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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
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 To freeze water into ice, a large quantity of heat is to be withdrawn.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 is heat ? State its S.I. unit.
Cooking utensils are made from metals due to their property of ______.
What will absorb heat?
Iron griddle (tava)
What will absorb heat?
Glass vessel
With the help of a diagram, show that water is a bad conductor of heat.
Define one calorie.
The sun gives us light and heat.
We can absorb heat by rubbing two surfaces of some substances.
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 |
