Physics related GK questions and answers

 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

Chemistry related GK questions and answers

 Chemistry 

Chemistry GK – Questions & Answer 

Chemistry is the science that studies matter, elements, compounds, and chemical reactions. These basic Chemistry GK questions help improve scientific knowledge and are useful for students, quizzes, and competitive exams.

Practice questions 1-25

Chemistry GK – Questions & Answers 

Questions 1–25

1. Who is known as the Father of Modern Chemistry? – Antoine Lavoisier

2. What is the lightest element in the periodic table? – Hydrogen

3. What is the chemical symbol of gold? – Au

4. Which gas is essential for respiration? – Oxygen

5. The atomic number of carbon is? – 6

6. Which acid is found in lemon? – Citric Acid

7. What is the common name of sodium chloride? – Common Salt

8. What is the pH value of pure water? – 7 (Neutral)

9. Which gas is known as laughing gas? – Nitrous Oxide (N₂O)

10. What is the chemical symbol of iron? – Fe

11. Which metal is liquid at room temperature? – Mercury

12. Which element is necessary for the formation of hemoglobin? – Iron

13. What is the hardest natural substance on Earth? – Diamond

14. Which gas is used in fire extinguishers? – Carbon Dioxide (CO₂)

15. What is the chemical symbol for lead? – Pb

16. Who proposed the atomic theory? – John Dalton

17. Which element has the highest electronegativity? – Fluorine

18. What is the chemical name of washing soda? – Sodium Carbonate (Na₂CO₃)

19. What is the atomic number of oxygen? – 8

20. Which element is used in pencils? – Carbon (Graphite)

21. Which element is used in making thermometers? – Mercury

22. The noble gases are found in which group of the periodic table? – Group 18

23. Which gas turns limewater milky? – Carbon Dioxide

24. Which is the most abundant element in Earth's crust? – Oxygen

25. What is the main component of natural gas? – Methane (CH₄)

 Questions 26–45

26. Which gas is used in balloons? – Helium

27. What is the chemical symbol of silver? – Ag

28. Which acid is present in vinegar? – Acetic Acid

29. What is the chemical formula of ozone? – O₃

30. Which gas is produced during photosynthesis? – Oxygen

31. Which metal is the best conductor of electricity? – Silver

32. Which chemical is called quicklime? – Calcium Oxide (CaO)

33. What is the chemical symbol of potassium? – K

34. Which gas is known as marsh gas? – Methane (CH₄)

35. Which inert gas is used to fill fluorescent lamps (along with mercury vapor)? – Argon

36. Which acid is used in car batteries? – Sulfuric Acid

37. What is the chemical symbol of sodium? – Na

38. Which gas makes up about 78% of Earth's atmosphere? – Nitrogen

39. What is the chemical symbol of copper? – Cu

40. Which metal is used for making aircraft bodies? – Aluminium

41. Which is the heaviest naturally occurring element? – Uranium

42. Which element has the chemical symbol Zn? – Zinc

43. Which element is used in nuclear reactors as fuel? – Uranium

44. Which acid is called the "King of Chemicals"? – Sulfuric Acid

45. Which element is used in making semiconductor devices? – Silicon

Questions 46–65

46. What is the chemical symbol of calcium? – Ca

47. Which element is called the "building block of life"? – Carbon

48. Which gas is commonly known as "dry ice" in its solid form? – Carbon Dioxide

49. What is the atomic number of hydrogen? – 1

50. Which gas mixture is known as "water gas"? – Carbon monoxide + Hydrogen

51. What is the atomic number of helium? – 2

52. What is the chemical formula of ammonia? – NH₃

53. Which gas is used for welding? – Acetylene

54. Which element has the symbol Sn? – Tin

55. What is the molecular formula of glucose? – C₆H₁₂O₆

56. Which gas is used to preserve food items? – Nitrogen

57. Which metal is sometimes called the "metal of the future" for its strength and low weight? – Titanium

58. Which element is liquid at room temperature, other than mercury? – Bromine

59. What is the chemical formula of sulfuric acid? – H₂SO₄

60. Which gas gives soda water its fizz? – Carbon Dioxide

61. Which element has the chemical symbol Mg? – Magnesium

62. Which element has the atomic number 79? – Gold

63. What is the chemical formula of table sugar (sucrose)? – C₁₂H₂₂O₁₁

64. Which gas mixture is known as "coal gas"? – Methane, Hydrogen, and Carbon Monoxide

65. Which is the lightest metal? – Lithium

 Questions 66–85

66. Which element has the atomic number 26? – Iron (Fe)

67. What is the chemical formula of baking soda? – NaHCO₃

68. Which element is called quicksilver? – Mercury

69. What is the chemical symbol of phosphorus? – P

70. Which gas is used in the manufacture of fertilizers? – Ammonia

71. What is the atomic number of neon? – 10

72. Which metal is used for galvanization? – Zinc

73. Which gas is used in soda water? – Carbon Dioxide

74. Which element has the atomic number 17? – Chlorine

75. Which gas is used for ripening of fruits? – Ethylene

76. Which gases combine in the Haber process to produce ammonia? – Nitrogen and Hydrogen

77. Which gas from incomplete combustion is highly poisonous? – Carbon Monoxide (CO)

78. Which gas is used in fuel cells as a clean energy source? – Hydrogen

79. Which is the most abundant gas in the Sun? – Hydrogen

80. Which chemical is commonly used as a tear gas? – Chloropicrin

81. What is the chemical symbol of uranium? – U

82. Which is the lightest noble gas? – Helium

83. Which alloy is used in making railway tracks? – Steel (Iron + Carbon)

84. Which element has the atomic number 92? – Uranium

85. Which element has the atomic number 82? – Lead

 Questions 86–105

86. Which element is sometimes called the "king of metals"? – Gold

87. Which element is used in the vulcanization of rubber? – Sulphur

88. Which metal is the most malleable (can be beaten into the thinnest sheets)? – Gold

89. What is the atomic number of nitrogen? – 7

90. Which acid is found in tamarind? – Tartaric Acid

91. Which form of carbon is a good conductor of electricity? – Graphite

92. What is the chemical symbol of tungsten? – W

93. Which gas is released when zinc reacts with hydrochloric acid? – Hydrogen

94. Which element is widely used in making LEDs and semiconductors? – Gallium

95. Which gas is responsible for acid rain? – Sulfur Dioxide (SO₂)

96. Which mineral compound is known as "fool's gold"? – Iron Pyrite

97. Which acid is present in curd/yogurt? – Lactic Acid

98. Which metals are added to iron to make stainless steel? – Chromium and Nickel

99. Which element currently has the highest atomic number in the periodic table (as of 2025)? – Oganesson (Og, 118)

100. Which chemical is commonly used to purify drinking water? – Chlorine

101. Which metal is theoretically the most reactive, though too unstable/rare to be tested directly? – Francium (Cesium is often used as the practical "most reactive" answer in exams)

102. Which is the most reactive non-metal? – Fluorine

103. Which element is essential for the formation of bones and teeth? – Calcium

104. Which metal is widely used in electrical wiring due to its high conductivity? – Copper

105. Which element is used as fuel in nuclear power plants? – Uranium