The layers of metal ions are able to slide over and past each other
0%
The ions of a metal are able to break free of each other
0%
They are ionically bonded
Q.2.
Tungsten is a transition metal that is used for making the filaments of some electric light bulbs. What is the most likely reason for this?
0%
Tungsten has a high density
0%
Tungsten has a high boiling point
100%
Tungsten has a high melting point
0%
Tungsten is very cheap
Q.3.
Aluminuim is not as good a conductor of electricity as copper so why is it used for making the electrical cables for the National Grid?
0%
It is easier than copper to make it into wires
0%
It doesn't expand or contract
0%
It is silver colored so birds and pilots can see and avoid the cables
100%
The density of aluminum is less than that of copper
Q.4.
Why do metals conduct electricity?
100%
They have ionic bonds
0%
They have covalent bonds
0%
They have free electrons
0%
The layers of ions in a metal
Q.5.
Which of the following metals would be suitable for making a hammer?
0%
Steel
0%
Cast iron
0%
Copper
100%
Titanium
Q.6.
Why are the metals magnesium and titanium used to make alloys for aircraft frames?
0%
They are light metals
0%
They are heavy metals
100%
They are transition metals
0%
They are silver colored metals
Q.7.
Steel corrodes but it is still the best metal for making car bodies. Why is this?
0%
Steel is shiny and makes cars look good
0%
Steel conducts electricity
0%
Steel conducts heat well
100%
Steel is strong and malleable
Q.8.
House electrical systems require a good earthing system to make them safe. The earthing system carries electricity safely into the ground and causes the safety devices in the house to 'trip', preventing electric shocks. Electricians sometimes fix the earth wires of a domestic electrical system to copper pipes used for the plumbing. Why is this?
0%
The water in the pipe conducts electricity to earth
100%
Copper is a good conductor of electricity
0%
The pipes will stay cool in the event of an electrical emergency
0%
It is an easy thing to do and saves them the time and trouble of putting a proper system in place
Q.9.
Which of the following is a physical property of titanium?
100%
Low density
0%
Corrosion resistant
0%
Conducts electricity
0%
Very strong
Q.10.
Many people who ride mountain bikes buy parts made from titanium alloys. Which of the following is a practical reason for making this choice?
100%
Titanium alloys are lightweight
0%
Titanium alloys have a high melting point
0%
Titanium alloys are durable
0%
Titanium alloys are resistant to metal fatigue
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