Overview: Notes on Alloy And Their Composition
General Science Chemistry portion me Alloys (Mishradhatu) and their Compositional Percentages se direct questions puche jaate hain. RRB NTPC, RRB JE, SSC CGL, aur CHSL exams me Brass, Bronze, German Silver, Stainless Steel, aur Amalgam jaise alloys ke elemental components par question fixed hota hai.
Important Coverage in this PDF Study Set
- Copper Alloys: Brass (Pital), Bronze (Kansa), aur Gunmetal ki exact percentage breakdown.
- Iron & Steel Alloys: Stainless Steel, Alnico, Invar, aur Nickel Steel ke metallurgical uses.
- Special Alloys & Amalgam: Mercury alloys (Amalgam), Bell Metal, aur Nichrome wires ki properties.
- Solder & Bearing Metals: Low melting point alloys jaise Solder Metal (Tin + Lead).
PDF Material Details
| Attribute | Specification Details |
|---|---|
| Topic Name | Notes on Alloy And Their Composition |
| Category | General Science — Metallurgy & Applied Chemistry |
| Language | English / Hindi Mix (Aspirant Friendly) |
| Target Exams | RRB NTPC, SSC CGL, SSC CHSL, RRB JE, State PSCs |
| Core Focus | Major Alloys List, Elemental Ratios, Industrial Uses & Short Tricks |
Practice MCQs on Alloys & Compositions
Apni memory aur preparation depth test karne ke liye niche diye gaye 12 high-yield MCQs solve karein:
Q1. What are the main constituent metals of Brass (Pital)?
Check Answer
Answer: Copper (Cu ~ 70%) and Zinc (Zn ~ 30%).
Q2. Bronze is an alloy composed primarily of which two elements?
Check Answer
Answer: Copper (Cu ~ 88%) and Tin (Sn ~ 12%).
Q3. Which metal is NOT present in German Silver despite its name?
Check Answer
Answer: Silver (Ag – 0%). German Silver consists of Copper, Zinc, and Nickel.
Q4. Solder wire used in electrical circuit repair is an alloy of:
Check Answer
Answer: Lead (Pb ~ 50%) and Tin (Sn ~ 50%). It has a very low melting point.
Q5. Stainless steel resists rusting due to the presence of which element?
Check Answer
Answer: Chromium (Cr). It forms a passive layer of chromium oxide that prevents corrosion.
Q6. What metal must be present for an alloy to be classified as an Amalgam?
Check Answer
Answer: Mercury (Hg).
Q7. Nichrome wire, commonly used as a heating element in electric irons, contains:
Check Answer
Answer: Nickel (Ni), Chromium (Cr), Iron (Fe), and Manganese (Mn).
Q8. Duralumin is a light and strong alloy widely used in aircraft construction. It consists mainly of:
Check Answer
Answer: Aluminium (Al ~ 95%), Copper (Cu), Manganese (Mn), and Magnesium (Mg).
Q9. Which alloy is used for making permanent magnets due to its magnetic properties?
Check Answer
Answer: Alnico (Aluminium + Nickel + Cobalt + Iron).
Q10. Bell metal, used to cast bells, consists of Copper and Tin in what ratio?
Check Answer
Answer: Approximately 80% Copper and 20% Tin.
Q11. Invar alloy has a near-zero thermal expansion coefficient. It is made of:
Check Answer
Answer: Iron (Fe ~ 64%) and Nickel (Ni ~ 36%).
Q12. What is 24 Karat gold?
Check Answer
Answer: Pure Gold (100% Gold). 22 Karat gold contains 22 parts gold and 2 parts copper or silver alloyed for hardness.
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FAQs: Notes on Alloy And Their Composition
Q1: Why are alloys harder than pure metals?
Ans: Alloys contain atoms of different sizes. This disrupts the regular crystalline lattice structure of the base metal, making it harder for layers of atoms to slide over one another.
Q2: What is an Amalgam and why is Iron not stored in Mercury?
Ans: An Amalgam is an alloy of mercury with another metal. Iron does not form an amalgam with mercury, which is why mercury can be safely transported in iron containers.
Q3: What is the difference between Brass and Bronze?
Ans: Brass is an alloy of Copper and Zinc, whereas Bronze is an alloy of Copper and Tin.
Q4: How can I download alloy composition PDFs for free on SarkariExamPDF?
Ans: Scroll to the download box on this page, click "Click to Get Download Link", wait for 10 seconds, and your direct Google Drive download button will appear.
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