Questions on Alloys
20 Multiple-Choice Questions: Alloys
Questions
1. What is an alloy?
A) A compound of two nonmetals
B) A pure element with enhanced properties
C) A mixture of metals or a metal with nonmetals
D) A radioactive metal
E) A natural mineral
2. Which of the following is a substitutional alloy?
A) Brass
B) Steel
C) Pewter
D) Bronze
E) Amalgam
3. What are the main components of bronze?
A) Copper and zinc
B) Iron and carbon
C) Copper and tin
D) Aluminum and magnesium
E) Lead and antimony
4. Steel is an alloy primarily made from:
A) Iron and tin
B) Copper and tin
C) Iron and carbon
D) Lead and zinc
E) Aluminum and iron
5. What is the purpose of adding carbon to iron in steel?
A) To make it less reactive
B) To improve corrosion resistance
C) To increase hardness and strength
D) To reduce melting point
E) To improve conductivity
6. What type of alloy is stainless steel?
A) Interstitial
B) Substitutional
C) Amalgam
D) Ionic
E) Elemental
7. Which of the following is a property typically improved in alloys compared to pure metals?
A) Electrical conductivity
B) Reactivity
C) Hardness
D) Radioactivity
E) Isotopic purity
8. Brass is made from:
A) Copper and tin
B) Copper and zinc
C) Iron and carbon
D) Zinc and magnesium
E) Aluminum and silicon
9. Which of the following alloys contains mercury?
A) Amalgam
B) Solder
C) Pewter
D) Bronze
E) Duralumin
10. Which alloy is used in dental fillings?
A) Pewter
B) Brass
C) Amalgam
D) Bronze
E) Solder
11. Which alloy is commonly used in aircraft construction due to its light weight?
A) Steel
B) Brass
C) Bronze
D) Duralumin
E) Pewter
12. The process of mixing metals to form alloys usually involves:
A) Freezing them
B) Electroplating
C) Melting and mixing
D) Filtering
E) Compressing at room temperature
13. What type of alloy forms when small atoms fit into the spaces (interstices) between larger atoms?
A) Substitutional alloy
B) Interstitial alloy
C) Ionic alloy
D) Heterogeneous alloy
E) Covalent alloy
14. Which of the following is an example of an interstitial alloy?
A) Bronze
B) Brass
C) Carbon steel
D) Pewter
E) Duralumin
15. What is the primary reason alloys are more commonly used than pure metals in engineering?
A) Alloys are cheaper
B) Alloys are more radioactive
C) Alloys have better mechanical properties
D) Alloys conduct electricity better
E) Pure metals are heavier
16. Which of the following is NOT an alloy?
A) Brass
B) Bronze
C) Steel
D) Copper
E) Duralumin
17. Which of these alloys is commonly used in coins?
A) Duralumin
B) Solder
C) Brass
D) Amalgam
E) Cast iron
18. Which alloy has high resistance to corrosion and is used in kitchenware and surgical tools?
A) Pewter
B) Stainless steel
C) Brass
D) Bronze
E) Amalgam
19. What is solder commonly made from?
A) Copper and tin
B) Tin and lead
C) Zinc and aluminum
D) Nickel and chromium
E) Iron and manganese
20. What effect does alloying generally have on the melting point of a metal?
A) It always increases it
B) It always decreases it
C) It has no effect
D) It usually lowers it
E) It makes it radioactive
Answers with Extended Explanations
1. C) A mixture of metals or a metal with nonmetals
→ Alloys are mixtures, not compounds, designed to improve physical properties.
2. A) Brass
→ In brass, zinc atoms substitute some of the copper atoms (substitutional).
3. C) Copper and tin
→ Bronze is a classic alloy used since ancient times.
4. C) Iron and carbon
→ Steel is primarily composed of iron with a small percentage of carbon.
5. C) To increase hardness and strength
→ Carbon reinforces the iron lattice, enhancing mechanical properties.
6. A) Interstitial
→ Stainless steel includes small atoms (like carbon) in spaces between iron atoms.
7. C) Hardness
→ Alloys are typically harder and stronger than pure metals.
8. B) Copper and zinc
→ Brass is widely used in decorative and musical instruments.
9. A) Amalgam
→ Amalgams are mercury-based alloys, commonly with silver.
10. C) Amalgam
→ Dental amalgam is a mercury alloy used in fillings.
11. D) Duralumin
→ A lightweight, strong aluminum alloy used in aerospace.
12. C) Melting and mixing
→ This allows the atoms to mix at the atomic level.
13. B) Interstitial alloy
→ Smaller atoms fill in the spaces of a metal lattice.
14. C) Carbon steel
→ Carbon atoms sit between iron atoms.
15. C) Alloys have better mechanical properties
→ Alloys are stronger, more durable, and less reactive.
16. D) Copper
→ Copper is a pure element, not an alloy.
17. C) Brass
→ Often used in coins due to its appearance and durability.
18. B) Stainless steel
→ Highly corrosion-resistant due to chromium content.
19. B) Tin and lead
→ Solder traditionally uses this combination for low melting point.
20. D) It usually lowers it
→ Alloying disrupts the regular atomic pattern, lowering the melting point.
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