Physics
Physics GK – Test Your Science Knowledge!
Explore fascinating Physics General Knowledge questions and answers covering concepts like motion, energy, light, electricity, and famous scientists. Perfect for students, quiz lovers, and competitive exam preparation. Sharpen your science knowledge with these interesting physics facts!
Physics GK – Questions and Answers
Motion & Force
1. Who discovered the law of gravitation? – Isaac Newton
2. What is the first law of motion also known as? – Law of Inertia
3. Which law states "every action has an equal and opposite reaction"? – Newton's Third Law of Motion
4. Which law explains why we wear seatbelts? – Newton's First Law of Motion
5. Which law explains why rockets move? – Newton's Third Law of Motion
6. What is the force that opposes motion called? – Friction
7. What is the acceleration due to gravity on Earth (approx.)? – 9.8 m/s²
8. What is the SI unit of force? – Newton (N)
9. What is the SI unit of momentum? – kg·m/s
10. What is the SI unit of angular momentum? – kg·m²/s
11. What is the SI unit of torque? – Newton metre (N·m)
Energy & Work
12. What is the SI unit of work/energy? – Joule (J)
13. What is the SI unit of power? – Watt (W)
14. What is the rate of doing work called? – Power
15. What type of energy is stored in a stretched spring? – Potential Energy
16. What type of energy is possessed by a moving body? – Kinetic Energy
17. What type of energy is stored in food? – Chemical Energy
18. What type of energy is stored in a battery? – Chemical Energy
19. What type of energy is possessed by water stored in a dam? – Potential Energy
20. Which energy source is a renewable source? – Solar energy
21. Which device converts solar energy into electricity? – Solar cell
22. Which energy is produced by moving water? – Hydroelectric energy
23. Which type of energy is used in nuclear power plants and released in an atomic bomb? – Nuclear energy
Heat & Gas Laws
24. What is the boiling point of water at sea level (in °C)? – 100°C
25. What is the freezing point of water (in Kelvin)? – 273 K
26. What is the SI unit of heat? – Joule (J)
27. What is the SI unit of temperature? – Kelvin (K)
28. Which instrument is used to measure temperature? – Thermometer
29. Which law states that the volume of a gas is inversely proportional to its pressure? – Boyle's Law
30. Which law explains the relationship between pressure, volume, and temperature of a gas? – Combined Gas Law
Light & Optics
31. What is the speed of light in vacuum (approx.)? – 3 × 10⁸ m/s (3,00,000 km/s)
32. Which color of visible light has the longest wavelength? – Red
33. Which color of visible light has the shortest wavelength? – Violet
34. Which phenomenon explains the bending of light (e.g., a pencil looking bent in water)? – Refraction
35. Which phenomenon explains the splitting of white light into colors? – Dispersion
36. Which phenomenon causes the sky to appear blue? – Scattering of light
37. Which phenomenon explains the twinkling of stars? – Atmospheric refraction
38. Which type of wave is light? – Transverse wave
39. Which type of mirror is used in car rear-view mirrors? – Convex mirror
40. Which type of mirror is used in vehicle headlights, torch lights, solar cookers, and by dentists? – Concave mirror
41. Which type of lens is used to correct myopia (short-sightedness)? – Concave lens
42. Which type of lens is used to correct hypermetropia (long-sightedness)? – Convex lens
43. Which type of lens is used in a magnifying glass? – Convex lens
44. What is the SI unit of the power of a lens? – Dioptre (D)
45. What is the SI unit of illumination? – Lux
Sound
46. Which type of wave is sound? – Longitudinal wave
47. Sound waves cannot travel through which medium? – Vacuum
48. What is the approximate speed of sound in air? – 343 m/s
49. What is the unit used for sound intensity level? – Decibel (dB)
Electricity & Magnetism
50. What is the SI unit of electric current? – Ampere (A)
51. What is the SI unit of electrical resistance? – Ohm (Ω)
52. What is the SI unit of potential difference/voltage? – Volt (V)
53. What is the SI unit of electric charge? – Coulomb (C)
54. What is the SI unit of electric power? – Watt (W)
55. What is the SI unit of electric conductance? – Siemens (S)
56. What is the SI unit of capacitance? – Farad (F)
57. What is the SI unit of inductance? – Henry (H)
58. What is the SI unit of electric field strength? – Newton per coulomb (N/C)
59. What is the SI unit of magnetic flux? – Weber (Wb)
60. What is the SI unit of magnetic field strength? – Tesla (T)
61. Which law explains the relationship between current, voltage, and resistance? – Ohm's Law
62. Which scientist formulated the law of electromagnetic induction and built the first dynamo? – Michael Faraday
63. What type of current is supplied to homes? – Alternating Current (AC)
64. Which device converts AC to DC? – Rectifier
65. Which device is used to store electric charge? – Capacitor
66. Which instrument measures electric current? – Ammeter
67. Which instrument measures electric resistance? – Ohmmeter
68. Which instrument measures electric power? – Wattmeter
69. Which device measures both current and voltage? – Multimeter
Measuring Instruments
70. Which instrument measures atmospheric pressure? – Barometer
71. What is the SI unit of pressure? – Pascal (Pa)
72. Which instrument measures gas pressure? – Manometer
73. Which instrument measures blood pressure? – Sphygmomanometer
74. Which instrument measures humidity? – Hygrometer
75. Which instrument measures wind speed? – Anemometer
76. Which instrument measures altitude? – Altimeter
77. Which device measures the speed of a vehicle? – Speedometer
Gravity, Space & Planets
78. Which force keeps planets in orbit around the Sun? – Gravitational force
79. What is the unit of the gravitational constant (G)? – N·m²/kg²
80. Which scientist is associated with the laws of planetary motion? – Johannes Kepler
81. Who first proposed the heliocentric theory? – Nicolaus Copernicus
82. Which planet is known as the "morning star"? – Venus
83. Which is the largest planet, with the strongest gravitational pull and magnetic field in the solar system? – Jupiter
84. Which is the only planet that rotates on its side? – Uranus
Scientists & Discoveries
85. Who is regarded as the father of modern physics? – Albert Einstein
86. Who developed the theory of relativity? – Albert Einstein
87. Who is regarded as the father of nuclear physics? – Ernest Rutherford
88. Which scientist discovered the proton? – Ernest Rutherford
89. Which scientist discovered the electron? – J. J. Thomson
90. Which scientist discovered the neutron? – James Chadwick
91. Which scientist discovered X-rays? – Wilhelm Röntgen
92. Which scientist discovered radioactivity? – Henri Becquerel
93. Which scientist pioneered quantum theory? – Max Planck
94. Who is credited with developing the first commercially practical electric light bulb? – Thomas Edison
95. Who invented the telephone? – Alexander Graham Bell
96. Who greatly improved the efficiency of the steam engine, helping drive the Industrial Revolution? – James Watt
Miscellaneous
97. What is the chemical formula of water? – H₂O
98. What is the SI unit of density? – kg/m³
99. What is the SI unit of frequency? – Hertz (Hz)
100. What is the SI unit of angular frequency? – rad/s
101. What is the SI unit of luminous intensity? – Candela (cd)
102. What is the SI unit of radiation dose? – Gray (Gy)
103. What is the unit of Planck's constant? – Joule second (J·s)
104. Which principle explains the buoyant force on an object in a fluid? – Archimedes' Principle
105. Which is the hardest known natural material? – Diamond
