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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
Name the three modes of transfer 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?
Plastic plate
Give scientific reason.
Dew drops form on the grass in winter.
Name the SI unit of heat.
Find the odd one out and give its explanation.
Which temperature segment is chosen when determining the unit of heat? Why?
Write scientific reason.
In the cold regions, snow falls in winter.
The unit of heat is
Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
We feel the heat on our body when the ______ shines.
When an electric current is passing through the conductor ______ energy is produced.
A marble tile would feel cold as compared to a wooden tile on a winter morning because the marble tile ______.
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?
In the arrangements A and B shown in the following figure, 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.
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 |
Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.
