Lesson T5.1.3
T5.1.3 Conductors and insulators Quiz: KS3 Physics, Unit 5
20 questions
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Lesson T5.1.3, Conductors and insulators: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 5: Electricity and magnetism, written with Revision Ninja.
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The 20 questions
-
What is the term for a material that allows charge to flow easily?
- Conductor
- Insulator
- Resistor
- Semiconductor
-
What is the term for a material that prevents charge flowing easily?
- Conductor
- Generator
- Insulator
- Transformer
-
Which of these materials is a good electrical conductor?
- Rubber
- Copper
- Plastic
- Wood
-
Which of these materials is a good electrical insulator?
- Copper
- Rubber
- Aluminium
- Iron
-
Why are metal electrical wires typically coated in a layer of plastic?
- Plastic adds colour
- Plastic lowers weight
- Plastic is insulating
- Plastic increases current
-
Which material is a good electrical insulator?
- Glass
- Iron
- Copper
- Aluminium
-
What carries the electrical charge through a metal conductor?
- Ions
- Protons
- Neutrons
- Free electrons
-
How does the resistance of an electrical insulator compare to a conductor?
- About equal
- Much lower
- Much higher
- Zero
-
What material is commonly used to insulate metal kettle handles?
- Steel
- Plastic
- Copper
- Silver
-
Which alloy has a high resistance and is used in heating elements?
- Solder
- Bronze
- Brass
- Nichrome
-
Which polymer is commonly used as an insulator to coat electrical cables?
- PVC plastic
- Lead
- Steel
- Graphite
-
Why do overhead power lines use bare metal rather than plastic as conductors?
- Low electrical resistance
- Increased flexibility
- High thermal insulation
- Magnetic shielding
-
What causes free electrons to drift through a metal conductor?
- Potential difference
- Air pressure
- Sound waves
- Magnetic field
-
What is the primary purpose of insulating the outside of a copper wire?
- Increasing current
- Preventing electric shocks
- Decreasing mass
- Adding colour
-
Which pair contains two good electrical conductors?
- Glass and wood
- Plastic and rubber
- Copper and iron
- Wood and plastic
-
Which pair contains two electrical insulators?
- Copper and silver
- Iron and aluminium
- Gold and brass
- Glass and rubber
-
What effect does making a wire longer have on its resistance?
- Removes resistance
- Decreases resistance
- No effect
- Increases resistance
-
What effect does a very high resistance have on circuit current?
- Reduces current
- Increases current
- Doubles current
- No effect
-
Which material is most suitable for the outer body of a mains plug?
- Plastic
- Copper
- Aluminium
- Steel
-
Why does a thin wire get hotter than a thick wire with equal current?
- Higher resistance
- More electrons
- Lower resistance
- Less voltage
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