Question

A vertical glass jar is filled with water at 10°C. It has one thermometer at the top and another at the bottom. The bottom central region of the jar is gradually cooled. It is found that the bottom thermometer reads 4°C earlier than the top thermometer and the top thermometer reads 0°C earlier than the bottom thermometer. This happens because: a) the top thermometer is faulty b) the bottom thermometer is faulty c) both the thermometers are faulty d) water expands when cooled from 4°C to 0°C

Answer 1

Answer:

A vertical glass jar is filled with water at 10∘C. It has one thermometer at the top and another at the bottom. The central region of the jar is gradually cooled. It is found that the bottom thermometer reads 4∘C earlier than the top thermometer. And the top thermometer reads 0∘C earlier than the bottom thermometer. This happens because

The top thermometer is faulty

The bottom thermometer is faulty

Both the thermometers are faulty

Water expands when cooled from 4∘C to 0∘C.

Answer 2

Answer:

* A vertical glass jar is filled with water at 10°C. It has one thermometer at the top and another at the bottom. The bottom central region of the jar is gradually cooled. It is found that the bottom thermometer reads 4°C earlier than the top thermometer and the top thermometer reads 0°C earlier than the bottom thermometer. This happens because:

→ on cooling, water becomes of the highest density at 4°C and then it goes down. therefore bottom thermometer reads 4°C, becoz the temperature of the water at the top will be more than 4°C.