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HIA International — Grade 6

Unit 1: Cells and organisms

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Unit 2: States of matter, atoms and compounds

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Unit 3: The Solar System and energy

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Unit 4: Living organisms and classification

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Unit 5: Metals, non-metals, acids and alkalis

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Unit 6: Sound, the Earth and eclipses

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Unit 7: Microorganisms and food webs

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Unit 8: Chemical reactions

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Unit 9: Electricity and circuits

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Quiz

Checkpoint Grade 6 Unit 9 – 9.4 Conductors And Insulators

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Conductors And Insulators Checkpoint Physics quiz: free practice for Cambridge Checkpoint Physics 0893. Work through this Conductors And Insulators Checkpoint Physics quiz and get instant feedback on every answer. If you get stuck, review the 1.4 Conductors and insulators lesson. More practice: Cambridge Checkpoint Physics 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
Start Quiz
1.
Using a hairdryer with wet hands is dangerous, because tap water can conduct electricity. True or false?
False – water is an insulator, so wet hands are safer
True – dissolved salts let tap water conduct
False – only sea water can conduct electricity
True, but only if the water is hot
2.
Which list contains only electrical insulators?
Copper, rubber, air and cotton
Plastic, dry wood, glass and air
Steel, glass, dry wood and plastic
Rubber, cotton, aluminium and plastic
3.
Rania clipped seven materials, one at a time, into a circuit containing a cell and an ammeter. The bar chart shows her readings. Which conclusion is best supported by her results?
Dr Dabour Hub Academy - figure 1
Only the metal objects allowed a current to flow
Pencil lead is an insulator because its current was lower
Pencil lead conducted, even though it is not a metal
Glass let through a current too small to see on the chart
4.
The plastic around the three wires inside a cable is a different colour on each wire so that the wires can be _____.
told apart easily
made to conduct
heated up safely
joined together
5.
A factory wants to save money by changing one material in the kettle in the table. Which change would make the kettle unsafe to use?
Making the cable coating from aluminium
Making the base contacts from copper
Making the on/off button from hard wood
Making the cable core from aluminium
6.
Kofi wants to find out whether a coin conducts electricity. Which order of steps is correct?
Clip in the coin, watch the lamp, then build the cell–lamp circuit, then repeat
Build a cell–lamp circuit with clips, clip in the coin, watch the lamp, then repeat
Build a cell–lamp circuit, watch the lamp, then clip in the coin and stop
Watch the lamp, build a cell–lamp circuit, then touch the coin to the cell
7.
_____ is a better conductor than copper but too expensive for wiring.
Tin
Iron
Silver
Lead
8.
In an insulator the electrons are not free to move, so insulators _____ the flow of electrons.
speed up (increase)
reverse (turn round)
inhibit (hold back)
create (produce)
9.
Grace tests which materials let a current pass by placing each one in a gap in a circuit. Why must she use the same cell and the same lamp for every material?
So the cell does not run out during her test
So the lamp will be brighter for the metals
So the material is the only thing that changes
So she can use fewer materials in the test
10.
Which term is described as: permit electric charge to move through a material?
conductor
electrons
allow current to flow
insulator
11.
All metals are conductors of electricity. True or false?
True – all metals have free electrons
False – only copper and silver conduct electricity
False – heavy metals such as steel are insulators
True, but only when the metal is hot
12.
Omar builds the circuit shown, with a steel key and a wooden lolly stick clipped into the same single loop. What will he observe, and why?
Dr Dabour Hub Academy - figure 2
The lamp lights, because the steel key is a conductor
The lamp lights dimly, because only half the circuit conducts
The lamp lights, because the cell pushes current through wood
The lamp stays off, as the wooden stick breaks the circuit
13.
Each material below is classified with a reason. Which pairing is correct?
Aluminium – insulator, as it is a very light material
Air – conductor, as its particles move about freely
Cotton – insulator, as its electrons are not free to move
Steel – insulator, as it is a very strong material
14.
In the wiring of a house, the plastic coating carries the current and the copper inside keeps people safe. True or false?
False – the copper carries the current and the plastic keeps people safe
True – plastic is the conductor and copper is the insulator
True, because the current always flows along the outside surface of each wire
False – both the copper and the plastic carry the current
15.
Match the term to its correct meaning: conductor
a material with free electrons that let current pass
a charged particle that carries current in a solution
how strongly a material opposes current
a material with no free electrons, so current cannot pass
16.
Graphite conducts electricity although it is a non-metal. - True or false?
