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प्रश्न
When an object is heated, the molecules that make up the object
पर्याय
begin to move faster
lose energy
become heavier
become lighter
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उत्तर
Begin to move faster
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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 |
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
What will absorb heat?
Soil
The unit of heat is
If you apply some heat energy to a substance, which of the following can take place in it?
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
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?
Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.
In which of the following, chemical energy is converted into heat energy?
