<prompt> Choking is seen inRevolverPistolShot gunRifle  <response>: C Shotgun 4, 33- Parikh 6th Choking is the constrictive device present at the muzzle end of the shotgun. Stallete wound may be seen in - contact wound bullet entry wound. Tracer bullet leaves a visible mark so that a person can see it. Destructive power of bullet is determined by - velocity of bullet.Smokeless powderBlack powder or smoke producing powder Single base - Nitrocellulose Gun cotton Double base - Nitroglycerine plus nitrocellulose Triple base - Nitroglycerine, nitrocellulose and nitroguanidineConsists of Potassium nitrate 75 Sulphur Charcoal1015One gram of powder produces 3000 to 4500 cc of gas that consists of CO, CO2 nitrogen, hydrogen sulphide, hydrogen, methane etc. Gunpowder and or soot on heavily blood stained or dark coloured garments can be visualized by Infra red photography 