Question
Question: The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. Wh...
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
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
The level of alcohol in limb X falls while that in limb Y rises
Explanation
Solution
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.