Fill in the blanks
1. _________ state of matter can undergo all the three thermal expansion.
2. _________ is the loudest sound tolerated by human ear.
3. We can replace electric bulb by __________ to conserve electricity.
4. A switch is connected to the _______ wire.
5. An instrument used to detect and measure the electric charges is called ______.
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Answer: 1) All three states of matter (solid, liquid and gas) expand when heated.
2) A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB
3)
4) A switch or a fuse is always connected to the live wire.
5) electroscope
Explanation: