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 chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Which of the following is a fundamental property of a substance?

  1. Density

  2. Mass

  3. Volume

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

The fundamental property of a substance is the property which depends on the body and does not change due to any physical factor. Mass is a fundamental property of a substance. Another such property is the charge.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

The open system(s) is/are which

  1. can exchange matter with the surroundings

  2. can exchange energy with the surroundings

  3. can exchange both matter and energy with the surroundings

  4. cannot exchange either matter or energy with the surroundings
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Types of system : 
(i)Closed system : A system which can exchange only energy with surrounding. 
(ii)Open system : A system which can exchange both energy and matter with surrounding. 
(iii)Isolated system : A system which cannot exchange matter or energy with surrounding.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A system which cannot exchange matter and energy with the surroundings called isolated.

  1. True

  2. False

  3. Ambiguous

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A system which  cannot exchange matter and energy with the surroundings called isolated system.
A liquid in a sealed thermos flask and ice in a thermos flask are examples of isolated systems.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

An isolated system is that system in which:

  1. there is no exchange of energy with the surroundings

  2. there is exchange of mass and energy with the surroundings

  3. there is no exchange of energy and mass with the surroundings

  4. there is exchange of energy and mass with the surroundings
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An isolated system is a thermodynamic system that cannot exchange either energy or matter (mass) outside the boundaries of the system. An isolated system differs from a closed system by the transfer of energy. Closed systems are only closed to matter, energy can be exchanged across the system's boundaries.
Hence, correct answer is option C. 

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics
What  describe the Einsteins equation for the relativity of mass and energy ?

  1. a small amount of mass contains a lot of energy.

  2. a small amount of energy can be converted into a large amount of mass.

  3. a small amount of mass contains a small amount of energy.

  4. mass can be converted into energy, but energy cannot be converted mass.

  5. energy can be converted into mass, but mass cannot be converted into energy.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sir Einstein's mass-energy equation states that mass and energy can be converted into each other by the following relation.

                 $E=mc^{2}$,    ($c=$speed of light)
This implies that a small amount of mass contains a lot of energy, which can be proved with an example.
Let we have a mass of $1g=10^{-3}kg$ , therefore energy produced by it will be:
                      $E=10^{-3}\times \left(3\times10^{8}\right)^{2}=9\times10^{13}J$ 
which is a vast amount energy produced by only one gram (small mass) of mass.
Whereas a small amount of energy doesn't give a large amount of mass because for that we have to divide the energy by $c^{2}$, which gives a small mass.

Multiple choice

What law states that energy cannot be created or destroyed?

  1. Law of Conservation of Mass

  2. Law of Destructive Forces

  3. Law of Conservation of Energy

  4. Theory of Energy Conservation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Multiple choice

Bruce Banner has vast knowledge of Quantum Physics, which is best summarized as:

  1. How the Universe works on a large scale

  2. How strings are thought to make up the Universe

  3. How the Universe works at a sub-atomic level

  4. Quantum Physics is purely fiction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Quantum physics is the branch of physics that deals with the behavior of matter and energy at the scale of atoms and subatomic particles.

Multiple choice

Which model of the atom is used today?

  1. Plum Pudding Model

  2. Bohr Model

  3. Electron-Cloud Model

  4. Billiard Ball Model
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The electron-cloud model (also known as the quantum mechanical model) is the modern model of the atom used today. It describes the regions around the nucleus where electrons are most likely to be found, rather than fixed orbits like the Bohr model.

Multiple choice

What is Niels Bohr’s contribution to modern atomic theory?

  1. Electrons exist outside of the nucleus.

  2. Electrons have a negative charge.

  3. Electrons are found in specific energy levels.

  4. Electrons exist in regions of space called orbitals.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Niels Bohr proposed that electrons travel around the nucleus in circular orbits at specific, quantized energy levels. This was a major advancement from previous models, though it was later refined into the electron-cloud model.