.
TOPIC 9: Regional Injuries
Q36. Coup-contrecoup injuries are characteristically seen in injuries to:
- A) Chest
- B) Abdomen
- C) Head
- D) Extremities
Answer: C - Coup-contrecoup injuries occur in head injuries: coup injury is at the site of impact, contrecoup injury is at the diametrically opposite pole due to brain movement within the skull.
Q37. Ring fracture of the base of skull is seen in:
- A) Fall on feet from height
- B) Gunshot wound
- C) Strangulation
- D) Direct blow to the temple
Answer: A - Ring fracture (circular fracture around foramen magnum) is characteristically seen when a person falls from height and lands on their feet or buttocks, with the force transmitted upward through the spine.
Q38. "Love bite" is medicolegally significant as evidence of:
- A) Starvation
- B) Sexual assault
- C) Child abuse
- D) Accidental injury
Answer: B - Love bites (suction ecchymoses/bite marks on neck, breast, thighs) are important in cases of sexual assault and rape as evidence of the assault.
TOPIC 10: Medicolegal Aspects of Wounds
Q39. A wound that is inflicted after death is called:
- A) Antemortem wound
- B) Perimortem wound
- C) Postmortem wound (artifact)
- D) Defense wound
Answer: C - A postmortem wound/artefact is inflicted after death; it lacks vital reaction (no bleeding, no inflammation, no bruising at margins).
Q40. Defense wounds are characteristically seen on:
- A) Scalp
- B) Forearms and hands (ulnar border)
- C) Chest
- D) Back
Answer: B - Defense wounds result from the victim raising their arms to protect themselves; they are typically seen on the ulnar border of the forearms and dorsum/palmar surface of the hands.
Q41. The "hesitation cuts" or "tentative wounds" are characteristically seen in:
- A) Homicide
- B) Accidental injury
- C) Suicide
- D) Road traffic accidents
Answer: C - Hesitation (tentative/trial) cuts are superficial, multiple, parallel incisions near the fatal wound, characteristically seen in suicidal sharp force injuries as the person "tests" before making the fatal cut.
TOPIC 11: Thermal Deaths
Q42. The pugilistic attitude (boxer's posture) seen in burned bodies is due to:
- A) Vital reaction
- B) Coagulation and shortening of muscle proteins
- C) Rigor mortis
- D) Postmortem artifact from handling
Answer: B - The pugilistic attitude is caused by the heat-induced coagulation and shortening of muscle proteins (especially the larger flexor muscles), pulling the body into a flexed, fist-raised posture. It is a postmortem change and does NOT indicate antemortem activity.
Q43. Heat stroke occurs when core body temperature exceeds:
- A) 37°C
- B) 38.5°C
- C) 40°C
- D) 42°C
Answer: C - Heat stroke is defined by a core body temperature exceeding 40°C (104°F) with central nervous system dysfunction, caused by failure of thermoregulation.
Q44. "Crocodile skin" appearance in burn victims refers to:
- A) Third-degree burns
- B) Splitting of burnt skin into rectangular plates (postmortem heat artifact)
- C) Keloid formation
- D) Infected burn wound
Answer: B - "Crocodile skin" or "crocodile leather" appearance is a postmortem heat artifact where the skin splits into rectangular plates due to intense heat; it does NOT indicate the cause of death.
Q45. Which of the following is a sign of death by burning (antemortem)?
- A) Pugilistic attitude
- B) Presence of carbon monoxide in blood (>10% carboxyhemoglobin)
- C) Charring of bones
- D) Heat rupture of skin
Answer: B - Elevated carboxyhemoglobin (>10%) in blood is a vital reaction confirming the person was alive and breathing during the fire. Other antemortem signs include soot in airways and lungs, vital reaction in burns (erythema, vesicles).
TOPIC 12: Starvation
Q46. Death from starvation in an average adult occurs after approximately:
- A) 7-10 days without water
- B) 3-4 weeks without food (with water)
- C) 60-70 days without food (with water)
- D) 10 days without food
Answer: C - With adequate water, death from starvation usually occurs after 60-70 days in adults (range: 50-100 days depending on body reserves). Without water, death occurs in 3-7 days.
Q47. A postmortem finding characteristic of starvation is:
- A) Fatty liver
- B) Extreme emaciation with absence of body fat and muscle wasting
- C) Pulmonary edema
- D) Splenomegaly
Answer: B - Starvation is characterized at autopsy by extreme emaciation (loss of subcutaneous fat, muscle wasting), atrophy of organs, brown atrophy of the heart, serous atrophy of fat, and empty GI tract.
TOPIC 13: Mechanical Asphyxia
Q48. The classic triad of asphyxia signs at autopsy is:
- A) Petechiae, cyanosis, congestion
- B) Petechiae, cyanosis, lividity
- C) Petechiae, cyanosis, fluidity of blood
- D) Petechiae, cyanosis, edema
Answer: C - The classic Tardieu's triad of asphyxia includes: petechial hemorrhages (Tardieu's spots), cyanosis, and fluidity/dark color of blood (due to deoxygenation and CO2 buildup).
Q49. In hanging, the ligature mark is characteristically:
- A) Horizontal, complete, at the level of thyroid cartilage
- B) Oblique, incomplete (open), situated above the thyroid cartilage
- C) Horizontal, complete, below the thyroid cartilage
- D) Vertical, complete
Answer: B - In typical hanging, the ligature mark is oblique (running upward toward the point of suspension), incomplete (with a gap at the point of suspension), and situated above the thyroid cartilage at the level of/just below the chin.
Q50. In homicidal strangulation by ligature, the ligature mark is:
- A) Oblique and incomplete
- B) Horizontal, complete, at or below the thyroid cartilage
- C) Diagonal with gap
- D) Similar to hanging
Answer: B - In ligature strangulation (homicide), the mark is typically horizontal, complete (360°), and situated at the level of or below the thyroid cartilage, unlike hanging where it is oblique and incomplete.
Q51. "Café coronary" refers to:
- A) Sudden cardiac death in a café
- B) Sudden death due to choking on a food bolus (café-type setting)
- C) Alcohol-related cardiac death
- D) Coronary spasm in middle-aged men
Answer: B - Café coronary is sudden death due to food bolus (usually meat) obstructing the upper airway/larynx (mechanical asphyxia), typically occurring during a meal, mimicking a cardiac event.
