Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Explosives
1 - Question
Which one mentioned below is one of commercial explosives?
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 - Question
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
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 - Question
In which categories explosives are used in highest amount?
a) Coal mining
b) Metal mining
c) Non-metallic mining
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 - Question
In which form C4 explosives are appeared?
a) Colourless crystal
c) Smells like motor oil
d) Dyed pink powder
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 - Question
PETN ( Pentaerythritol tetranitrate) is highly sensitive for which factor?
c) Insensitive to heat
d) Ignite and burn
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 - Question
Which explosives are only soluble in acetone but insoluble in water?
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 - Question
Which explosives is known as ‘octogen’?
d) Black powder
Explanation: Alternate names of HMX explosives are – high melting explosives, cyclotetramethylenetetranitramine, octogen, high velocity military explosives and his/her majesty’s explosives.
8 - Question
Which explosives are used for primarily mines and demolition explosives?
b) Urea nitrate
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 - Question
Which explosive corrodes most metal?
a) Smokeless powder
b) Black powder
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 - Question
Which explosive is known as “magic marble of pardubice”?
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”.