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

The Bernoulli's theorem is based on conservation of

  1. Momentum

  2. Mass

  3. Energy

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

Bernoulli's theorem (or principle) states that for an inviscid, incompressible flow, the sum of pressure energy, kinetic energy, and potential energy per unit volume remains constant. This is fundamentally derived from the conservation of energy principle applied to fluid flow.

Multiple choice

The 2009 Nobel Prize in Physics was awarded for which of the following?

  1. For the discovery of the mechanism of spontaneous broken symmetry in subatomic physics

  2. For the discovery of a new form of quantum fluid with fractionally charged excitations

  3. For groundbreaking achievements concerning the transmission of light in fibers for optical communication

  4. For pioneering contributions to the theory of superconductors and superfluids

  5. For contributions to the development of laser-based precision spectroscopy, including the optical frequency comb technique
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The 2009 Nobel Prize in Physics was awarded to Charles Kao for groundbreaking achievements concerning the transmission of light in fibers for optical communication, and Willard Boyle and George Smith for the invention of the CCD sensor. Kao's work laid the foundation for fiber optic communications that power modern internet infrastructure.

Multiple choice

The 2009, the Nobel Prize in Physics was awarded jointly to two scientists from the US and one from Hong Kong. Which of the following statements about Nobel Prize in Physics is/are correct? I. John Bardeen is the only Nobel Laureate who has been awarded the Nobel Prize in Physics twice II. The youngest Nobel Laureate in Physics is Lawrence Bragg III. The youngest Nobel Laureate in any Prize area is from Physics

  1. I only

  2. I and II only

  3. II and III only

  4. III and I only

  5. I, II & III
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

To date, the youngest Nobel Laureate in Physics is Lawrence Bragg, who was 25 years old when he was awarded the Prize with his father in 1915. The oldest Nobel Laureate in Physics to date is Raymond Davis Jr., who was 88 years old when he was awarded the Prize in 2002.

Multiple choice

Which of the following is not true for the properties of particles of matter?

  1. The particles of matter are in stationary state.

  2. The particles of matter attract each other.

  3. The particles of matter have spaces between them.

  4. The particles of matter show repulsive force each other.

  5. The particles of matter are extremely small.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Matter has three basic states- solid, liquid and gas. The stationary state does not exist.

Multiple choice

Directions: The question is a logical sequence of statements with a missing link, the location of which is shown parenthetically. From the five choices available you are required to choose the one which best fits the sequence logically.

In 1932, Carl David Anderson discovered the first anti–particle – the positron. By the 1950s the anti–proton and the anti–neutron had been discovered. The importance of these discoveries was not just the fact that Dirac’s theory had been proven. (.) This energy of mass annihilation is known as photon energy and it promises to be a major source for our energy requirements in the very near future.

  1. They had stumbled upon a potential minefield of anti-fusion energy.

  2. More importantly, a new and unprecedented form of energy had been discovered.

  3. It was rather initiation into a new era and a new definition of energy.

  4. It opened a Pandora’s Box for future energy requirements.

  5. The importance was rather in finding a new source of energy.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Only (2) fits in coherently with the preceding and the succeeding sentences.

Multiple choice

Directions: The question contains a sentence/sentences/part thereof followed by five choices. Select from these choices the one which most logically completes the idea contained in the given sentence or part. There is hydrogen and there is oxygen, and there is chloride of sodium, and the dark blue colour is nothing but the reflection of billions of ether vibrations. But have I really to choose between two statements concerning the waves, one of which is valuable and the other not?

  1. I would choose the metaphysical dimension because it embraces the physical universe as well.

  2. Can we ever bridge the gap?

  3. The answer has been a grey area for the scientist community.

  4. On the contrary, both have fundamental value.

  5. The answer can open a can of worms.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The question is whether one is valuable and the other is not. The answer is both are valuable.

Multiple choice

Newlands' law is applicable to

  1. only lower atomic masses

  2. both lower and higher atomic masses

  3. only higher atomic masses

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

Newlsnd's law of  octaves is applicable to elements with lower atomic masses only. Among the heavier elements the properties do not repeat after every eight elements.

Multiple choice

J. J. Thomson was awarded the Nobel Prize for Physics for his work on the discovery of electrons. Which of the following was/were suggested by Thomson in his model of atom?

  1. An atom consists of a positively charged sphere and the electrons are embedded in it.

  2. An atom consists of a negatively charged sphere and the electrons are embedded in it.

  3. The negative and positive charges are equal in magnitude.

  4. Both (1) and (3)

  5. Both (2) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is correct as both are suggested in Thomson's model of atom.

Multiple choice

Which of the following postulates were put forward by Neils Bohr about the model of an atom?

a. Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom. b. While revolving in discrete orbits, the electrons do not radiate energy. c. The orbits or shells are called energy levels.

  1. a, b and c

  2. a and b

  3. b and c

  4. only a

  5. only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct answer as all the given postulates were put forward by Neils Bohr about the model of an atom.

Multiple choice

Directions: The following question contains paragraph with sentence or phrase missing indicated parenthetically. From the alternatives, select the sentence or phrase that best provides the missing link.

In 1932, Carl David Anderson discovered the first anti-particle - the positron. By the 1950s the anti-proton and the anti-neutron had been discovered. The importance of these discoveries was not just the fact that a scientific theory had been proven. ( _____ ). This energy of mass annihilation is known as photon energy and it promises to be a major source for our energy requirements in the very near future.

  1. More importantly, a new and unprecedented form of energy had been discovered.

  2. It was rather initiation into a new era and a new definition of energy.

  3. It opened a Pandora's Box for future energy requirements.

  4. The importance was rather in finding a new source of energy.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(1) “This energy of mass annihilation” is the clue.