Chemistry: Inorganic Chemistry: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Chemistry: Inorganic Chemistry (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2006Science and Technology · Chemistry: Inorganic Chemistry
Q1. Which are the materials generally employed as solder in soldering operations in electronics?
Explanation
Option (b) is correct: In soldering operations, especially in electronics, the most common solder alloys are made from lead (Pb) and tin (Sn). This combination is used because it has a low melting point, which makes it ideal for joining electronic components without damaging sensitive parts. The typical composition of the solder is 60% tin and 40% lead or 63% tin and 37% lead, though lead-free soldering is becoming more common due to environmental concerns, often comprising tin with small amounts of copper, silver, or other metals. Options (a), (c) and (d) are incorrect:
Iron and tin are not commonly used together in soldering; while iron is typically used as a base metal in some electrical circuit components, it is not a part of the solder itself. Aluminium and lead are not commonly used as soldering materials either. Aluminium is difficult to solder, and its oxide layer makes it less suitable for standard soldering techniques.
Answer key for these questions
Q
UPSC year
Correct answer
1
2006
(b) Lead and tin
Frequently asked questions
How many previous year UPSC questions are there on Chemistry: Inorganic Chemistry?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Chemistry: Inorganic Chemistry (Science and Technology), asked from 1996 to 2008. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Chemistry: Inorganic Chemistry?
Questions on Chemistry: Inorganic Chemistry (Science and Technology) are available for 11 years, from 1996 to 2008. Use the Year filter to practise a single paper.
