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प्रश्न
Define one calorie.
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उत्तर
One calorie is the amount of heat energy required to raise the temperature of 1 gram of water through 1°C.
संबंधित प्रश्न
What is heat ? State its S.I. unit.
Define the term heat.
Fill in the blank and rewrite the sentence.
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?
Steel spoon
What will absorb heat?
Iron griddle (tava)
What will absorb heat?
Wax
What will absorb heat?
Plastic plate
Which temperature segment is chosen when determining the unit of heat? Why?
The process of converting a liquid into a solid is called ________.
Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
We reduce the heat by adding ______ while preparing fruit juice.
We can absorb heat by rubbing two surfaces of some substances.
How can heat energy be generated?
When an electric current is passing through the conductor ______ energy is produced.
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.
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?
