Multiple choice questions

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Try the multiple choice questions below to test your knowledge of Chapter 1. Once you have completed the test, click on 'Submit Answers for Grading' to get your results.

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This activity contains 10 questions.

An explosive that normally detonates is known as:

a high explosive.a low explosive.a secondary explosive.a primary explosive.

Which one of the following is a definition of a deflagration?

A small explosion used to set off a main charge of explosive.A type of chemical explosion in which the speed at which the reaction front moves through the explosive is less than the speed of sound in that material.The name given to any explosion that occurs in a condensed explosive.A type of chemical explosion in which the speed at which the reaction front moves through the explosive is greater than the speed of sound in that material.

Which one of the following is a definition of a detonation?

A type of chemical explosion in which the speed at which the reaction front moves through the explosive is greater than the speed of sound in that material.A type of chemical explosion in which the speed at which the reaction front moves through the explosive is less than the speed of sound in that material.A small explosion used to set off a main charge of explosive.The name given to any explosion that occurs in a condensed explosive.

A secondary explosive is, by definition:

the main charge of an explosive device that is set off by a small quantity of explosive that is relatively easier to initiate than itself.a low explosive.a deflagrating explosive.a dispersed explosive.

Detonations in dispersed explosives are rare, when they do occur:

secondary explosives are always involved.the explosion centre and the region of maximum damage do coincide.shattering effects are not seen.the explosion centre and the region of maximum damage do not coincide.

Using the equation given below, calculate the approximate diameter of the crater that would be expected to be produced by a bomb containing 210 kg of explosive.

where W is the weight of the charge in kilograms and d is the diameter of the crater in meters.

Is the answer?

10 m15 m5 m20 m

Read the following statements and then decide which of the answers is correct.

(i) Bulk samples of explosive have the potential to contaminate items that are suspected of containing trace quantities of explosives.

(ii) With careful handling to avoid cross contamination, it is considered to be best practise to analyse items for trace levels of explosives in the same room in which bulk samples of explosives are analysed, as this minimises the amount of equipment that must be used.

Statement (i) is true but statement (ii) is false.Both statement (i) and statement (ii) are false.Statement (i) is false but statement (ii) is true.Both statement (i) and statement (ii) are true.

Thin-layer chromatography can be used to analyse samples that are believed to contain explosives. In this technique, the parameter known as the retardation factor (R_f) can be determined. Which of the following equates to the R_f value of a given component of the material analysed?

Distance travelled by the component divided by the furthest distance travelled by the solvent from the origin.Distance travelled by the component subtracted from the furthest distance travelled by the solvent from the origin.Distance travelled by the component added to the furthest distance travelled by the solvent from the origin.Distance travelled by the component multiplied by the furthest distance travelled by the solvent from the origin.

Read the following statements and then decide which of the answers is correct.

(i) Analytical data that show the presence of traces of explosive materials on someone’s hands is not proof that a crime has been committed.

(ii) Traces of explosives can be transferred to someone’s hands by shaking hands with someone who has recently handled explosives.

Statement (i) is false but statement (ii) is true.Both statement (i) and statement (ii) are false.Statement (i) is true but statement (ii) is false.Both statement (i) and statement (ii) are true.

Read the following statements and then decide which of the answers is correct.

(i) The handling of bulk samples of explosives has to be carried out with great care, not least because they may explode.

(ii) The ease with which nitroglycerine can be caused to explode means that it cannot be analysed by either GC or HPLC.

Both statement (i) and statement (ii) are false.Statement (i) is false but statement (ii) is true.Statement (i) is true but statement (ii) is false.Both statement (i) and statement (ii) are true.

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