The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted.

The level of alcohol in limb X falls while that in limb Y rises

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The level of alcohol in limb X rises while that in limb Y falls

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The level of alcohol falls in both limbs

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There is no change in the levels of alcohol in the two limbs

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Solution

The correct option is A The level of alcohol in limb X falls while that in limb Y rises
Black bulb absorbs more heat in comparison with painted bulb. So air in black bulb expands more. Hence the level of alcohol in limb X falls while that in limb Y rises.

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The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted.

The correct option is A The level of alcohol in limb X falls while that in limb Y risesBlack bulb absorbs more heat in comparison with painted bulb. So air in black bulb expands more. Hence the level of alcohol in limb X falls while that in limb Y rises.

The correct option is A The level of alcohol in limb X falls while that in limb Y rises
Black bulb absorbs more heat in comparison with painted bulb. So air in black bulb expands more. Hence the level of alcohol in limb X falls while that in limb Y rises.