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Define natural magnet.
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Define artificial magnet.
Concept: undefined >> undefined
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Define electromagnet.
Concept: undefined >> undefined
Give the uses of magnets in everyday life.
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In which of the following, chemical energy is converted into heat energy?
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On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. why?
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The sum of the kinetic and potential energy is called the ______ of the molecules.
Concept: undefined >> undefined
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 |
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Heat gained by a body depends upon which factors?
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Explain the following effects of heat.
Chemical changes
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Why is a sound wave called a longitudinal wave?
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In longitudinal waves, the particle vibrates in a ______ direction of propagation.
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Sound travels in the air as ______ wave.
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The elastic property of medium is a factor of ______ medium.
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The speed of sound in air at 0°C is ______.
Concept: undefined >> undefined
Assertion: The sound of thunder is heard a little later than the flash of light.
Reason: The speed of sound is much less than the speed of light.
Concept: undefined >> undefined
