Deep Dive: G0B10
The correct answer is A: Lead can contaminate food if hands are not washed carefully after handling the solder. A danger from lead-tin solder is that lead can contaminate food if hands are not washed carefully after handling the solder. Lead is toxic and can be ingested if hands aren't washed. For amateur radio operators, this is important safety. Understanding this helps prevent lead poisoning.
Why Other Answers Are Wrong
Option B: Incorrect. High voltages don't cause lead-tin solder to disintegrate - solder doesn't disintegrate from voltage. Disintegration isn't the danger. Option C: Incorrect. Tin cold flow doesn't cause shorts - cold flow is a mechanical property, not an electrical danger. Cold flow isn't the danger. Option D: Incorrect. RF energy doesn't convert lead to poisonous gas - lead is already toxic, but RF doesn't convert it. Gas conversion isn't the danger.
Exam Tip
Lead-tin solder danger = lead can contaminate food if hands not washed. Think 'L'ead 'S'older = 'L'ead 'S'afety (wash hands). Lead is toxic and can be ingested if hands aren't washed after handling. Not disintegration, not cold flow, not gas conversion - just food contamination.
Memory Aid
Lead-tin solder danger = lead can contaminate food if hands not washed. Think 'L'ead 'S'older = 'W'ash 'H'ands. Lead is toxic and can be ingested if hands aren't washed after handling. Important safety precaution.
Real-World Example
Lead-tin solder: After handling solder, if you don't wash your hands carefully, lead can contaminate food when you eat. Lead is toxic and can cause lead poisoning if ingested. This is why you should always wash hands thoroughly after handling solder. Lead contamination of food is the danger - this is why hand washing is important.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G0B
Reference: 2023-2027 Question Pool · G0 - Electrical and RF Safety
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G0B topic.