The bulb of thermometer when dipped in petrol and taken out, the level of the mercury thread in the thermometer

starts falling

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starts rising

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remains at the same level

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initially falls and then rises

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Solution

The correct option is A
starts falling
On taking out the bulb of the thermometer to the atmosphere, evaporation of petrol takes place.

Since evaporation causes cooling, the mercury thread in the thermometer starts falling.

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The bulb of thermometer when dipped in petrol and taken out, the level of the mercury thread in the thermometer

The correct option is A starts fallingOn taking out the bulb of the thermometer to the atmosphere, evaporation of petrol takes place. Since evaporation causes cooling, the mercury thread in the thermometer starts falling.

The correct option is A
starts falling
On taking out the bulb of the thermometer to the atmosphere, evaporation of petrol takes place.

Since evaporation causes cooling, the mercury thread in the thermometer starts falling.