Category: Quiz

Answer: B. Nonporous surfaces

Explanation: The Vacuum Metal Deposition (VMD) method is primarily used for developing latent fingerprints on nonporous surfaces such as glass, metal, or plastics. In this technique, a thin layer of metal (e.g., gold, zinc, or silver) is vaporized and deposited onto the surface, adhering to the residue left by the fingerprint ridges. This method is not suitable for porous surfaces like paper or wood, as the metal vapor would penetrate the porous material, resulting in poor ridge detail.

Answer: B. 1 and 4 are correct.

Explanation: In the primary classification of fingerprints, the formula ‘1/1’ indicates that both the right ring and little fingers have loop patterns. Whorls are represented by a different numerical value in the classification formula. Option 4 is correct because the provided options do not cover all possibilities, and there could be cases where neither finger has a loop or whorl pattern.

Answer: C. Both (A) and (R) are correct.

Explanation: When recording fingerprints, both rolled impressions (where the finger is rolled from one side to the other) and plain impressions (where the finger is pressed flat onto the surface) are obtained. The reason for taking both types of impressions is to ensure accuracy and detect any potential errors during the recording process. If there is a discrepancy between the rolled and plain impressions, it can indicate a mistake in the rolled impression, which is more prone to distortion. Therefore, taking both types of prints allows for cross-verification and improves the reliability of the fingerprint recording.

Answer: A) Transitional and permanent

Explanation: In the examination of typescripts, two main types of individual characteristics are considered: transitional and permanent. Transitional characteristics are those that change over time due to wear and tear on the typewriter, while permanent characteristics remain consistent throughout the typewriter’s lifespan. These characteristics can include variations in typeface, alignment, spacing, and ribbon usage.

Answer: B. A rolling ball and liquid ink

Explanation: A roller pen, also known as a ball pen or ballpoint pen, uses a small rotating ball at the tip to dispense liquid ink onto the writing surface. The ball is held in place by a socket, and the liquid ink is fed from an ink reservoir. The ink used in roller pens is typically a viscous liquid ink, designed to adhere to the ball and flow smoothly onto the paper or other writing surfaces.

Answer: C. Both (A) and (R) are correct.

Explanation: Ninhydrin is a chemical reagent commonly used to develop latent fingerprints on porous surfaces like paper or cardboard. When ninhydrin reacts with the amino acids present in the fingerprint residue, a purple-colored compound called Ruhemann’s purple is formed, making the fingerprint ridges visible. The assertion that ninhydrin is applied to visualize latent fingerprints as purple-colored visible prints is correct, and the reason that ninhydrin reacts with the amino acids in the fingerprint residue is also correct.

Answer: C. Dandy rolls

Explanation: Watermarks in paper are made with the help of dandy rolls, which are embossed rolls used in the papermaking process. As the paper pulp passes between the dandy rolls, the raised design on the rolls creates a pattern or watermark in the paper. This watermark can be used for security purposes, branding, or identification.

Answer: B. Both (A) and (R) are correct.

Explanation: Digital image technology is indeed a powerful tool for recording crime scenes, as it allows for detailed documentation and preservation of evidence. The reason (R) is also correct because digital imaging enables real-time access and sharing of crime scene images, even for those who are not physically present at the location. This can facilitate remote collaboration and analysis by experts or investigators.

Answer: D. Multilevel Management

Explanation: Crime scene management involves several interrelated components, including information management (documentation and data handling), manpower management (assigning and coordinating personnel), and logistics management (managing resources and equipment). However, “multilevel management” is not a recognized component of crime scene management.

Answer: A. Modus operandi

Explanation: The term “modus operandi” refers to a criminal’s characteristic and repetitive pattern of behavior or method of operation. It describes the unique way in which a criminal carries out their criminal activities, including their preferred techniques, habits, and behaviors. Analyzing the modus operandi can help investigators link multiple crimes to the same perpetrator and develop profiles or leads.

Answer: B. Recognise, preserve, collect, interpret and reconstruct

Explanation: The objective of any crime scene investigation follows a specific sequence of steps. First, the crime scene must be recognized and secured to preserve the evidence. Next, the evidence is carefully collected, ensuring proper documentation and handling. The collected evidence is then interpreted and analyzed to reconstruct the events and establish the facts of the case.

Answer: D. (a) (iii), (b) (iv), (c) (ii), (d) (i)

Explanation: The matching is as follows:
(a) Vancetich – (iii) Fingerprints (Vancetich method of fingerprint development)
(b) ER Henry – (iv) Classification of Fingerprints (Henry system of fingerprint classification)
(c) Hilton – (ii) Documents Examination (Hilton’s work in document examination)
(d) Oden & Hoffsten – (i) Ninhydrin test (Oden and Hoffsten’s work on the ninhydrin test for fingerprints)

Answer: B. Level 1, level 2, level 3 details

Explanation: In fingerprint analysis, there are three levels of details that are used for comparison and identification:
Level 1: Pattern type (arch, loop, whorl)
Level 2: Ridge path, ridge endings, bifurcations
Level 3: Ridge unit details (pores, ridge edges, dots, and other minute details)
The correct order for comparing these details is Level 1 (pattern type) first, followed by Level 2 (ridge paths and minutiae), and finally Level 3 (ridge unit details) for a more detailed comparison.

Answer: A. Tandem bullet

Explanation: A tandem bullet, also known as a multi-component bullet, consists of two or more separate projectiles stacked one behind the other. When fired, these projectiles separate after entering the target, creating multiple wound tracks and exit wounds. This can result in a single wound of entry but multiple wounds of exit, as the projectiles follow different paths after entering the body.

Answer: D. All of the above

Explanation: An Improvised Explosive Device (IED) refers to a homemade bomb or explosive device constructed from readily available materials. Examples of IEDs include:
– Acid bomb: A bomb made by mixing certain acids with other materials to create an explosive reaction.
– Letter bomb: A bomb concealed within a letter or package for delivery.
– Molotov cocktail: A improvised incendiary device made from a bottle filled with a flammable liquid, often gasoline, and a rag as a wick.

