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प्रश्न
What is the criterion of choosing the two metals for a bimetal strip?
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उत्तर
Two different metals are used for regulating temperature in an electrical device as the strip bends due to different coefficients of expansion on excessive heating due to current, thus breaking the electrical circuit until the strip cools down to a preset point.
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संबंधित प्रश्न
On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.
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.
What do you understand by the anomalous expansion of water?
Explain, why are soft drink bottles not completely filled?
Explain, why does a glass bottle completely filled with water and tightly capped burst when placed in a freezer?
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 diagrams illustrate three situations involving thermometers which are labeled A, Band C. In each situation the thermometers indicate different readings.
(i) What do you expect the approximate reading of the thermometer B and C would be? Give a reason for your answer.
(ii) How would the readings of A and B help you in calibrating a thermometer?
_______ apparatus is used to study the anomalous behaviour of water.
