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JEE Advanced Modern Physics Important Questions

Last updated date: 28th Feb 2024
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Important Questions from Modern Physics for JEE Advanced

Modern Physics is a very high scoring subject from the JEE Advanced syllabus. Many aspirants tend to ignore it as they think this segment has very little weightage in the exam. But if you go through the entire JEE Advanced syllabus, you will understand the chapter-wise weightage of Modern Physics. Thus keeping you in mind, we have provided important questions for Modern Physics along with the solutions.


JEE Advanced Important Questions


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JEE Advanced

Chapter Name:

Modern Physics

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English Medium



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Chapter-wise Important Questions with PDF

Master the Concepts of JEE Advanced Physics Modern Physics with Our Practice Papers

Want to improve your chances of success on the JEE Advanced Physics Modern Physics exam? Download our JEE Advanced Physics Modern Physics practice paper in PDF format. With targeted questions and in-depth solutions, you can identify and address any areas where you need improvement. Start practicing today and see the difference!

Competitive Exams after 12th Science

Right Strategy to Study for JEE Advanced

Many students tend to think of the JEE advanced as a completely different ballgame and panic about what they should study more in order to repeat their success in the JEE Mains. This is mostly not true because the syllabus largely stays the same, and barring some exceptions, it is only the difficulty level and the pattern of the paper that changes. 

Thus, it is highly advised that students refrain from trying to learn different concepts altogether but stick to what they’ve learnt, revise it well over and over again and work on time management and reduce chances of getting negative marks.

If you are wondering about the syllabus of Modern Physics, we have decided to provide you with an outlook of the Modern Physics syllabus from the JEE Advanced syllabus. Modern Physics consists of important concepts such as Photoelectric Effect, Bohr’s Theory, X-Rays, de Broglie wavelength of matter waves, Moseley’s Law, Radioactivity and Nuclear physics while the photoelectric effect has already been taught in Class 11th Chemistry. Hence if you study Modern Physics well, you will be able to cover a portion from the JEE Advanced Chemistry syllabus. So, your concepts must have been clear while preparing for the board exam.

Chapter Summary: Modern Physics

The "Modern Physics" chapter in JEE Advanced explores the secrets of the atomic world. Imagine atoms as cities, each with a bustling nucleus. This chapter delves into the nucleus, revealing how it emits alpha, beta, and gamma particles. It introduces the laws of radioactive decay, akin to understanding changes in a city over time. Concepts like half-life and mean life measure how long it takes for particles to escape the nucleus. Binding energy is like the glue holding the nucleus together. Fission and fusion processes, like breaking and building Lego pieces, show how nuclei transform. Calculating energy in these processes unveils the power within atoms.

Topic of Modern Physics:

1. Atomic Nucleus:

At the heart of every atom is a tiny, dense core called the nucleus. It's like the central command center of an atom.

2. Alpha, Beta, and Gamma Radiations:

Imagine the nucleus as a bustling city. Sometimes, particles (like alpha and beta particles) or energy (gamma radiation) escape from this nucleus. It's like citizens leaving the city, each type with its own characteristics.

3. Law of Radioactive Decay:

Just as cities change and evolve, atomic nuclei also undergo changes over time. The law of radioactive decay helps us understand and predict how these changes occur.

4. Half-Life and Mean Life:

Think of the half-life as the time it takes for half of the escaping particles to leave the nucleus. It's like saying, "After a certain time, half the citizens will have left the city." Mean life is an average measure of how long it takes for particles to leave.

5. Binding Energy and its Calculation:

If the nucleus is like a tightly-knit community, binding energy is the force holding everyone together. Calculating binding energy helps us understand how stable and tightly bound the nucleus is.

6. Fission and Fusion Processes:

Picture the nucleus like a Lego structure. In fission, the nucleus splits into smaller parts, like breaking apart Lego pieces. In fusion, smaller nuclei join together, like connecting Lego pieces to build something bigger.

7. Energy Calculation in these Processes:

Whenever Lego pieces are broken or joined, there's an energy release or absorption. Similarly, in fission and fusion, energy is released or absorbed. Calculating this energy is crucial for understanding the power potential of these processes.

So, in a nutshell, the "Modern Physics" chapter dives into the dynamic world of the atomic nucleus, exploring how it changes, releases energy, and influences the behavior of particles. It's like unraveling the mysteries of a bustling, tiny city at the heart of every atom.

Features of Question Sets

Features of the Question Sets Provided by Vedantu:

  • Available to everyone, for free. 

  • Can be downloaded to be viewed anytime and anywhere, even without an internet connection.

  • Prepared by subject experts who are backed by tons of experience in the academic field

  • Made keeping in mind the pattern that the official paper follows.

  • Short and crisp, doesn’t contain unnecessarily difficult/out of the blue chapters

  • Solutions are provided so students can correct their mistakes then and there.

