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 Class 7 Science: Electricity questions and answers

The diagram below represents a set up that can be used to investigate good and poor conductors of electricity.
Which one of the following materials when used to
connect wires at position K would make the bulb light?
A. Piece of thread.
B. Razor blade.
C. Piece of glass.
D. Cello tape

 (2m 52s)
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