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प्रश्न
What are the modes of heat transfer?
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उत्तर
There are three modes of heat transfer:
- Conduction: Conduction is a process in which heat is transferred from the hotter end of an object to its cooler end.
- Convection: The process of transference of heat through a fluid (liquid or gas) is called convection.
- Radiation: Radiation is a method of heat transfer that does not require a medium.
संबंधित प्रश्न
Give two examples each of conductors and insulators of heat.
Write true or false for a given statement.
Liquids are heated by conduction and radiation.
Fill in the blank
A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________
Select the correct alternative
In the process of convection, heat travel
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
______ of heat does not require a medium.
The earth receives heat from the sun by ______.
Why is the outer coat of the penguins of Antarctica black?
Match the items in column-I to the items in column-II
| Column-I | Column-II | ||
| 1. | Linear expansion | (a) | change in volume |
| 2. | Superficial expansion | (b) | hot body to cold body |
| 3. | Cubical expansion | (c) | 1.381 X 10-23 JK-1 |
| 4. | Cubical expansion | (d) | change in length |
| 5. | Boltzmann constant | (e) | change in area |
When a liquid boils, energy is absorbed.
