Why is it necessary to turn off gas supply after an earthquake?

It is not necessary to turn it off.

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It is just something expected to be done after an earthquake for no particular reason.

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Because damaged gas lines can cause fires.

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Because the smell of the gas is very bad and people will not be able to tolerate it if it leakes.

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Solution

The correct option is C Because damaged gas lines can cause fires.
It necessary to turn off gas supply after an earthquake because the strong ground movement can damage the pipelines and cause a leak. A gas leak undetected will find an ignition source. This will lead to explosion and fire.

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The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because

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1. On heating it gives off a gas and leaves residue.

2. It burns in air to form carbon dioxide and water.

3. It changes into solid at 273 K and to gas at 373 K.

I don't know about elements so can you please explain the answer?

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