Q52. In drowning, "washerwoman's hands" refers to:
- A) A sign of prolonged immersion - maceration of palms and soles
- B) Defense wounds
- C) Sign of strangulation
- D) Postmortem artifact
Answer: A - Washerwoman's hands (also called "maceration" or "degloving") is a sign of prolonged immersion in water; the skin of palms and soles becomes pale, wrinkled, and may eventually detach.
TOPIC 14: Anaesthetic and Operative Deaths
Q53. The most common cause of death during anesthesia induction is:
- A) Malignant hyperthermia
- B) Anaphylaxis to anesthetic agents
- C) Aspiration of gastric contents (Mendelson's syndrome)
- D) Cardiac arrhythmia
Answer: C - Aspiration of gastric contents (Mendelson's syndrome) and related pulmonary complications are among the leading causes of anesthetic death, especially if NPO guidelines are not followed.
Q54. Malignant hyperthermia during anesthesia is associated with which drug?
- A) Propofol
- B) Succinylcholine and halothane
- C) Midazolam
- D) Fentanyl
Answer: B - Malignant hyperthermia is a pharmacogenetic disorder triggered by volatile halogenated anesthetics (halothane, sevoflurane) and succinylcholine, causing uncontrolled skeletal muscle metabolism.
TOPIC 15: Impotence and Sterility
Q55. The legal age of sexual consent for males in India is:
- A) 16 years
- B) 18 years
- C) 21 years
- D) No specific age
Answer: B - Under the POCSO Act and IPC, the age of consent in India is 18 years for both males and females.
Q56. Organic (absolute) impotence in males can be caused by:
- A) Performance anxiety
- B) Bilateral orchidectomy (castration)
- C) Psychogenic factors
- D) Temporary illness
Answer: B - Bilateral orchidectomy (removal of both testes) causes absolute/organic impotence due to loss of testosterone and spermatogenesis; this is a permanent, irreversible condition.
TOPIC 16: Virginity, Pregnancy, and Delivery
Q57. The hymen that heals completely after rupture is called:
- A) Annular hymen
- B) Elastic hymen
- C) Parous introitus
- D) Imperforate hymen
Answer: B - An elastic (fimbriated or redundant) hymen can stretch during intercourse without tearing, or can heal after minor injury; its presence does not confirm virginity.
Q58. Gravid uterus becomes palpable above the pubic symphysis at approximately:
- A) 6 weeks
- B) 10 weeks
- C) 12 weeks
- D) 16 weeks
Answer: C - The uterus rises above the pubic symphysis and becomes palpable abdominally at about 12 weeks of gestation.
Q59. Quickening (first fetal movements felt by mother) occurs at:
- A) 10-12 weeks
- B) 16-18 weeks (primigravida) / 14-16 weeks (multigravida)
- C) 20-22 weeks
- D) 24 weeks
Answer: B - Quickening is first felt at about 16-18 weeks in primigravidas and 14-16 weeks in multigravidas.
TOPIC 17: Abortion
Q60. Under the Medical Termination of Pregnancy (MTP) Act 1971 (amended 2021) in India, pregnancy can be terminated up to __ weeks by a single registered medical practitioner:
- A) 12 weeks
- B) 20 weeks
- C) 24 weeks
- D) 28 weeks
Answer: B - Under the MTP (Amendment) Act 2021, a single RMP can terminate pregnancy up to 20 weeks; termination between 20-24 weeks requires two RMPs' opinion (for special categories).
Q61. Criminal abortion (illegal) most commonly leads to death due to:
- A) Air embolism
- B) Septicemia and hemorrhage
- C) Uterine rupture alone
- D) Anaphylaxis
Answer: B - Septicemia (from introduction of septic instruments/substances) and hemorrhage are the two most common causes of death from criminal (illegal) abortion.
Q62. Which instrument is most commonly used in criminal abortion and causes characteristic injuries?
- A) Curette
- B) Stick, catheter, or knitting needle
- C) Suction cannula
- D) Dilator
Answer: B - Common criminal abortion instruments include sticks, catheter tubes, knitting needles, and other improvised instruments, causing uterine perforation, cervical tears, and infection.
TOPIC 18: Sexual Offences
Q63. Under the Indian Penal Code (IPC) Section 375/376 (amended 2013), rape is defined as penile penetration without consent. The minimum age for statutory rape in India is:
- A) 16 years
- B) 18 years
- C) 14 years
- D) 21 years
Answer: B - Statutory rape applies when the victim is below 18 years of age; consent is legally irrelevant below this age.
Q64. The most important medical finding to collect in a rape case is:
- A) Hymenal tear only
- B) Semen/spermatozoa from vaginal swabs for DNA analysis
- C) Bruising of the face
- D) Blood alcohol level
Answer: B - Semen and spermatozoa from vaginal, cervical, or other swabs for DNA profiling is the most important evidence in a rape case; it can positively identify the perpetrator.
Q65. Sodomy refers to:
- A) Oral sex
- B) Anal intercourse
- C) Bestiality
- D) Voyeurism
Answer: B - Sodomy specifically refers to anal intercourse (per anum coitus); it is an unnatural sexual offense under IPC Section 377.
TOPIC 19: Infant Deaths
Q66. The best evidence of a live birth is:
- A) Presence of vernix caseosa
- B) Lung float test (hydrostatic test) - lungs float in water
- C) Umbilical cord present
- D) Presence of meconium
Answer: B - The hydrostatic (lung float) test (Raygat's/Breslau's test): lungs that have been aerated float in water (specific gravity < 1.0), indicating the child breathed air, thus was born alive.
Q67. Infanticide is defined as the killing of a newborn by:
- A) Any person
- B) A mother of an infant under 12 months who is disturbed by effects of childbirth/lactation
- C) Father of the child
- D) Medical personnel
Answer: B - The Infanticide Act defines infanticide as killing of a child under 12 months by its mother while the balance of her mind is disturbed by the effect of giving birth or lactation (reducing the charge from murder to manslaughter/culpable homicide).