True
False
17.
A metal saucepan often has a wooden handle, because wood is a thermal insulator, so the handle stays cool enough to hold. True or false?
True – wood lets heat pass through it only slowly
False – wood conducts heat better than metal does
False – the handle is wooden only because wood is cheap
True, but only because wood is an electrical conductor
18.
When a switch is open, the metal parts are close together, but no current flows because the air gap between them is an insulator. True or false?
False – current jumps across any small gap in a circuit
False – air is a conductor, but the gap is too long
True – air does not let current pass across the gap
True, but only if the switch is made of plastic
19.
Which statement correctly describes allow current to flow?
a material that allows current to flow
negatively charged particles
permit electric charge to move through a material
a material that inhibits current
20.
Pravin says: "Electricity does flow through plastic, only very slowly." True or false?
True – plastic lets a slow current through, which is why it is safe
True, because all materials carry some current slowly
False – current flows through plastic faster than through metal
False – plastic is an insulator, so current cannot flow through it
21.
Which statement best expresses the lesson objective about Conductors and insulators?
Define electrical conductor and insulator
The terms allow current to flow and conduct are always interchangeable
Evidence is unnecessary when studying Conductors and insulators
Every model is an exact copy of reality
22.
Ben claims: "If a material is hard and strong, it must be a conductor of electricity." True or false?
True – hard, strong materials always have electrons that are free to move
True, because only metals are hard and strong
False – glass and hard plastic are strong, yet they are insulators
False – only soft materials such as cotton conduct
23.
Each part of a piece of electrical equipment is matched to its material. Which pairing is correct?
Wire core – plastic, so it can carry the current
Screwdriver handle – plastic, to insulate the user's hand
Pylon insulator – steel, to stop current reaching the tower
Cable sheath – copper, to protect people from shocks
24.
Which statement correctly describes conductor?
a material that inhibits current
negatively charged particles
permit electric charge to move through a material
a material that allows current to flow
25.
The diagram shows the particles in two solid materials, X and Y, that are not connected to a circuit. Which material is an electrical conductor, and why?
Dr Dabour Hub Academy - figure 3
X, because each of its electrons stays neatly by its atom
Y, because its atoms are free to travel round a circuit
Y, because some electrons are not held by one atom
Neither, because no current is flowing in either picture
26.
Insulators do not contain any electrons at all, which is why current cannot flow through them. True or false?
True – with no electrons at all, there is nothing to carry the current
True, but only for insulators that are made from plastic
False – insulators contain more electrons than metals do
False – insulators have electrons, but they are not free to move
27.
Inside a mobile phone, the parts are joined by thin copper tracks printed on a board instead of by separate wires. Why are copper tracks used?
Copper tracks are insulators that stop the phone giving shocks
There is no room for wires, and copper tracks still conduct well
Separate wires would make the phone conduct heat to the hand
Copper is only a conductor when it is printed very thinly
28.
Overhead cables must hang between pylons, so they must be light, and a line 50 km long must not cost too much. Using the table, which material is the best choice?
Aluminium – it conducts well, is light and is cheaper than copper
Copper – it conducts best, so its mass and cost do not matter
Plastic – it is the lightest and cheapest material in the table
Steel – it is cheapest of the metals, so its mass does not matter
29.
Sofia clipped a very thin pencil lead into her circuit, but the lamp did not light. She knows graphite should conduct. What is the best improvement to her test?
Wrap the pencil lead in plastic tape before testing it
Test the pencil lead again with the switch left open
Use a longer pencil lead so the current has further to go
Replace the lamp with an ammeter, which can detect a small current
30.
Which practical work belongs to Conductors And Insulators?
Use a complete circuit model and distinguish electron flow from conventional current direction
Translate between a real circuit and a labelled circuit diagram
Measure current at different points in a series circuit and compare readings
Test materials in a simple circuit and classify them from evidence
31.
Silver is a worse conductor than copper, which is why copper is used. - True or false?
True
False
32.
Which statement correctly describes insulator?
a material that allows current to flow
negatively charged particles
permit electric charge to move through a material
a material that inhibits current
33.
Tariq predicted whether each object would conduct, then tested it in a circuit with a lamp. Which of his predictions were wrong?
Only the pencil lead, as the rest matched
The rubber eraser and the piece of paper
The aluminium foil and the copper coin
The pencil lead and the rubber eraser
34.
Two designs are suggested for the lever that pushes a toaster down. Design 1 is an all-steel lever. Design 2 is a steel lever with a plastic cap where the finger presses. Which is better, and why?
