Explosive Quiz Crafted by –
MD Shahbaz Alam
Forensic Science laboratory
Introduction to Explosives
Que 1. The shock and noise produced during explosion is called,
d. sonic explosion
Answer – (c) Brisance
Explanation -Brisance is the shattering capability of a high explosive, determined mainly by its detonation pressure. The term can be traced from the French verb "briser" (to break or shatter) ultimately derived from the Celtic word "brissim" (to break).
Que 2. Which is not an example of primary high explosive is
a. Lead azide
b. Mercury fulminate
Answer – (c) RDX
Explanation- Primary-high explosives are very sensitive, can be detonated easily and are generally used only in percussion and electrical detonators. Secondary-high explosives are less sensitive, require a high-energy shock wave to achieve detonation and are safer to handle. Mercury fulminate, picric acid, lead azide, nitroglycerine and iodine nitride are examples of primary explosives. Secondary-high explosives are less sensitive, require a high-energy shock wave to achieve detonation and are safer to handle. Secondary-high explosives are used in almost all elements of a ballistic chain, other than the detonator, such as in detonating cord and shaped charges. TNT, dynamite, hexogen, HMX and Torpex are examples of secondary explosives.
Que 3. Gries reagent test for Nitroglycerine produce
a. Red colour
b. Green color
c. Pink colour
d. Grey colour
Answer – (c) Pink colour
Explanation –The Griess test involves two subsequent reactions. When sulfanilamide is added, the nitrite ion reacts with it in the Griess diazotization reaction to form a diazonium salt, which then reacts with N-(1-naphthyl)ethylenediamine in an azo coupling reaction, forming a pink-red azo dye.
Que 4. Dynamite
a. Is an initiating device
b. Is a mixture containing Nitroglycerine in kieselguhr
c. Deflagrate when ignited.
d. Produce escaping gas
Answer – (b) Is a mixture containing Nitroglycerine in kieselguhr
Explanation–Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. Mixing nitroglycerine, an oily fluid, with kieselguhr, the mixture could be turned into a paste. This material could be kneaded and shaped into rods suitable for insertion into drilling holes. Today, dynamite is mainly used in the mining, quarrying, construction, and demolition industries. Dynamite is still the product of choice for trenching applications, and as a cost-effective alternative to cast boosters. Dynamite is occasionally used as an initiator or booster for AN and ANFO explosive charges.
Que 5. The oxidizing agent found in black powder is
b. Potassium nitrate.
Answer –(b) Potassium nitrate.
Explanation –In black powder, charcoal and sulphur are the fuel, and postassium nitrate (KNO3) is the oxidizing agent.
Que 6. The screen test which is presumptive identification of an explosive is
a. Thin-layer chromatography
c. Gas chromatography-mass spectrometry.
d. IR spectrophotometry
Answer – (a) Thin-layer chromatography
Explanation - TLC of drugs and explosives is used as a presumptive test, a means to provide an indication of the nature of the sample, rather than being used for positive identification of a sample. It is useful because many of the colour change presumptive tests used will only provide an indication of a certain active group in the molecule. For example with explosives the Greiss reagent (a colour change presumptive test) will normally indicate that a nitrate or nitrite group is present whereas with TLC it is possible to differentiate between different nitrate and nitrite containing compounds as they can have different Rf values and react to produce different coloured bands with the visualisation reagent.
Que 7. In recent years, dynamite has been replaced commercially by
c. Ammonium nitrate based explosive
Answer – (c) Ammonium nitrate based explosive
Explanation -ammonium nitrate-based explosives that is, water gels, emulsions, and ANFO explosives.
Que 8. The high explosive which could not be detected by Sniffer Dogs is/are
Answer –(b) HMX
Explanation -A or is a that is trained to use its to detect substances such as , , wildlife scat, currency, , and electronics such as illicit mobile phones. The sense most used by detection dogs is The smell from the detection dogs are more enhanced than the average dog.
Que 9. During custody of Baba Gurmit Ram Rahim Singh, his follower used explosive in large scale .Type of explosive used is this case was,
a. High Explosive
b. Gun Powder
c. Molotov cocktail
Answer – (c) Molotov cocktail
Explanation –A Molotov cocktail is a breakable glass bottle containing a flammable substance such as petrol (gasoline), alcohol, or a napalm-like mixture, with some motor oil added, and usually a source of ignition such as a burning cloth wick held in place by the bottle’s stopper.
Que 10. Main explosive charge in Military Hand Grenade is,
Answer – (a) TNT
Explanation – , small explosive, chemical, or gas bomb that is used at short range. The grenades most commonly used in wartime are explosive grenades, which usually consist of a core of TNT or some other high explosive encased in an iron jacket or container. Such grenades have a fuse that detonates the explosive either on impact or after a brief (usually four-second) time delay that is long enough for the grenade to be accurately thrown but is too brief for enemy soldiers to toss the grenade back once it has landed among them. A common type of explosive grenade is the fragmentation grenade, whose iron body, or case, is designed to break into small, lethal, fast-moving fragments once the TNT core explodes. Such grenades usually weigh no more than 2 pounds (0.9 kg). Explosive hand grenades are used for attacking the personnel in foxholes, trenches, bunkers, pillboxes, or other fortified positions and in street fighting.
Que 11. Which explosive is known as Borderline Explosive?
Answer – (c) PETN
Explanation –PETN (PentaerythritolTrinitrate ) is one of the most powerful explosives and is very difficult to detect. Due to its plastic nature, the explosive can easily pass metal detectors and security check points.PETN is non-metallic so it does not show up in x-ray machines. Also the bomb-sniffing dogs cannot detect it because of its low pressure molecules.
Que 12. Tetra Acetone Tetra Peroxide (TATAP) is also known as “Mother of Saitan” because
a. It is very sensitive and can explode in work place
b. It is very difficult to detect it after explosion
c. Both a and b
Answer – (c) Both a and b
Explanation - A key disadvantage is the high susceptibility of TATP to accidental detonation, causing workplace accidents and "own goals" among illegal bomb-makers, which has led to TATP being referred to as the "Mother of Satan".
Que 13. Which of the organ is commonly affected by shock waves?
Answer –(b) Lungs
Explanation – The lungs are easily affected by shock waves because they are air-containing5air-containing. Due to overpressure, the pulmonary capillaries are expanded and moved instantaneously. The overpressure also causes alveolar wall and capillary rupture.
Que 14. This is used in Molotov cocktail:
Answer –(b) Gasoline
Explanation - A Molotov cocktail is a breakable glass bottle containing a flammable substance such as petrol (gasoline), alcohol, or a napalm-like mixture, with some motor oil added, and usually a source of ignition such as a burning cloth wick held in place by the bottle's stopper.
Que 15. I.E.D. means:
a. Indian Explosive Devices
b. Internal Explosive Devices
c. Improvised Explosive Devices
d. International Explosive Devices
Answer – (c) Improvised Explosive Devices
Explanation –An improvised explosive device (IED) is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery shell, attached to a detonating mechanism. IEDs are commonly used as roadside bombs.