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प्रश्न
A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because
विकल्प
friction between the layers of newspaper produces heat.
air trapped between the layers of newspaper is a bad conductor of heat.
newspaper is a conductor of heat.
newspaper is at a higher temperature than the temperature of the surrounding.
उत्तर
air trapped between the layers of newspaper is a bad conductor of heat.
Explanation:
So, heat from his body would not escape to the surroundings.
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संबंधित प्रश्न
State differences between the laboratory thermometer and the clinical thermometer.
Temperature of boiling water cannot be measured by a ______ thermometer.
Heat is a kind of energy that flows from a hot body to a cold body.
While constructing a house in a coastal area, in which direction should the windows preferably face and why?
Read the following paragraph and answer the questions based on it.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box, then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
In reference to the figure, answer the following questions:
- What does the figure illustrate?
- Explain the temperature changes observed in two objects.
- Write the principle behind this concept.
State similarities between the laboratory thermometer and the clinical thermometer.
