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NDA Metals, Alloys and Corrosion questions with solutions

Metals, alloys, reactivity, metallurgy and corrosion. 20 questions from our 2016–2025 NDA pattern papers, from the Class 10 Science syllabus. Each has the answer and a full solution.

NDA 2025

Rusting of iron requires the presence ofNDA 2025 GAT · easy
The most abundant metal in the Earth's crust isNDA 2025 GAT · easy

NDA 2024

Metals is a liquid at room temperature (about 25 °C)?NDA 2024 GAT · easy

NDA 2023

Alloys are generally harder than the pure metals from which they are made. 2. Brass is an alloy of copper and tin.NDA 2023 GAT · medium
The Khetri mines in Rajasthan are known for which mineral?NDA 2023 GAT · medium

NDA 2022

The Jharia coalfield, one of the major sources of coking coal in India, is inNDA 2022 GAT · medium

NDA 2021

NDA 2020

Metals is stored under kerosene oil in laboratories because it reacts vigorously with air and water?NDA 2020 GAT · easy
In the reaction Fe + CuSO4 -> FeSO4 + Cu, the species that gets reduced isNDA 2020 GAT · hard

NDA 2019

Metals does not liberate hydrogen from dilute hydrochloric acid?NDA 2019 GAT · easy
Duralumin is an alloy that contains mainly aluminium. 2. Stainless steel does not contain iron.NDA 2019 GAT · medium

NDA 2018

Galvanisation is a process of coating iron with a layer ofNDA 2018 GAT · easy
Mercury is the only metal that is liquid at room temperature. 2. Bromine is the only non-metal that is liquid at room temperature.NDA 2018 GAT · medium

NDA 2017

Metals is liquid at room temperature?NDA 2017 GAT · easy
An alloy is a homogeneous mixture of a metal with other metals or non-metals. 2. Solder is an alloy of lead and tin.NDA 2017 GAT · medium
Metals is the most reactive?NDA 2017 GAT · easy

NDA 2016

Iron articles are galvanised to prevent rusting by coating them with a layer ofNDA 2016 GAT · medium
The principal ore of aluminium isNDA 2016 GAT · easy
Alloys does not contain copper?NDA 2016 GAT · hard

Other General Knowledge topics

Current Affairs 37 Indian Economy 36 Constitution and Fundamental Rights 46 Parliament, Executive and Judiciary 23 Ancient India 36 Medieval India 28 Freedom Struggle 50 Modern India and British Rule 41 World Geography 29 Indian Geography 81 Physical Geography 31 Units and Measurements 11 Motion, Forces and Gravitation 40 Work, Energy and Power 7 Fluids and Pressure 10 Heat and Thermal Physics 8 Sound and Waves 16 Light and Optics 37 Current Electricity 20 Magnetism and Electromagnetic Induction 17 Nuclear and Modern Physics 9 Atomic Structure, Periodic Table and Bonding 31 Acids, Bases and Salts 13 Carbon and Organic Chemistry 22 Chemical Reactions 12 Mole Concept and States of Matter 13 Chemistry in Everyday Life 16 Cell Biology and Classification 18 Genetics and Heredity 13 Plant Physiology 21 Nutrition, Diseases and Health 28 Human Physiology 62 Ecology and Environment 24