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

The Mettler hot stage microscope and the Glass Refractive Index Measurement (GRIM) are both techniques used to examine the refractive index of glass fragments.

The Mettler hot stage microscope utilizes hot stage microscopy, a technique that observes changes in physical properties at various temperatures. The GRIM system specifically measures the refractive index of glass particles to a high degree of precision.

Isopolar pollen grains have identical proximal and distal poles. This means that there's a symmetry across the equatorial plane of the grain.

Proximal and distal relate to the pollen's orientation in relation to the plant proximal is closer to the attachment point to the plant, and distal is further away.

For dispatch of Mobile Phone device, it is best to use anti-static bags and electrostatic bags. These types of bags are designed to protect electronic devices from electrostatic discharge and other damages that can occur during transport and handling.

They prevent the buildup of static electricity which can cause harm to the electronics within the devices.

Behavioral biometrics refers to the unique ways in which individuals act, including physical and mental patterns of behavior.

This includes signature (how a person signs their name), keystroke dynamics (the unique manner and rhythm in which a person types), and lip motion (unique ways in which a person moves their lips when speaking).

Level-3 features in automated fingerprint identification include sweat pores, edges of the ridges, and incipient ridges. These are minute details that can be used to enhance fingerprint identification accuracy.

They are more specific and individual than level-1 (pattern type and ridge flow) and level-2 (minutiae) features, thereby providing more reliable and definitive identification.

Release agents such as talcum powder and silicone spray are commonly used during the casting of shoe prints to prevent the casting material from sticking to the print.

These agents provide a barrier between the substrate (the surface containing the shoe print) and the casting material, allowing for a cleaner and more detailed cast.

Oxalic acid has a bleaching or immediate color-changing effect on Iron-gall inks and Logwood inks. Iron-gall ink, a type of ink historically made from iron salts and tannic acids, reacts with oxalic acid, which can cause it to fade or change color. Similarly, Logwood ink, made from the logwood tree, also reacts to oxalic acid.