Previous Year Paper Questions(NET/JRF-FORENSIC SCIENCE)

1. The cuticle, outer zone of hair, consists of-

Hemoglobin
Collagen
Myosin
Keratin

ANSWER-4

2. The slurry explosives are based on-

Nitrocellulose
Nitroglycerine
Ammonium nitrate
Potassium chlorate

ANSWER-3

EXPLANATION

Slurry explosive/water gel

· It is an aqueous solution of an inorganic oxidizer gelled with a carbonaceous gelling agent.

· These explosives consist of an inorganic oxidizer such as ammonium nitrate, or for better density control or sensitivity, mixtures of ammonium with sodium or calcium nitrate, gelled with a natural polysaccharide such as guar gum. Additional crystalline oxidizer and fuel is suspended in the gel matrix. Other ingredients may be added as fuels, sensitizers(enhance intiation), stabilizers, etc.

· Physical characteristics and composition of typical slurries and emulsions, combined with a systematic analytical approach, are used for the characterization and discrimination of intact gel/slurry and emulsion explosives.

3. Cherry-red discoloration of blood is due to-

Oxyhemoglobin
Red hemoglobin
Carboxyhemoglobin
Cyanometh hemoglobin

ANSWER-3

4. Takayama test, ferrous iron from hemoglobin reacts with pyridine to produce _____ crystals.

Red rhombic
Red feathery
Red circular
Green feathery

ANSWER-2

5. The first double-base propellant, used as smokeless powder, was invented by Alfred Nobel in 1888 by gelatinization of nitrocellulose with-

Diphenylamine
Picrite
Nitroglycerine
Ether-alcohol mixture

ANSWER-3

6. Battery cup is associated with which of the following?

Shotgun cartridge
Rim-fire cartridge
Centre-fire rifle cartridge
Pin-fire cartridge

ANSWER-1

EXPLANATION

Battery cup

· Primers for modern shotshells have an additional part; the battery cup supports & adds strength to the primer.

· It is made of copper, brass, or copper-plated steel.

· The shotshell anvil is larger than that of a rifle/handgun primer anvil.

· The anvil is a flat plate mounted perpendicular to the cup.

· Its leading edge rests against the inside of the battery cup.

· The battery cup is hollow and holds a significant volume.

· It is important to prevent finely granulated propellants from entering the cup.

· If this happens, the added pressure inside the cup at firing can damage the bolt or breechface of a shotgun.

· Thus, the opening (flashhole) through which flame and gas will pass is sealed with a thin, combustible paper or plastic disk before seating the anvil.

7. Green color code on time pencil indicates that the explosion will occur after approximately

30 minutes
5 hours
12 hours
30 hours

ANSWER-2

EXPLANATION

Time pencil

The period of delay is indicated by the colour of the safety strip. The timings given are for 59° Fahrenheit (15°celcius). The delay varies according to temperature. At high temperatures the delays are considerably shortened and vice versa.

Black	10min
Red	30min
White	2hrs
Green	5½hrs
Yellow	12hrs
Blue	24hrs

8. Forensic science laboratories in India are accredited by which of the following?

NAAC
NABL
CSIR
BARC

ANSWER-2

EXPLANATION

National accreditation board for testing and calibration laboratories

· National accreditation board for testing and calibration laboratories (NABL) is an accreditation body, with its accreditation system established in accordance with ISO/ IEC 17011.

· NABL provides voluntary accreditation services to:

· Testing laboratories in accordance with ISO/ IEC 17025 ‘general requirements for the competence of testing and calibration laboratories

· Calibration laboratories in accordance with ISO/ IEC 17025 ‘general requirements for the competence of testing and calibration laboratories

· Medical testing laboratories in accordance with ISO 15189 ‘medical laboratories -requirements for quality and competence’

· Proficiency testing providers (ptp) in accordance with ISO/IEC 17043 “conformity assessment — general requirements for proficiency testing” and Reference material producers (rmp) in accordance with ISO 17034 “general requirements for the competence of reference material producers”.

9. Triangular cross-section is seen in which type of hair?