Question 25

The Correct Answer is B. ### Explanation for Correct Answer (B) The premise states that with the exception of drills measured as $0.25$ inch, no two drills from differing drill sets are the exact same size. The question asks to identify the drill that is the same size as the $1/4$ inch drill ($0.25$ inch) but belongs to a different drill set. Drill bits are typically categorized into four main sets based on how their diameter is designated: 1. **Fractional** (e.g., $1/4$ inch, $5/16$ inch) 2. **Decimal/Metric** (typically designated by the decimal size or metric size) 3. **Letter** (designated A through Z) 4. **Number** (designated No. 1 through No. 80) The size of the **"E" drill** (which belongs to the Letter set) is standardized as **$0.2500$ inches** (or $1/4$ inch). Since the $1/4$ inch drill belongs to the Fractional set and the "E" drill belongs to the Letter set, they represent two drills from *differing drill sets* that are the *exact same size* ($0.2500$ inches), fitting the specific exception described in the question. ### Explanation for Incorrect Options **A) "A" drill:** The "A" drill is $0.2340$ inches in diameter. This size is clearly smaller than $0.25$ inches, so it is not the correct match. **C) No.1 drill:** The No. 1 drill is $0.2280$ inches in diameter. This size is smaller than $0.25$ inches, so it is not the correct match. **D) No.80 drill:** The No. 80 drill is the smallest standard drill in the numbered set, measuring $0.0135$ inches in diameter. This size is significantly smaller than $0.25$ inches, so it is not the correct match.