Advertisements
Advertisements
प्रश्न
Ice is kept in a double-walled container. Why?
Advertisements
उत्तर
Ice is kept in a double-walled container so as to prevent melting of ice from the heat absorbed present in the immediate surroundings. The vacuum present in between the two walls prevents the transfer of heat from the first to the second wall and hence the ice remains in the solid form for a longer time period.
APPEARS IN
संबंधित प्रश्न
Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.
Define the term calorie. How is it related to joule (the S.I. unit of heat)?
Cooking utensils are made from metals due to their property of ______.
What will absorb heat?
Soil
The unit of heat is
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
How can heat energy be generated?
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?
The sum of the kinetic and potential energy is called the ______ of the molecules.
Match the following:
| Column A | Column B | ||
| 1. | Heat | a. | Heat gained or lost in the change of state without any change in temperature |
| 2. | m × L. | b. | Heat gained or lost when there is no change of state |
| 3. | Temperature | c. | Form of energy |
| 4. | m × s × t | d. | SI unit of specific latent heat |
| 5. | J/Kg | e. | degree of hotness or coldness |
