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

Matter has ___________.

  1. no mass but occupies space

  2. mass but occupies no space

  3. mass and occupies space

  4. no mass and occupies no space
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Matter is that Physical substance in general, as distinct from mind and spirit; that which occupies space and possesses rest mass, especially as distinct from energy

Multiple choice

The force between particles of matter is called as ___________.

  1. cohesive force

  2. adhesive force

  3. kinetic energy

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

Cohesive force is the force of attraction between the molecules of the same substance. Cohesive force is stronger in solids than in liquid. Cohesive force is stronger in liquids than in gas.

Multiple choice

Which of the following statements is true about the particles of matter?

  1. The kinetic energy of the particles of matter is independent of temperature.

  2. The spaces among the particles of matter decrease with increase in temperature.

  3. The spaces among the particles of matter increase with decrease in temperature.

  4. The kinetic energy of the particles of matter increases with increase in temperature.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Matter consists of small particles, which have spaces between them. Particles of matter are continuously moving and they possess kinetic energy. The kinetic energy of the particles is directly proportional to temperature, i.e. on increasing the temperature, the kinetic energy of the particles increases. 

Multiple choice

The pyramid of energy is always

  1. opaque

  2. horizontal

  3. inverted

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

An energy pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain. It is always upright.

Multiple choice

Which of the following is not a postulate of Dalton’s atomic theory?

  1. Matter is made up of tiny particles called atoms.

  2. An atom comprises of smaller particles, which are neutrons, protons and electrons.

  3. Atoms can neither be created nor destroyed.

  4. Atoms of different elements have different masses and chemical properties.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option (2) is correct. Dalton stated that atoms are indivisible. He did not propose the existence of sub-atomic particles.

Multiple choice

An atom is

  1. the smallest particle of matter known

  2. the smallest particle of a gas

  3. the smallest indivisible particle of an element, that can take part in a chemical reaction

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

An atom is the smallest particle of matter and it is composed of particles called protons, electrons and neutrons.

Multiple choice physics optoelectronic devices resistance and temperature

In He-Ne laser, metastable state exists in: 

  1. He

  2. Ne

  3. Both (1) & (2)

  4. Neither He nor Ne
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a He-Ne laser, metastable states are essential for the lasing action and exist in both Helium and Neon atoms. Helium is excited by electric discharge to a metastable state, then transfers energy to Neon atoms through collision, populating Neon's metastable state which leads to stimulated emission at 632.8 nm.

Multiple choice

All matter is made up of small particles called _____

  1. Protons

  2. Atoms

  3. Molecules

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

All matter is composed of atoms, which are the basic building blocks of elements. While atoms contain protons and electrons, and can form molecules, the fundamental particle of matter is the atom.

Multiple choice

Atoms move freely and can be compressed 

  1. Solid

  2. Liquid

  3. Gas

  4. Plasma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a gas, particles are far apart and move rapidly and randomly. Because of the large spaces between particles, gases are easily compressed.