Forensic Ballistics Topicwise Questions || Part- 7

Forensic Ballistics Topicwise Questions

Q1. Moveable fore-end is a part of which action firearm?

A)   Bolt action rifles

B)   Self loading rifles

C)   Short recoil rifles

D)   Pump action rifles

Answer: Pump action rifles

Explanation: A pump action rifles have moveable fore-end where the for-end can be moved forward and backward in order to eject a spent round of ammunition.Pump action rifles are also known as slide action and trombone action. Alexander Bain in 1854 was the first known person to patent slide action rifle.

Q2. Assertion (A): Delayed blowback mechanism handles the safety peak pressure level of the barrel by mechanical means at the time of firing.

Reason (R): It ensures the pressure that is produced by firing powerful ammunition falls to a safe level before the cartridge case exits out from the barrel.

A)   Both (A) and (R) are correct

B)   (A) is correct, but (R) is incorrect

C)   Both (A) and (R) are incorrect

D)   (A) is incorrect , but (R) is correct

Answer: Both (A) and (R) are true

Q3. For wound ballistics study in human beings, the following is used in experiments.

A)   20% gelatin gel block

B)   10% gelatin gel block

C)   30% gelatin gel block

D)   10% agar gel block

Answer: 20% gelatin gel block

Explanation: Ballistics gel powder is a scientific technical gelatin which when mixed to a specific density creates analog for human tissues.This is the only gelatin material that is accepted as evidence in court of law.Martin Fackler was first to invent ballistics gel powder.

10% (Standard): The standard mixture is the benchmark reference for forensic testing.This is made using 10% gel powder by weight and 90% water by weight (V).

20% (NATO - North Atlantic Treaty Organization): The NATO mixture is used for high velocity projectiles that are armor penetrating. This is made by using 20% gel powder by weight and 80% by water by weight (V).

The number refers to the density of ballistics gel,density is determined by how firm the gel is, higher the density the more the gel is.

Storage: Storage of gel should be in a dry place, sealed and out of sunlight.After casting of gel,keep it refrigerated until use.

Q4. What does “semi automatic” mean referring to firearm operations?

A)   The gun will fire continuously as long as trigger is held back

B)   Its built to fire twice with each pull of the trigger

C)   Its for military,policies and home defense use only

D)   It will feed live rounds automatically from the magazine to the chamber,but fire one by one only with each pull of trigger

 Answer: It will feed live rounds automatically from the magazine to the chamber,but fire one by one only with each pull of trigger

Explanation: Semiautomatic firearms were discovered by Ferdinand Ritter Von Mannlicher in 1885. Semiautomatic also called as self loading firearm or auto loading firearm also called as self loading firearm or auto loading firearm that automatically ejects and loads cartridges in its chamber after every shot fired.

Q5. Punishment for culpable homicide not amounting to murder is under which section of Indian Penal Code.

A)   Section 302 IPC

B)   Section 304 IPC

C)   Section 307 IPC

D)   Section 308 IPC

Answer: Section 304 IPC

Explanation: According to section 304 of IPC whosoever commits this type of crime,shall be punished with imprisonment for life, or imprisonment of either description for a term of which may extend to ten years, and shall also be liable to fine.

 Q6. Which statement is true for double - action revolver firearms?

A) Pulling trigger > fires > cock the hammer for the next round > rotates the cylinder > drops the hammer> fire next ammunition

B) Pulling trigger > cock the hammer > rotates the cylinder > pull the trigger (second time ) > drops the hammer > fire ammunition

C) Pulling trigger > cock of hammer > rotates the cylinder > drops the hammer > fire

D) Pulling trigger > rotates the trigger > cock the hammer > drops the hammer > fire

 Answer: C) Pulling trigger > cock of hammer > rotates the cylinder > drops the hammer > fire

Q7. The process of breaking the molecules of a chemical into atoms under pressure, the atoms recombining to form gasses, the whole phenomena taking place with extreme rapidity is called.

A) Brisance

B) Burning

C) Deflagration

D) Detonation

Answer: Detonation

Explanation: Alfred Nobel invented detonator in 1863.A detonator,is a device accompanied by violent disruption effect and intense high spread shockwaves.It is a rapid oxidation reaction including combustion process that produce waves higher than the supersonic speed.

Q8. Which of the organs is commonly affected by shock waves?

A) Heart

B) Lungs

C) Brain

D) Liver

Answer: Lungs

Explanation: August Toepler in 1859, was first to visualize the shock waves.The shock waves from the blast are more extensive damage to the air filled organs. This leads to the deformation of the thoracic wall and serves as a hemorrhage to the lungs.

Shock waves are pressure waves produced by moving through the air at a speed faster than the speed of sound.These waves can be produced by explosives. A ``sonic boom” is a sound associated with shock waves.

Q9 Attempt to murder comes under which section of IPC.

A)   Section 336 IPC

B)   Section 337 IPC

C)   Section 378 IPC

D)   Section 307 IPC

Answer: Section 307 IPC

Explanation: According to section 307 of IPC whosoever does any act with such intention or knowledge and under such circumstances that , if he by that act caused death , he would be guilty of murder,shall be punished with imprisonment of either description for a term which may extend to ten years, and shall also be liable to fine.

If hurt is caused to any person by such an act, the offender shall be liable either to imprisonment for life.

Q10. Picric acid is also known as

A)   Cyclo- trimethylene trinitramine

B)   Trinitrophenol

C)   Cyclo- tetramethylene tetranitramine

D)   None of the above

 Answer: Trinitrophenol

Explanation: Trinitrophenol is also called as 2,4,6- trinitrophenol,pale yellow,odorless crystalline solid that has been used as a military explosives.Peter Woulfe discovered picric acid in 1771.Percussion or rapid heating can cause it (salts with heavy metals,such as copper ,silver or lead) to explode.