Advertisements
Advertisements
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.
Advertisements
उत्तर
- Position P will feel warmer than T because when the air gets heated, it rises upwards.
- P → Convection
T → Radiation
APPEARS IN
संबंधित प्रश्न
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
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.
What will absorb heat?
Steel spoon
What will absorb heat?
Glass vessel
Give scientific reason.
Dew drops form on the grass in winter.
When an object is heated, the molecules that make up the object
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.
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?
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 |
