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प्रश्न
Give reasons:
Water pipes burst in severe winters.
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उत्तर
During severe winters when the temperature starts falling below 4°C, water in pipelines expands (due to the property of anomalous expansion of water), and it exerts large pressure on the pipes, causing them to burst.
संबंधित प्रश्न
Water is used as a cooling agent.
Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?
What is the role of the anomalous behaviour of water in preserving aquatic life in regions of cold climate?
Explain the following:
How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew?
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
What do you mean by the anomalous expansion of water?
Draw a graph to show the variation in density of water with temperature in the range from 0°C to 10°C.
Explain the following
A glass bottle completely filled with water and tightly closed at room temperature is likely to burst when kept in the freezer of a refrigerator.
Explain, why are soft drink bottles not completely filled?
A deep pond of water has its top layer frozen. What will be the likely temperature of water layer just in contact with ice?
The following figure shows a metal cylinder, containing boiling water. One half side A is polished and another half, B is painted black. Two thin metal sheets X and Y are painted black and have one rubber stopper fixed with wax on each sheet. These sheets are equidistant from the boiling water (container A, B) as shown in the diagram. What would you expect to happen after a few minutes? Give a reason for your answer.
What will be the approximate temperature of water in the lake shown in the following diagram?
(i) At X, and
(ii) At Y?
Draw a neat and labelled diagram of Hope’s apparatus.
Observe the given picture and answer the following questions.
- Which property do you understand in this picture?
- What is the temperature of the water at the surface?
- What is the temperature below the layer of ice on the surface?
Match the columns:
| Column ‘A’ | Column ‘B’ |
| The density of water is maximum at | (a) 0°C |
| (b) 4°C | |
| (c) 100°C |
