DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: 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 is placed midway between the painted air filled bulbs and electric bulb is lighted?

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