In summers, electric wires sag a little as ___________ on heating.

non-metals expand

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metals expand

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non-metals contract

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metals contract

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Solution

The correct option is B metals expand
Metals expand on heating and contracts on cooling. Hence, in summers, when electric wires get heated due to sun's rays, they expand and sag a little.

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Similar questions

In summers, electric wires sag a little as ___________ on heating.

On heating a metal it contracts while on cooling it expands.

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