OPSC OAS 2019 PrelimsScience & TechnologyQuestion 16
Solved previous year question from the OPSC OAS/OCS 2019 Preliminary Examination (General Studies), with the official answer key and a detailed explanation.
Question
Fuse wire used in electric instruments are made up of:
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Answer & Explanation
Correct answer: (C) Alloy of lead and tin
- Fuse wires are safety devices designed to protect electrical circuits from excessive current. They work by melting and breaking the circuit when current exceeds a safe level.
Why lead-tin alloy is used
The alloy of lead and tin has the following properties that make it ideal for fuse wires:
- Low melting point – The alloy melts quickly when excess current flows, breaking the circuit before damage occurs
- High resistance – Generates heat when current passes through it
- Predictable melting behavior – Provides reliable protection
- Cost-effective – Economical for manufacturing
Common composition: Fuse wires typically contain approximately 63% tin and 37% lead, though compositions may vary.