Answer: C. Maiti

Explanation: The Maiti test, also known as the sodium rhodizonate test, is a chemical test used to detect the presence of nitrites in gunshot residue samples. Nitrites are formed as a byproduct of the combustion of gunpowder, and their detection can help establish the presence of gunshot residue. The Maiti test involves treating the sample with a sodium rhodizonate solution, which turns pink or red in the presence of nitrites.

Answer: C. Rifling

Explanation: The terms “broaching” and “swaging” are associated with the rifling process in firearms. Rifling refers to the spiral grooves cut into the barrel of a gun, which imparts a spin on the bullet or projectile as it travels down the barrel. Broaching is the process of cutting these rifling grooves into the barrel, while swaging is the process of forming the bullet or projectile to match the rifling grooves, ensuring a tight fit and proper spin.

Answer: D. Gutter fracture

Explanation: When a bullet glances or strikes the skull at an angle, it can produce a gutter fracture, which is a type of fracture characterized by a groove or furrow in the bone. A gutter fracture is caused by the bullet’s tangential impact and the temporary cavity it creates, resulting in a trench-like injury on the outer surface of the skull. This type of fracture is typically associated with grazing or glancing gunshot wounds to the head.

Answer: D. Both (A) and (R) are correct.

Explanation: The assertion (A) that tremors in writing strokes may indicate possible forgery of signatures is correct. Tremors or irregularities in the writing can be a sign of an attempted forgery, as the forger may struggle to replicate the natural flow and rhythm of the genuine signature. The reason (R) is also correct because tremors due to age or illness tend to be more consistent and repeated at regular intervals, while tremors in a forged signature are often irregular and inconsistent, as the forger attempts to mimic the genuine signature.

Answer: B. Teeth

Explanation: The Boydes method, also known as the Boydes technique, is a method used in forensic odontology to estimate age from teeth. It involves analyzing the formation and calcification patterns of teeth, specifically the eruption of permanent teeth and the level of root development. By comparing these dental features to established age standards, the Boydes method can provide an estimate of an individual’s age, especially in cases where other age estimation methods may be limited or unavailable.

Answer: C. Calcaneum

Explanation: The calcaneum, also known as the heel bone, is the first bone in the human body to develop an ossification center (a point of bone formation). The ossification center in the calcaneum appears before birth, typically around the sixth month of fetal development. This early ossification of the calcaneum is crucial for weight-bearing and movement after birth.

Answer: A. Oligospermia

Explanation: Oligospermia is a condition characterized by an abnormally low sperm count in the semen. It is a form of male infertility or subfertility, where the concentration of sperm cells in the ejaculate is lower than the normal range. Oligospermia can result from various factors, including genetic disorders, hormonal imbalances, environmental exposures, or underlying medical conditions.

Answer: A. Both (A) and (R) are correct.

Explanation: Haemoptysis is the coughing up or spitting of blood from the lungs or respiratory tract. The blood expelled during haemoptysis is typically bright red in color because it is oxygenated blood from the pulmonary circulation. The assertion (A) that haemoptysis blood is bright red in color is correct, and the reason (R) that it is because the blood is oxygenated is also correct.

Answer: C. Neutrophil

Explanation: The Davidson’s body, also known as the neutrophil extracellular trap (NET), is a structure found within neutrophils, which are a type of white blood cell. Neutrophils are a key component of the immune system and play a crucial role in combating infections. The Davidson’s body is a web-like structure composed of DNA and proteins released by neutrophils to trap and immobilize pathogens such as bacteria and fungi.

Answer: D. 47 XXY

Explanation: Klinefelter syndrome is a genetic condition that affects males, caused by an additional X chromosome. The karyotype (chromosomal makeup) in Klinefelter syndrome is 47,XXY, where there is an extra X chromosome in addition to the typical 46,XY karyotype found in most males. This extra X chromosome leads to the characteristic physical and developmental features associated with Klinefelter syndrome.

Answer: B. Sex

Explanation: The Washburn’s index, also known as the cranial index or skull index, is a measurement used in forensic anthropology to determine the sex of an individual from skeletal remains. It is calculated by dividing the maximum breadth of the skull by its maximum length and multiplying by 100. This index helps distinguish between male and female skulls based on the shape and proportions of the cranium, which tend to differ between the sexes.

Answer: B. 1 and 4 are correct.

Explanation: In the primary classification of fingerprints, the first step is to divide all the patterns into loops and whorls (statement 1 is correct). The addition of “1” to both the numerator and denominator of the classification formula is an arbitrary convention (statement 4 is correct). However, whorls do not include arches (statement 2 is incorrect), and loops are not the only patterns with numerical values (statement 3 is incorrect).

Answer: D. 24 hours

Explanation: Sudden death is typically defined as a death that occurs unexpectedly and rapidly, usually within 24 hours of the onset of symptoms or without any apparent preceding illness or injury. If a person dies within 24 hours of the initial onset of symptoms or the precipitating event, without suffering from a known disease or injury, it is considered a sudden death.

Answer: B. Time since death

Explanation: Forensic entomology, the study of insects and their interactions with decomposing remains, is primarily used to estimate the time since death or the postmortem interval (PMI). By analyzing the types of insects present, their life stages, and their patterns of colonization on the body, entomologists can provide an estimate of the time elapsed since death occurred.

Answer: C. Mycobacterium

Explanation: Putrefaction is the process of decomposition of organic matter by bacteria and fungi, resulting in the breakdown of tissues and the release of foul odors. Bacteria such as Proteus, Staphylococcus, and Clostridium are commonly associated with putrefaction and play a role in the decomposition of bodies. However, Mycobacterium species are not typically associated with the putrefaction process.

Answer: D. Traumatic asphyxia

Explanation: Traumatic asphyxia is a form of mechanical asphyxia that occurs due to severe external compression of the chest and abdomen, leading to impaired breathing and respiratory failure. In cases of traumatic asphyxia, there is often damage to the neck structures, such as bruising or fractures of the larynx or trachea, caused by the external compression forces.

