Which of the following is a danger from lead-tin solder?
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.
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 Application
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.
Key Concepts
Why Other Options 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.
题目解析
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.
考试技巧
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.
记忆口诀
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.
实际应用示例
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.
错误选项分析
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.
知识点
Lead-tin solder, Lead contamination, Food contamination, Hand washing
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.