UGC NTA NET/JRF Exam, Forensic Science, December-2023

The different types of volatile data present in a computer include CPU cache, CPU registers, and RAM data. Volatile data refers to information that is lost when the computer is powered down.

CPU cache and registers are small, fast memory locations directly within the CPU, which store data temporarily for quick access. RAM (Random Access Memory) is also volatile, storing data temporarily while a computer is running.

In contrast, hard disks and pen drives are non-volatile storage, retaining data even when the computer is turned off. Therefore, the correct combination includes only the truly volatile data types.

Fingerprint impressions and footwear impressions can prove that a suspect was present at the crime scene. Fingerprint impressions are unique to each individual and can be matched to a suspect's prints, directly linking them to the scene.

Footwear impressions can also be unique due to wear patterns and specific shoe characteristics, tying the suspect to the location.

Tool marks and tire marks can indicate the use of specific tools or vehicles but do not directly prove the suspect's presence, as they can be linked to objects rather than individuals. Thus, fingerprints and footwear impressions are more directly indicative of a suspect's presence.

The identification of an unknown writing depends on the similarity between the writing habits manifested in it and in the known writings, as well as the nature and range of variation in the known and unknown writings.

Handwriting analysis involves comparing the unique characteristics and idiosyncrasies in a person's writing, such as stroke patterns, pressure, and letter formation. Writing variation is a natural aspect that must be considered to ensure accurate identification.

Non-admitted standards and disregarding writing variation would not provide a reliable basis for comparison. Hence, similarity and variation analysis in known and unknown writings are essential for accurate identification.

In the estimation of age, the degree of formation of root and crown structure, the intermixture of temporary and permanent teeth, and long bones such as the tibia are considered.

The formation of root and crown structures provides information about dental development stages, which are useful in age estimation, especially in children and adolescents.

The intermixture of temporary (baby) teeth and permanent teeth can indicate specific age ranges. Long bones, including the tibia, provide data on bone growth and ossification stages, which are critical for estimating age in forensic anthropology.
The clavicle bone is also used but not as commonly as these other indicators.

In the majority of high-powered rifles, the mouth of the case in which the bullet is sealed is necked down to a smaller diameter than the rest of the case, resulting in a bottle-shaped appearance.

This design allows for a larger propellant charge behind a smaller caliber bullet, increasing the pressure and velocity of the bullet when fired.

Necking down creates a smaller diameter at the neck, which supports the bullet, while the wider case base holds more propellant.

This does not result in parallel walls, and the primary purpose is to accommodate the propellant effectively and increase the bullet's velocity.

Different injury patterns arise from bullet wounds than shotgun pellet wounds, high-speed bullets from military rifles cause more damage than low-speed bullets from handguns, and some gunshots penetrate the body but do not exit.

Bullet wounds tend to be more focused, causing deep penetration and potential exit wounds, while shotgun pellets disperse, creating multiple entry points and wider tissue damage.

Military rifles' high-speed bullets carry more kinetic energy, leading to greater tissue disruption compared to the slower bullets from handguns. Not all gunshot wounds result in an exit wound; some bullets lodge within the body.

Firearm injuries are not considered sharp cut wounds, and different wound patterns arise from bullets versus shotgun pellets, not similar ones.

The correct combination of types of explosives and ions present in them includes black powder explosive, which contains K⁺, NO₃⁻, NO₂⁻, and Hₛ⁻ ions, and Tovex explosive, which contains NH₄⁺, NO₃⁻, and NMAT ions.

Black powder, also known as gunpowder, typically consists of potassium nitrate (KNO₃), charcoal, and sulphur, resulting in these ions upon combustion.

Tovex is a water gel explosive composed of ammonium nitrate (NH NO) and other ingredients, including NMAT (Nitroamine). ANFO explosive, primarily composed of ammonium nitrate and fuel oil, does not contain the ions listed in option (c).

Smokeless powder explosives do not typically contain HCO₃⁻ ions (d). Therefore, (a) and (b) are the correct combinations.

The File Allocation Table (FAT) file system includes FAT 12, FAT 16, and FAT X. FAT 12 and FAT 16 are older versions used in earlier storage devices and operating systems.

FAT X is a version used in some specific applications like the Xbox gaming console.

FAT 320 and FAT Z are not recognized types within the FAT file system. Therefore, the correct combination is (a), (b), and (e).

The correct combination of substances and the tests for their detection includes cannabis, which can be identified through a microscopic test for cystolithic and glandular hair, and LSD, which is detected using Van Urk's reagent test.

The Marquis test is used for detecting opiates and amphetamines, not benzodiazepines. The Duquenois-Levine test is used for detecting cannabis, not Nux vomica. The Scott test is used for detecting cocaine, not antimony. Therefore, (c) and (e) are the correct combinations.