Mock Test Set-18 (Forensic Science)

Mock Test

Q1. Assertion (A) – Based on the size of the crime, crime scene can be classified into microscopic and macroscopic.

Reason (R) – A single microscopic crime scene is actually composed of many macroscopic sites.

Choose correct option based on the above:

a. A and R are both correct.

b. A and R are both incorrect.

c. A is correct but R is incorrect.

d. A is incorrect but R is correct.

ANSWER:

c. A is correct but R is incorrect

EXPLANATION:

Microscopic crime scene is smaller in size as compared to macroscopic. Thus, a single macroscopic scene is actually composed of many smaller microscopic scenes.

Q2. Modus operandi is governed by which of the following factors?

A. Criminal repeat behavior

B. Particular behavior

C. Signature or working pattern

D. Preferred method of operation

Choose the correct option:

a. A and B

b. C and D

c. B, C and D

d. A, B, C and D

ANSWER:

d. A, B, C and D

EXPLANATION:

Modu Operandi is defined as criminal repeat behavior, and this particular behavior represents their signature or preferred method of operation.

Q3. Which of the following cannot help in determining the speed of a vehicle?

a. Glass fracture patterns

b. Vehicle damage

c. The radius of curved scuff marks

d. The length of skid marks.

ANSWER:

a. Glass fracture patterns

EXPLANATION:

Glass fracture patterns help to analyze the force, direction and cause of impact in crime like break-ins, shootings and accidents.

They are of different types-

1. Radial fractures – spoke like cracks that start opposite the impact side.

2. Concentric fractures – circular cracks around the impact point, forming after radial fractures.

3. Hackle marks – tiny ridges along fractures, indicating direction of force.

Q4. GHB and Rohypnol are central nervous system depressants often used by criminals for?

a. Hanging

b. Sexual assault

c. Abortion

d. Suicide

ANSWER:

b. Sexual assault

EXPLANATION:

GHB, Gamma Hydroxy Butyrate, ketamine and flunitrazepam, also called rohypnol are the most commonly used date rape drugs, also known as club drugs.

Q5. Which of the following is the process of collection and packaging of firearms?

a. Encase in plastic envelope, unload and detach the firearm, process for fingerprints, seal in cloth envelope

b. Seal in cloth envelope, unload and detach the firearm, process for fingerprint, encase in plastic envelope.

c. Unload and detach the firearm, process for fingerprint, encase in plastic envelope, seal in cloth envelope.

d. Process for fingerprint, unload and detach the firearm, encase in plastic envelope, seal in cloth envelope

ANSWER:

c. Unload and detach the firearm, process for fingerprint, encase in plastic envelope, seal in cloth envelope

Q6. The use of restriction enzymes in DNA fingerprinting is

a. To prevent DNA from being amplified

b. For DNA synthesis

c. To cut DNA into fragments of varying lengths

d. To repair DNA

ANSWER:

c. To cut DNA into fragments of varying lengths

EXPLANATION:

Restriction enzymes are special proteins that cut DNA at specific sequences. They are also known as restriction endonucleases.

Q7. In a DNA profile, null alleles arise as a result of?

a. Allele drop out

b. Allele drop in

c. Low pH

d. High pH

ANSWER:

a. Allele drop out

EXPLANATION:

Allele drop out is a commonly occurring phenomenon that occurs when DNA is inadequate. It happens when one allele may be preferentially amplified over the other.

Allele drop in is seen when small number of low STR alleles appear that are not derived from the donor sample to the profile. It occurs because of sporadic contamination events.

Null alleles, also knows=n as silent alleles, are non-functional allele caused by failure in amplification during PCR reaction which could be due to a genetic mutation.

Q8. “Nothing is immutable” is defined by which of the following?

a. Locard’s theory

b. The law of individuality

c. The principle of comparison

d. The law of progressive change

ANSWER:

d. The law of progressive change

EXPLANATION:

 The law of progressive change states that everything undergoes gradual changes over time due to environmental, chemical or physical factors.

Q9. Who developed voiceprint technique?

a. David Gray

b. Ashlee Kopp

c. Lawrence A Farwell

d. Lawrence Kersta

ANSWER:

d. Lawrence Kersta

Q10. Which of the following types of evidence can be packaged in a mylar bag?

a. Biological fluids

b. Firearms

c. Documents

d. Explosive residues

ANSWER:

e. Explosive residues

EXPLANATION:

For explosive residue, fire debris or flammables, common collection means are airtight containers of metals or glass or heat-sealed or resealable nylon or mylar bags.

Author:- Bhawana Sharma