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Forensic Ballistics Questions and Answers

101.

Rifling marks on fired bullet are of the following type :

Exam Year(s)

UGC NET - 2013,

Answer: C

Rifling marks on a fired bullet are striation marks, formed as the lands of the barrel cut into the bullet and drag along it, and these are used for matching a bullet to a weapon. Cut marks, compression marks and integrated marks are not the standard terms for rifling marks, so striation marks (printed as 'Stration marks') is the correct choice.

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102.

In which weapon Iron pyrite was used as ignitor ?

Exam Year(s)

UGC NET - 2013,

Answer: B

The wheel lock gun used iron pyrite, which gave sparks when it was pressed against a rotating serrated steel wheel. The match lock used a burning slow match, the flint lock used a piece of flint striking a steel frizzen, and the percussion lock used a cap of fulminate. So only the wheel lock matches iron pyrite.

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103.

303 rifle cartridge is a

Exam Year(s)

UGC NET - 2013,

Answer: C

The .303 rifle cartridge is a centre fire cartridge: its primer sits in the centre of the base of the case and is struck by the firing pin there. A pin fire cartridge has a small pin protruding from the side, and a rim fire cartridge has the priming compound in the rim of the base, as in .22 ammunition. A blank cartridge is one with no bullet and is a type of load, not a type of ignition. Option C is correct.

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104.

The modified Griess Test is specific for determination of ________ in gunpowder residue.

Exam Year(s)

UGC NET - 2013,

Answer: D

The modified Griess test is specific for nitrite in gunpowder residue. In the test the residue reacts with sulphanilic acid and alpha-naphthylamine in an acid medium to give a red azo dye if nitrites are present. Nitrate must first be reduced to nitrite, so the test is directly specific for nitrite. Antimony and barium are metallic elements from the primer, tested for by other methods such as neutron activation, atomic absorption or the sodium rhodizonate test. Option D is correct.

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105.

The following mark is not found in fired cartridge case

Exam Year(s)

UGC NET - 2013,

Answer: B

The rifling mark is not found in a fired cartridge case, option (B), because rifling marks are made on the bullet as it goes through the grooves of the barrel. The cartridge case carries the firing pin mark on the primer, the breech face mark from the thrust of the case on the face of the breech, and the chamber mark from the walls of the chamber, so (A), (C) and (D) are found on the case. Examination of these marks under the comparison microscope lets the examiner say whether two cartridge cases were fired in the same weapon.

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106.

Zip guns are

Exam Year(s)

UGC NET - 2013,

Answer: A

Zip guns are country made guns, option (A), crude improvised firearms made from pipes, wood and nails or bits of metal, often by small makers, which fire a single round. They are not rifles, machine guns or carbines, which are factory-made military or sporting arms, so (B), (C) and (D) are wrong. Because they are made with no licence and no record, zip guns are a problem for the forensic examiner, who has to find the weapon's make from the crude marks left on the fired bullet.

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107.

In the gunshot wound, the term back spatter refers to

Exam Year(s)

UGC NET - 2013,

Answer: D

Back spatter refers to the ejection of blood and tissue from the entrance gunshot wound, option (D), backward toward the shooter, because the pressure of the gases and the temporary cavity inside the body forces material out of the way the bullet came in. The exit wound gives forward spatter, so (A) is wrong, and the projectile is not ejected from the entrance, so (B) and (C) are wrong.

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108.

Match the following :

List - IList - II
a. Fulminate of mercuryi. Nitroglyceron
b. Gelatine sticksii. Dart
c. Ballistiteiii. Primer
d. Air guniv. Double base smokeless powder

Codes : a b c d

Exam Year(s)

UGC NET - 2013,

Answer: C

The correct matching is fulminate of mercury with primer (iii), gelatine sticks with nitroglycerin (i), ballistite with double base smokeless powder (iv), and air gun with dart (ii), which is code (C). Fulminate of mercury is the sensitive explosive in primers, gelatine sticks contain nitroglycerin, ballistite is a double base powder of nitrocellulose and nitroglycerin, and an air gun can fire a dart. Codes (A), (B) and (D) swap two or more of these items.

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109.

The terminal velocity of falling 9 mm bullet is about

Exam Year(s)

UGC NET - 2013,

Answer: D

The key gives about 219 feet per second, option (D), as the terminal velocity of a falling 9 mm bullet, the speed which it reaches when the drag of the air equals its weight, as when a bullet fired straight up comes back down. This is far below the speed of a bullet leaving a barrel, and is too low to do real harm in most cases. The other values, 168, 282 and 198 ft/s, are not the figure of the key, so (A), (B) and (C) are wrong.

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110.

What is the effect of cutting of barrel on dispersion of pellets on a target ?

Exam Year(s)

UGC NET - 2013,

Answer: B

Cutting the barrel of a shotgun increases the dispersion of the pellets, option (B), by the key, because the choke, the narrowing at the muzzle that keeps the pellets together, is removed and the shot has less barrel in which to be guided. The pattern then opens out more quickly with distance. So (A) is the opposite of the right answer, (C) denies any effect, and (D), a single hole, would be seen only at a point blank range and not as a general effect.

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