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(A) black surface is a better absorber of thermal radiation compared to a white or shiny surface. When the electric bulb is lighted,it emits thermal r

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

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(A) black surface is a better absorber of thermal radiation compared to a white or shiny surface. When the electric bulb is lighted,it emits thermal radiation in all directions. The black bulb absorbs more heat energy from this radiation than the white bulb. As a result,the air inside the black bulb expands more significantly due to the higher temperature increase. This increased pressure pushes the alcohol level down in limb $X$. Consequently,the alcohol level in limb $Y$ rises. Therefore,the correct observation is that the level of alcohol in limb $X$ falls while that in limb $Y$ rises.

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