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ScienceHard

Advanced Sciences

Einstein published special relativity in 1905 and general relativity in 1915. Planck's constant (h ≈ 6.626 × 10⁻³⁴ J·s) underpins quantum mechanics. Test 10 demanding questions for true science fans.

10

Questions

2

Minutes

Tip: Use keys 1-4 to answer quickly

The 10 quiz questions

Question 1 : What is a photon?

Possible answers:

  • A particle of light
  • An atom of light
  • A luminous electron
  • A sound wave

Explanation: The photon is the elementary particle that carries light and all electromagnetic radiation.

Question 2 : What is the order of magnitude of Avogadro's number, which defines the quantity of entities in a mole?

Possible answers:

  • 6 × 10⁸
  • 6 × 10¹⁵
  • 6 × 10²³
  • 6 × 10³⁴

Explanation: Avogadro's number is approximately 6.022 × 10²³. It represents the number of atoms, molecules, or ions in one mole of substance. It is a fundamental bridge between the atomic and macroscopic scales.

Question 3 : Which quantum mechanics principle states that one cannot simultaneously know a particle's position and velocity with absolute precision?

Possible answers:

  • Pauli's exclusion principle
  • Heisenberg's uncertainty principle
  • The superposition principle
  • Bohr's complementarity principle

Explanation: Heisenberg's uncertainty principle (1927) sets a fundamental limit: the more precisely a particle's position is measured, the less precisely its momentum is known, and vice versa. This is not a technical limitation but an intrinsic property of nature.

Question 4 : Which fundamental constant, denoted h, relates a photon's energy to its frequency?

Possible answers:

  • The gravitational constant
  • Boltzmann's constant
  • Planck's constant
  • Avogadro's constant

Explanation: Planck's constant (h ≈ 6.626 × 10⁻³⁴ J·s) is at the heart of quantum mechanics. It appears in the relation E = hν, where E is energy and ν is the radiation frequency.

Question 5 : What is the antiparticle of the electron called, discovered by Carl Anderson in 1932?

Possible answers:

  • The graviton
  • The neutrino
  • The muon
  • The positron

Explanation: The positron is the antiparticle of the electron: same mass but positive charge. Its discovery confirmed Dirac's theory of antimatter and paved the way for PET (positron emission tomography).

Question 6 : What is the chemical symbol for gold?

Possible answers:

  • Ag
  • Au
  • Go
  • Or

Explanation: The symbol Au comes from the Latin "aurum". Gold (atomic number 79) is a precious metal known since antiquity for its resistance to corrosion.

Question 7 : Which gas is most abundant in Earth's atmosphere?

Possible answers:

  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • Hydrogen

Explanation: Nitrogen (N2) makes up about 78% of the atmosphere, compared to 21% for oxygen.

Question 8 : What is the unit of measurement for electrical resistance?

Possible answers:

  • Watt
  • Ampere
  • Volt
  • Ohm

Explanation: The ohm (Ω) is named after the German physicist Georg Ohm.

Question 9 : 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 10 : Which particle, predicted in 1964 and observed in 2012 at CERN, gives mass to other elementary particles?

Possible answers:

  • Top quark
  • Higgs boson
  • Neutrino
  • Muon

Explanation: The Higgs boson, predicted by Peter Higgs and François Englert in 1964, was detected in 2012 at CERN's LHC. Its discovery earned the 2013 Nobel Prize in Physics for its theorists.

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