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प्रश्न
Name the SI unit of heat.
Write the SI unit of heat.
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उत्तर
Joule (J) is the SI unit of heat.
संबंधित प्रश्न
Fill in the blank
Heat is a form of _______.
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 |
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)?
If objects of equal masses are given equal heat, their final temperature will be different. This is due to difference in their ______.
What will absorb heat?
Glass
What will absorb heat?
Wooden spoon
If you apply some heat energy to a substance, which of the following can take place in it?
Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
______ energy can be generated by the burning of fuels like coal, wood, charcoal, gasoline, etc.
In the past, people used to rub two wooden pieces together to light fire.
A circular metal loop is heated at point O as shown in the following figure.
- In which direction would heat flow in the loop?
- In which order are the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
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.
Black color is a ______ absorber of heat.
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 |
Heat gained by a body depends upon which factors?
