Physics
Matter and Quantum Mechanics
1,427 Questions
This topic addresses core concepts in quantum mechanics, statistical thermodynamics, and states of matter. Questions cover quantum field theory, particle behavior, and statistical distributions. This material is essential for physics competitive exams.
Statistical ensemblesQuantum field theoryParticle physicsStates of matterWave particle duality
Matter and Quantum Mechanics Questions
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(a), (b) and (c)
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(a) and (c)
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(b) and (c)
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(c) only
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(a) only
A
Correct answer
Explanation
This is the correct answer. All the statements are correct.
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small celestial bodies moving in space at great speed
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small particles constituting blood
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the basic building blocks of protons, neutrons and electrons
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Meteorological phenomena which happen close to poles
C
Correct answer
Explanation
Quarks and Leptons are elementary particles in the Standard Model of particle physics. Quarks combine to form protons and neutrons, while electrons (a type of lepton) orbit atomic nuclei. They are not celestial bodies, blood constituents, or meteorological phenomena.
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polaritons
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fermion
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heavy ion
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polaron
C
Correct answer
Explanation
Heavy ion refers to an ionized atom which is usually heavier than helium. Heavy-ion physics is devoted to the study of extremely hot nuclear matter and the collective effects appearing in such systems, differing from particle physics, which studies the interactions between elementary particles.
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van der Waals force
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london dispersion forces
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intramolecular force
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intermolecular forces
B
Correct answer
Explanation
London dispersion force is a weak intermolecular force arising from the quantum induced instantaneous polarization multipoles in molecules. They can act between molecules without permanent multipole moments.These are exhibited by nonpolar molecules because of the correlated movements of the electrons in interacting molecules.
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revolution, radical
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rotation, intrinsic
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motion, intangible
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acceleration, hypothetical
B
Correct answer
Explanation
Rotation is an intrinsic property of particles, meaning it's inherent and essential to their nature. Unlike a top that needs winding, particles naturally rotate - it's built into their fundamental characteristics.
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Nuclear matter
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Quark matter
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Strange matter
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Rydberg matter
C
Correct answer
Explanation
Strange matter is a particular form of quark matter, usually thought of as a liquid of up, down, and strange quarks. It is to be contrasted with nuclear matter, which is a liquid of neutrons and protons (which themselves are built out of up and down quarks), and with non-strange quark matter, which is a quark liquid containing only up and down quarks.
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quark degeneracy
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neutron degeneracy
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proton degeneracy
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electron degeneracy
D
Correct answer
Explanation
In ordinary gas, most of the electron energy levels (n-spheres) are unfilled and the electrons are free to move . As particle density is increased electrons progressively, fill the lower energy states and additional electrons are forced to occupy states of higher energy. Degenerate gases strongly resist further compression because the electrons cannot move to lower energy levels, which are already filled. The Pauli Exclusion Principle causes this.
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excited state
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quantum state
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ground state
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stationary state
C
Correct answer
Explanation
The ground state of a quantum mechanical system is its lowest-energy state; the energy of the ground state is known as the zero-point energy of the system. An excited state is any state with energy greater than the ground state. The ground state of a quantum field theory is usually called the vacuum state or the vacuum.
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Fifth state of matter
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Fourth state of matter
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Third state of matter
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None of these
B
Correct answer
Explanation
Plasma is considered the fourth state of matter, after solid, liquid, and gas. It consists of ionized gas with free electrons and ions, found in stars, lightning, and neon signs. Plasma is unique in responding to electromagnetic fields.
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distribution of agricultural produce equally
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stastistical distribution of food among the poor classes
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behaviour of tigers in nature
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electronic configuration in atom
D
Correct answer
Explanation
electron configuration in atom
The Aufbau Principle states that:
The orbitals of lower energy are filled in first with the electrons and only then the orbitals of high energy are filled.
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atom
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molecule
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neutron
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isotope
B
Correct answer
Explanation
A molecule is the smallest particle of a substance that can exist independently while retaining all the chemical properties of the original substance. An atom is too small to retain the substance's properties - it only retains elemental properties. Neutrons are subatomic particles, and isotopes are variants of elements.
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matter
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energy
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moment
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material
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Electron
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Proton
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Neutron
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Photon
D
Correct answer
Explanation
A photon is a quantum of light - a discrete packet of electromagnetic energy. Electrons, protons, and neutrons are subatomic particles with mass, while photons are massless energy packets.
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Raman Effect
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Newton Effect
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Archimedes Effect
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Pascal Effect
A
Correct answer
Explanation
The Raman Effect, discovered by Indian physicist C.V. Raman in 1928, is used to study molecular energy levels and molecular vibrations. When light interacts with molecules, most of it is elastically scattered (Rayleigh scattering), but a small fraction is inelastically scattered (Raman scattering) with shifted energy levels corresponding to molecular vibrational modes. This effect provides valuable information about molecular structure, bonding, and energy states.
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A wave requires a material medium while a particle does not require a medium for its propagation.
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A particle transports matter but a wave does not.
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A particle is visible but a wave is not visible.
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All the above