Classification – Odd one out (sharp/pointed objects vs blunt tool) Three of the following are typically sharp/pointed objects; one is a blunt striking tool. Identify the odd one out.

Introduction / Context:
Physical-object classifications often contrast pointed/piercing items with blunt tools. Recognizing functional affordances (piercing vs striking) yields the answer quickly.

Given Data / Assumptions:

• Screw → pointed tip for fastening
• Needle → pointed for piercing
• Pin → pointed for fastening
• Hammer → blunt striking tool

Concept / Approach:
Group by typical function and tip shape: pointed vs blunt.

Step-by-Step Solution:
Screw → pointed.Needle → pointed.Pin → pointed.Hammer → blunt tool → odd one out.

Verification / Alternative check:
Consider usage verbs: pin/needle/screw pierce or thread; hammer strikes. The distinct action confirms the mismatch.

Why Other Options Are Wrong:

• Screw, Needle, Pin → share “sharp/pointed” affordance.
• None of these → a single blunt tool exists (Hammer).

Common Pitfalls:
Overlooking that screws are indeed pointed at the tip in most common forms.

Final Answer:
Hammer