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

What did John's Atomic Model look like?

  1. One big sphere

  2. A flat circle

  3. A group of smaller circles

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

John Dalton's atomic theory proposed that atoms were indivisible, solid spheres. He often visualized them as hard, billiard-ball-like particles.

Multiple choice

The measure of the amount of matter in an object.

  1. mass

  2. gravity

  3. scientific method

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

Mass is defined as the measure of the amount of matter in an object. Gravity is a force, and the other options are methods or philosophies.

Multiple choice

Why is physics the most basic science?

  1. the concepts of physics are the foundation of other science

  2. physics is the easiest science

  3. physics is basic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Physics is often considered the most basic science because it deals with the fundamental laws of matter, energy, space, and time, which underpin all other natural sciences like chemistry and biology.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

The kinetic theory considers all matter ( substances) to be made up of particles which are in continuous motion.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The kinetic theory considers all matter( substances) to be made up of particles which are in continuous motion. 


On raising the temperature, the solid-state, in which the particles are closely packed in regular arrangement changes into the liquid sate where particles are closely packed in a random arrangement. this process is called melting.

Hence, it is a true statement.

Multiple choice

Which answer is not a Particle Structure in Liquids?

  1. molecules relatively close together

  2. molecules move about relative to each other

  3. molecules not easily compressible.

  4. molecules move freely about to fill the available space
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Liquids have a definite volume and are relatively incompressible, but they do not expand to fill any available space like gases do. That behavior is specific to gases.

Multiple choice physics static electricity properties of charges charge properties of charge

Quantisation of charge implies :

  1. charge cannot be destroyed

  2. charge exists on particles

  3. there is a minimum permissible charge on a particle

  4. charge, which is a fraction of a charge on an electron is not possible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Quantisation of Charge means that we say something has some charge , we mean by that that how many times the charge of electrons it has.  Because  whole charge is associated with an electron.

Multiple choice physics static electricity properties of charges charge properties of charge

Quantisation of charge implies

  1. charge does not exiet

  2. charge exists on particles

  3. there is a minimum permissible magnitude of charge

  4. charge can't be created
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The word quantised means any quantity is an integral multiple of a minimum value and cannot have any value equal to decimal multiples.

The minimum charge that exists in nature is $1.6\times10^{-19}$ coulombs.
It is the positive value for one proton and negative for an electron.
Any charged body has a positive charge if electrons are less than needed and vice-versa.
Whatever may be the case, the magnitude of charge is always an integral multiple of $1.6\times10^{-19}$ coulombs.
Thus charge is quantised.

Multiple choice physics behaviour of perfect gas and kinetic theory of gases degree of freedom: law of equipartition of energy law of equipartition of energy law of equipartition of energy and mean free path

A system consists of N particles, which have independent K relations among one another. The number of degrees of freedom of the system is given by :

  1. 3 NK

  2. N/3K

  3. 3 N/K

  4. 3N - K
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For a system of N particles having K independent relations among them, the degrees of freedom of the system is given by 3N-K. 3N  is due to three degrees of freedom associated with each particle if all the particles are independent of each other (i.e K=0) and due to K relation among them, degrees of freedom reduces to 3N-K

Hence, Option D is correct.

Multiple choice chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

According to Dalton's atomic theory, the smallest particle in which matter can exist is called :

  1. an atom.

  2. an ion.

  3. an electron.

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

DALTON'S ATOMIC THEORY :

1. Matter is made up of very small undivisible particle called atoms.

2. All the atoms of a given element is identical in all respect i.e. mass, shape, size, etc.

3. Atoms cannot be created nor destroyed by any chemical process.

4. Atoms of different elements are different in nature.