⚛️ Physics (1–35)

1. What is SI unit of force?
   👉 Newton
2. What is SI unit of work?
   👉 Joule
3. What is SI unit of power?
   👉 Watt
4. What is velocity?
   👉 Speed with direction
5. What is acceleration?
   👉 Rate of change of velocity
6. Who gave laws of motion?
   👉 Isaac Newton
7. What is gravity?
   👉 Force of attraction
8. What is SI unit of pressure?
   👉 Pascal
9. What is energy?
   👉 Capacity to do work
10. Types of energy?
    👉 Kinetic & Potential
11. What is light?
    👉 Form of energy
12. Speed of light?
    👉 3 × 10⁸ m/s
13. What is sound?
    👉 Mechanical wave
14. What is frequency?
    👉 Number of vibrations
15. SI unit of frequency?
    👉 Hertz
16. What is echo?
    👉 Reflection of sound
17. What is reflection?
    👉 Bouncing of light
18. What is refraction?
    👉 Bending of light
19. What is lens?
    👉 Optical device
20. Types of lenses?
    👉 Concave & Convex
21. What is mirror?
    👉 Reflecting surface
22. Types of mirrors?
    👉 Plane, concave, convex
23. What is electricity?
    👉 Flow of electrons
24. SI unit of current?
    👉 Ampere
25. Who discovered electricity?
    👉 Benjamin Franklin
26. What is voltage?
    👉 Potential difference
27. SI unit of resistance?
    👉 Ohm
28. What is magnet?
    👉 Material with magnetic field
29. What is electromagnetism?
    👉 Electricity + magnetism
30. What is heat?
    👉 Form of energy
31. What is temperature?
    👉 Measure of heat
32. SI unit of temperature?
    👉 Kelvin
33. What is conduction?
    👉 Heat transfer
34. What is convection?
    👉 Heat transfer by fluid
35. What is radiation?
    👉 Heat transfer without medium

🧪 Chemistry (36–70)

36. What is atom?
    👉 Smallest unit of matter
37. Who discovered atom concept?
    👉 John Dalton
38. What is molecule?
    👉 Group of atoms
39. What is element?
    👉 Pure substance
40. What is compound?
    👉 Combination of elements
41. What is mixture?
    👉 Physical combination
42. What is periodic table?
    👉 Arrangement of elements
43. Who created periodic table?
    👉 Dmitri Mendeleev
44. What is atomic number?
    👉 Number of protons
45. What is mass number?
    👉 Protons + neutrons
46. What is valency?
    👉 Combining capacity
47. What is pH scale?
    👉 Measure of acidity
48. pH of neutral substance?
    👉 7
49. What is acid?
    👉 Proton donor
50. What is base?
    👉 Proton acceptor
51. What is salt?
    👉 Acid + base product
52. What is oxidation?
    👉 Loss of electrons
53. What is reduction?
    👉 Gain of electrons
54. What is catalyst?
    👉 Speeds reaction
55. What is chemical reaction?
    👉 Change in substance
56. What is exothermic reaction?
    👉 Releases heat
57. What is endothermic reaction?
    👉 Absorbs heat
58. What is metal?
    👉 Conducts heat & electricity
59. What is non-metal?
    👉 Poor conductor
60. What is alloy?
    👉 Mixture of metals
61. Example of alloy?
    👉 Brass
62. What is corrosion?
    👉 Rusting process
63. What is rust?
    👉 Iron oxide
64. What is electrolysis?
    👉 Chemical decomposition
65. What is hydrocarbon?
    👉 Carbon + hydrogen
66. What is polymer?
    👉 Large molecules
67. What is soap?
    👉 Cleaning agent
68. What is detergent?
    👉 Synthetic cleaner
69. What is gas law?
    👉 Behavior of gases
70. What is Avogadro’s law?
    👉 Equal volumes

🧬 Biology (71–100)

71. What is cell?
    👉 Basic unit of life
72. Who discovered cell?
    👉 Robert Hooke
73. What is DNA?
    👉 Genetic material
74. What is gene?
    👉 Unit of heredity
75. What is tissue?
    👉 Group of cells
76. What is organ?
    👉 Group of tissues
77. What is system?
    👉 Group of organs
78. What is photosynthesis?
    👉 Food making process
79. Which gas is used in photosynthesis?
    👉 Carbon dioxide
80. Which gas is released?
    👉 Oxygen
81. What is respiration?
    👉 Energy release
82. What is digestion?
    👉 Breaking food
83. What is blood?
    👉 Fluid tissue
84. What are RBCs?
    👉 Red blood cells
85. What are WBCs?
    👉 White blood cells
86. What is hemoglobin?
    👉 Oxygen carrier
87. What is heart?
    👉 Pumping organ
88. How many chambers in human heart?
    👉 4
89. What is brain?
    👉 Control center
90. What is neuron?
    👉 Nerve cell
91. What is hormone?
    👉 Chemical messenger
92. What is insulin?
    👉 Controls sugar
93. What is immunity?
    👉 Disease resistance
94. What is vaccine?
    👉 Disease prevention
95. What is bacteria?
    👉 Microorganism
96. What is virus?
    👉 Infectious agent
97. What is fungus?
    👉 Type of organism
98. What is ecosystem?
    👉 Living + non-living
99. What is food chain?
    👉 Energy transfer
100. What is biodiversity?
     👉 Variety of life