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

Multiple choice

EM energy is composed of small particles called:

  1. Putons

  2. Croton

  3. Protons

  4. Photons
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electromagnetic energy is quantized into discrete packets or particles known as photons. Protons are subatomic particles found in the nucleus of an atom.

Multiple choice bohr's model of atom structure of atom

In which transition one quantum of energy is emitted?

  1. $\displaystyle n=4\rightarrow n=2$
  2. $\displaystyle n=3\rightarrow n=1$
  3. $\displaystyle n=4\rightarrow n=1$

  4. All of them
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In all the three transitions $\displaystyle n=4\rightarrow n=2$, $\displaystyle n=3\rightarrow n=1$ and $\displaystyle n=4\rightarrow n=1$, one quantum of energy is emitted. Whenever an electron jumps from higher energy level to lower energy level, a quantum of energy is emitted.

Multiple choice limitations of bohr model and explanation of bohr's second postulate by matter waves bohr's model atoms atomic nuclei physics

Which of the following option is NOT a correct pairing of physicist and field in which he made significant contributions?

  1. Newton - gravitation

  2. Einstein - relativity

  3. Faraday - electricity and magnetism

  4. Coulomb - quantum mechanics

  5. Bohr - atomic structure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Charles- Augustine de Coulomb was a French physicist known for his work in electrostatics, mainly for developing the Coulomb's law that quantifies the force between two charged particles separated at some distance. 

Multiple choice limitations of bohr model and explanation of bohr's second postulate by matter waves bohr's model atoms atomic nuclei physics

Why are matter waves significant only in the motion of extremely small particles?

  1. Small particles have smaller mass and hence the de Broglie wavelength increases

  2. Small particles are manageable easily

  3. Small particles possess small kinetic energy

  4. Extremely small particles possess small relativistic mass
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\lambda=\cfrac{h}{mv}$

Smaller particles have larger wavelength and more wave like character.

Multiple choice particles of a gas ideal gases physics

Motion of molecule in a substance is concluded by

  1. Using microscopes

  2. Mathematical postulates

  3. Using assumptions

  4. Observations from experiments
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Molecules are too small to be seen by microscope. Motion of molecules can be concluded by observations seen in experiment,such as diffusion of ink particles in water,light scattering experiments etc.

Multiple choice laws of heat transfer heat and thermodynamics physics

Which one of the following is the characteristic of Planck's quantum theory of radiation?

  1. The energy is not absorbed or emitted in integral multiple of quantum of energy.

  2. Radiation energy is not emitted or absorbed continuously but in the form of small packets of energy

  3. Radiation energy is emitted or absorbed continuously

  4. The magnitude of energy associated with a quantum is inversely proportional to its frequency
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Planck's quantum theory, radiation is emitted in the form of small packets of energy and is not continuous. Quantum of energy can be expressed by the relation E=hv, where h is Planck's constant and v is the frequency.

Multiple choice electromagnetic spectrum electromagnetic waves physics

The matter-wave picture of electromagnetic wave/radiation elegantly incorporated the:

  1. Heinsenbergs uncertainty principle

  2. correspondence principle

  3. cosmic theory

  4. Hertzs observations
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The matter-wave picture of electromagnetic wave/radiation elegantly incorporated  the Heisenberg uncertainty principle.

The correct option is A.

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

Which of the following entities are closely associated to each other

  1. Gravitation and nuclear fusion

  2. Electricity and magnetism

  3. Chemical Bonding and Planetary motion

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electric current and magnetism are very closely related phenomenon and both can be generated using the other.

Multiple choice maths similarity relation between perimeters of similar shapes basic proportionality theorem and its converse basic proportionality theorem

Basic proportionality theorem  is also known as

  1. Basic theorem

  2. Thales Theorem

  3. Potential theorem

  4. Unknown
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Basic proportionality theorem is also known as Thales Theorem. Thales was a famous Greek mathematician who gave an important truth relating two equiangular triangles.
Therefore, C is the correct answer.

Multiple choice physics kirchhoff's law circuit problems kirchoff's law and problems on it equivalent resistance in series and parallel connection

Kirchoffs law of junctions is also called the law of conservation of:

  1. Energy

  2. Charge

  3. Momentum

  4. Angular momentum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Kirchoff's second law:- According to the law, at a particular junction the charge entering the junction is equal to charge exiting that junction.
$ \Rightarrow$ There is no charge accumulated at junction. This is also called as law of conservation of charge.

Multiple choice physics dual nature of matter and radiation davisson and germer experiment and its conclusion matter waves wave nature of matter

Davisson and Germer experiment represents _______ nature of the electron.

  1. Wave

  2. Particle

  3. Wave and particle

  4. Doesn't represent any nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Davisson-Germer experiment was conducted by two American scientists Clinton Davisson and Lester Germer, in 1927, to verify the de Broglie hypothesis that a material particle posses wave nature. 

The electron beam was made to pass through a hole and strike the nickel crystal normally, the electrons scattered in all directions acting like waves. The detector indicated the peak intensity of scattered electrons at certain angle. This maximum intensity was due to constructive interference of two waves. Thus wave nature of electrons was experimentally proved.

Multiple choice physics dual nature of matter and radiation davisson and germer experiment and its conclusion matter waves wave nature of matter

Davisson Germer experiment explained the wave nature of electrons through 

  1. Electron diffraction

  2. Electron interference

  3. Electron scattering

  4. Failed to explain wave nature of electrons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Davisson-Germer experiment was conducted by two American scientists Clinton Davisson and Lester Germer, in 1927, to verify the de Broglie hypothesis that a material particle posses wave nature. They experimentally proved the wave nature of electron through diffraction of electron beam by a nickel crystal.