100 Physics Quiz Questions & Answers 2026

Classical Mechanics — 25 Questions

1. What is Newton's First Law? (An object stays at rest or in motion unless acted on by a net force)
2. What is Newton's Second Law? (Force = Mass × Acceleration — F = ma)
3. What is Newton's Third Law? (For every action there is an equal and opposite reaction)
4. What is velocity? (Speed in a specific direction — a vector quantity)
5. What is the SI unit of mass? (Kilogram)
6. What is the SI unit of length? (Metre)
7. What is centripetal force? (Force directed toward the center of a circular path)
8. What is torque? (Rotational force — force × distance from pivot)
9. What is momentum? (Mass × Velocity — p = mv)
10. What is the unit of momentum? (kg·m/s)
11. What is elastic potential energy? (Energy stored in a stretched or compressed spring)
12. What is the formula for gravitational potential energy? (PE = mgh — mass × gravity × height)
13. What is acceleration due to gravity on Earth's surface? (9.8 m/s² or ~10 m/s²)
14. What is inertia? (Resistance to change in motion — related to mass)
15. What is simple harmonic motion? (Oscillating motion where restoring force is proportional to displacement)
16. What is the formula for kinetic energy? (KE = ½mv²)
17. What is a scalar quantity? (Has magnitude only — e.g., speed, temperature, mass)
18. What is a vector quantity? (Has both magnitude and direction — e.g., velocity, force)
19. What does Hooke's Law state? (F = -kx — spring force is proportional to extension)
20. What is the principle of conservation of momentum? (Total momentum of a closed system remains constant)
21. What is terminal velocity? (Maximum velocity when drag equals gravitational force)
22. What is projectile motion? (Motion under gravity at an angle — parabolic path)
23. Who first described universal gravitation? (Isaac Newton — Principia Mathematica, 1687)
24. What is the period of a pendulum dependent on? (Length of pendulum and gravity — not mass)
25. What is the formula for power? (P = W/t — Power = Work / Time)

Electricity & Magnetism — 20 Questions

1. What is electric charge measured in? (Coulombs)
2. What is voltage? (Electrical potential difference — measured in Volts)
3. What is a semiconductor? (Material with conductivity between a conductor and insulator)
4. What is a diode? (Electronic component that allows current in one direction only)
5. What is electromagnetic induction? (Generation of electric current by changing magnetic flux)
6. Who discovered electromagnetic induction? (Michael Faraday, 1831)
7. What is the difference between AC and DC? (AC alternates direction; DC flows in one direction)
8. What is a capacitor? (Device that stores electrical energy in an electric field)
9. What is an ammeter used for? (Measuring electric current)
10. What is electrical resistance? (Opposition to electric current flow — measured in Ohms)
11. What are the two types of electric charge? (Positive and Negative)
12. What is superconductivity? (Zero electrical resistance at very low temperatures)
13. What is a transformer? (Device that changes voltage using electromagnetic induction)
14. What is the formula for electrical power? (P = VI — Power = Voltage × Current)
15. What is a magnetic field? (Region around a magnet where magnetic forces act)
16. Who invented the battery? (Alessandro Volta, 1800)
17. What is the Earth's magnetic field called? (Geomagnetic field / magnetosphere)
18. What is static electricity? (Build-up of electric charge on a surface)
19. What material is best for conducting electricity? (Silver is best; copper is most used)
20. What is the formula for Ohm's Law? (V = IR)

Thermodynamics & Modern Physics — 20 Questions

1. What are the four laws of thermodynamics? (Zeroth: thermal equilibrium; First: energy conservation; Second: entropy increases; Third: absolute zero unreachable)
2. What is entropy? (Measure of disorder or randomness in a system)
3. What is the Kelvin scale? (Absolute temperature scale starting at absolute zero)
4. What is conduction? (Heat transfer through direct contact)
5. What is convection? (Heat transfer through fluid movement)
6. What is radiation? (Heat transfer through electromagnetic waves)
7. Who proposed quantum theory? (Max Planck, 1900)
8. What is a photon? (A particle/quantum of light)
9. What is the photoelectric effect? (Emission of electrons from a metal when light shines on it)
10. Who explained the photoelectric effect? (Albert Einstein — for which he won the Nobel Prize in 1921)
11. What is Schrödinger's Cat? (Thought experiment illustrating quantum superposition — cat is both alive and dead until observed)
12. What is antimatter? (Matter composed of antiparticles — opposite charge to regular matter)
13. What is a quark? (Elementary particle that makes up protons and neutrons)
14. What is the Higgs Boson? (Particle that gives other particles mass — confirmed at CERN in 2012)
15. What is nuclear fusion? (Combining light atomic nuclei to release energy — powers the Sun)
16. What is radioactive decay? (Spontaneous emission of particles from an unstable nucleus)
17. What are the three types of radioactive decay? (Alpha, Beta, and Gamma)
18. What is the strong nuclear force? (Force holding protons and neutrons together in the nucleus)
19. What did Einstein's Theory of Special Relativity introduce? (Time dilation, length contraction, and mass-energy equivalence at near-light speeds)
20. What is a wormhole theoretically? (A hypothetical tunnel connecting two separate points in spacetime)