NDA2015General AbilityGeneral ScienceActual
The following 8 (Eight) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Statement I : The granules of modern gunpowder (also called black powder) are typically coated with Graphite. Statement II : Graphite prevents the build-up of electrostatic charge.
Options
- ABoth the statements are individually true and Statement II is the correct explanation of Statement I
- BBoth the statements are individually true but Statement II is not the correct explanation of Statement I
- CStatement I is true but Statement II is false
- DStatement I is true but Statement II is true
Correct answer
A. Both the statements are individually true and Statement II is the correct explanation of Statement I
Step-by-step solution
Commercial black powder looks black because the little lumps of the stuff are coated with graphite. In the manufacturing process, the powder's mixed with water or some other liquid binder, pressed into cakes and dried, then crushed and screened into powders of various particle size, larger particles producing a slower burn. The graphite serves no chemical purpose, but it lubricates the particles, and also makes the bulk powder electrically conductive enough that it is unlikely to initiate proceedings unexpectedly b