UPSSSC PET 2021 (24 Aug Shift 1)
The percentage of pure gold in 18-carat gold is
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Answer: Option B — 75%
Detailed Solution
Pure gold is 24 carat, so 18-carat gold is 18 parts gold out of 24: pure gold, the rest being other metals such as copper or silver.
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Metals, Non-metals & Metallurgy — UPSSSC PET Preparation
This question tests your understanding of Metals, Non-metals & Metallurgy, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
This topic covers the properties of metals and non-metals, the reactivity series, ores and minerals of common metals, metallurgy (concentration, roasting, calcination and refining), alloys and their compositions, and the corrosion of metals. Common questions ask about the ore of a metal (bauxite for aluminium and haematite for iron), the composition of alloys (brass is copper and zinc, and bronze is copper and tin), the best conductor of electricity (silver), and the most abundant metal in the Earth's crust (aluminium). Galvanisation coats iron with zinc to prevent rusting. Practise the metals, non-metals and metallurgy questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.