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The World of Metals and Non-metals — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceThe World of Metals and Non-metals2 Marks
Question
Observation : Table : Conduction of electricity by different objects or materials
Object/ MaterialObservation (bulb glows/
does not glow)		Good conductor of electricity
or poor conductor of electricity
Piece of aluminium foilBulb slowsGood conductor of electricity
Iron nailBulb slowsGood conductor of electricity
Lump of sulphur (peasized)Bulb does not glowPoor conductor of electricity
CooDer wireBulb slowsGood conductor of electricity
Piece of coalBulb does not glowPoor conductor of electricity
Piece of dry woodBulb does not glowPoor conductor of electricity
StoneBulb does not glowPoor conductor of electricity
✓

Answer

Conclusion : Materials like aluminium, iron and copper allows electricity to pass through them. So, they are good conductors of electricity.
Materials like sulphur, coal, dry wood, stone, eraser and nylon do not allow electricity to pass through them. So, they are poor conductors of electricity.

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