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Physics MCQs

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Which type of electromagnetic wave has the highest frequency and energy in the spectrum?

  • A Radio waves
  • B X-rays
  • C Gamma rays
  • D Ultraviolet
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Correct Answer: Option C — Gamma rays
Explanation: Gamma rays have the highest frequency and energy in the electromagnetic spectrum produced by nuclear reactions and radioactive decay and can only be blocked by thick lead or concrete.
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122
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Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

  • A Heisenberg Uncertainty Principle
  • B Superposition Principle
  • C Aufbau Principle
  • D Pauli Exclusion Principle
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Correct Answer: Option D — Pauli Exclusion Principle
Explanation: The Pauli Exclusion Principle states that no two electrons in an atom can have identical sets of all four quantum numbers meaning each orbital can hold at most two electrons with opposite spins.
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123
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What is the SI unit of capacitance?

  • A Henry
  • B Farad
  • C Tesla
  • D Ohm
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Correct Answer: Option B — Farad
Explanation: The Farad is the SI unit of capacitance named after Michael Faraday defined as the capacitance of a capacitor that stores one coulomb of charge at one volt potential difference.
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124
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Which law explains why objects float or sink in a fluid?

  • A Newton's Law
  • B Archimedes' Principle
  • C Pascal's Law
  • D Boyle's Law
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Correct Answer: Option B — Archimedes' Principle
Explanation: Archimedes' Principle states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of fluid displaced. Objects float when this buoyant force equals or exceeds their weight.
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125
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Which scale of temperature is used in thermodynamic calculations and starts at absolute zero?

  • A Kelvin
  • B Celsius
  • C Fahrenheit
  • D Rankine
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Correct Answer: Option A — Kelvin
Explanation: The Kelvin scale is the SI thermodynamic temperature scale starting at absolute zero and used in all scientific thermodynamic calculations because it has no negative values.
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126
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Which of the following best describes nuclear fission?

  • A Combining light nuclei to form a heavier nucleus
  • B Emission of alpha particles
  • C Splitting of a heavy nucleus into lighter nuclei
  • D Absorption of neutrons without splitting
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Correct Answer: Option C — Splitting of a heavy nucleus into lighter nuclei
Explanation: Nuclear fission is the process where a heavy atomic nucleus splits into two or more lighter nuclei, releasing a substantial amount of energy. This process powers nuclear reactors and was famously used in atomic bombs during World War II.
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127
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Which type of radiation consists of helium nuclei emitted from an unstable nucleus?

  • A Alpha radiation
  • B Beta radiation
  • C Gamma radiation
  • D Neutron radiation
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Correct Answer: Option A — Alpha radiation
Explanation: Alpha radiation consists of particles identical to helium-4 nuclei containing two protons and two neutrons emitted from heavy unstable nuclei during radioactive decay.
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