Answer: B. Alcohol dehydrogenase

Explanation: The enzyme responsible for metabolizing alcohol in the liver is called alcohol dehydrogenase (ADH). ADH catalyzes the oxidation of ethanol (the type of alcohol present in alcoholic beverages) to acetaldehyde, which is then further broken down by other enzymes. The activity of alcohol dehydrogenase in the liver plays a crucial role in the body’s ability to process and eliminate alcohol.

Answer: A. Cadaveric spasm

Explanation: Cadaveric spasm, also known as rigor mortis, is the temporary stiffening of the muscles after death. While it can help establish the time since death, it does not provide a precise estimation. Marbling (discoloration of blood vessels), foamy liver (caused by putrefaction), and hypostasis (gravitational pooling of blood) are all changes that can help estimate the time since death more accurately by examining their progression.

Answer: D. All of the above

Explanation: Glass fragments can be compared and potentially linked to the same source using various techniques:
Physical matching: Examining the physical characteristics and attempting to fit the fragments together.
Refractive index: Measuring the refractive index of the glass, which can vary depending on the composition and manufacturing process.
Density gradient tube: Analyzing the density of the glass fragments using a density gradient tube, which separates materials based on their density.

Answer: A. Poison that stimulate respiratory centre – Amphetamines

Explanation: Amphetamines are central nervous system stimulants that can increase respiratory rate and stimulate the respiratory center in the brain. Cocaine is a central nervous system stimulant that can cause respiratory depression and failure of the respiratory center. Strychnine is a poison that affects the spinal cord and causes muscle spasms, including those of the respiratory muscles, leading to respiratory failure. Atropine is a substance that can cause hallucinations and delirium, but it is not primarily classified as a hallucinogen.

Answer: D. All of the above

Explanation: Microscopic examination of paint chips from a car can provide valuable information for forensic analysis. It may involve:
Sequence of paint layers: Determining the order and number of paint layers applied to the vehicle.
Colour of the paint: Analyzing the colour and pigments used in each layer.
Elemental profile of paint: Identifying the chemical elements and their concentrations in the paint using techniques like energy-dispersive X-ray spectroscopy (EDS).

Answer: C. Tool marks

Explanation: A striagraph is an instrument used in forensic science to examine and analyze tool marks. It is a specialized microscope that allows for the detailed study of the striations, or fine parallel lines, left on surfaces by tools or other objects. By examining the unique patterns and characteristics of these tool marks, forensic investigators can potentially link them to specific tools or weapons used in a crime.

Answer: A. Firing pin

Explanation: Compression tool marks are formed by the firing pin of a firearm when it strikes the primer of a cartridge case during firing. The impact of the firing pin creates a characteristic impression or mark on the primer, which can be analyzed and compared to potential suspect firearms. Other tools like wrenches, knives, or needles are not typically associated with the formation of compression tool marks in the context of firearms examination.

Answer: D. Choline esterase

Explanation: Human semen contains various components, including:
Deoxyribonucleoprotein (DNA)
Hyaluronidase (an enzyme)
Lipoglycoprotein (a complex of lipids, carbohydrates, and proteins)
However, choline esterase is an enzyme that is typically not found in human semen.

Answer: C. Cut hair

Explanation: For nuclear DNA profiling, samples that contain the root of the hair are preferred, as the root contains living cells with nuclear DNA. Fallen and plucked hairs typically include the root and can be used for DNA profiling. However, cut hair, which consists only of the shaft and lacks the root, does not contain nuclear DNA and is not suitable for nuclear DNA profiling.

Answer: B. Both (A) and (R) are incorrect.

Explanation: The assertion (A) is incorrect because the number of cells lost from the gastrointestinal tract per day can be sufficient for mitochondrial DNA testing from fecal matter. The reason (R) is also incorrect because the inhibitory effect of bile pigments on DNA testing is not related to their concentration but rather to their ability to degrade DNA and inhibit the amplification process during DNA analysis.

Answer: C. Metopic

Explanation: The metopic suture, also known as the frontal suture, is the first cranial suture to fuse as a person ages. It is located between the two halves of the frontal bone and typically fuses between the ages of 2 and 8 years. The other sutures, such as the sagittal, coronal, and lambdoidal sutures, fuse at later stages of life.

Answer: A. Melanin

Explanation: Keratins are a type of structural protein found in hair, nails, and skin. These sulfur-containing proteins are interlinked to form stable fibrillar structures. The pigment that gives hair its color is melanin, which is produced by melanocyte cells and incorporated into the keratin fibrils during hair growth.

Answer: B. Petrographic Microscope

Explanation: A polarizing microscope, also known as a petrographic microscope, is a type of microscope that utilizes polarized light to analyze the optical properties of materials, particularly minerals and crystalline substances. It is widely used in mineralogy, geology, and material science for the identification and characterization of various materials based on their optical properties, such as birefringence, pleochroism, and extinction angles.

Answer: B. Partition between the gas and an immobile liquid phase

Explanation: Gas-liquid chromatography (GLC) is an analytical technique based on the principle of partitioning between a mobile gaseous phase and an immobile liquid phase. In GLC, the sample mixture is vaporized and carried by an inert gas (mobile phase) through a column containing a liquid stationary phase coated on an inert solid support. The components of the sample mixture partition between the gas and liquid phases based on their relative affinities, resulting in their separation and detection.

Answer: C. Photovoltaic cell

Explanation: In visible spectrophotometry, which measures the absorption or transmission of light in the visible region of the electromagnetic spectrum, a photovoltaic cell is commonly used as a detector. A photovoltaic cell is a device that converts light energy into electrical energy, making it suitable for detecting and measuring the intensity of light transmitted or absorbed by a sample in a spectrophotometer.

Answer: D. GC-MS

Explanation:
AAS (Atomic Absorption Spectroscopy) is used for the analysis of metals by measuring the absorption of light by gaseous atoms.
ICP-MS (Inductively Coupled Plasma Mass Spectrometry) is an analytical technique that can detect and quantify metals and other elements in a sample.
NAA (Neutron Activation Analysis) is a nuclear technique used for the qualitative and quantitative analysis of metals and other elements by measuring the characteristic radiation emitted by the sample after being bombarded with neutrons.
GC-MS (Gas Chromatography-Mass Spectrometry) is primarily used for the analysis of organic compounds and is not well-suited for the analysis of metals.

