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Physics: Laws and Discoveries

From 17th-century classical mechanics to particle physics at CERN: fifteen questions on optics, thermodynamics, electromagnetism, relativity and the quantum world. Can you match each law to its field?

15

Questions

2

Minutes

Tip: Use keys 1-4 to answer quickly

The 15 quiz questions

Question 1 : Who formulated the theory of relativity?

Possible answers:

  • Albert Einstein
  • Niels Bohr
  • Max Planck
  • Isaac Newton

Explanation: Albert Einstein published special relativity in 1905 and general relativity in 1915. These theories revolutionized our understanding of space, time, and gravity.

Question 2 : What is the speed of light in a vacuum?

Possible answers:

  • 300,000 km/s
  • 400,000 km/s
  • 500,000 km/s
  • 600,000 km/s

Explanation: Light travels at about 300,000 km/s (299,792,458 m/s exactly) in a vacuum. It is a fundamental constant of the universe, denoted "c".

Question 3 : Which famous Einstein equation relates mass and energy?

Possible answers:

  • PV=nRT
  • E=hν
  • F=ma
  • E=mc²

Explanation: E=mc² is the special relativity equation published by Einstein in 1905. It means that energy (E) equals mass (m) multiplied by the speed of light squared (c²).

Question 4 : Which physicist discovered the laws of universal gravitation?

Possible answers:

  • Galileo
  • Isaac Newton
  • Kepler
  • Copernicus

Explanation: Isaac Newton formulated the law of universal gravitation in 1687 in his "Principia Mathematica," explaining why objects fall and planets orbit the Sun. Legend has it that an apple falling from a tree inspired this revolutionary discovery.

Question 5 : What is the name of the elementary particle responsible for mass?

Possible answers:

  • The graviton
  • The electron
  • The photon
  • The Higgs boson

Explanation: The Higgs boson, discovered in 2012 at CERN, is the particle that gives mass to other elementary particles. Peter Higgs received the Nobel Prize for this prediction.

Question 6 : Which quantum mechanics principle states that one cannot precisely know both the position and velocity of a particle?

Possible answers:

  • Correspondence principle
  • Superposition principle
  • Pauli exclusion principle
  • Heisenberg uncertainty principle

Explanation: Heisenberg's uncertainty principle (1927) establishes a fundamental limit to the precision with which certain pairs of particle properties can be known simultaneously.

Question 7 : Which force keeps electrons in orbit around the atomic nucleus?

Possible answers:

  • Gravitational force
  • Weak nuclear force
  • Electromagnetic force
  • Strong nuclear force

Explanation: The electromagnetic force, attraction between electrons (negative) and protons in the nucleus (positive), keeps electrons bound to the atom.

Question 8 : Which physicist discovered radioactivity with her husband Pierre?

Possible answers:

  • Marie Curie
  • Emmy Noether
  • Irène Joliot-Curie
  • Lise Meitner

Explanation: Marie Curie, with Pierre Curie and Henri Becquerel, discovered radioactivity. She received two Nobel Prizes: Physics (1903) and Chemistry (1911).

Question 9 : Which phenomenon explains why the sky is blue?

Possible answers:

  • Rayleigh scattering
  • Refraction
  • Absorption
  • Reflection

Explanation: Rayleigh scattering explains that blue light, with its short wavelength, is scattered more by the atmosphere than other colors, giving the sky its blue color.

Question 10 : What is the unit of force in the International System?

Possible answers:

  • The Newton
  • The Joule
  • The Watt
  • The Pascal

Explanation: The Newton (N) is the unit of force. One Newton is the force needed to accelerate a 1 kg mass at 1 m/s². It is named after Isaac Newton.

Question 11 : Which scientist formulated the fundamental equations of electromagnetism?

Possible answers:

  • Heinrich Hertz
  • Michael Faraday
  • James Clerk Maxwell
  • Nikola Tesla

Explanation: James Clerk Maxwell unified electricity and magnetism in his famous equations published in the 1860s.

Question 12 : What is the phenomenon called when light changes direction as it passes from one medium to another?

Possible answers:

  • Reflection
  • Dispersion
  • Refraction
  • Diffraction

Explanation: Refraction is the change in direction of light when it passes from one medium to another (e.g., air to water).

Question 13 : Which particle carries the strong force that holds atomic nuclei together?

Possible answers:

  • The gluon
  • The Higgs boson
  • The photon
  • The graviton

Explanation: The gluon is the boson mediating the strong interaction, binding quarks together to form protons and neutrons, and holding these together within the atomic nucleus. Gluons are the most strongly bound particles in the Standard Model.

Question 14 : Which principle states that two identical fermions cannot occupy the same quantum state?

Possible answers:

  • Exclusion principle
  • Uncertainty principle
  • Superposition principle
  • Correspondence principle

Explanation: The Pauli exclusion principle (1925) explains the structure of atomic electron shells and the stability of matter. It applies to fermions (electrons, protons, neutrons), not bosons.

Question 15 : What is the temperature of absolute zero in degrees Celsius?

Possible answers:

  • -459.67°C
  • -273.15°C
  • -100°C
  • 0°C

Explanation: Absolute zero (-273.15°C or 0 Kelvin) is the lowest theoretically possible temperature, where molecular motion ceases.

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