Internal Ballistic MCQ With Answer and Explanation: Forensic Ballistic MCQs Ex 2.1

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1. Assertion (A): Diameter of the chamber in a firearm is slightly greater than the diameter of the cartridge to be fired.
Reason (R): It accommodates the expansion of the cartridge case during the firing process.

1. (A) is true, but (R) is false
2. (A) is false, but (R) is true
3. Both (A) and (R) are false
4. Both (A) and (R) are true

2. Pistols like the 9 mm Browning pistol are generally semi-automatic. In these pistols, which of the following is true at the instant of their firing?

1. The bolt is not locked to the barrel during firing, then the fired cartridge case and bolt both move backwards for unloading and reloading.
2. The bolt is locked to the barrel. First it gets unlocked from the barrel and then the fired cartridge case and bolt both move backwards for unloading and reloading.
3. Bolt is locked to barrel. Both move backwards and get separated when the pressure in the cartridge case reduces to a safe value. Then the process of unloading and reloading takes place.
4. Bolt is locked to barrel. Both move backwards to the full extent. Then the automatic mechanism of long recoil operation takes place.

3. The internal cross-sectional diameter of the barrel of a 10-bore gun is

1. More than that of 12-bore gun
2. Less than that of 12-bore gun
3. More than that of 8-bore gun
4. Less than that of 20-bore gun

4. The cutting of barrel length in shotgun causes:

1. Decrease in dispersion of pellets
2. Increase in dispersion of pellets
3. No change in dispersion of pellets
4. Distortion of pellets

5. The angle of rifling (θ), pitch of rifling (l) and calibre of a rifle (d) are connected by the following relation:

1. d = l/π tan θ
2. d = l/π cot θ
3. l = d/π tan θ
4. l = d/π cot θ

6. The formula for calculating the correct rate of twist for firearm was given by:

1. Gaspard Kollner
2. George Greenhill
3. Greener
4. Minie

7. The formula “(150 x (bullet diameter)²)/bullet length in inches” is used to determine :

1. The rate of twist for rifling
2. To determine the weight of bullet
3. To calculate the speed of bullet
4. To calculate the flight path of bullet

8. The bullet velocity of a .303 Mark VII cartridge fired from .303-rifle is 2440 ft/sec and the pitch of rifling is one turn in 10 inches. The rate of spin of the bullet when it leaves the muzzle is approximately:

1. 2560 revolutions per second
2. 2930 revolutions per second
3. 3360 revolutions per second
4. 3930 revolutions per second

9. Match the following:

List – I	List – II
(a) Ordinary shotgun	(i) 31/2 to 41/2 pound
(b) Pistol	(ii) 3-4 pound
(c) Revolver Double Action	(iii) 16-20 pound
(d) Service Rifle	(iv) 6-7 pound

	(a)	(b)	(c)	(d)
1.	(i)	(ii)	(iii)	(iv)
2.	(i)	(iv)	(ii)	(iii)
3.	(iii)	(iv)	(i)	(ii)
4.	(ii)	(i)	(iv)	(iii)

10. Pressure start curve inside the barrel determines:

(i) Temperature of projectile (ii) Trajectory of projectile (iii) Velocity of projectile (iv) Striking energy of projectile

1. (i) and (ii) are correct
2. (ii) and (iii) are correct
3. (iii) and (iv) are correct
4. (ii) and (iv) are correct

11. In recoil-operated firearms like a pistol, the automatic mechanism works because of

1. Force of recoil of firearm
2. Force of recoil acting on the head of the cartridge case
3. Force of recoil acting on the recoil plate of firearm
4. Force of recoil acting on walls and neck of the cartridge case

12. Which of the following is NOT a factor in measurement of recoil?

1. Weight of gun and bullet
2. Muzzle blast
3. Gases formed inside the cartridge case
4. Burning on target

13. Which of the following is not a result of rifling?

1. Increased speed
2. Increased range
3. Increased precision
4. Increased yaw

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