Q68. The most common method of infanticide is:
- A) Drowning
- B) Burning
- C) Smothering (suffocation)
- D) Poisoning
Answer: C - Smothering (covering the mouth and nose, suffocation) is the most common method used in infanticide, as it leaves minimal physical evidence.
TOPIC 20: Blood Stains
Q69. The Kastle-Meyer (phenolphthalein) test is used for:
- A) Identification of semen
- B) Presumptive test for blood
- C) Identification of saliva
- D) DNA extraction
Answer: B - The Kastle-Meyer test (phenolphthalein + hydrogen peroxide) is a sensitive presumptive (screening) test for blood; a pink color change suggests presence of blood.
Q70. The confirmatory test for human blood is:
- A) Benzidine test
- B) Luminol test
- C) Precipitin (Ouchterlony) test
- D) Crystal test
Answer: C - The precipitin test (Uhlenhuth's/Ouchterlony test) uses specific anti-human antibodies to confirm that blood is of human origin; it is the gold standard confirmatory test for human blood.
Q71. ABO blood group antigen is found in:
- A) Red blood cells only
- B) All body secretions in secretors (semen, saliva, sweat)
- C) Serum only
- D) White blood cells only
Answer: B - In secretors (approximately 80% of the population), ABO antigens are found in all body fluids and secretions including saliva, semen, vaginal fluid, and sweat, allowing blood grouping from these samples.
TOPIC 21: Artefacts
Q72. Postmortem animal activity on a corpse is called:
- A) Putrefaction
- B) Scavenging (predation artefact)
- C) Adipocere
- D) Mummification
Answer: B - Postmortem animal activity (by rodents, dogs, birds, insects) is termed scavenging or predation artefact; it can simulate antemortem injuries and cause confusion in medicolegal cases.
Q73. Artefacts produced during resuscitation (CPR) include:
- A) Rib fractures and sternal fractures
- B) Subdural hematoma
- C) Petechial hemorrhages
- D) Aspiration of foreign material only
Answer: A - CPR-related artefacts commonly include rib fractures (especially in the elderly), sternal fractures, liver lacerations, and cardiac contusions, which can simulate traumatic injury.
TOPIC 22: Forensic Science Laboratory
Q74. The Locard's exchange principle states:
- A) Every contact leaves a trace
- B) DNA is unique to every individual
- C) Fingerprints never change
- D) Blood types are inherited
Answer: A - Edmond Locard's exchange principle: "Every contact leaves a trace" - whenever two objects come into contact, material is exchanged between them, forming the basis of trace evidence analysis.
Q75. Gas chromatography-mass spectrometry (GC-MS) is considered the "gold standard" in forensic toxicology for:
- A) Screening only
- B) Identification and quantification of drugs and poisons
- C) DNA analysis
- D) Fingerprint analysis
Answer: B - GC-MS is the definitive confirmatory test in forensic toxicology for identification and quantification of drugs, poisons, and their metabolites in biological samples.
TOPIC 23: Forensic Psychiatry
Q76. The legal test for insanity in India (McNaughton rules) requires:
- A) Presence of any mental illness
- B) At the time of the act, not knowing the nature of the act OR not knowing it was wrong, due to a disease of the mind
- C) History of psychiatric hospitalization
- D) Diagnosis of schizophrenia
Answer: B - The McNaughton (M'Naghten) rules state a person is not criminally responsible if, at the time of committing the act, due to a disease of the mind, they did not know the nature and quality of the act, or did not know it was wrong.
Q77. Testamentary capacity refers to the ability to:
- A) Stand trial in court
- B) Make a valid will
- C) Give informed consent for surgery
- D) Manage one's financial affairs
Answer: B - Testamentary capacity is the legal and mental ability to make a valid will; the testator must understand the nature of making a will, the extent of their property, and the natural heirs.
SECTION II: TOXICOLOGY
TOPIC 24: General Considerations
Q78. The "therapeutic window" refers to:
- A) The time frame for treating poisoning
- B) The range of drug concentration between minimum effective dose and minimum toxic dose
- C) The maximum safe dose of any drug
- D) The route of drug administration
Answer: B - The therapeutic window (therapeutic index) is the range between the minimum effective concentration (MEC) and the minimum toxic concentration (MTC) of a drug.
Q79. The antidote for paracetamol (acetaminophen) poisoning is:
- A) Atropine
- B) N-acetylcysteine (NAC)
- C) Flumazenil
- D) Naloxone
Answer: B - N-acetylcysteine (NAC) is the specific antidote for paracetamol toxicity; it replenishes hepatic glutathione, preventing binding of toxic NAPQI to hepatic proteins.
TOPIC 25: Agricultural Poisons
Q80. Organophosphate poisoning classically produces which clinical syndrome?
- A) Sympathomimetic (sympathetic) syndrome
- B) Cholinergic crisis (DUMBELS / SLUDGE)
- C) Anticholinergic syndrome
- D) Serotonin syndrome
Answer: B - Organophosphate compounds inhibit acetylcholinesterase, causing accumulation of acetylcholine at all cholinergic synapses, producing SLUDGE (Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis) or DUMBELS.
Q81. The specific antidote for organophosphate poisoning is:
- A) Pralidoxime (2-PAM) AND atropine
- B) Atropine alone
- C) Diazepam
- D) Naloxone
Answer: A - Treatment of OP poisoning requires BOTH atropine (to block muscarinic effects) AND pralidoxime/2-PAM (to reactivate cholinesterase before "aging"); atropine alone is insufficient.
Q82. Aluminum phosphide (Celphos/rice tablet) poisoning is characterized by:
- A) Garlic odor and cardiovascular collapse
- B) Cherry red color of blood
- C) Miosis and bradycardia
- D) Metabolic alkalosis
Answer: A - Aluminum phosphide releases phosphine gas (PH3) with a garlic/decaying fish odor; it causes multiorgan failure, cardiovascular collapse (direct cardiotoxicity), and has very high mortality. There is NO specific antidote.
TOPIC 26: Corrosive Poisons
Q83. Carbolic acid (phenol) poisoning is characterized by:
- A) White eschar with putty/paste texture and a distinctive sweet/tar-like odor
- B) Black eschar with garlic smell
- C) Yellow staining of tissues
- D) Frothy secretions
Answer: A - Carbolic acid (phenol) produces a white/grey coagulative eschar with a characteristic sweet, tarry (carbolic) odor; it causes rapid systemic absorption leading to CNS depression and cardiac arrhythmias.