Our set of Modern Physics important questions contains the type of questions that you are going to come across in the JEE Advanced exam. Mostly theoretical questions are framed from this unit of Physics. You should focus more on understanding the basic concepts of this unit first. You will mostly come across formula-based questions from this unit. Hence it is mandatory to memorize all the formulae properly so that you can use them while solving all the questions. You can download the JEE Advanced Modern Physics Important Questions PDF file for free from our site anytime as per your requirement.


"JEE Advanced Modern Physics Important Questions" on Vedantu acts as a friendly guide through the atomic universe. Just like exploring a fascinating city, it breaks down complex concepts into manageable parts. From alpha and beta particles to the laws of radioactive decay, it simplifies the nucleus's secrets. With clear explanations on half-life, mean life, and binding energy, it's like having a roadmap for navigating the atomic city. The engaging content on fission, fusion, and energy calculations is like discovering the city's hidden treasures. In essence, this resource transforms challenging physics into an exciting adventure, making JEE Advanced prep enjoyable and effective.

FAQs on JEE Advanced Modern Physics Important Questions

1. What books should students refer to, in order to study Modern Physics for the JEE Advanced?

Considering how vital this module is for future engineers as well as its regular occurrence in the JEE paper, it should only be expected that many authors have provided their versions of copies that explain this subject matter in great detail. Some of the most commonly used ones have to be one of the modules of DC Pandey’s Understanding Physics (titled Optics and Modern Physics) as well as HC Verma’s Concepts of Physics (Module 2). Chapters 42 to 46 of HC Verma’s book cover the topic thoroughly. If students are looking for additional summary notes of revision pdfs, they can refer to Vedantu’s official website.

2. Can you explain the basics of Nuclear Physics along with important terminologies as discussed in chapter Modern Physics?

Every atom consists of a tiny, positively charged centre containing the neutrons (neutral) and protons (positively charged), which is called the nucleus. The branch of physics that deals specifically with the study of the nucleus and its behaviour is known as Nuclear physics. Before diving deep into nuclear physics, it is important to get the basics right and understanding the following terms will help with exactly that:

  • Isotopes: Atoms having the same value of atomic number ( the number of protons in an atom, denoted by Z) but a different value of atomic mass number ( the sum of the number of protons and neutrons in an atom, denoted by A) are known as Isotopes.

  • Isobars: Exactly the opposite of Isotopes, Isobars are the atoms that have the same mass number (A) but a different atomic number (Z)

  • Isotones: The Atoms that have a different atomic number despite having the same number of neutrons are known as Isotones.

  • Nature of the Nuclear force: It is on the four fundamental forces in Nature and has properties of its own like being attractive, charges independent, short-range etc. These must be studied in detail before learning more things.

3. What are the different theories of the atomic model that students are expected to study according to the chapter Modern Physics?

The discovery of the atom was certainly not a short process and it took a lot of years and dedicated efforts of a lot of scientists in order to reach a widely accepted model of the atom. Various scientists provided their own models and were further proven either correct or wrong by future scientists. However, the most important ones of them from an exam point of view are:

  1. ‘Plum Pudding Model’ as proposed by J.J Thompson in 1904.

  2. Rutherford’s atomic model (derived from the α-particle scattering experiment)

  3. The atomic model provided by Neil Bohr, known as Bohr’s atomic model.

Students are expected to know both the advantages and the drawbacks of each of these theories.

4. Going by the concepts of Modern Physics, what do you mean by Ionization Potential/Ionization Energy?

As we all know, an atom is considered to be electrically neutral. When an atom develops a charge, be it positive or negative, it can no longer be termed as an atom but is instead called an ‘ion’. The difficulty with which this process takes place, that of removing an electron from an atom that turns it into an ion is known as the Ionization Energy of that atom. This endothermic process usually takes place when the atoms are in their ground state. More the difficulty is to remove an electron, the higher the ionization potential. This can also be further studied as First Ionization Energy and Second Ionization Energy, which basically mean the energy required to remove the first and second electron respectively.

5. In simple terms, what is the Photoelectric effect as discussed for JEE Advanced chapter Modern Physics?

The Photoelectric effect is one of the most commonly asked upon questions both in the mains and advanced and students can almost be certain of expecting at least one question about it in their exam. Without the use of complex jargon, the Photoelectric effect is basically the phenomenon where electrons are emitted from the surface of a metal when light rays are incident upon it. The emission of electrons is directly proportional to the intensity of the light that is incident on the metallic surface.

That about sums it up for this article where we discussed the answers to some of the most frequently asked questions by students regarding this topic and of course, took a look at some interesting problems based on the Modern Physics module of the JEE Advanced. To get access to more such articles and study material, along with regular updates about JEE Mains and advanced, make sure to follow us on