OSTP Science Grade 5 Practice Questions - Oklahoma School Testing Program - Science, Grade 5 Exam

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During an electrical conductivity investigation, a student connects four test materials into a simple circuit with a 1.5V battery and a light bulb. The results are shown below: [Data Table: Electrical Circuit Testing] - Material A (Copper Strip): Light bulb shines brightly - Material B (Plastic Straw): Light bulb does not light - Material C (Salt Water Solution): Light bulb shines brightly - Material D (Dry Wooden Stick): Light bulb does not light Which statement correctly classifies these materials based on their physical properties?

Copper and salt water solution are electrical conductors, while plastic and dry wood are electrical insulators. All solid materials act as electrical insulators, while all liquids act as electrical conductors. Plastic and dry wood undergo a chemical change when placed in an electrical circuit. Material C is an insulator because dissolved solids block electric current.

Correct Answer:

Copper and salt water solution are electrical conductors, while plastic and dry wood are electrical insulators.

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