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प्रश्न
Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
टीपा लिहा
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उत्तर
Lakes don’t completely freeze because the ice (and eventually snow) on the surface acts to insulate die water below. To freeze water into ice, a large quantity of heat is to be withdrawn. This heat cannot be
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पाठ 4: Heat - Exercises [पृष्ठ ४४]
APPEARS IN
संबंधित प्रश्न
What will absorb heat?
Steel spoon
What will absorb heat?
Wax
What will absorb heat?
Soil
A wooden knob and a metal latch on a door are both at room temperatures. Explain, why the latch is colder to touch.
We reduce the heat by adding ______ while preparing fruit juice.
______ energy can be generated by the burning of fuels like coal, wood, charcoal, gasoline, etc.
The SI unit of heat energy is ______.
What is heat energy?
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?