Answer: D. All of the above

Explanation: The Rf (retardation factor) value in chromatography depends on various factors:
Solvent system employed: The polarity and composition of the solvent system used in the chromatographic separation can affect the Rf value of a compound.
Temperature: Changes in temperature can influence the interactions between the compound and the stationary phase, affecting the Rf value.
Chamber saturation: The level of saturation of the chromatography chamber with solvent vapors can impact the movement of the solvent front and, consequently, the Rf value.

Answer: B. (a) (ii), (b) (i), (c) (iv), (d) (iii)

Explanation:
(a) Gettler’s Test – (ii) Drowning (Gettler’s test is used to determine if drowning occurred)
(b) Teichman’s Test – (i) Blood stains (Teichman’s test is used to detect the presence of blood)
(c) Hydrostatic Test – (iv) Live birth (The hydrostatic test is used to determine if a newborn was stillborn or born alive)
(d) Lugol’s iodine – (iii) Vaginal cells (Lugol’s iodine is used to stain and identify vaginal cells)

Answer: C. Red blood cells

Explanation: Red blood cells (RBCs) are not typically used for DNA analysis because they lack a nucleus and thus do not contain nuclear DNA. The other options, spermatozoa, vaginal cells, and buccal mucosal cells, all contain nuclei and are suitable sources for DNA analysis and profiling in forensic investigations.

Answer: C) Shimla

Explanation: The first government examiner of questioned document laboratory in India was established in Shimla. This laboratory was established to examine and analyze questioned documents, handwritings, and other related forensic evidence.

Answer: C) (iv) (iii) (ii) (i)

Explanation: The correct matching is as follows: (a) Principle of exchange – (iv) Locard (b) Dactyloscopy – (iii) Fauld (c) Forensic anthropometry – (ii) Bertillon (d) Forensic ballastics – (i) Burrad

Answer: B) 1972

Explanation: The Lok Nayak Jai Prakash National Institute of Criminology and Forensic Science, located in New Delhi, was established in the year 1972. It is a premier institute dedicated to the study and research of criminology and forensic science.

Answer: B) Forensic serology

Explanation: Blood group typing is a part of forensic serology, which is the study and analysis of body fluids, such as blood, semen, and saliva, in forensic investigations. Blood group typing is used to identify the blood group of an individual from biological evidence found at a crime scene or on a suspect.

Answer: B) (i), (ii) and (iv) are correct.

Explanation: According to the answer key provided, the correct options for preserving surface footprints are photography, casting, and the electrostatic method. Tracing is not listed as one of the correct options.

Answer: D) (d) (c) (b) (a)

Explanation: Based on the answer key provided, the correct matching of instruments with their respective sources of radiation is: (i) AAS – (d) Hallow cathode lamp (ii) UV radiation – (c) Hydrogen lamp (iii) Visible radiation – (b) Tungsten filament lamp (iv) NAA – (a) RA²²⁶ (Radium-226)

Answer: B) Tesla

Explanation: In Nuclear Magnetic Resonance (NMR) spectroscopy, the magnetic field strength is measured in units of Tesla. The Tesla is the derived unit of magnetic flux density in the International System of Units (SI). NMR spectroscopy relies on the interaction of atomic nuclei with a strong external magnetic field, and the field strength is typically measured in Tesla or its fractions.

Answer: C) (A) is true, but (R) is false.

Explanation: The assertion (A) that drugs can be analyzed by High-Performance Liquid Chromatography (HPLC) is true. HPLC is a widely used analytical technique for separating and quantifying drug compounds and their metabolites. However, the reason (R) that the drug gets precipitated with the column is false. In HPLC, the separation of compounds occurs based on their differential partitioning between the mobile and stationary phases, not precipitation.

Answer: B) Abbe’s condenser

Explanation: The Abbe’s condenser is the part of a microscope responsible for focusing the light onto the specimen or object being observed. It is a lens system located below the stage that collects and concentrates light from the illumination source onto the object. This focused light allows for better illumination and resolution when observing specimens under the microscope.

Answer: B) Red cell antigen

Explanation: The ABO blood grouping system is based on the presence or absence of specific antigens on the surface of red blood cells (RBCs). These antigens are referred to as A and B antigens. Individuals with A antigen on their RBCs belong to blood group A, those with B antigen belong to blood group B, those with both A and B antigens belong to blood group AB, and those without either antigen belong to blood group O. The ABO blood grouping is not based on red cell enzymes, plasma proteins, or HLA (Human Leukocyte Antigen) typing.

Answer: B) Both (A) and (R) are true.

Explanation: The assertion (A) that DNA isolated from skeletal remains gives the same pattern as that of blood is correct. DNA is present in all nucleated cells of the body, including bone cells and blood cells. Therefore, the DNA profile obtained from skeletal remains should match the DNA profile obtained from blood samples of the same individual. The reason (R) that DNA is somatically stable is also true. Somatic cells (non-reproductive cells) have stable DNA, which means that the DNA sequence remains unchanged throughout the life of an individual, except for rare mutations.

Answer: D) Haptoglobin

Explanation: Haptoglobin is not a red cell enzyme. It is a plasma protein that binds to free hemoglobin in the bloodstream. Adenylate kinase, phospho glucomutase, and peroxidase are enzymes found within red blood cells (RBCs) and are involved in various metabolic processes.

Answer: A) Single system of electrophoresis

Explanation: The enzymes PGM (Phosphoglucomutase), ESD (Esterase D), and GLO-I (Glyoxalase I) can be analyzed on a single plate using a single system of electrophoresis. This technique separates and visualizes these enzymes simultaneously on the same gel or plate based on their differential migration rates under an applied electric field.

Answer: A) Pyrethrins

Explanation: Pyrethrins are insecticides of vegetable origin, derived from certain species of chrysanthemum flowers. They are natural compounds with insecticidal properties. DDT (Dichlorodiphenyltrichloroethane), Eldrin (an organochlorine insecticide), and Malathion (an organophosphate insecticide) are synthetic insecticides, not of vegetable origin.

Answer: A) Both (A) and (R) are true.

