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  Physics  Practice questions 1-25 1. Who discovered the law of gravitation? – Isaac Newton 2. What is the SI unit of force? – Newton (N) 3. The speed of light is approximately how many km/s? – 3,00,000 km/s 4. What is the unit of electrical resistance? – Ohm (Ω) 5. Which instrument is used to measure atmospheric pressure? – Barometer 6. Which planet is known as the "morning star"? – Venus 7. What is the boiling point of water at sea level in Celsius? – 100°C 8. What is the chemical formula of water? – H₂O 9. What is the SI unit of power? – Watt (W) 10. What type of energy is stored in a stretched spring? – Potential Energy 11. What is the first law of motion called? – Law of Inertia 12. Who invented the electric bulb? – Thomas Edison 13. Which mirror is used in car rear-view mirrors? – Convex Mirror 14. Which type of lens is used to correct myopia? – Concave Lens 15. What type of current is supplied to homes? – Alternating Current (AC) 16. The rate of doing work is called? –...