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प्रश्न
Name the SI unit of heat.
उत्तर
Joule is the SI unit of heat.
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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 |
Select the correct alternative
A thermometer uses
What is heat ? State its S.I. unit.
While deciding the unit for heat, which temperature interval is chosen? Why?
What will absorb heat?
Iron griddle (tava)
Give a scientific reason.
In winter, why does an iron pillar feel colder than a wooden pole?
The unit of heat and temperature are the same.
The process of converting a liquid into a solid is called ________.
______ is a form of energy.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
In arrangements, A and B shown in Figure 4.7, 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.
Black color is a ______ absorber of heat.
In summer, we prefer light – colored clothes and in winter we usually wear dark – colored clothes.
Match the following
| 1. | Heat | a. | Good absorber |
| 2. | Temperature | b. | Form of energy |
| 3. | Black surface | c. | Insulators |
| 4. | Rubber, cork | d. | The measure of hotness or coldness |
Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.
You would have noticed some space being left on railway tracks. Why?
In which of the following, chemical energy is converted into heat energy?
Warm air is ______.
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 |