Explanation: The assertion (A) that methyl alcohol (methanol) is a central nervous system (CNS) depressant and its toxicity is mainly due to formic acid is true. Methanol is metabolized in the liver to formaldehyde and then to formic acid, which is highly toxic and can cause metabolic acidosis, blindness, and even death. The reason (R) that methanol is metabolized by the liver is also true. The liver is the primary site for the metabolism of methanol in the body.

Answer: B) Dead body was shifted

Explanation: If a dead body is found lying on its back but shows lividity (discoloration due to the pooling of blood) on the front or anterior part of the body, it indicates that the body was shifted after death. Lividity occurs due to the gravitational settling of blood in the dependent parts of the body after death. If the lividity pattern does not match the position of the body, it suggests that the body was moved or shifted from its original position.

Answer: B) (ii) and (iii) are correct.

Explanation: Papaverum somniferum, also known as the opium poppy, is a plant species that contains various active constituents, including alkaloids. The correct active constituents listed are codeine and papaverine. Codeine is a narcotic analgesic and a naturally occurring alkaloid found in the opium poppy. Papaverine is a non-narcotic alkaloid that has smooth muscle relaxant properties and is used for certain medical conditions. Calatropin and hyoscyamine are not active constituents of the opium poppy plant.

Answer: D) Non-volatile organic compound

Explanation: The ammonium sulfate method is a technique used for the extraction of non-volatile organic compounds, such as drugs and other substances, from biological materials like viscera (internal organs). This method is particularly useful in forensic toxicology for the isolation and analysis of non-volatile organic compounds from visceral samples. Barbiturates, arsenic trioxide, and insecticides are not typically extracted using the ammonium sulfate method, as they may require different extraction techniques based on their chemical properties.

Answer: B) Delusion

Explanation: The term ‘cocaine bugs’ refers to a specific type of delusion experienced by individuals who chronically consume cocaine. This delusion involves the belief that insects or other small creatures are crawling on or under the skin, causing an intense urge to scratch or pick at the skin. This delusion is a manifestation of the psychological and neurological effects of chronic cocaine use, and it is not considered a hallucination or illusion, which involve distortions of sensory perception.

Answer: A) (A) is true, but (R) is false.

Explanation: The assertion (A) that chemically erased ink writings can be restored is true. There are various forensic techniques, such as chemical and optical methods, that can potentially restore or reveal erased ink writings, depending on the type of ink and erasure method used. However, the reason (R) that the reaction of chemical erasure and ink is reversible is false. The process of chemical erasure typically involves an irreversible chemical reaction that alters or removes the ink from the substrate, making the original writing difficult or impossible to restore completely.

Answer: B) Unburnt particles, smoke, flame, projectiles

Explanation: When a firearm is discharged, the components of the gunshot discharge travel in the following ascending order: Unburnt particles: These are the unburnt gunpowder particles or residues that are ejected first from the muzzle of the firearm. Smoke: The combustion of gunpowder produces smoke, which follows the unburnt particles. Flame: The burning of the gunpowder generates a brief flash or flame, which travels after the smoke. Projectiles: The bullet or projectile is the last component to leave the muzzle, propelled by the expanding gases from the burning gunpowder. This order is important in forensic investigations involving gunshot residue analysis and reconstructing the events surrounding a shooting incident.

Answer: C) Frangible

Explanation: In police training firing ranges, frangible bullets are commonly used for safety reasons. Frangible bullets are designed to break apart or disintegrate upon impact with a hard surface, reducing the risk of ricochets and minimizing potential injuries. These bullets are typically made of a specialized material, such as compressed powders or polymer composites, that fragments on impact. Dum-dum bullets are prohibited under international law due to their expansive and deforming nature, which can cause unnecessary suffering. Explosive bullets are also generally not used in training scenarios. Tracer bullets are primarily used for military purposes to aid in trajectory visualization and not typically employed in police training ranges.

Answer: C) (A) is true, but (R) is false.

Explanation: The assertion (A) that rifling in a self-loading rifle (SLR) helps to shoot a target with greater accuracy is true. Rifling refers to the spiral grooves cut into the barrel of a firearm, which imparts a spinning motion to the projectile as it travels down the barrel. This spin stabilizes the projectile’s flight, improving accuracy and reducing the effects of crosswinds or other environmental factors.

The reason (R) that rifling helps in the reduction of pellet dispersion is false. Pellet dispersion refers to the spread or dispersal of multiple pellets or shot from a shotgun. However, in the case of a rifle like an SLR, rifling helps to reduce the dispersion of a single projectile (bullet) by stabilizing its trajectory, thereby improving accuracy.

Answer: B) 4 2 1 3

Explanation: The correct matching is as follows:
I. Griess Test – 4. Presence of nitrite (The Griess test is used to detect the presence of nitrites, which can indicate the presence of gunshot residue)
II. Empty Cartridge case at scene of occurrence – 2. Pistol (Empty cartridge cases are typically associated with pistols or handguns)
III. Powder pattern – 1. Infra red photography (Infrared photography can be used to visualize and document gunshot residue patterns)
IV. Wads at scene of occurrence – 3. Shot gun (Wads are used in shotgun shells and may be found at the scene of a shotgun discharge)

Answer: B) Puppi’s

Explanation: The Puppi’s rule is a forensic technique used to determine the sequence of gunshot wounds on a skull or cranium. It is based on the principle that the fracture patterns and characteristics of the bone around each gunshot wound can provide clues about the order in which the shots were fired.

The Puppi’s rule considers factors such as the direction of the radiating fractures, the degree of beveling (the sloping or angling of the bone around the wound), and the presence of secondary fractures caused by subsequent shots. By analyzing these features, forensic experts can reconstruct the sequence of shots that impacted the skull, which is crucial in understanding the circumstances surrounding a shooting incident.

Answer: A) I and II are correct.

Explanation: The singing effect, also known as the whistling or sizzling effect, is a characteristic observed in certain types of fibers when they are burned or exposed to high temperatures. This effect is most commonly associated with animal fibers like hair and wool. When hair or wool fibers are burned, they tend to produce a hissing or whistling sound, known as the singing effect. This phenomenon is caused by the rapid escape of gases through the microporous structure of these fibers as they burn. The singing effect is not typically observed in synthetic fibers like nylon or natural plant fibers like cotton.

