Q1:
Which of the following is the best description of an alloy?
- A A solid solution of one or more elements within a pure metal
- B A mixture of two or more non-metals
- C A pure metal
- D The product of smelting
- E A material made by alternating layers of different materials
Q2:
A solid alloy is produced by combining small amounts of element with a metal . Why might this alloy be described as a solid solution?
- A Atoms of increase the electrical conductivity of , like solutes in a solvent.
- B Atoms of disrupt the lattice of to produce voids that can be occupied by solvents.
- C Atoms of can move freely through the lattice of , like solutes in a solvent.
- D Atoms of disrupt the lattice of to produce a highly disordered structure resembling a solution.
- E Atoms of randomly replace atoms in the lattice of , like solutes in a solvent.
Q3:
Fill in the blank: Brass is an alloy of copper and .
- A nickel
- B tin
- C iron
- D lead
- E zinc
Q4:
Match the type of steel with the key property that makes that type of steel fit for purpose.
| Types of Steel | A. High-carbon steel | B. Low-carbon steel | C. Stainless steel |
|---|---|---|---|
| Key Property | 1. Very hard but brittle | 2. Resistant to corrosion | 3. Hard but easily shaped |
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A
A: 2
B: 3
C: 1 -
B
A: 2
B: 1
C: 3 -
C
A: 3
B: 2
C: 1 -
D
A: 1
B: 2
C: 3 -
E
A: 1
B: 3
C: 2
Q5:
The following figure shows how the color of a gold alloy depends on its composition.
Which of the following gold alloy blocks is likely to be the most expensive? You can assume they are all of the same mass.
- A The pale greenish-yellow block
- B The yellow block
- C The yellowish block
- D The white block
- E The copper-red block
Q6:
Stents are put into constricted blood vessels to reduce the effects of some chronic cardiovascular diseases. It is desirable to make stents from highly flexible alloys that can return to one shape after being deformed. The alloys should also be resistant to most forms of corrosion. Which of the following alloys is the ideal choice for making stents?
- A Bronze
- B Cupronickel
- C Nitinol
- D Brass
- E Cast iron
Q7:
Fill in the blank: A mixture of metals is known as .
- A a compound
- B a composite
- C a molecule
- D an alloy
- E a polymer
Q8:
Which of the following alloys does not contain copper?
- Steel
- Brass
- Duralumin
- Solder
- Bronze
- A Steel
- B Bronze
- C Brass
- D Duralumin
- E Solder
Q9:
Trumpets are usually made of metals that are malleable and lustrous. They also tend to be made of metals that have good acoustic properties. Which of the following alloys is most suitable for making trumpets?
- A Bronze
- B Brass
- C Nitinol
- D Steel
- E Cupronickel
Q10:
Steel, a solid solution consisting of carbon atoms seated in the holes of an iron atom structure, is an example of .
- A an alkali metal
- B a pure metal
- C a substitutional alloy
- D an interstitial alloy
Q11:
Medical engineers are making some metal brace wire. They want to use a metal alloy that easily returns to its original shape after being deformed. Which of the following alloys should they use?
- A Nitinol
- B Cast iron
- C Brass
- D Cupronickel
- E Bronze
Q12:
The following table shows the atomic numbers of four elements (A, B, C, D).
| Element | A | B | C | D |
|---|---|---|---|---|
| Atomic Number | 6 | 13 | 26 | 29 |
Which of the following pairs has the ability to make two types of alloys when mixed together?
- A B and D
- B A and C
- C C and D
- D A and B
Q13:
The diagram shows a small sample of an alloy comprised of two different metals.
Which of the following contribute to making this alloy harder than either of the two metals on their own?
- The atoms are of different sizes.
- Molecules are formed between the two atoms.
- The atoms of metal B distort the layers of metal A.
- Additional defects are created.
- Additional covalent bonds exist between the different atoms.
- A 1, 3, and 4
- B 2 and 5
- C 4 and 5
- D 1 and 3
- E 2, 3, and 4
Q14:
The following table shows the atomic numbers of four elements: A, B, C, and D.
| Element | A | B | C | D |
|---|---|---|---|---|
| Atomic Number | 13 | 20 | 26 | 28 |
All of the following pairs cannot make a substitutional alloy when mixed together except .
- A C and D
- B B and D
- C A and C
- D A and D
Q15:
Aluminum may be alloyed with a wide variety of metals, including copper, magnesium, lithium, and manganese. In a space shuttle, fuel consumption was minimized by the use of aluminum alloys of minimal density. Using the element symbols, arrange the alloying metals listed in order of increasing suitability for this application.
- A , , ,
- B , , ,
- C , , ,
- D , , ,
- E , , ,
Q16:
Bronze is an alloy of copper and .
- A lead
- B zinc
- C tin
- D iron
- E nickel
Q17:
Jewelry is often produced from alloys of gold with copper and nickel. Which of the following properties is not improved by alloying gold with these metals for jewelry making?
- A Color
- B Cost
- C Corrosion resistance
- D Hardness
- E Strength
Q18:
Alloys of a particular metal display lower malleability. Which of the following properties is also likely to be lower in these alloys?
- A Melting point
- B Strength
- C Density
- D Hardness
- E Ductility
Q19:
Alloys of copper include brass, bronze, and cupronickel. Which two of the following properties typically increase in the production of a copper alloy?
- Electrical conductivity
- Melting point
- Strength
- Hardness
- Malleability
- A I and III
- B I and II
- C III and IV
- D IV and V
- E II and V
Q20:
Drink cans must be manufactured, stored, and transported in very large quantities. Why is a manganese alloy of aluminum more suitable than aluminum for the construction of drink cans?
- A Higher malleability
- B Lower cost
- C Higher strength
- D Higher corrosion resistance
- E Lower ductility
Q21:
Which of the following is not a reason why brass is used to make the pins on some electrical plugs rather than copper even though copper is a better conductor?
- A Brass expands as it solidifies.
- B Brass is resistant to corrosion.
- C Brass is more resistant to wear.
- D Brass is stronger than copper.
- E Brass is harder than copper.
Q22:
Illustrated in the diagram is the use of an alloy as a safety plug to avoid dangerous pressurization of a steam boiler. When submerged in water below its boiling point, the alloy remains solid. However, falling of the water level exposes the alloy to high-temperature steam, causing the plug to melt and the steam to be released.
Metals with low melting points, known as fusible alloys, can be made by alloying nontoxic metals such as sodium, bismuth, and indium with other elements. The melting points and main components of five fusible alloys are listed in the table.
| Alloy | Bulk Metal | Alloying Metal | Melting Point () |
|---|---|---|---|
| a | 103 | ||
| b | 95 | ||
| c | 125 | ||
| d | 125 | ||
| e | 72 |
A boiler is used to boil water for bathing. Which of the alloys in the table is most suitable for use as a safety plug in this boiler?
- A e
- B d
- C b
- D c
- E a
Q23:
Many alloys have disrupted layers that cannot slide over one another. What is the greatest change in the properties of most alloys as a result of these disrupted layers?
- A They become harder.
- B They have lower melting points.
- C They conduct electricity more efficiently.
- D They become more sonorous.
- E They become shinier.
Q24:
Some alloys can be classed as a substitutional solid solution. The following figures use a green color to represent one metal type. They use an orange color to represent a different metal type. Which figure is the most accurate representation of a substitutional solid solution?
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A
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B
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C
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D
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E
Q25:
The following figures use a gray color for carbon atoms. They use a reddish-brown color for iron atoms. Which figure is the most accurate representation of the steel alloy?
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A
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B
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C
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D
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E
