This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Inorganic Chemical – Explosives”.
1. Which one mentioned below is one of commercial explosives?
a) HMTD
b) Dynamite
c) RDX
d) C4
View Answer
Explanation: Three types of explosives are available- military explosives, commercial explosives and improvised explosives. Examples of commercial explosives are – ANAL, ANFO, black powder, dynamite, urea nitrate, TNT etc.
2. What is the property of low explosives?
a) Reaction rates are high
b) Requires an initiator
c) Reaction rates are slow
d) Yield at low flame temperature
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Explanation: Low explosives are that material whose reaction rates are relatively slow and controllable. Examples: various propellants such as colloidal cellulose nitrate, black powder, charcoal etc.
3. In which categories explosives are used in highest amount?
a) Coal mining
b) Metal mining
c) Non-metallic mining
d) Construction
View Answer
Explanation: Industrial usage of high explosives in categories such as coal mining-30%, metal mining- 20%, non-metallic mining and quarrying -23%, construction and road building-25%.
4. In which form C4 explosives are appeared?
a) Colourless crystal
b) Odorless
c) Smells like motor oil
d) Dyed pink powder
View Answer
Explanation: C4 explosives are appeared in -smells like motor oil, light brown putty like substance. HMX explosives are appeared in the form of colourless crystal or odorless and dyed pink powder.
5. PETN ( Pentaerythritol tetranitrate) is highly sensitive for which factor?
a) Shock
b) Non-toxic
c) Insensitive to heat
d) Ignite and burn
View Answer
Explanation: PETN’s are highly sensitive to heat, shock and friction while C4 explosives are sensitive to non-toxic, insensitive to heat and will ignite and burn. HMX explosives are also sensitive to heat, shock and friction.
6. Which explosives are only soluble in acetone but insoluble in water?
a) PETN
b) HMX
c) ANFO
d) C4
View Answer
Explanation: Chemical iterations of HMX explosives are soluble in acetone but insoluble in water while in case of PETN those are insoluble in water, barely soluble in alcohol, ether and benzene, and soluble in acetone, methyl acetate.
7. Which explosives is known as ‘octogen’?
a) RDX
b) HMX
c) Semtex
d) Black powder
View Answer
Explanation: Alternate names of HMX explosives are – high melting explosives, cyclotetramethylenetetranitramine, octogen, high velocity military explosives and his/her majesty’s explosives.
8. Which explosives are used for primarily mines and demolition explosives?
a) TNT
b) Urea nitrate
c) HMTD
d) TATP
View Answer
Explanation: Uses of TNT (Trinitrotoluene) are -primarily mines and demolition explosives, also used in booster explosives and missile and rocket propellants while urea nitrate is used for manufacture of agricultural fertilizer.
9. Which explosive corrodes most metal?
a) Smokeless powder
b) Black powder
c) HMTD
d) Dynamite
View Answer
Explanation: HMTD ( hexamethylene-triperoxide diamine) is an improvised explosives which corrodes most of metal because of the property of extremely sensitive heat, shock and friction also.
10. Which explosive is known as “magic marble of pardubice”?
a) ANFO
b) TNT
c) RDX
d) Semtex
View Answer
Explanation: Semtex is an odorless red explosives which is insensitive to heat, shock and friction. It can be used as secondary blasting. Semtex is generally known as “magic marble pardubice”.
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