Answer: D) I, II and III are correct.

Explanation: DNA can be isolated from the root, cortex, and cuticle of a hair strand. The root, which is the living part of the hair, contains nucleated cells and is the primary source of DNA. The cortex and cuticle, which are the non-living parts of the hair, may also contain traces of nuclear DNA from the root cells. The medulla, which is the central core or channel running along the hair shaft, does not contain nucleated cells and is therefore not a source of DNA. It is composed of keratin and other proteins but lacks genetic material.

Answer: D) Mitochondrial DNA can be extracted from human hair shaft if root is absent.

Explanation: The statement that mitochondrial DNA can be extracted from the human hair shaft if the root is absent is false. Mitochondrial DNA (mtDNA) is present in the mitochondria, which are organelles found in the living cells of the hair root. The hair shaft itself does not contain mitochondria or mitochondrial DNA. Therefore, if the root is absent, it is not possible to extract mtDNA from the remaining hair shaft.

Answer: A) III IV II I

Explanation: The correct matching is as follows:

(a) Urobilinagen Test – III. Faecal matter (Urobilinogen is excreted in feces and can be detected in faecal matter)

(b) Gunzberg’s Test – IV. Vomit (Gunzberg’s test can detect the presence of bile in vomit)

(c) Creatinine Test – II. Urine (Creatinine is a waste product excreted in urine and is commonly used to assess kidney function)

(d) Starch-Iodine Test – I. Saliva (The starch-iodine test is often used to detect the presence of amylase in saliva)

Answer: C) Black eye (Racoon eye)

Explanation: A black eye, also known as a raccoon eye, is a bruise or discoloration around the eye area caused by trauma or injury. While it may be painful and visually apparent, it is generally considered a minor injury and does not amount to grievous hurt according to legal definitions. Permanent loss of hearing, fracture of a bone, and permanent disfiguration of the face are all considered grievous hurt as they involve permanent privation of functions, disfigurement, or serious bodily injury.

Answer: D) Pyrex is one of the most common trade names of soda lime glass.

Explanation: The statement that Pyrex is one of the most common trade names of soda-lime glass is not true. Pyrex is a brand name for a type of borosilicate glass, which is different from soda-lime glass. Soda-lime glass is a common type of glass used for windows, bottles, and other applications, made by melting a mixture of sodium oxide (soda), calcium oxide (lime), and silica sand. Pyrex, on the other hand, is a low-thermal-expansion borosilicate glass known for its excellent heat resistance and durability.

Answer: C) to determine the side from which force has been applied.

Explanation: The RRR formula, or the Radial, Reverse and Reverse pattern, is a technique used in the examination of fractured glass to determine the side from which the force was applied. It involves analyzing the fracture patterns and characteristics, such as the direction of radial cracks, the presence of reverse cracks, and the overall fracture behavior. By studying the RRR pattern, forensic experts can determine whether the force was applied from the inside or outside of the glass, which can provide valuable information in cases involving glass breakage, such as burglaries or vehicle accidents.

Answer: A) Day light

Explanation: To accurately compare and distinguish soil samples from different sources based on their color, the comparison should be carried out under daylight conditions. Daylight provides the most natural and consistent illumination, allowing for the accurate perception and differentiation of colors in soil samples. Incandescent and fluorescent lights can alter the perceived color due to their specific wavelength emissions, making it more challenging to accurately compare soil colors from different sources.

Answer: A) All are correct.

Explanation: All of the listed parameters influence the nature and characteristics of tool marks left on surfaces or objects. The horizontal angle, vertical angle, pressure applied, and the specific side of the tool blade used can all affect the shape, depth, and overall appearance of the tool mark. These factors are crucial in interpreting and analyzing tool marks in forensic investigations, as they can help identify the type of tool used and potentially link it to a suspect or crime scene.

Answer: C) (i) and (iii) are correct.

Explanation: The different dye constituents present in ink can be separated and analyzed using the following techniques: (i) TLC (Thin Layer Chromatography): TLC is a technique that separates and identifies the different components of a mixture, such as ink dyes, based on their differential migration rates on a stationary phase. (iii) Electrophoresis: This technique separates charged molecules, such as dyes, based on their differential migration rates in an electric field. It is commonly used to separate and analyze the dye components of inks. VSC (Video Spectral Comparator) and ESDA (Electrostatic Detection Apparatus) are techniques used for document examination and visualization, but they are not typically used for separating dye constituents from ink.

Answer: B) Persecution

Explanation: Daniel M’Naghten, a Scottish woodturner, was suffering from a delusion of persecution when he attempted to assassinate the British Prime Minister in 1843. He believed that he was being persecuted by the Tory government and that the Prime Minister was personally involved in a conspiracy against him. This incident led to the establishment of the famous “M’Naghten rules” for determining legal insanity in criminal cases involving individuals with mental disorders.

Answer: D) All of the above

Explanation: Gait analysis, or the examination of walking patterns, involves studying various features and characteristics of an individual’s gait. These features include: Direction line: The overall direction of travel. Foot angle: The angle at which the foot strikes the ground. Foot length: The length of the foot impressions. Step length: The distance between successive footprints of the same foot. Walking line: The line connecting the centers of successive footprints. Step breadth: The lateral distance between successive footprints. All of these features are analyzed to identify unique characteristics and potentially link gait patterns to individuals in forensic investigations.

Answer: C) Metaphysis

Explanation: The fusion of the diaphysis (the shaft of a long bone) and the epiphysis (the rounded end of a long bone) is called the metaphysis. It is the region where the diaphysis and epiphysis meet and eventually fuse as an individual reaches skeletal maturity. The metaphysis plays a crucial role in the growth and development of long bones during childhood and adolescence.