Design 1 – steel is stronger, so it is safer to touch when hot
Design 1 – steel conducts heat away from the finger, keeping it cool
Design 2 – plastic is an electrical and thermal insulator, so the finger is protected
Design 2 – plastic is a conductor, so current flows around the finger
35.
A steel paper clip lying on a desk has an electric current in it, because some of its electrons are always moving. True or false?
True – moving electrons always make a current
False – its free electrons move randomly, not all in one direction
True, because steel is a conductor even when no cell is connected to it
False – the electrons in steel cannot move at all
36.
A material that does not allow electric current to pass through it is called an electrical _____.
conductor
insulator
component
terminal
37.
The diagram shows a steel pylon holding power lines. An engineer suggests replacing the parts labelled X with steel ones, because steel is stronger. This change would be safe and would not waste energy. True or false?
Dr Dabour Hub Academy - figure 4
True – steel is stronger than the insulators, so the heavy wires are held up much more safely
False – current could flow into the pylon and to the ground, and shock anyone touching it
True, because steel is a poor enough conductor to stop the current
False – steel would make the power line itself stop conducting
38.
The diagram shows a plug and its cable with four parts labelled A to D. Which pairing is correct?
Dr Dabour Hub Academy - figure 5
A – metal, so current can reach the user safely
B – metal, so current can flow into the appliance
C – copper, so current flows along to the pins
D – plastic, so the user is protected from shocks
39.
Jamal stood three spoons in a beaker of hot water and measured the temperature at the top of each handle. Which is the best explanation of the steel spoon's results?
Dr Dabour Hub Academy - figure 6
Steel is a metal whose free electrons carry heat along it quickly
Steel lets the cold flow out of the handle and down into the hot water
The steel spoon was put into the water before the others
Steel is an electrical insulator, so it traps the heat
40.
Zara is designing a push switch for a torch. The part inside must complete the circuit, and the part she presses must be safe to touch. Which design meets both needs?
Metal contacts inside, pushed together by a plastic button
Plastic contacts inside, pushed together by a metal button
Metal contacts inside, pushed together by a metal button
Wooden contacts inside, pushed together by a plastic button
41.
Each object below is matched with the job its material does. Which pairing is correct?
Copper wire in a wall – keeps people safe from electric shocks
Rubber glove – carries current away from the hand to the ground
Plastic plug body – lets current flow into the appliance
Ceramic disc on a pylon – stops current flowing into the metal tower
42.
Hana dipped two metal plates, connected to a cell and an ammeter, into four liquids. Which statement best explains her results?
Water always conducts well because it is a liquid
Dissolving salt turns water into an insulator
Distilled water conducts best because it is the purest liquid tested
Dissolved salts let water conduct; more salt, more current
43.
Which step comes immediately after "close the switch"?
place the test material in the circuit
classify it as conductor or insulator
observe whether it allows current to flow
44.
Which term is described as: a material that allows current to flow?
insulator
allow current to flow
conductor
electrons
45.
The diagram shows the end of a cable cut straight across. Which labelled part carries the electric current, and why?
Dr Dabour Hub Academy - figure 7
P, because it is copper, with electrons free to move
Q, because its colour shows which wire has the current
R, because it is on the outside where it touches the plug
Q, because plastic lets electrons through slowly
46.
Trapped air is a very good thermal insulator, so a winter jacket filled with _____ keeps a person warm.
copper threads
thin steel springs
aluminium strips
fluffy feathers
47.
In a conductivity test the lamp stayed off when a steel spoon was clipped in, so Nadia concluded that steel is an insulator. Her conclusion is correct. True or false?
True – the lamp did not light, so no current flowed through steel
True, because spoons are made to insulate against heat
False – steel is a conductor only when it is very thin
False – steel is a metal; she should check the clips, lamp and cell
48.
Maya measured the temperature of three trays and touched each one. She concludes: "The steel tray felt coldest because it was at a lower temperature than the others." True or false?
True – the steel tray was at a lower temperature than the wooden tray
True, because metals let cold flow into your hand
False – all were 21 °C; steel conducts heat from the hand faster
False – the steel tray was really the warmest of the three
49.
Which term is described as: a material that inhibits current?
conductor
allow current to flow
insulator
electrons
50.
Ahmed heated one end of five rods of the same size and timed how long a bead of wax took to drop off the other end. What do his results show?
Glass and wood conducted heat faster than the metals
Steel is a thermal insulator because it took over a minute
Copper was the best thermal conductor of the rods
All three metals conducted heat equally well
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Part of Unit 9: Electricity and circuits — see every lesson and quiz in this unit.
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