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Physics CBSE Live product
Class 7 (2025-26)
Electricity: Circuits and their components
Revision II - Electricity: Circuits and their components
9.
Electric conductors and insulators
Question:
5
m.
Choose the best answer for the following questions:
1.
Conductors
-
Materials that allow electric current to flow freely
Materials through which electric current cannot pass
Materials that do not allow electric current to pass through them
Materials that allow electric current to flow for few minutes only
2.
Silver
-
One of the best conductors of electricity, but too expensive for regular use in electrical wiring
One of the best conductors of heat but expensive for regular wire use
One of the best conductors of electricity but cheap for regular wire use
One of the bad conductors of electricity but expensive for regular wire use
3.
Safety
-
The main reason electrical wires are covered with rubber and copper
The main reason electrical wires are covered with copper or silver
The main reason electrical wires are covered with copper and plastic
The main reason electrical wires are covered with rubber or plastic
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