100 Interesting Physics GK One Liners – General Knowledge for Exams

Best Physics GK For Quick Revision

Physics is called the fundamental science because it explains the laws of nature, matter, energy, motion, force, and the universe. For competitive exams like SSC, UPSC, NEET, JEE, Railways, Defence, and Banking, Physics GK is one of the most important sections.

Here we present 100 Interesting Physics GK One Liners – short, crisp, and exam-oriented.

Basic Physics Facts

  1. Father of Physics – Galileo Galilei
  2. Father of Modern Physics – Albert Einstein
  3. SI unit of Force – Newton (N)
  4. SI unit of Power – Watt (W)
  5. SI unit of Work – Joule (J)
  6. SI unit of Energy – Joule (J)
  7. SI unit of Pressure – Pascal (Pa)
  8. SI unit of Frequency – Hertz (Hz)
  9. SI unit of Electric Current – Ampere (A)
  10. SI unit of Resistance – Ohm (Ω)

Motion, Gravity & Laws

  1. Acceleration due to gravity – 9.8 m/s²
  2. Escape velocity of Earth – 11.2 km/s
  3. First Law of Motion – Law of Inertia
  4. Second Law of Motion – F = ma
  5. Third Law of Motion – Action = Reaction
  6. Universal Gravitational Constant (G) – 6.67 × 10⁻¹¹ Nm²/kg²
  7. Law of Gravitation – Newton
  8. Absolute zero temperature – 0 K (−273.15°C)
  9. Density of water – 1000 kg/m³
  10. Speed of light – 3 × 10⁸ m/s

Discoveries & Scientists

  1. Proton discovered by – Ernest Rutherford
  2. Neutron discovered by – James Chadwick
  3. Electron discovered by – J.J. Thomson
  4. X-rays discovered by – Wilhelm Roentgen
  5. Radioactivity discovered by – Henri Becquerel
  6. Battery invented by – Alessandro Volta
  7. Dynamo invented by – Michael Faraday
  8. Barometer invented by – Torricelli
  9. Telescope invented by – Hans Lippershey
  10. MRI principle – Nuclear Magnetic Resonance

Atomic & Nuclear Physics

  1. Mass of electron – 9.1 × 10⁻³¹ kg
  2. Charge of electron – −1.6 × 10⁻¹⁹ C
  3. Mass of proton – 1.67 × 10⁻²⁷ kg
  4. Proton charge – +1.6 × 10⁻¹⁹ C
  5. Neutron charge – Neutral (0)
  6. Isotopes – Same element, different neutrons
  7. Isobars – Same mass, different atomic number
  8. Fusion reaction – Combining light nuclei
  9. Fission reaction – Splitting heavy nuclei
  10. Sun’s energy source – Nuclear Fusion of Hydrogen

Light & Optics

  1. Prism splits light into – Spectrum
  2. Rainbow forms due to – Dispersion of light
  3. Sky appears blue due to – Scattering of light
  4. Red is used in traffic lights because – Least scattered
  5. Convex lens – Converging lens
  6. Concave lens – Diverging lens
  7. Microscope uses – Convex lenses
  8. Fibre optics work on – Total internal reflection
  9. Holography uses – Laser
  10. Critical angle – Angle where TIR starts

Sound & Waves

  1. Speed of sound in air – 343 m/s
  2. Speed of sound in water – 1482 m/s
  3. Speed of sound in steel – 5960 m/s
  4. Unit of loudness – Decibel (dB)
  5. Decibel scale – Logarithmic
  6. Infrasound – Below 20 Hz
  7. Ultrasound – Above 20,000 Hz
  8. SONAR uses – Ultrasound waves
  9. Doppler Effect – Change in frequency due to motion
  10. Echo – Reflected sound wave

Heat & Thermodynamics

  1. Thermometer invented by – Galileo
  2. Kelvin scale – Lord Kelvin
  3. Boyle’s Law – PV = Constant
  4. Charles’s Law – V ∝ T
  5. Pascal’s Law – Pressure equal in liquid
  6. Carnot engine – Ideal heat engine
  7. Specific heat of water – 4200 J/kgK
  8. Heat transfer by radiation – Sunlight
  9. Heat transfer by convection – Air circulation
  10. Heat transfer by conduction – Metal rod heating

Electricity & Magnetism

  1. Ohm’s law – V = IR
  2. Faraday’s law – Electromagnetic induction
  3. Fleming’s Left-hand rule – Motor principle
  4. Fleming’s Right-hand rule – Generator principle
  5. Ampere’s law – Magnetic effect of current
  6. Unit of capacitance – Farad (F)
  7. Unit of inductance – Henry (H)
  8. Electromagnet invented by – William Sturgeon
  9. Transformer invented by – William Stanley
  10. First battery – Voltaic pile

Modern Physics

  1. Quantum theory – Max Planck
  2. Uncertainty principle – Heisenberg
  3. Wave mechanics – Schrödinger
  4. Theory of relativity – Einstein
  5. Photoelectric effect – Einstein (Nobel Prize)
  6. Laser principle – Stimulated emission
  7. Cosmic rays – High energy radiation from space
  8. Black hole – Region of infinite gravity
  9. Planck’s constant – 6.626 × 10⁻³⁴ Js
  10. Bohr’s model – Electrons in orbits

Extra GK & Facts

  1. Ozone layer protects from – UV rays
  2. Most abundant element in universe – Hydrogen
  3. Work is done when – Force causes displacement
  4. Cathode rays – Electrons
  5. Anode rays – Protons
  6. MRI uses – Magnet + Radio waves
  7. Sunlight takes – 8 minutes 20 seconds to reach Earth
  8. Universe age – Approx. 13.8 billion years
  9. Physics is called – Fundamental Science
  10. “Physics” word origin – Greek, meaning Nature

Conclusion

Physics is not just about formulas – it explains the universe, energy, motion, light, sound, and life itself. These 100 one-liner Physics GK facts are extremely useful for students, exam aspirants, and curious learners.

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