1- Brasses are alloys which normally contain copper with 5-40% zinc. Which one o
ID: 1712875 • Letter: 1
Question
1-
Brasses are alloys which normally contain copper with 5-40% zinc. Which one of the following does not happen as you increase the amount of zinc in brass?
Strength decreases
Density decreases
Elastic modulus decreases
Electrical conductivity decreases
Thermal conductivity decreases
Melting point decreases
2-
Silicon Carbide (SiC), a hard material that is most commonly used as an abrasive, has what type of bonding?
Van der Waals
Mostly ionic
Metallic
Covalent and Van der Waals
Mostly covalent
3-
Which of the following alloys contains the highest fraction of copper?
Naval brass
cartridge brass
gilding metal
muntz metal
5.nickel-silver
4-
which of the following is the correct order of increasing metal density?
Mg, Al, Ti, Zn, Cu, Pb, W
Mg, W, Al, Cu, Fe, Pb
W, Mg, Al, Zn, Ti, Cu, Pb
Mg, Al, Cu, Zn, Ti, W, Pb
Mg, Al, Cu, W, Ti, Pb, Fe
Zn, Mg, Ti, Al, Cu, W, Pb
Mg, Al, Ti, Cu, Zn, W, Pb
Ti, Mg, Al, Zn, Cu, Pb, W
Strength decreases
Density decreases
Elastic modulus decreases
Electrical conductivity decreases
Thermal conductivity decreases
Melting point decreases
2-
Silicon Carbide (SiC), a hard material that is most commonly used as an abrasive, has what type of bonding?
Van der Waals
Mostly ionic
Metallic
Covalent and Van der Waals
Mostly covalent
3-
Which of the following alloys contains the highest fraction of copper?
1.Naval brass
2.cartridge brass
3.gilding metal
4.muntz metal
5.nickel-silver
4-
which of the following is the correct order of increasing metal density?
Mg, Al, Ti, Zn, Cu, Pb, W
Mg, W, Al, Cu, Fe, Pb
W, Mg, Al, Zn, Ti, Cu, Pb
Mg, Al, Cu, Zn, Ti, W, Pb
Mg, Al, Cu, W, Ti, Pb, Fe
Zn, Mg, Ti, Al, Cu, W, Pb
Mg, Al, Ti, Cu, Zn, W, Pb
Ti, Mg, Al, Zn, Cu, Pb, W
Explanation / Answer
1. As we increase the percentage of zinc in brass following changes happen:
strength increases
density decreases
elastic modulus decreases
thermal and electrical conductivity increases
melting point decreases
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