Top Strategies to Ace JEE Main Atoms and Nuclei Mock Tests
Atoms and Nuclei is a vital chapter in JEE Main Physics, covering atomic structure, radioactivity, and nuclear reactions—concepts with both theoretical and numerical significance in the exam. Mastering topics like Rutherford’s model, Bohr’s quantization, and radioactive decay equips you to solve some of the most scoring questions. Take this curated mock test to strengthen your fundamentals and build confidence for JEE Main 2025.
Mock Test Instructions for the Atoms and Nuclei Mock Test-3:
- 20 questions from Atoms and Nuclei Mock Test-3
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Boost Your Preparation for Atoms and Nuclei?
- Identify weak areas in atomic models and nuclear physics via timed MCQ practice.
- Strengthen your understanding of radioactive decay laws by solving exam-oriented problems.
- Simulate actual JEE Main exam pressure to enhance speed and accuracy.
- Get exposed to a variety of conceptual and calculation-based questions from Atoms and Nuclei.
- Instant feedback helps pinpoint misconceptions in isotope and nuclear reaction concepts.
Master Atomic Structure & Radioactivity with Expert-Vetted JEE Mock Tests
- Revise key formulae for energy levels, mass defect, and decays through mock tests.
- Practice application-based problems on half-life, nuclear reactions, and emission spectra.
- Use post-test analytics to refine your problem-solving approach under time constraint.
- Track your mastery of JEE Physics weightage topics with targeted chapterwise quizzes.
- Simulate previous year JEE Main question patterns focused on Atoms and Nuclei.
Subject-Wise Excellence: JEE Main Mock Test Links
| S.No. | Subject-Specific JEE Main Online Mock Tests |
|---|---|
| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
Important Study Materials Links for JEE Exams
FAQs on Atoms and Nuclei Mock Test for JEE Main 2025-26 Preparation
1. What is the difference between an atom and a nucleus?
An atom consists of a dense central nucleus surrounded by electrons in various energy levels. The nucleus contains protons and neutrons, which account for most of the atom's mass, while the electrons occupy the remaining space and define the atom's volume. The nucleus is extremely small and dense compared to the whole atom.
2. What are isotopes and how do they differ from each other?
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Therefore, isotopes have identical chemical properties but different atomic masses and may show variations in stability and radioactivity.
3. What is radioactivity?
Radioactivity is the spontaneous emission of particles (such as alpha, beta) or energy (gamma rays) from the unstable nucleus of certain elements. This process leads to the transformation of one element into another and is fundamental in nuclear physics.
4. Name the three types of radioactive decay.
The three main types of radioactive decay are:
1. Alpha decay – emission of an alpha particle (2 protons, 2 neutrons).
2. Beta decay – emission of a beta particle (an electron or positron).
3. Gamma decay – emission of gamma rays (high-energy photons).
5. Explain the concept of half-life in radioactivity.
The half-life of a radioactive element is the time required for half of the original number of unstable nuclei in a sample to decay. It is a characteristic property for each radioactive isotope and is used to measure rates of nuclear decay and radioactive dating techniques.
6. What are the main constituents of a nucleus?
The main constituents of a nucleus are protons (positively charged particles) and neutrons (neutral particles). Together, they are known as nucleons and are held together by strong nuclear forces.
7. What is mass defect and binding energy?
The mass defect is the difference between the actual mass of a nucleus and the sum of the individual masses of its protons and neutrons. This missing mass, known as binding energy, is released when the nucleus forms, and represents the energy required to separate the nucleus into its constituent nucleons, following Einstein’s equation (E = mc²).
8. What is the significance of the atomic number and mass number?
The atomic number (Z) represents the number of protons in the nucleus and determines the chemical identity of the element. The mass number (A) is the total number of protons and neutrons in the nucleus, indicating the isotope of the element.
9. What is nuclear fission and where is it used?
Nuclear fission is a process in which a heavy atomic nucleus splits into two or more lighter nuclei, releasing a large amount of energy. It is widely used in nuclear reactors and atomic bombs for producing energy and destructive power, respectively.
10. Define nuclear fusion. Where does it commonly occur?
Nuclear fusion is the process in which two light atomic nuclei combine to form a heavier nucleus, releasing tremendous energy. Fusion commonly occurs in stars, including the Sun, where hydrogen nuclei fuse to form helium.
11. Who discovered the nucleus of an atom?
The nucleus of an atom was discovered by Ernest Rutherford in 1911 through his famous gold foil experiment, which demonstrated that atoms contain a dense, positively charged central core.
12. Why are some nuclei unstable?
Some nuclei are unstable due to an imbalance between the number of protons and neutrons, excessive size, or energy content. This instability causes them to undergo radioactive decay to achieve a more stable state.
