Weapon Types & Their Operations: Forensic Ballistic MCQ Ex 1.4

21. In Ballistics, the datum line refers to the?

1. Dent at the breech end
2. Irregularity in the grooves of the bore
3. A point that stops the forward motion of the cartridge
4. A dent at the face of the bullet helps in forensic identification

22. What is Headspace in firearm ballistic?

1. Distance b/w the datum line to the muzzle end of the barrel
2. Distance b/w the datum line to trigger spur
3. Distance b/w the trigger spur to the muzzle end
4. Distance b/w the datum line to the face of the bolt

23. For a rimmed cartridge, headspace can be measured from?

1. Distance b/w the front of the bolt to the back of the barrel.
2. Distance b/w the back face of the barrel to the face of the breech
3. Distance b/w back of the barrel to the clearance point.
4. Both (1) and (2)

24. For Belted cartridges, the headspace can be calculated as:

1. Distance between the datum point and face of the bolt
2. Distance between the datum point and face of the cartridge case
3. Distance between rim seat and datum line
4. Distance between the rim seat and face of the bolt

25. For a Straight-walled cartridge, the headspace is the distance between?

1. Cartridges lip to tips of bullet
2. Cartridges lip to the tips of the muzzle end
3. Cartridges lip to the face of the bolt
4. Cartridges lip to datum lines

26. Which is not a type of Headspace gauge based on their sizes?

1. Wired
2. Go
3. No-go
4. Field

27. Which of the following is the muzzle attachment?

(i) Sound suppressor (ii) Recoil reducers (iii) Flash hiders (iv) Recoil boosters

Codes:

1. Only (i) and (ii)
2. Only (ii) and (iv)
3. Only (i), (ii), and (iii)
4. All of the above

28. Arrange the following in order of loudness when ammunition is fired from a general rifle?

1. Sound of supersonic crack> Pressure wave> Mechanical Noise (hammer)> Bullet Flight Noise
2. Sound of supersonic crack> Mechanical Noise (hammer)> Pressure Wave> Bullet Flight Noise
3. Sound of Pressure Wave> Supersonic Crack > Mechanical Noise (hammer)> Bullet Flight Noise
4. Sound of Pressure Wave> Mechanical Noise (hammer)> Supersonic Crack > Bullet Flight Noise

29. Assertion (A): A suppressor reduces the noise of pressure waves.
Reason (R): It slows the release of high-pressure propellant gases by expansion and turbulence.

1. Both (A) and (R) are correct
2. (A) is correct, but (R) is incorrect
3. Both (A) and (R) are incorrect
4. (A) is incorrect, but (R) is correct

30. What is the expected range of reduction of sound is seen when using a suppressor at the muzzle end of the barrel?

1. 09-15 dB
2. 18-32 dB
3. 18-23 dB
4. 27- 48 dB

31. Assertion (A): Recoil compensators and muzzle brakes are an important part of the function of semi-automatic and automatic guns.
Reason (R): It uses the propellant gases as a countering force to reduce the rinsing of the barrel and also to recoil the gun.

1. Both (A) and (R) are correct
2. (A) is correct, but (R) is incorrect
3. Both (A) and (R) are incorrect
4. (A) is incorrect, but (R) is correct

32. Assertion (A): Recoil compensator and muzzle brakes are the internal part of the barrel.
Reason (R): They reduce the upward movement of the firearm and decrease the recoiling of the gun.

1. Both (A) and (R) are correct
2. (A) is correct, but (R) is incorrect
3. Both (A) and (R) are incorrect
4. (A) is incorrect, but (R) is correct

33. Among Recoil compensators and muzzle brakes which is more efficient in reducing free recoil velocity?

1. Recoil compensators
2. Muzzle Brake
3. Depends upon the type of firearm
4. Recoil compensator is the other name of Muzzle brake

34. In ballistic, what do mean by the term “free recoil velocity”?

1. How fast a weapon reload itself
2. How fast the weapon comes back at the shooter
3. How fast the cartridge comes back to the bolt region
4. After firing, how fast empty cartridge exits out

35. In general, which types of bullets have smaller free recoil velocity?

1. Fast-moving small calibre bullets
2. Fast-moving higher calibre bullets
3. Slow-moving small calibre bullets
4. Slow-moving higher calibre bullets

36. In firearm ballistic, “Magna Porting” is term associated with?

1. Muzzle Brake
2. Recoil compensators
3. Silencer
4. Recoil Reducer

37. What is the uses of a recoil reducer?

1. To reduce the recoil
2. To reduce the upward rise of the muzzle
3. To reduce the pressure wave sound
4. Both (1) and (2)

38. Which of the following is the major disadvantage of a recoil reducer?

1. Decrease in bullet velocity
2. Decreases the combustion rate
3. Increase in noise
4. Increases the combustion rate which may cause blasting of the bullet in the barrel

39. About how much chemical energy from propellant is converted in K.E. for the actual movement of the projectile down the barrel?

1. About 20%
2. About 30%
3. About 60%
4. About 80%

40. Assertion (A): Flash hider is a very important muzzle attachment for night-time operations.
Reason (R): It reduces the extent of muzzle flash.

1. Both (A) and (R) are correct
2. (A) is correct, but (R) is incorrect
3. Both (A) and (R) are incorrect
4. (A) is incorrect, but (R) is correct

41. Apart from suppressing muzzle flash, what are the other functions of flash hiders?

1. Decreases the overheating of the chamber
2. Decreases the projectile speed
3. Reduces the pressure wave noise
4. Reduce the recoil

42. What are the uses of Muzzle counter weights in firearms?

1. To add stability in the sighting
2. To reduce the recoil
3. To reduce the upward motion of the muzzle
4. All of the above

43. In firearm ballistic, what do you mean by grenade discharger?

1. They are used to propel the rocket-propelled ammunition
2. They are used to laser mark the distant object
3. They are used to make throw pellets whose diameter is 1/3 inch
4. They are special breech-loading weapons that are used for hunting. 

44. In firearm ballistic, a recoil booster is used to?

1. Make the live ammunition load smoothly
2. Provide additional protection from recoil velocity
3. Decrease the intensity of muzzle flash
4. Increases the rate of fire

45. What does the term “in battery” means in ballistic?

1. The firearm that operated with a battery
2. Fully loaded magazine
3. Fully loaded guns with security lock
4. Fully loaded gun that is ready to fire

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