December 2015 UGC NET Examination Forensic Science Paper 3 Questionnaire, followed by the Solution Key

In the realm of crime investigation, forensic science plays a crucial role in uncovering the truth. Here are some fascinating facts about various forensic techniques and their applications.

The Parotid gland, a salivary gland located in the lower part of the cheek, produces amylase, an enzyme that helps break down starches in food. In the forensic context, the presence of amylase in saliva can be used to identify certain individuals.

In the investigation of digital crimes, items like laptops and pendrives found at the scene should be seized. However, login and passwords may not be requested from the laptop owner present at the scene.

Cotton, with the aid of plastic rods, dried and sealed in cellophane envelopes, is used to lift gunshot residue. This technique is invaluable in forensic investigations, helping to identify the presence of gunshots.

The bullets loaded in high-velocity rifle cartridges, such as those fired from an AK-47 rifle or 5.56 mm Insas rifle, have steel cores. This information can be used to identify the type of weapon used in a crime.

Infrared spectroscopy is a technique used to determine the generic groups to which fibers belong. It is also useful in separating fibers within generic groups based on differences in copolymer composition.

Blood spatter is a valuable tool in determining the origin of blood. From an elliptical blood drop found at the scene of a crime, its angle of fall can be calculated using the formula sinA = a/b, where 'a' is the width and 'b' is the length of the elliptical stain.

The pigments in hair are formed by two types of melanin: black-brown eumelanin and red-yellow pheomelanin. These melanins are produced by melanocytes in the hair follicles and deposited into the hair shaft.

In the world of forensic genetics, DNA analysis is a powerful tool. One of the key loci used in DNA typing is the amelogenin locus. This locus is found on both the X and Y chromosomes and can be used to determine the gender of an individual.

The ethanol saliva: blood ratio equilibrates at about 30 minutes after cessation of drinking under normal conditions. This information can be used to estimate the time of last consumption of alcohol.

In the realm of chemistry, another limiting law apart from Beer's law is the Debye-Huchel law. This law is used to describe the scattering of waves and is crucial in various spectroscopic techniques.

In the investigation of physical evidence, it is important to note if the evidence has been contaminated. If contamination occurs, the investigator must record this fact.

In the field of forensic anthropology, changes in the pubic symphysis can help in age determination. This information can provide valuable insights into the age of the deceased.

In the analysis of writing, the relative age of writing strokes with folds may be indicated by intersecting writing strokes with folds in the paper. This technique can help in determining the sequence of events at a crime scene.

In the investigation of biological evidence, DNA typing of feces has not proven very successful due to the presence of large amounts of bacteria and digestive enzymes that degrade DNA.

In the world of spectroscopy, Crompton scattering results in interference with the resulting signal. This phenomenon can affect the accuracy of spectral analysis and must be taken into account.

In the investigation of tool marks, it is important to note that no two tools, even of the same make and batch, will have identical surfaces. This individualistic nature of tool marks can be used to identify the tool used in a crime.

In the field of radiochemistry, Neutron Activation analysis involves making the nucleus unstable. This technique is used to identify and quantify the elements present in a sample.

In the world of forensic genetics, the Feulgen reaction can detect the X-chromosome, which appears as a bright yellow spot. However, it cannot detect the Y-chromosome.

In the realm of forensic pathology, Nobbing Fractures are typically seen in Battered baby syndrome. These fractures are caused by repeated and forceful impacts, often indicative of child abuse.

In the field of forensic chemistry, the Langmuir phenomenon is a phenomenon in which a gas or vapour comes in contact with an adsorbent, and a certain amount of it gets adsorbed on it. This phenomenon is crucial in various adsorption-based techniques.

In the world of forensic handwriting analysis, forged writings are always inferior to genuine writings because no writer can have better penmanship than themselves.

In the investigation of latent fingerprints, 'Sticky Side Powder' is used to develop latent fingerprints on adhesive tapes. This technique is invaluable in forensic investigations, helping to identify individuals who may have handled evidence.

In the field of forensic pathology, 'Sticky Side Powder' is used to develop latent fingerprints on adhesive tapes. This technique is invaluable in forensic investigations, helping to identify individuals who may have handled evidence.

In the world of forensic chemistry, alpha-amylases in humans are found in both saliva and the pancreas. However, forensic tests for saliva relied primarily on the detection of beta-amylase, which is not present in humans.

In the realm of forensic pathology, Incised looking lacerations are caused when skin is sandwiched between a weapon and bone, but they are not caused by a sharp weapon. This information can provide valuable insights into the nature of injuries sustained during a crime.

In the world of forensic anthropology, the Christmas tree stain is a common name for the staining technique containing picroindi-gocarmine (PIC) and Nuclear Fast Red dyes. This technique is used to visualize and analyse bone tissue.

In the field of forensic soil analysis, the forensic definition of soil is a mixture of mineral grains, organic matter, and any other material mixed with the sample. This definition is crucial in the analysis of soil evidence found at a crime scene.

In the realm of forensic biology, Cats do not have spinous or petal-like scales in the cuticle, a portion of hair. This information can be used to differentiate cat hair from human or other animal hair.

In the field of forensic chemistry, Inside the human body, cyanide attaches to cytochrome-C oxidase, which has a high affinity for Fe ions. This information can be used to detect the presence of cyanide in biological samples.

In the world of forensic genetics, the energy of a photon is directly proportional to its frequency. This information can be used to determine the wavelength of light used in various spectroscopic techniques.

In the field of forensic anthropology, changes in the pubic symphysis help in age determination. This information can provide valuable insights into the age of the deceased.

In the realm of forensic pathology, the Greenish discoloration of the right iliac fossa is the earliest putrefactive change, and honeycomb liver is not seen in Putrefaction. This information can help in determining the time since death.

In the field of forensic dentistry, the Anagen phase is the stage during which the hair root is growing continuously. This information can be used to determine the age of the hair and, by extension, the age of the individual.

In the world of forensic genetics, (iii) Amelogenin locus, (iv) Stutter bands, and (i) DNA analysis are key techniques used in forensic investigations. These techniques are invaluable in identifying individuals and providing evidence in criminal cases.

December 2015 UGC NET Examination Forensic Science Paper 3 Questionnaire, followed by the Solution Key