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Conductors and Insulators — Free MYP2 Sciences Practice Questions
1QuestionElectrical Safety and InsulationConcept Practice
2 marks~3 minCriterion A
The diagram shows a three-pin plug with four labelled components: live wire (brown), neutral wire (blue), earth wire (green/yellow), and a fuse.
a
Identify the component designed to melt and break the circuit when too much current flows. [1]
b
Explain why this component melting is a safety feature rather than a fault. [1]
Solutions
2QuestionUses of Conductors and InsulatorsAssessment Practice
6 marks~9 minCriterion D
A kitchen designer is choosing a material for a new pot lid. The table below shows data for four materials.
| Material | Wood — thermal conductivity: low | electrical conductivity: low |
|---|---|---|
| Material | Steel — thermal conductivity: high | electrical conductivity: high |
| Material | Rubber — thermal conductivity: low | electrical conductivity: low |
| Material | Copper — thermal conductivity: high | electrical conductivity: high |
a
Identify the two materials in the table that have low thermal conductivity and low electrical conductivity. [1]
b
Explain why a material with low thermal conductivity is important for a pot lid that users will handle during cooking. [2]
c
Both wood and rubber have low thermal and electrical conductivity. Compare these two materials and suggest which is the better choice for a pot lid. Give one reason for your choice. [3]
Solutions
3QuestionGood Conductors vs Poor ConductorsConcept Practice
2 marks~3 minCriterion B
A student builds a circuit with a battery, wires, and a bulb. They test four materials — a copper coin, an iron nail, a wooden stick, and a plastic ruler — by inserting each one into the circuit and observing the bulb's brightness.
a
Identify the independent variable in this investigation. [1]
b
Explain why the bulb's brightness cannot be the independent variable. [1]
Solutions
4QuestionMaterials That Conduct ElectricityAssessment Practice
6 marks~9 minCriterion C
Students tested four materials in a simple circuit with a bulb and a battery, recording whether the bulb lit up across three trials.
Copper — Trial 1: bright, Trial 2: bright, Trial 3: bright
Plastic — Trial 1: not lit, Trial 2: not lit, Trial 3: not lit
Graphite — Trial 1: dim, Trial 2: dim, Trial 3: not lit
Wood — Trial 1: not lit, Trial 2: dim, Trial 3: not lit
Copper — Trial 1: bright, Trial 2: bright, Trial 3: bright
Plastic — Trial 1: not lit, Trial 2: not lit, Trial 3: not lit
Graphite — Trial 1: dim, Trial 2: dim, Trial 3: not lit
Wood — Trial 1: not lit, Trial 2: dim, Trial 3: not lit
a
Identify whether each material is a conductor, insulator, or partial conductor, based on the majority result across its three trials. [2]
b
Explain why the results for wood are less reliable than the results for the other three materials. [2]
c
Compare graphite's performance to copper's, and state whether the data supports the claim "Graphite is a good conductor of electricity." [2]
Solutions
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