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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 |
Concept: undefined >> undefined
Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.
Concept: undefined >> undefined
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You would have noticed some space being left on railway tracks. Why?
Concept: undefined >> undefined
Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.
Concept: undefined >> undefined
Electricity produced on rubbing is ______.
Concept: undefined >> undefined
A tiny particle that rotates around the nucleus of an atom is ______.
Concept: undefined >> undefined
Vibrations in a body produce ______.
Concept: undefined >> undefined
Longitudinal waves are produced in solids liquids and also in gases.
Concept: undefined >> undefined
In which medium the speed of the sound is maximum?
Concept: undefined >> undefined
What types of medium are required for sound to travel?
Concept: undefined >> undefined
What happens to the speed of sound when it gases from a solid to a gaseous state?
Concept: undefined >> undefined
Write any two uses of ultrasonic sound.
Concept: undefined >> undefined
What do you understand by the term echo?
Concept: undefined >> undefined
What are the uses of infrasonic sound?
Concept: undefined >> undefined
Explain the types of mechanical waves.
Concept: undefined >> undefined
It is believed that they had ______ known the property of magnets even before 200 BC.
Concept: undefined >> undefined
The most reactive metal is ______.
Concept: undefined >> undefined
Atoms or groups of atoms having a charge are called ______.
Concept: undefined >> undefined