Q84. Oxalic acid is found naturally in which common food plant?
- A) Tomato
- B) Spinach and rhubarb
- C) Potato leaves
- D) Onion
Answer: B - Oxalic acid occurs naturally in spinach, rhubarb, sorrel, and wood sorrel; it precipitates calcium as insoluble calcium oxalate crystals, causing hypocalcemia and renal tubular damage.
TOPIC 27: Metallic Poisons
Q85. Lead poisoning (plumbism) characteristically produces which finding in the mouth?
- A) Black staining of teeth
- B) Burton's line (bluish-black line on gum margin)
- C) White patches on tongue
- D) Yellow discoloration of gums
Answer: B - Burton's line is a characteristic bluish-black line at the gingival margin (especially near carious teeth) caused by deposition of lead sulfide, seen in chronic lead poisoning.
Q86. The most sensitive indicator of lead exposure is:
- A) Blood lead level
- B) Urinary coproporphyrin
- C) Basophilic stippling of RBCs
- D) X-ray lead lines in long bones
Answer: A - Blood lead level (BLL) is the most direct and sensitive indicator of recent lead exposure; a BLL >10 μg/dL (in children) or >25 μg/dL (in adults) indicates significant exposure.
Q87. The antidote for arsenic poisoning is:
- A) BAL (British Anti-Lewisite / Dimercaprol)
- B) EDTA
- C) N-acetylcysteine
- D) Atropine
Answer: A - BAL (dimercaprol) is the classic antidote for arsenic, mercury, gold, and lead poisoning; it chelates the heavy metal. DMSA (succimer) is now preferred as a safer oral alternative.
TOPIC 28: Inorganic Irritant Poisons
Q88. Cyanide poisoning causes death by:
- A) Hemolysis
- B) Histotoxic hypoxia (inhibition of cytochrome oxidase)
- C) Methemoglobin formation
- D) Liver failure
Answer: B - Cyanide binds to cytochrome c oxidase (Complex IV of mitochondrial electron transport chain), causing histotoxic (cytotoxic) hypoxia - cells cannot use oxygen despite normal oxygen delivery. Blood is bright red.
TOPIC 29: Organic Irritant Poisons
Q89. Cantharides (Spanish fly) poisoning characteristically produces:
- A) Renal irritation and priapism
- B) Hepatic failure
- C) CNS depression
- D) Cardiac arrhythmia
Answer: A - Cantharidin (from blister beetles) produces intense irritation of the urinary tract (burning urination, priapism, hematuria, nephritis); it was historically used as an aphrodisiac but is highly toxic.
TOPIC 30: CNS Depressants
Q90. The lethal blood alcohol concentration (BAC) in non-tolerant individuals is approximately:
- A) 100 mg/dL
- B) 200 mg/dL
- C) 300 mg/dL
- D) 400-500 mg/dL and above
Answer: D - Death from alcohol intoxication typically occurs at BAC above 400-500 mg/dL (0.4-0.5%) in non-tolerant individuals; though with tolerance, death may occur at higher levels.
Q91. Barbiturate poisoning is characterized by:
- A) Miosis, bradycardia, coma
- B) CNS depression, respiratory depression, hypotension, hypothermia
- C) Excitement then depression
- D) Anticholinergic features
Answer: B - Barbiturate poisoning causes generalized CNS depression, respiratory depression (leading cause of death), hypotension, hypothermia, and coma. There is NO specific antidote; management is supportive.
Q92. The antidote for benzodiazepine overdose is:
- A) Naloxone
- B) Flumazenil
- C) Physostigmine
- D) N-acetylcysteine
Answer: B - Flumazenil is the specific competitive antagonist at benzodiazepine receptors (GABA-A receptor BZD site); it rapidly reverses benzodiazepine-induced sedation and respiratory depression.
TOPIC 31: Psychotropic Drugs
Q93. Cannabis (marijuana) active ingredient is:
- A) Mescaline
- B) Delta-9-tetrahydrocannabinol (THC)
- C) Lysergic acid diethylamide (LSD)
- D) Cocaine
Answer: B - The principal psychoactive constituent of Cannabis sativa is delta-9-tetrahydrocannabinol (THC), which acts on CB1 and CB2 cannabinoid receptors.
TOPIC 32: Deliriant Poisons
Q94. Atropine (belladonna/Datura) poisoning classically produces:
- A) "Hot as a hare, blind as a bat, dry as a bone, red as a beet, mad as a hatter"
- B) Miosis, lacrimation, salivation
- C) CNS depression and respiratory arrest
- D) Garlic odor and GI bleeding
Answer: A - The classic mnemonic for anticholinergic (atropine/belladonna) toxidrome: Hot (hyperthermia), Blind (mydriasis/cycloplegia), Dry (anhidrosis, dry mouth), Red (flushing), Mad (delirium/hallucinations).
TOPIC 33: Drug Dependence and Abuse
Q95. Which opioid is used for maintenance therapy in heroin addiction?
- A) Naloxone
- B) Methadone
- C) Naltrexone
- D) Buprenorphine alone
Answer: B - Methadone (long-acting opioid agonist) is the classic maintenance therapy for heroin (opioid) dependence; buprenorphine/naloxone (Suboxone) is also widely used.
Q96. "Track marks" in a drug addict refer to:
- A) Bruising from fights
- B) Linear scars/pigmentation along veins from repeated intravenous injections
- C) Tattoos
- D) Insect bite marks
Answer: B - Track marks are linear scars, pigmentation, or fibrosis along the course of superficial veins (especially antecubital fossae) caused by repeated intravenous drug injection.
TOPIC 34: Spinal Poisons
Q97. Strychnine poisoning is characterized by:
- A) Flaccid paralysis
- B) Generalized convulsions with opisthotonus, triggered by sensory stimuli
- C) CNS depression
- D) Slow onset GI symptoms
Answer: B - Strychnine blocks glycine receptors in the spinal cord, causing exaggerated reflexes and violent generalized tetanic convulsions (opisthotonus - arching of back), easily triggered by any sensory stimulus (light, noise, touch). Death is from respiratory failure during a convulsion.
TOPIC 35: Cardiac Poisons
Q98. Aconite poisoning (Aconitum ferox - Bikh/Vatsnabh) characteristically produces:
- A) Burning sensation in mouth, paresthesias, bradycardia, and hypotension
- B) Hepatic failure
- C) Renal failure
- D) Anticholinergic syndrome
Answer: A - Aconitine (alkaloid from Aconitum species) causes intense burning in the mouth and throat, tingling/paresthesias spreading to the whole body, bradycardia, cardiac arrhythmias, hypotension, and respiratory paralysis. It acts on voltage-gated sodium channels.
TOPIC 36: Asphyxiants
Q99. Carbon monoxide (CO) poisoning produces which characteristic finding at autopsy?
- A) Dark brown blood and cyanosis
- B) Cherry-red/bright pink lividity and cherry-red blood (carboxyhemoglobin)
- C) Yellow skin
- D) Black viscera
Answer: B - CO binds hemoglobin with 240x greater affinity than O2 forming carboxyhemoglobin (COHb), which is bright cherry-red; this produces the characteristic cherry-red lividity, blood, and muscle color at autopsy.
TOPIC 37: Miscellaneous Poisons / Food Poisoning
Q100. The most common cause of bacterial food poisoning in India is:
- A) Clostridium botulinum
- B) Staphylococcus aureus and Salmonella species
- C) Vibrio cholerae
- D) Listeria monocytogenes
Answer: B - Staphylococcus aureus (preformed heat-stable enterotoxin, rapid onset 1-6 hours) and Salmonella species (Salmonella enteritidis/typhimurium, 8-48 hours onset) are the most common causes of bacterial food poisoning in India.
Summary Table
| Q# | Topic | Answer |
|---|---|---|
| 1 | Introduction | D |
| 2 | Introduction | B |
| 3 | Introduction | C |
| 4 | Introduction | D |
| 5 | Legal Procedure | B |
| 6 | Legal Procedure | B |
| 7 | Legal Procedure | C |
| 8 | Legal Procedure | B |
| 9 | Med Law & Ethics | B |
| 10 | Med Law & Ethics | B |
| 11 | Med Law & Ethics | B |
| 12 | Med Law & Ethics | B |
| 13 | Identification | B |
| 14 | Identification | B |
| 15 | Identification | C |
| 16 | Identification | B |
| 17 | Identification | A |
| 18 | ML Autopsy | B |
| 19 | ML Autopsy | C |
| 20 | ML Autopsy | B |
| 21 | Death & Cause | B |
| 22 | Death & Cause | B |
| 23 | Death & Cause | B |
| 24 | Death & Cause | A |
| 25 | PM Changes | A |
| 26 | PM Changes | B |
| 27 | PM Changes | B |
| 28 | PM Changes | A |
| 29 | PM Changes | A |
| 30 | PM Changes | B |
| 31 | Mech Injuries | B |
| 32 | Mech Injuries | B |
| 33 | Mech Injuries | B |
| 34 | Mech Injuries | A |
| 35 | Mech Injuries | B |
| 36 | Regional Injuries | C |
| 37 | Regional Injuries | A |
| 38 | Regional Injuries | B |
| 39 | ML Wounds | C |
| 40 | ML Wounds | B |
| 41 | ML Wounds | C |
| 42 | Thermal Deaths | B |
| 43 | Thermal Deaths | C |
| 44 | Thermal Deaths | B |
| 45 | Thermal Deaths | B |
| 46 | Starvation | C |
| 47 | Starvation | B |
| 48 | Mech Asphyxia | C |
| 49 | Mech Asphyxia | B |
| 50 | Mech Asphyxia | B |
| 51 | Mech Asphyxia | B |
| 52 | Mech Asphyxia | A |
| 53 | Anaesthetic Deaths | C |
| 54 | Anaesthetic Deaths | B |
| 55 | Impotence | B |
| 56 | Impotence | B |
| 57 | Virginity/Pregnancy | B |
| 58 | Virginity/Pregnancy | C |
| 59 | Virginity/Pregnancy | B |
| 60 | Abortion | B |
| 61 | Abortion | B |
| 62 | Abortion | B |
| 63 | Sexual Offences | B |
| 64 | Sexual Offences | B |
| 65 | Sexual Offences | B |
| 66 | Infant Deaths | B |
| 67 | Infant Deaths | B |
| 68 | Infant Deaths | C |
| 69 | Blood Stains | B |
| 70 | Blood Stains | C |
| 71 | Blood Stains | B |
| 72 | Artefacts | B |
| 73 | Artefacts | A |
| 74 | FSL | A |
| 75 | FSL | B |
| 76 | Forensic Psychiatry | B |
| 77 | Forensic Psychiatry | B |
| 78 | Toxicology General | B |
| 79 | Toxicology General | B |
| 80 | Agricultural Poisons | B |
| 81 | Agricultural Poisons | A |
| 82 | Agricultural Poisons | A |
| 83 | Corrosive Poisons | A |
| 84 | Corrosive Poisons | B |
| 85 | Metallic Poisons | B |
| 86 | Metallic Poisons | A |
| 87 | Metallic Poisons | A |
| 88 | Inorganic Irritants | B |
| 89 | Organic Irritants | A |
| 90 | CNS Depressants | D |
| 91 | CNS Depressants | B |
| 92 | CNS Depressants | B |
| 93 | Psychotropic Drugs | B |
| 94 | Deliriant Poisons | A |
| 95 | Drug Dependence | B |
| 96 | Drug Dependence | B |
| 97 | Spinal Poisons | B |
| 98 | Cardiac Poisons | A |
| 99 | Asphyxiants | B |
| 100 | Food Poisoning | B |
These 100 MCQs cover all 38 topics in your BBS Forensic Medicine syllabus, drawn from standard textbooks including The Essentials of Forensic Medicine and Toxicology (2026 edition) and Parikh's Textbook of Medical Jurisprudence. Each question tests a high-yield, exam-relevant concept with a clear explanation to reinforce the correct answer.
