Question

why should dull drill bits never be used? * a) they are too expensive b) they break easily and require more effort c) they are not shiny enough d) they can’t fit in a chuck

Explanation:

• Option A: Cost isn't a reason to avoid dull drill bits (they're not too expensive to use, and cost doesn't relate to safety/efficiency of use).
• Option B: Dull drill bits have reduced cutting ability, so they break easily and need more force/effort to use, making this correct.
• Option C: Shine has no relevance to drill bit functionality.
• Option D: Dullness doesn't affect fitting in a chuck (chuck fits based on size, not sharpness).

Answer:

B) They break easily and require more effort