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प्रश्न
Observe the picture given in figure. Water is being boiled in a pan of wide base.
- Which position P or T will feel warmer?
- Fill up the boxes P and T to indicate the mode of flow of heat to the hand.
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उत्तर
- Position P will feel warmer than T because when the air gets heated, it rises upwards.
- P → Convection
T → Radiation
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संबंधित प्रश्न
Match the following
| Column A | Column B |
| 1. mercury | 1. insulator |
| 2. wood | 2. water from 0°C to 4°C |
| 3. Aluminum | 3.absorbs |
| 4. contracts | 4.conductor |
| 5.black surface | 5. Thermometer |
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What will absorb heat?
Wax
Complete the following sentence:
CGS units of heat is _________
When an object is heated, the molecules that make up the object
The unit of heat and temperature are the same.
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
In the arrangements A and B shown in the following figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. why?
