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. Options: A . &nbsp The level of alcohol in limb X falls while that in limb Y rises B . &nbsp The level of alcohol in limb X rises while that in limb Y falls C . &nbsp The level of alcohol falls in both limbs D . &nbsp There is no change in the levels of alcohol in the two limbs

The following figure shows two air-filled bulbs connected by a U-tube partly fil

Discussion Forum : Heat Transfer

Question -

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.

Options:

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

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

C . The level of alcohol falls in both limbs

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

Answer: Option A
:
A

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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