Question

The figure shows 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?

(1) The level of alcohol falls in both limbs.

(2) The level of alcohol in the limb X rises while that in limb Y falls.

(3) The level of alcohol in limb X falls while that in limb Y rises.

(4) There is no change in the levels of alcohol in the two limbs.​

Answer 1

Answer:

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Answer 2

We know that absorptivity of black colour is more than that of white. Hence, when the bulb is switched on, black bulb will absorb more heat and hence the air above alcohol in tube X will expand more than the air above alcohol in tube Y as a result of which alcohol in limb X will fall and rise in limb Y.

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