Mock test Set-6

Q1. Which type of DNA polymorphism is analyzed in mitochondrial DNA (mtDNA) typing?

a) SNP (Single Nucleotide Polymorphism)
b) STR (Short Tandem Repeat)
c) VNTR (Variable Number Tandem Repeat)
d) RFLP (Restriction Fragment Length Polymorphism)

Answer: a) SNP (Single Nucleotide Polymorphism)
Explanation: Mitochondrial DNA (mtDNA) analysis often focuses on SNPs due to their high mutation rate and maternal inheritance pattern, which makes them useful in forensic investigations.

Q2. In forensic toxicology, which analytical technique is most appropriate for detecting and quantifying trace levels of drugs and poisons in biological samples?

a) High-Performance Liquid Chromatography (HPLC)
b) Gas Chromatography-Mass Spectrometry (GC-MS)
c) Ultraviolet Spectroscopy
d) Thin Layer Chromatography (TLC)

Answer: b) Gas Chromatography-Mass Spectrometry (GC-MS)
Explanation: GC-MS is highly sensitive and specific, making it the preferred method for detecting and quantifying trace levels of drugs and poisons in forensic toxicology.

Q3. Which of the following is a hallmark of a manual strangulation homicide?

a) Petechial hemorrhages
b) Hyoid bone fracture
c) Defensive wounds on the hands
d) Ligature marks on the neck

Answer: b) Hyoid bone fracture
Explanation: A fractured hyoid bone is a common indicator of manual strangulation, while petechial hemorrhages can occur in various types of asphyxia.

Q4. The Kastle-Meyer test is used to detect the presence of:

a) Saliva
b) Blood
c) Semen
d) Urine

Answer: b) Blood
Explanation: The Kastle-Meyer test is a presumptive blood test that uses phenolphthalein and hydrogen peroxide to detect the presence of hemoglobin.

Q5. What is the significance of the Becke line test in forensic science?

a) To determine the blood type of a sample
b) To analyze the chemical composition of a drug
c) To assess the refractive index of glass
d) To identify the presence of semen

Answer: c) To assess the refractive index of glass
Explanation: The Becke line test is used to determine the refractive index of glass fragments, which can help match them to a source.

Q6. In forensic entomology, the term "postmortem interval" refers to:

a) The time elapsed since death
b) The age of insect larvae found on a corpse
c) The time taken for decomposition to start
d) The period between death and discovery of the body

Answer: a) The time elapsed since death
Explanation: Postmortem interval (PMI) is the time that has passed since a person has died, often estimated using insect development stages.

Q7. Which substance is used as a matrix in Matrix-Assisted Laser Desorption/Ionization (MALDI) mass spectrometry?

a) Acrylamide
b) Sinapinic acid
c) Silver nitrate
d) Coomassie Brilliant Blue

Answer: b) Sinapinic acid
Explanation: Sinapinic acid is commonly used as a matrix in MALDI-MS to facilitate the ionization and detection of large biomolecules.

Q8. Which of the following is considered a confirmatory test for the presence of blood?

a) Luminol test
b) Leucomalachite green test
c) Takayama test
d) Kastle-Meyer test

Answer: c) Takayama test
Explanation: The Takayama test is a confirmatory test for blood, as it produces specific hemochromogen crystals when blood is present.

Q9. The term "medullary index" in hair analysis refers to:

a) The ratio of the medulla's diameter to the entire hair's diameter
b) The percentage of keratin in the hair shaft
c) The number of cuticle scales per inch of hair
d) The length of the hair shaft

Answer: a) The ratio of the medulla's diameter to the entire hair's diameter
Explanation: The medullary index is used to differentiate between human and animal hair based on the relative size of the medulla.

Q10. Which of the following is a key characteristic of a contact gunshot wound?

a) Abrasion collar
b) Soot deposition inside the wound
c) Tattooing around the wound
d) Stellate tears

Answer: b) Soot deposition inside the wound
Explanation: A contact gunshot wound often exhibits soot deposition and powder burns inside the wound due to the close proximity of the firearm.

Content writer:- Srishti Dutta