1. Why is science called an "ever-evolving" subject? Explain with an example.
2.A scientific theory may change, but a scientific law usually does not. Explain the difference between a scientific law and a scientific theory.
3. Explain why imagination alone cannot lead to scientific discoveries.
4. Why is collaboration among scientists important for the progress of science?
5. Explain how scientific discoveries can have both positive and negative impacts on society.
6. Explain how an indicator helps in identifying acids and bases. Why is it called an indicator?
7. Explain why neutralisation is considered both a useful and a potentially dangerous process.
8. Why is a closed circuit necessary for an electric bulb to glow?
9. Differentiate between an electric conductor and an electric insulator with two examples each.
10. What will happen if one bulb in a series circuit fuses? Explain the reason.
11. Explain the difference between an electric cell and a battery.
12. A bulb does not glow even though the circuit appears complete. Give four possible reasons.
13. Why is it important to use the correct circuit symbols while drawing circuit diagrams?
14. Why is a short circuit dangerous even if the electrical appliance is switched off?
15. A bulb glows when connected to Cell A but not when connected to Cell B. How can you determine whether the problem is with the cell or the bulb?
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