Create 100 important one liner questions and answers for those topics
Here are 100 important one-liner Q&As covering all BBS Forensic Medicine & Toxicology topics:
100 Important One-Liner Q&A — BBS Forensic Medicine & Toxicology
SECTION I: FORENSIC MEDICINE
1. Introduction
Q1. What is the literal meaning of the word "Forensic"?
A: Belonging to the court/forum (from Latin "forensis").
Q2. Who is called the Father of Forensic Medicine?
A: Fortunato Fidelis (Italy, 1550–1630).
Q3. What is thanatology?
A: The scientific study of death and its signs.
Q4. What is the difference between forensic pathology and forensic medicine?
A: Forensic pathology focuses on postmortem examination; forensic medicine is the broader application of all medical knowledge to legal problems.
2. Legal Procedure
Q5. What is a cognizable offence?
A: An offence in which police can arrest without a warrant and investigate without a magistrate's permission.
Q6. Under which section of CrPC does a magistrate order an autopsy?
A: Section 176 CrPC.
Q7. What is a dying declaration?
A: A statement made by a person regarding the cause or circumstances of their death, admissible under Section 32 of the Indian Evidence Act.
Q8. What is the difference between inquest by police (Sec 174) and by magistrate (Sec 176)?
A: Sec 174 (police inquest) is for routine unnatural deaths; Sec 176 (magistrate inquest) is mandatory for custodial deaths, rape-related deaths, and when police findings are suspicious.
Q9. Who is an expert witness in court?
A: A person with specialized knowledge, skill, or training whose opinion is admissible as evidence (e.g., a forensic pathologist).
Q10. What is a subpoena?
A: A court order compelling a witness (including a doctor) to appear and give testimony.
3. Medical Law and Ethics
Q11. What is the McNaughton rule?
A: A legal test for insanity: at the time of the act, the accused did not know the nature of the act or that it was wrong, due to a disease of the mind.
Q12. What does "res ipsa loquitur" mean in medical negligence?
A: "The thing speaks for itself" — negligence is inferred from the very nature of the event (e.g., surgical instrument left inside a patient).
Q13. What is the Bolam test?
A: A doctor is not negligent if they acted in accordance with a practice accepted by a responsible body of medical opinion in that specialty.
Q14. What are the three elements of medical negligence?
A: Duty of care, breach of that duty, and resulting damage (harm).
Q15. What is informed consent?
A: Consent given by a competent patient after being adequately informed of the nature, risks, benefits, and alternatives of a proposed procedure.
4. Identification
Q16. What are the four types of fingerprint patterns?
A: Loops (most common ~65%), whorls (~30%), arches (~5%), and composites.
Q17. How many Galton's details (points of similarity) are required for fingerprint identification in India?
A: Minimum 12 points.
Q18. What is the Bertillon system of identification?
A: An anthropometric system of body measurements (11 parameters) developed by Alphonse Bertillon; now obsolete.
Q19. What is Gustafson's method?
A: A method of estimating age from teeth using six dental changes: attrition, secondary dentine, cementum apposition, root resorption, periodontosis, and root transparency.
Q20. What does superimposition technique help identify?
A: Identification of skeletal remains by overlaying the skull image with a photograph of the suspected individual.
5. Medicolegal Autopsy
Q21. What is a virtopsy?
A: A virtual autopsy using imaging techniques (CT, MRI) without physical dissection.
Q22. What is the first incision made in a standard medicolegal autopsy?
A: A Y-shaped (or I-shaped) incision from shoulders to sternum to pubis.
Q23. What organs are examined first in a medicolegal autopsy of a poisoning case?
A: Stomach and its contents, followed by liver, kidneys, and brain.
Q24. What is a "negative autopsy"?
A: An autopsy in which no definitive cause of death is found on gross or microscopic examination.
6. Death and Its Cause
Q25. What is somatic (clinical) death?
A: Irreversible cessation of all vital functions — heartbeat, respiration, and brain function.
Q26. What is molecular (cellular) death?
A: Death of individual cells and tissues occurring hours after somatic death.
Q27. What is suspended animation?
A: A state resembling death where vital functions are so depressed they cannot be detected by ordinary means (e.g., hypothermia, electrocution).
Q28. What is the NASH classification of manner of death?
A: Natural, Accidental, Suicidal, Homicidal.
Q29. What is the most common cause of sudden natural death in adults?
A: Ischemic heart disease (coronary artery disease).
7. Postmortem Changes
Q30. What is Nysten's law regarding rigor mortis?
A: Rigor mortis starts in small muscles of the jaw and face, then progresses downward to the neck, trunk, and extremities, and resolves in the same order.
Q31. What is the color of postmortem lividity in CO poisoning?
A: Bright cherry-red (due to carboxyhemoglobin).
Q32. What is the color of postmortem lividity in cyanide poisoning?
A: Bright cherry-red / brick-red (due to histotoxic hypoxia - blood retains oxygen).
Q33. When does rigor mortis appear, peak, and resolve in a temperate climate?
A: Appears: 2–6 hours; complete: 12 hours; starts to pass off: 24–36 hours; completely gone: 36–48 hours.
Q34. What is adipocere?
A: A grave wax formed by saponification of body fat in moist, warm, anaerobic conditions.
Q35. What is mummification?
A: Desiccation (drying) of a body in hot, dry, well-ventilated conditions, leading to preservation.
Q36. What is the "marbling" of putrefaction?
A: Greenish-black arborescent (tree-like) discoloration on skin surface due to gas in superficial blood vessels during putrefaction.
Q37. What is the first external sign of putrefaction?
A: Greenish discoloration over the right iliac fossa (due to action of intestinal bacteria on Hb forming sulfhemoglobin).
8. Mechanical Injuries
Q38. What is the medicolegal importance of an abrasion?
A: It marks the exact site of application of force and can reproduce the shape of the causative weapon (patterned abrasion).
Q39. What is a "patterned bruise"?
A: A bruise that reproduces the shape of the causative object (e.g., belt buckle mark, tyre tread mark).
Q40. What is a laceration?
A: A wound caused by blunt force tearing tissues; characterized by irregular edges, bridging strands, and bruised margins.
Q41. What is the hallmark difference between incised wound and laceration?
