Correct option is B
Silicon carbide (SiC) is a very hard and sharp abrasive material widely used in honing, grinding, and finishing processes. Its hardness is second only to diamond among commonly used abrasives, which makes it highly effective for machining hard and brittle materials such as hardened steel and cast iron. During honing, silicon carbide abrasives remove small amounts of material efficiently while producing a smooth surface finish and accurate dimensions.
The abrasive particles of silicon carbide are friable, meaning they fracture easily to expose new sharp edges. This property ensures continuous cutting action, especially when working on hard materials where tool wear is a concern. That is why it is particularly suitable for precision finishing operations like cylinder bores and bearing surfaces.
Other options are incorrect because softer materials like aluminium usually require softer abrasives (like aluminium oxide) to prevent embedding of abrasive particles. Materials like rubber, plastic, and wood do not require such hard abrasives and may even get damaged.
