**Quantum Theory MCQs** are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important **Quantum Theory MCQs** for Preparation.

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**Quantum Theory Online MCQs with Answers**

Which principle states that the exact position and momentum of a particle cannot both be precisely determined simultaneously?

a) Heisenberg’s uncertainty principle

b) Schrödinger’s equation

c) Planck’s principle

d) Bohr’s model

Which of the following is a fundamental property of a quantum particle?

a) Mass

b) Charge

c) Spin

d) All of the above

The wave-particle duality of light was first proposed by:

a) Max Planck

b) Albert Einstein

c) Louis de Broglie

d) Erwin Schrödinger

The mathematical equation that describes the behavior of quantum particles is known as:

a) Heisenberg’s equation

b) Schrödinger’s equation

c) Planck’s equation

d) Einstein’s equation

The discrete energy levels of an atom are explained by:

a) Bohr’s model

b) Schrödinger’s equation

c) Planck’s principle

d) Heisenberg’s uncertainty principle

Which of the following particles is NOT a fermion?

a) Electron

b) Proton

c) Neutron

d) Photon

The process of a quantum particle passing through a potential barrier that it classically cannot overcome is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The property of a quantum system that allows two particles to be instantaneously connected regardless of the distance between them is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The principle that states that the total probability of all possible outcomes of a quantum measurement must equal 1 is known as:

a) Conservation of probability

b) Conservation of energy

c) Conservation of momentum

d) Conservation of mass

The smallest indivisible unit of electromagnetic radiation is called:

a) An electron

b) A proton

c) A photon

d) A neutron

The quantized energy levels of a bound particle in a box are called:

a) Orbitals

b) Eigenstates

c) Wavefunctions

d) Harmonic oscillators

The principle that states that no two identical fermions can occupy the same quantum state simultaneously is known as:

a) The Pauli exclusion principle

b) The Aufbau principle

c) The Hund’s rule

d) The Bohr’s principle

Which of the following phenomena is explained by the wave-particle duality of quantum particles?

a) Interference

b) Diffraction

c) Polarization

d) All of the above

The concept in quantum mechanics that describes the simultaneous existence of multiple states or positions of a particle is called:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The property of a quantum system that allows it to be in multiple states or positions at the same time is known as:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The concept in quantum mechanics that describes the correlation between the properties of entangled particles, regardless of the distance between them, is called:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The process in which a quantum particle “jumps” discontinuously from one energy level to another is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum leap

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is called:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

The branch of quantum mechanics that deals with the statistical behavior of large ensembles of quantum particles is called:

a) Quantum electrodynamics

b) Quantum chromodynamics

c) Quantum field theory

d) Quantum statistical mechanics

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is known as:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

The concept in quantum mechanics that describes the uncertainty in the position and momentum of a particle is known as:

a) Heisenberg’s uncertainty principle

b) Schrödinger’s equation

c) Planck’s principle

d) Bohr’s model

The phenomenon in which a particle passes through a barrier that classically it should not be able to pass through is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The concept in quantum mechanics that describes the instantaneous connection between entangled particles, regardless of the distance between them, is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The mathematical equation that describes the behavior of quantum particles is known as:

a) Heisenberg’s equation

b) Schrödinger’s equation

c) Planck’s equation

d) Einstein’s equation

Which of the following statements is true about quantum mechanics?

a) It is a theory that describes the behavior of macroscopic objects.

b) It is a deterministic theory that can precisely predict the outcome of any measurement.

c) It is a probabilistic theory that provides statistical predictions for the behavior of microscopic particles.

d) It is a classical theory that is based on Newtonian mechanics.

The concept in quantum mechanics that describes the simultaneous existence of multiple states or positions of a particle is called:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The principle that states that the total probability of all possible outcomes of a quantum measurement must equal 1 is known as:

a) Conservation of probability

b) Conservation of energy

c) Conservation of momentum

d) Conservation of mass

The smallest indivisible unit of electromagnetic radiation is called:

a) An electron

b) A proton

c) A photon

d) A neutron

The quantized energy levels of a bound particle in a box are called:

a) Orbitals

b) Eigenstates

c) Wavefunctions

d) Harmonic oscillators

Which of the following particles is NOT a fermion?

a) Electron

b) Proton

c) Neutron

d) Photon

The concept in quantum mechanics that describes the correlation between the properties of entangled particles, regardless of the distance between them, is called:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The process in which a quantum particle “jumps” discontinuously from one energy level to another is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum leap

