What are the possible answers to the following questions: Micrometer screw gauge, anomalous expansion of water, and stability of a candle?

1. A micrometer screw gauge.

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2. The water level in the test tube will rise. Water exhibits anomalous expansion; it expands when cooled from $4^\circ \text{C}$ to $0^\circ \text{C}$, increasing its volume.

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3. Observation: The water level in tube X will rise, and the water level in tube Y will fall. Explanation: Bulb Q, being black, is a better absorber of heat radiation than bulb P, which is white. When the heater is turned on, the air inside bulb Q heats up and expands more than the air in bulb P. This increased expansion in Q pushes the water level down in tube Y and consequently up in tube X.

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4. The candle becomes more stable. As the candle burns, its mass decreases and its center of gravity lowers. A lower center of gravity increases the stability of an object.

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5. Earthen jars are porous, allowing water to seep through to the outer surface. This water then evaporates, taking latent heat from the remaining water inside the jar, which causes a cooling effect. Metallic jars are non-porous, so this evaporative cooling does not occur.