Which of these could be used to complete an electrical circuit?

A piece of gravel.

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A rubber.

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A crayon

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Scissors made of iron

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Solution

The correct option is B Scissors made of iron
Scissors made of iron could be used to complete an electrical circuit. As iron is metal and conductor so can conduct electricity easily. And others are non-metals. So they could not conduct electricity and can't complete the circuit.

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A device which is used to break or complete an electric circuit is called __________.

Question 7

Paheli is running short of connecting wires. To complete an electric circuit, she may use a

(a) Glass bangle

(b) Thick thread

(d) Steel spoon

(a) Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

(b) Describe how an electromagnet could be used to separate copper from iron in a scrap yard.

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