1. A mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?
(a) Hydrogen and Oxygen
(b) Oxygen and Acetylene
(c) Methane and Air
(d) Carbon dioxide and Methane
[I.A.S. (Pre) 2008, Uttarakhand P.C.S. (Pre) 2007]
Ans. (c) Methane and Air
- In mines, a mixture of methane and air is usually the cause of an explosion.
- Carbon monoxide, carbon dioxide, methane, oxygen, nitrogen and hydrogen gases are found there and when mixed with air, they can become explosive.
- The presence of methane in air needs to be at least 5.15% for it to be explosive.
- For carbon monoxide, the air needs to have between 12.5-74% for it to be dangerous.
- A mix of carbon and hydrogen in
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2. Which one of the following is not an explosive :
(a) Trinitrotoluene (TNT)
(b) Trinitroglycerine
(c) Cyclotrimethylene Trinitramine (RDX)
(d) Nitrochloroform
[U.P.P.C.S. (Pre) 2014, U.P.P.C.S. (Pre) 2003, U.P.U.D.A./L.D.A. (Pre) 2002, U.P.P.C.S. (Pre) 2001]
Ans. (d) Nitrochloroform
- Nitrochloroform, also called chloropicrin, is a chemical used for many purposes such as killing bacteria, fungi, plants, and insects.
- It can also be used as a tear gas.
- During WWI, it was made for use as a poisonous gas. Another use for it is in explosives.
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3. Which one of the following is not an explosive?
(a) Nitrochloroform
(b) TNG
(c) TNT
(d) Potassium Chlorate
[U.P.P.C.S. (Mains) 2015]
Ans. (a) Nitrochloroform
- Nitrochloroform, also known as chloropicrin, is a chemical compound used for a variety of purposes.
- It can be used to kill microbes, fungi, plants, and insects.
- It was also used as a type of poison gas during World War I.
- It can also be used as an explosive.
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4. ‘Nobel oil’ is the name of which one of the following explosives?
(a) TNG
(b) TNP
(c) TNA
(d) TNT
[U.P. Lower Sub. (Pre) 2015]
Ans. (a) TNG
- Trinitroglycerin (TNG), which is sometimes called Nobel oil, is a liquid that explodes.
- It is made of an organic chemical called nitrate.
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5. RDX was invented by
(a) Alfred Nobel
(b) Soddy
(c) Bergillins
(d) Henning
[U.P. PCS (Mains) 2016]
Ans. (d) Henning
- RDX, also known as cyclonite, is a type of explosive.
- It was invented by George Friedrich Henning of Germany and patented in 1898, but wasn’t used until World War II when most countries involved in the war started using it.
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6. Which one of the following statements is correct?
(a) DDT is an antibacterial compound.
(b) TNT is an insecticide.
(c) RDX is an explosive.
(d) LSD is an antiviral compound.
[U.P.P.C.S. (Pre) 1996]
Ans. (c) RDX is an explosive
- RDX is an explosive solid with the chemical formula of C3H6N6O6 and is also known as Cyclonite, hexogen, and T-4.
- It is more powerful than TNT and has a velocity of 8750 m/sec.
- It was heavily used in World War II due to its high explosive properties.
- RDX is a colorless solid and is created by combining nitric acid and hexamine.
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7. Which one of the following is another name of RDX?
(a) Cyanohydrin
(b) Dextran
(c) Cyclohexane
(d) Cyclonite
[I.A.S. (Pre) 2007, U.P.P.C.S. (Mains) 2007]
Ans. (d) Cyclonite
- RDX is an explosive solid, also known as Cyclonite, hexogen, and T-4.
- Its chemical formula is C3H6N6O6 and it has a velocity of 8750 m/sec, making it more powerful than TNT.
- It is a colorless solid that is made by mixing nitric acid and hexamine.
- During the Second World War, it was often used due to its high explosive properties.
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8. Which one of the following is used as an explosive?
(a) Phosphorus Trichloride
(b) Mercuric Oxide
(c) Graphite
(d) Nitroglycerine
[I.A.S. (Pre) 2009]
Ans. (d) Nitroglycerine
- Nitroglycerine is an explosive that is thick, colorless, and oily.
- It is also called glyceryl trinitrate (GTN) or 1,2,3- tr
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9. Which one of the following explosives does not contain nitroglycerine as an essential constituent?
(a) Cordite
(b) Blasting Gelatine
(c) Dynamite
(d) Amatol
[U.P.P.C.S. (Mains) 2010]
Ans. (d) Amatol
- Cordite, blasting gelatin, and dynamite all contain nitroglycerin as part of them.
- Amatol is a very explosive substance made up of ammonium nitrate and TNT (Trinitrotoluene) put together in different amounts
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10. Which one of the following is used in the production of explosives?
(a) Glycerol
(b) Methanol
(c) Urea
(d) Oxalic acid
[U.P. R.O./A.R.O. (Pre) 2016]
Ans. (a) Glycerol
- Glycerol is an organic compound that, when reacted with strong acid (conc. HNO3 and conc. H2 SO4), creates nitroglycerin.
- This is a heavy, clear, oily, and highly explosive liquid also known as trinitroglycerin (TNG), glyceryl trinitrate (GTN), or Nobel
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11. The chemical used in the manufacturing of dynamite is
(a) Glycerol
(b) Glycerol triacetate
(c) Glycerol trinitrate
(d) Glycerol triiodate
[Jharkhand P.C.S. (Pre) 2016]
Ans. (c) Glycerol trinitrate
- Glycerol is a type of organic compound.
- When it is combined with concentrated nitric acid and concentrated sulfuric acid, it makes nitroglycerin.
- This is a heavy, clear, oily and very explosive liquid.
- It is also called trinitroglycerin (TNG), glyceryl trinitrate (GTN), or Nobel’s oil.
- It is mainly used in explosives such as dynamite.
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