Anomalous Expansion of Water

Q. In cold countries how do aquatic animals remain alive even after the rivers or lakes freeze in winter.

Q.

At 4^oC, water has minimum density and maximum volume.

1. True

2. False

Q.

Which of the following is not a result of evaporation?

1. It contracts

2. It disappears

3. It changes colors

4. It expands

Q.

Water from lakes, rivers and dams is transported to the cities through long pipes. These are the water pipelines.

People have noticed that these pipelines often burst in winter when temperatures drop below $4^{o}C$. Why do you think this happens?

1. Anomalous expansion of water.

2. Evaporation of water.

3. Condensation of water.

4. None of these.

Q.

Water from lakes, rivers and dams is transported to the cities through long pipes. These are the water pipelines.

People have noticed that these pipelines often burst in winter when temperatures drop below $4^{o}C$. Why do you think this happens?

1. Anomalous expansion of water.

2. Evaporation of water.

3. Condensation of water.

4. None of these.

Q. WHEN DOES WATER HAVE MINIMUM VOLUME (TEMPERATURE)?

Q. Melting of ice takes place at _____ deg C.

1. 100
2. 50
3. 25
4. 0

Q.

The density of water is highest at:

1. $0^{o}C$

2. $4^{o}C$

3. ${27}^{o}C$

4. ${100}^{o}C$

Q.

Active mass of a solid is taken as_______.

Q. Which of the following has maximum conductivity?

1. Distilled water
2. Rain water
3. River water
4. Purified drinking water