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The primary high explosives which is used in percussion cup of cartridge is :

  • A.Lead azide
  • B.TNT
  • C.PETN
  • D.RDX

Answer: A

The primary high explosive here is lead azide.

A percussion cap or primer must explode when struck, so it uses a primary (initiating) explosive that detonates from a mild shock or friction. Lead azide is such an explosive, and it is used with or alongside lead styphnate in primers and detonators.

TNT, PETN and RDX are secondary high explosives. They are relatively insensitive and need a detonator to set them off, which is why they are used as main charges and boosters rather than in percussion caps.

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