A: Incised wound: clean-cut edges, profuse bleeding, no bridging; Laceration: irregular edges, less bleeding, bridging strands present.
Q42. What is a "chop wound"?
A: A wound caused by a heavy, sharp-edged weapon (e.g., axe); it has features of both incised wound and laceration.
9. Regional Injuries
Q43. What is a contrecoup injury?
A: Brain injury at the side opposite to the site of impact, due to movement of the brain within the skull.
Q44. What is a ring fracture of the base of the skull?
A: A circular fracture around the foramen magnum seen in falls from height landing on feet or buttocks.
Q45. What is the "talk and die" syndrome in head injury?
A: A patient who is initially lucid after head trauma but then deteriorates and dies, classically due to extradural hematoma from middle meningeal artery rupture.
Q46. What are defense wounds?
A: Injuries on the ulnar border of the forearm and dorsum of hands sustained while trying to ward off an attack.
10. Medicolegal Aspects of Wounds
Q47. How do you differentiate an antemortem wound from a postmortem wound?
A: Antemortem wounds show vital reaction (bleeding, inflammatory response, bruising); postmortem wounds lack these.
Q48. What are hesitation marks?
A: Multiple superficial, parallel, tentative incisions near the fatal wound, characteristic of suicidal sharp force injuries.
Q49. What is a "gaping wound"?
A: A wound that gapes open due to cut across the direction of Langer's lines; wounds parallel to Langer's lines gape less.
Q50. What is the significance of a "contact wound" in gunshot injuries?
A: The muzzle is placed directly against the skin; it shows a stellate (star-shaped) entrance wound, muzzle contusion ring, and deposition of soot/powder inside the wound track.
11. Thermal Deaths
Q51. What is the pugilistic attitude in burned bodies?
A: A boxer's posture (flexion of arms, fists clenched) due to heat coagulation and shortening of larger flexor muscles; it is a postmortem artifact.
Q52. What is the "crocodile skin" appearance?
A: Rectangular splitting of burned skin by intense heat; a postmortem heat artefact.
Q53. What is the most reliable sign of death from burning (antemortem fire)?
A: Carboxyhemoglobin >10% in blood, and/or soot in airways/alveoli.
Q54. What is heat hyperpyrexia (heat stroke)?
A: Core body temperature >40°C with CNS dysfunction due to failure of thermoregulation.
12. Starvation
Q55. How long can a healthy adult survive without food (but with water)?
A: Approximately 60–70 days.
Q56. What is the classic autopsy finding of the heart in starvation?
A: Brown atrophy of the heart (small, firm heart with brown pigment — lipofuscin — in myocytes).
Q57. What is serous atrophy of fat?
A: Replacement of adipose tissue by gelatinous material (serous/mucinous material) seen in starvation; the fat becomes translucent and jelly-like.
13. Mechanical Asphyxia
Q58. What are Tardieu's spots?
A: Petechial hemorrhages seen on visceral pleura, epicardium, and conjunctiva in asphyxia deaths.
Q59. What is the difference between typical and atypical hanging?
A: Typical: body fully suspended, point of suspension at vertex; Atypical: body partially suspended or point of suspension is not at vertex.
Q60. What is the Simon's sign in drowning?
A: Hemorrhage into the middle ear (tympanic membrane), seen in drowning due to barotrauma.
Q61. What is the "washerwoman's hand" sign?
A: Maceration (wrinkling and pale pallor) of the skin of palms and soles due to prolonged immersion in water.
Q62. What is "café coronary"?
A: Sudden asphyxial death due to impaction of a food bolus (usually meat) in the larynx, mimicking a cardiac event.
Q63. What is traumatic asphyxia?
A: Asphyxia from external compression of the chest (e.g., crush injury in a crowd), preventing respiratory movements; characterized by intense cyanosis and petechiae above the compression line.
14. Anaesthetic and Operative Deaths
Q64. What is Mendelson's syndrome?
A: Chemical pneumonitis following aspiration of acidic gastric contents during anesthesia, causing severe pulmonary injury.
Q65. What drug treats malignant hyperthermia?
A: Dantrolene sodium (ryanodine receptor blocker, reduces Ca²⁺ release from sarcoplasmic reticulum).
Q66. What is the most common cause of death on the operating table?
A: Cardiac arrest (due to anesthetic overdose, hypoxia, or vasovagal reaction).
15. Impotence and Sterility
Q67. What is the legal definition of impotence?
A: Inability to perform the act of sexual intercourse (not inability to procreate); it is grounds for nullity of marriage.
Q68. What is aspermia vs. azoospermia?
A: Aspermia: absence of ejaculate; Azoospermia: absence of spermatozoa in ejaculate.
16. Virginity, Pregnancy, and Delivery
Q69. What is the "Chadwick's sign" of pregnancy?
A: Bluish-violet discoloration of the vagina and cervix due to increased vascularity, appearing at 6–8 weeks.
Q70. What is the Ballottement sign?
A: A clinical sign of pregnancy (16–28 weeks) where the fetus can be felt to rebound when the uterus is gently tapped.
Q71. What is a parous os?
A: The cervical os of a woman who has delivered vaginally; it is transverse/slit-like, compared to the circular os of a nulliparous woman.
17. Abortion
Q72. Under the MTP (Amendment) Act 2021 India, up to what gestational age can abortion be performed for special categories (rape, incest, fetal abnormalities)?
A: Up to 24 weeks (by a board of medical practitioners for some cases, up to any gestation for substantial fetal abnormalities).
Q73. What is the most common cause of death from criminal abortion?
A: Septicemia (peritonitis) and hemorrhage.
Q74. What is a "slippery elm" in criminal abortion?
A: The bark of Ulmus fulva (slippery elm), traditionally used to induce abortion by cervical dilation.
18. Sexual Offences
Q75. What does POCSO stand for?
A: Protection of Children from Sexual Offences Act (2012, amended 2019).
Q76. What is the two-finger test and why is it banned?
A: A discredited per vaginum examination to assess vaginal laxity in rape victims; it violates dignity, lacks scientific validity, and was banned by the Supreme Court of India (2022).
Q77. What is "date rape" drug?
A: Flunitrazepam (Rohypnol) or GHB — sedatives used to incapacitate victims for sexual assault; they cause anterograde amnesia.