Answer: A) Subpubic angle

Explanation: The subpubic angle, also known as the subpubic concavity or ventral arc, is considered the best feature of the pelvis bone for accurate sex determination. This angle is formed by the inferior rami of the pubic bones and is generally wider and more obtuse in females (around 90 degrees or more) compared to males (around 50-60 degrees). This difference is primarily due to the adaptations for childbirth in females. The subpubic angle provides a reliable indicator of sex, particularly in adult skeletal remains.

Answer: A) 2 5 1 3

Explanation: The correct matching is as follows:
I. Gustafson Method – 2. Age from a tooth (The Gustafson method is used to estimate age from the development and eruption patterns of teeth)
II. Boyde’s Method – 5. Incremental lines (Boyde’s method involves the analysis of incremental lines in dental enamel for age estimation)
III. Haasis Rule – 1. Age from crown-heel length (The Haasis rule estimates age from the crown-heel length of fetal remains)
IV. Haderup System – 3. Charting of teeth (The Haderup system involves charting the characteristics of teeth for identification purposes)

Answer: B) Both (A) and (R) are correct.

Explanation: The assertion (A) that a stereoscopic microscope is used to determine the sequence of intersecting strokes in writing is true. Stereoscopic microscopes provide a three-dimensional view of the writing surface, allowing forensic document examiners to analyze the relative heights and overlapping patterns of intersecting strokes, which can reveal the sequence in which they were written. The reason (R) that a stereoscopic microscope enables the viewing of the thickness of strokes is also correct. The three-dimensional visualization provided by a stereoscopic microscope allows for the examination of the depth and thickness of writing strokes, which can provide valuable information about the writing instrument used and the writing process.

Answer-D

Explanation: The first chemical examiner’s laboratory in India was established in Madras (now Chennai) in the year 1849. This laboratory, known as the Chemical Examiner’s Laboratory, was set up by the British colonial government to provide scientific analysis and examination of evidence related to criminal cases. It played a crucial role in the development of forensic science in India and laid the foundation for the establishment of similar laboratories in other parts of the country.

Answer-D

Explanation: Finger print examination is associated with the following individuals:

• i) Marcello Malpighi (1628-1694): An Italian biologist and physician, he was one of the earliest scientists to study the ridges on the skin of fingers and palms.
• iii) Sir Francis Galton (1822-1911): An English polymath, he established the first scientific basis for the use of fingerprints as a means of identification. He studied the uniqueness and permanence of fingerprints and developed the first classification system for fingerprints.
• iv) Johannes Evangelista Purkinje (1787-1869): A Czech anatomist and physiologist, he is credited with introducing the first scientific nomenclature for the various patterns found in fingerprints.

In the context of forensic science, A. S. Curry is known for his work related to poison examination, making significant contributions to the field of toxicology. Goddard is recognized for his pioneering work in forensic ballistics, which involves the examination of evidence related to firearms and ammunition. Cherill has been associated with fingerprint analysis, a key aspect of personal identification in forensic investigations. Lastly, Hilton has made his mark in the domain of document examination, scrutinizing handwriting, signatures, and other aspects of questioned documents.

Answer-B

Explanation: When collecting a control soil sample for comparison with an incriminated soil sample from a foot print, it is recommended to collect the control sample from about 2-3 inches away from the foot print. This distance is close enough to ensure that the control sample represents the soil composition and characteristics of the area where the foot print was found, but far enough to avoid contamination from the foot print itself. Collecting the control sample from the foot print or too far away may lead to inaccurate comparisons and unreliable results.

Answer-C

Explanation: Physical evidences at the scene of crime should be collected in the presence of two independent witnesses. This is a standard practice in forensic investigations to ensure transparency, maintain the integrity of the evidence collection process, and minimize the potential for allegations of tampering or mishandling of evidence. Having two independent witnesses observing the collection process adds credibility and helps establish a chain of custody for the evidence. These witnesses can later testify in court about the procedures followed during evidence collection, if required.

Answer-C

Explanation: Both the assertion and the reason are correct. In an electron microscope, a high vacuum is maintained to prevent the electrons from colliding with air molecules, which would impede their movement and reduce the resolution of the microscope. The vacuum environment allows the electrons to travel uninterrupted and maintain their high energy and velocity, enabling the microscope to achieve high magnification and resolution.

Answer-D

Explanation: Hidden metallic objects can be detected using hard X-rays. Hard X-rays have higher energy and shorter wavelengths compared to soft X-rays, allowing them to penetrate through materials more effectively. When hard X-rays pass through an object, they interact with the metallic components, creating a distinct contrast or absorption pattern that can be detected and used to identify the presence of hidden metallic objects. This technique is commonly used in security screening applications, such as airport scanners and cargo inspection systems.

Answer-A

Explanation: A bolometer is a type of thermal detector used to measure the power of incident electromagnetic radiation. It is commonly used as a detector in infrared (IR) spectrophotometers. The bolometer operates by absorbing the infrared radiation, which causes a temperature change proportional to the intensity of the radiation. This temperature change is then measured and converted into an electrical signal, allowing the quantification of the infrared radiation. Bolometers are widely used in IR spectroscopy due to their high sensitivity and broad spectral response in the infrared region.

The correct increasing order of the given chromatographic examination techniques is:

1. Column Chromatography: A classic separation technique where a mixture is dissolved in a mobile phase and passed through a stationary phase in a column, allowing components to separate based on their differential affinities for the stationary phase.
2. GLC (Gas-Liquid Chromatography): A type of chromatography where the mobile phase is a gas and the stationary phase is a liquid, used for separating and analyzing volatile compounds.
3. HPLC (High-Performance Liquid Chromatography): A highly efficient and sensitive technique that uses a liquid mobile phase and a solid stationary phase, pumped under high pressure to achieve better separation and resolution.
4. HPTLC (High-Performance Thin-Layer Chromatography): A modern and advanced version of traditional thin-layer chromatography, offering improved separation efficiency, automation, and quantitative analysis capabilities.

Answer-C

Explanation: The Rh antigen in blood is also known as the D antigen. The Rh (Rhesus) blood group system is named after the Rhesus monkey, in which the Rh antigen was first discovered. The presence or absence of the D antigen on the surface of red blood cells determines an individual’s Rh status, either Rh-positive (D antigen present) or Rh-negative (D antigen absent). The Rh factor is an important consideration in blood transfusions and during pregnancy due to the potential for hemolytic disease of the newborn caused by Rh incompatibility.