The principle that states that no two identical fermions can occupy the same quantum state simultaneously is known as:

a) The Pauli exclusion principle

b) The Aufbau principle

c) The Hund’s rule

d) The Bohr’s principle

The branch of quantum mechanics that deals with the statistical behavior of large ensembles of quantum particles is called:

a) Quantum electrodynamics

b) Quantum chromodynamics

c) Quantum field theory

d) Quantum statistical mechanics

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is known as:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

Which of the following phenomena is explained by the wave-particle duality of quantum particles?

a) Interference

b) Diffraction

c) Polarization

d) All of the above

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is called:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

The principle that states that the exact position and momentum of a particle cannot both be precisely determined simultaneously is known as:

a) Heisenberg’s uncertainty principle

b) Schrödinger’s equation

c) Planck’s principle

d) Bohr’s model

The phenomenon in which a particle passes through a barrier that classically it should not be able to pass through is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The concept in quantum mechanics that describes the instantaneous connection between entangled particles, regardless of the distance between them, is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The principle that states that the total probability of all possible outcomes of a quantum measurement must equal 1 is known as:

a) Conservation of probability

b) Conservation of energy

c) Conservation of momentum

d) Conservation of mass

The smallest indivisible unit of electromagnetic radiation is called:

a) An electron

b) A proton

c) A photon

d) A neutron

The quantized energy levels of a bound particle in a box are called:

a) Orbitals

b) Eigenstates

c) Wavefunctions

d) Harmonic oscillators

Which of the following particles is NOT a fermion?

a) Electron

b) Proton

c) Neutron

d) Photon

The concept in quantum mechanics that describes the correlation between the properties of entangled particles, regardless of the distance between them, is called:

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

The process in which a quantum particle “jumps” discontinuously from one energy level to another is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum leap

The principle that states that no two identical fermions can occupy the same quantum state simultaneously is known as:

a) The Pauli exclusion principle

b) The Aufbau principle

c) The Hund’s rule

d) The Bohr’s principle

The branch of quantum mechanics that deals with the statistical behavior of large ensembles of quantum particles is called:

a) Quantum electrodynamics

b) Quantum chromodynamics

c) Quantum field theory

d) Quantum statistical mechanics

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is known as:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

Which of the following phenomena is explained by the wave-particle duality of quantum particles?

a) Interference

b) Diffraction

c) Polarization

d) All of the above

The concept in quantum mechanics that describes the behavior of particles as waves and waves as particles is called:

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

The principle that states that the exact position and momentum of a particle cannot both be precisely determined simultaneously is known as:

a) Heisenberg’s uncertainty principle

b) Schrödinger’s equation

c) Planck’s principle

d) Bohr’s model

The phenomenon in which a particle passes through a barrier that classically it should not be able to pass through is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

The concept in quantum mechanics that describes the instantaneous connection between entangled particles, regardless of the distance between them, is called:

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

a) Conservation of probability

b) Conservation of energy

c) Conservation of momentum

d) Conservation of mass

a) An electron

b) A proton

c) A photon

d) A neutron

a) Orbitals

b) Eigenstates

c) Wavefunctions

d) Harmonic oscillators

Which of the following particles is NOT a fermion?

a) Electron

b) Proton

c) Neutron

d) Photon

a) Superposition

b) Entanglement

c) Tunneling

d) Reflection

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum leap

a) The Pauli exclusion principle

b) The Aufbau principle

c) The Hund’s rule

d) The Bohr’s principle

a) Quantum electrodynamics

b) Quantum chromodynamics

c) Quantum field theory

d) Quantum statistical mechanics

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

a) Interference

b) Diffraction

c) Polarization

d) All of the above

a) Wave-particle duality

b) Superposition

c) Entanglement

d) Tunneling

The principle that states that the exact position and momentum of a particle cannot both be precisely determined simultaneously is known as:

a) Heisenberg’s uncertainty principle

b) Schrödinger’s equation

c) Planck’s principle

d) Bohr’s model

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

a) Quantum tunneling

b) Quantum entanglement

c) Quantum superposition

d) Quantum scattering

a) Conservation of probability

b) Conservation of energy

c) Conservation of momentum

d) Conservation of mass

a) An electron

b) A proton

c) A photon

d) A neutron