19. Infant Deaths
Q78. What is the hydrostatic (Breslau's) test?
A: Lungs that have been aerated (child breathed) float in water (sp. gravity <1.0); non-aerated lungs sink — used to determine if a newborn was born alive.
Q79. What is maceration in a stillborn fetus?
A: Aseptic autolysis of a dead fetus retained in the uterus; skin shows red-brown discoloration and slippage ("glove and stocking" appearance).
Q80. What is the most common method of infanticide?
A: Smothering (suffocation by covering the mouth and nose).
20. Blood Stains
Q81. What does the precipitin test confirm?
A: That blood is of human (or specific animal) origin — it is the confirmatory test for species identification of blood.
Q82. What is the Kastle-Meyer test?
A: A presumptive (screening) test for blood using phenolphthalein and hydrogen peroxide; a pink color is a positive result.
Q83. What percentage of the population are "secretors"?
A: Approximately 80% — they secrete ABO blood group antigens in body fluids (saliva, semen, sweat).
Q84. What is luminol used for?
A: Detection of trace (invisible/washed) bloodstains at crime scenes; it reacts with iron in hemoglobin to produce blue chemiluminescence.
21. Artefacts
Q85. What is a resuscitation artefact?
A: Injuries produced during CPR (rib fractures, sternal fracture, liver lacerations) that can simulate antemortem trauma.
Q86. What is "contact flattening" artefact?
A: Postmortem flattening of skin or soft tissue at pressure points where the body rested, simulating injuries.
Q87. What are "liver mortis" artefacts in drowning?
A: Cherry-red lividity in cold water drowning (due to cold-induced dissociation of oxyhemoglobin) — can be misidentified as CO poisoning.
22. Forensic Science Laboratory
Q88. What is Locard's exchange principle?
A: Every contact between two surfaces leaves a trace — the fundamental principle of trace evidence analysis.
Q89. What technique is the gold standard for drug identification in forensic toxicology?
A: Gas Chromatography-Mass Spectrometry (GC-MS).
Q90. What is ELISA used for in forensic science?
A: Enzyme-Linked Immunosorbent Assay — used as a screening test for drugs of abuse in urine/blood samples.
23. Forensic Psychiatry
Q91. What is testamentary capacity?
A: The legal mental capacity to make a valid will; requires understanding the nature of making a will, the extent of property, and the natural heirs.
Q92. What is the difference between delusion and illusion?
A: Illusion: misperception of a real stimulus; Delusion: a fixed, false, unshakeable belief not based on reality, a feature of psychosis.
SECTION II: TOXICOLOGY
24. General Considerations
Q93. What is the therapeutic index (TI)?
A: TI = LD50 / ED50; it measures the safety margin of a drug — a higher TI means a safer drug.
Q94. What is the antidote for paracetamol poisoning?
A: N-acetylcysteine (NAC) — replenishes hepatic glutathione.
25. Agricultural Poisons
Q95. What is the mechanism of organophosphate toxicity?
A: Irreversible inhibition of acetylcholinesterase, causing accumulation of acetylcholine at cholinergic synapses (muscarinic + nicotinic + CNS effects).
Q96. What is the specific antidote for organophosphate poisoning?
A: Atropine (for muscarinic effects) + Pralidoxime/2-PAM (to reactivate cholinesterase, must be given early before "aging").
Q97. What toxin does Celphos (aluminum phosphide) release?
A: Phosphine gas (PH3) — a highly toxic cellular poison with garlic odor; no specific antidote exists.
26. Corrosive Poisons
Q98. What type of eschar does sulfuric acid (oil of vitriol) produce?
A: A black, hard, charred eschar (due to charring by dehydration/oxidation).
Q99. What type of eschar does nitric acid produce?
A: A yellow eschar (due to xanthoproteic reaction — nitration of proteins).
27. Metallic Poisons
Q100. What is the classic triad of chronic arsenic poisoning (Mees' lines, rain-drop pigmentation, and keratosis)?
A: Chronic arsenicosis triad: rain-drop pigmentation of skin (hyperpigmentation with depigmented spots), palmar/plantar keratosis (hyperkeratosis), and Mees' lines (transverse white lines on fingernails).
28. Inorganic Irritant Poisons
Q101 (Bonus). What is the antidote for cyanide poisoning?
A: Hydroxocobalamin (first-line), or the classic Dicobalt edetate / Sodium nitrite + Sodium thiosulfate combination.
29. Organic Irritant Poisons
Q102 (Bonus). What is the lethal dose of cantharides (cantharidin)?
A: Approximately 10–30 mg of cantharidin can be lethal; it causes severe urinary tract irritation, hematuria, and renal failure.
30. CNS Depressants
Q103 (Bonus). What is the antidote for opioid (morphine/heroin) overdose?
A: Naloxone (Narcan) — a pure opioid receptor antagonist.
31–38. Toxicology (Compiled One-Liners)
Q104 (Bonus). What is the active principle of cannabis (marijuana)?
A: Delta-9-tetrahydrocannabinol (THC).
Q105 (Bonus). What mnemonic describes atropine (belladonna/Datura) poisoning?
A: "Hot as a hare, blind as a bat, dry as a bone, red as a beet, mad as a hatter."
Q106 (Bonus). What is the mechanism of strychnine poisoning?
A: Strychnine blocks inhibitory glycine receptors in the spinal cord, causing violent generalized tetanic convulsions triggered by sensory stimuli.
Q107 (Bonus). What is the characteristic autopsy finding in CO poisoning?
A: Bright cherry-red lividity, blood, and muscles due to carboxyhemoglobin (COHb).
Q108 (Bonus). What bacteria causes botulism food poisoning?
A: Clostridium botulinum (produces a preformed neurotoxin that blocks acetylcholine release at neuromuscular junction, causing flaccid paralysis).
Note: Q101–Q108 are bonus one-liners (8 extra) completing the final toxicology topics. The core 100 run from Q1–Q100, with the bonuses covering remaining toxicology sub-topics. All answers are based on standard BBS forensic medicine textbooks including The Essentials of Forensic Medicine & Toxicology (2026) and Parikh's Textbook of Medical Jurisprudence.
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