Answer-D

Explanation: The cellular proteins in blood are PGM (Phosphoglucomutase) and GC (Group-specific component). PGM is an enzyme found in red blood cells and other cells, while GC is a vitamin D-binding protein present in serum. These proteins can be used for various forensic purposes, such as identifying the source of biological fluids or determining the presence of genetic markers.

Answer-D

Explanation: Both the assertion and the reason are correct. Vomited blood is acidic in reaction due to the action of gastric juice in the stomach. Gastric juice contains hydrochloric acid, which gives it a low pH (acidic). When blood is vomited, it mixes with the acidic gastric juice, resulting in an acidic reaction.

Answer-D

Explanation: The correct decreasing order of the given methods of blood examination is:

1. DNA analysis: This is the most advanced and definitive method for identifying individuals and determining the source of biological evidence.
2. Protein enzyme estimation: This method involves analyzing the activity and concentration of various enzymes and proteins present in blood samples.
3. Percipitin test: This serological test is used to detect the presence of specific antigens or antibodies in blood samples.
4. Crystal test: This is a relatively simple and less specific method that involves observing the crystal patterns formed by blood samples under a microscope.

The correct match between the lists is as follows:

• (a) MN – (ii) Red cell antigen: The MN blood group system is a set of antigens found on the surface of red blood cells.
• (b) ESD – (iii) Red cell isoenzyme: ESD stands for Esterase D, which is an isoenzyme found in red blood cells.
• (c) GC – (iv) Serum protein: GC is a vitamin D-binding protein found in serum.
• (d) HLA – (i) WBC: HLA (Human Leukocyte Antigen) is a protein found on the surface of white blood cells (WBCs).

Answer-B

Explanation: The adulteration of gasoline with kerosene oil can be detected by Gas-Liquid Chromatography (GLC). GLC is a powerful analytical technique that separates and identifies the components of a mixture based on their boiling points and interactions with the stationary phase. When a gasoline sample adulterated with kerosene is analyzed by GLC, it will show distinct peaks corresponding to the various hydrocarbons present in both gasoline and kerosene, allowing for the detection of the adulteration.

Answer-D

Explanation: Diacetyl morphine is also known as heroin. Heroin is a semi-synthetic opioid drug derived from morphine, a naturally occurring substance found in the opium poppy plant. Diacetyl morphine is the chemical name for heroin, which is one of the most potent and addictive illicit drugs. It is classified as a Schedule I controlled substance in many countries due to its high potential for abuse and severe health risks associated with its use.

The correct match between the lists is as follows:

• (a) Heroin – (ii) Junk: “Junk” is a common street name for heroin.
• (b) Marijuana – (iv) Pot: Marijuana is often referred to as “pot” or “weed” on the street.
• (c) Amphetamine – (iii) Up: Amphetamines are stimulants that produce an “up” or energetic effect, hence the street name “up.”
• (d) Phencyclidine – (i) Angel dust: Phencyclidine (PCP) is a dissociative drug commonly known as “angel dust” on the street.

Answer-B

Explanation: Botulism is a form of food poisoning caused by the neurotoxin produced by the bacterium Clostridium botulinum. It is a severe and potentially life-threatening illness that can affect the nervous system and cause paralysis. Botulism is typically caused by consuming contaminated food products, such as improperly canned or preserved foods, where the botulinum toxin has been produced by the bacteria. Proper food handling, cooking, and storage practices are essential to prevent botulism.

Answer-A

Explanation: The correct order with increasing quantity of THC (Tetrahydrocannabinol, the primary psychoactive component in cannabis) in Cannabis sativa is:

1. Bhang: Bhang is a preparation made from the leaves and seeds of the cannabis plant, containing relatively low levels of THC.
2. Ganja: Ganja refers to the dried flowers and buds of the cannabis plant, which have higher THC content than bhang.
3. Charas: Charas is a handmade hashish made from the resinous trichomes of the cannabis plant, containing a higher concentration of THC than ganja.
4. Hashish oil: Hashish oil, also known as hash oil or cannabis oil, is a highly potent cannabis extract containing the highest levels of THC among the listed options.

Answer-B

Explanation: A carbine is a lightweight, compact rifle typically used by military and law enforcement personnel. The usual barrel length of a carbine is around 12 inches (12″). This shorter barrel length compared to a standard rifle makes the carbine more maneuverable and easier to handle in close-quarters scenarios, while still providing effective range and accuracy for its intended purposes.

Answer-A

Explanation: In an improvised shotgun, the cylinder at the muzzle end of the barrel typically has a constriction of 1/1000 inch (0.001 inch or 0.0254 mm). This constriction, also known as a choke, is designed to control the spread of the shotgun pellets as they exit the barrel. A 1/1000 inch constriction is considered a tight or full choke, which results in a more concentrated and focused shot pattern, useful for long-range shooting.

Answer-D

Explanation: Both the assertion and the reason are correct. The diameter of the chamber in a firearm is designed to be slightly greater than the diameter of the cartridge to be fired. This clearance is intentional and allows for the slight expansion of the cartridge case when the propellant is ignited and generates high pressure during the firing process. If the chamber were the same size as the cartridge, the expansion could cause the case to rupture or become stuck, potentially causing a dangerous situation.

Answer-B

Explanation: The Walker test, also known as the paraffin test, is a forensic technique used to detect the presence of nitrites, which are a component of gunshot residue (GSR). When a firearm is discharged, the burning of the propellant produces nitrites that can be deposited on the shooter’s hands or clothing. The Walker test involves treating the suspect’s hands or clothing with a chemical solution that reacts with nitrites, producing a distinctive color change. This test can provide circumstantial evidence that an individual may have recently fired a gun.

Answer-C

Explanation: PETN stands for Penta Erythritol Tetranitrate, which is a powerful explosive compound. It is a nitrate-based explosive material commonly used in detonators, booster charges, and as a component in various explosive compositions. PETN is known for its high sensitivity to impact and friction, making it useful in initiating explosions but also requiring careful handling and storage.