What Are the Main Concepts Covered in Atoms and Nuclei MCQs?
This page offers the most targeted Atoms And Nuclei MCQ collection for NEET aspirants, mirroring real exam patterns. With 20 NEET-standard questions, answer keys, and in-depth explanations, it helps you identify gaps and strengthen your concepts. Use these MCQs for chapterwise mastery, boosting both your speed and accuracy for NEET 2025 Physics.
What are MCQs for Atoms And Nuclei?
Atoms and Nuclei MCQs focus on crucial NEET Physics concepts: atomic models, nuclear properties, radioactivity, mass defect, and binding energy. Each question tests theoretical understanding and calculation skills. Practicing these MCQs builds exam confidence and conceptual clarity on one of NEET’s highest-weightage topics.
Why Practice NEET Atoms And Nuclei MCQs?
Practicing NEET MCQs from Atoms and Nuclei ensures familiarity with exam trends and commonly tested problem types. Regular MCQ practice helps you improve response time, recognize distractions among options, and avoid common mistakes. It is essential for scoring higher and mastering essential Physics subtopics.
Practice MCQs: Atoms And Nuclei (NEET Level)
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The energy required to remove an electron from the ground state of a hydrogen atom is:
A. 13.6 eV
B. 0 eV
C. 1 eV
D. 3.4 eV
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What is the ratio of the speed of an electron in the first Bohr orbit of hydrogen to that in the second Bohr orbit?
A. 1 : 2
B. 2 : 1
C. 4 : 1
D. 1 : 4
-
Which of the following particles has the least mass?
A. Proton
B. Neutron
C. Electron
D. Alpha particle
-
If the half-life of a radioactive sample is 3 years, what fraction of the original sample will remain after 9 years?
A. 1/2
B. 1/3
C. 1/4
D. 1/8
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The number of neutrons in ${}^{19}_{9}\text{F}$ is:
A. 10
B. 9
C. 19
D. 8
-
The wavelength of the first line of the Balmer series of hydrogen is about:
A. 656 nm
B. 486 nm
C. 410 nm
D. 397 nm
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What is emitted during beta decay?
A. Neutron
B. Positron
C. Electron
D. Proton
-
If a radioactive sample decays to 1/16th of its original activity in 24 days, what is its half-life?
A. 6 days
B. 12 days
C. 8 days
D. 3 days
-
The atomic mass of an atom is less than the sum of the masses of its protons and neutrons because of:
A. Neutrino emission
B. Mass defect
C. Electron loss
D. Pair production
-
Which nucleus is more stable?
A. The one with the largest atomic number
B. The one with the least binding energy per nucleon
C. The one with highest binding energy per nucleon
D. The one with even number of protons only
-
What is the value of the principal quantum number n for the ground state of hydrogen atom?
A. 0
B. 1
C. 2
D. 3
-
In nuclear fission, which of the following is conserved?
A. Atomic number only
B. Mass number only
C. Sum of atomic and mass numbers
D. Both mass number and charge
-
The radioactive decay law can be expressed as:
A. $\frac{dN}{dt} = -\lambda$
B. $N(t) = N_0e^{-\lambda t}$
C. $N = \lambda t$
D. $N = N_0 t^{-\lambda}$
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If 90% of a radioactive substance decays in 2 hours, what is its half-life?
A. 38.4 min
B. 60.0 min
C. 45.6 min
D. 24.8 min
-
What is the sum of protons and neutrons in ${}^{27}_{13}\text{Al}$?
A. 13
B. 14
C. 27
D. 40
-
When a nucleus emits an alpha particle:
A. Its atomic number increases by 2
B. Its mass number decreases by 2
C. Its atomic number decreases by 2
D. Its atomic number decreases by 4
-
The total number of lines in the emission spectrum when the electron de-excites from n = 4 to n = 1:
A. 5
B. 4
C. 6
D. 3
-
The nuclear force is:
A. Long range and attractive
B. Short range and attractive
C. Long range and repulsive
D. Short range and repulsive
-
A free neutron decays into a proton, an electron and:
A. An alpha particle
B. A positron
C. An antineutrino
D. A photon
-
The activity of a radioactive sample drops from 8000 cpm to 1000 cpm in 30 minutes. How many half-lives have occurred?
A. 1
B. 2
C. 3
D. 4
MCQ Answer Key
| Q.No. | Answer | Explanation |
|---|---|---|
| 1 | A | 13.6 eV is the ground state energy of hydrogen atom. |
| 2 | B | Speed is inversely proportional to n; v1/v2 = n2/n1 = 2/1. |
| 3 | C | Electron has least mass of all listed particles. |
| 4 | D | 3 half-lives (9 years), so (1/2)3 = 1/8 remains. |
| 5 | A | Number of neutrons = mass number – atomic number = 19 – 9 = 10. |
| 6 | A | First Balmer line is H-alpha (n=3→2) at 656 nm. |
| 7 | C | Electron is emitted during beta (β-) decay. |
| 8 | A | 4 half-lives; 24/4=6 days per half-life. |
| 9 | B | Atomic mass is lower due to mass defect (binding energy). |
| 10 | C | Greater binding energy per nucleon yields more stability. |
| 11 | B | Ground state is n = 1 for hydrogen atom. |
| 12 | D | Both mass number and charge are conserved in fission. |
| 13 | B | Radioactive decay law: N = N₀e^(–λt). |
| 14 | A | Use N = N₀(1/2)t/T½; solve for T½. |
| 15 | C | Protons + neutrons = mass number = 27. |
| 16 | C | Alpha emission decreases Z by 2 and A by 4. |
| 17 | C | From n=4 to n=1, lines = n(n–1)/2 = 6. |
| 18 | B | Nuclear force is short-range and attractive. |
| 19 | C | Beta decay: neutron → proton + electron + antineutrino. |
| 20 | D | Each half-life: 8000→4000→2000→1000; 3 half-lives = 4 steps, D. |
Explanations clarify reasoning behind each answer and help students understand important NEET concepts.
How These MCQs Help in NEET Physics
Solving these Atoms And Nuclei MCQs prepares you for NEET Physics by reinforcing concepts, calculation methods, and common question structures. Detailed explanations build conceptual depth and reduce the risk of errors. Attempting such chapterwise questions regularly improves accuracy and boosts your NEET Physics score.
Tips and Next Steps
- Review explanations for every question, especially those answered incorrectly.
- Revise atomic models, radioactivity laws, and energy calculations with formula sheets.
- Explore the NEET Physics Chapterwise Mock Test for broader practice.
- Download more MCQs from the Atoms and Nuclei NEET MCQ PDF for offline revision.
- Track your accuracy and time using Vedantu’s detailed analytics for continuous improvement.
Mastering the Atoms And Nuclei MCQ set is key for a solid NEET Physics score. Targeted practice helps you identify conceptual gaps, sharpen exam strategy, and remain confident under time pressure. Build accuracy and speed—attempt new chapterwise NEET MCQs on Vedantu for optimized exam readiness!
FAQs on Atoms And Nuclei Mcq Questions to Sharpen Your Understanding
1. Where can I find NEET-level Atoms and Nuclei MCQs?
You can access NEET-level Atoms and Nuclei MCQs on dedicated educational platforms that offer chapterwise mock tests, downloadable PDFs, and instant answer keys. Practising here helps you experience NEET exam-style questions and improve accuracy through:
- Timed online tests mirroring NEET pattern
- PDF downloads of MCQ sets with answers
- Performance analytics after every attempt
- Instant answer explanations
2. How important is the Atoms and Nuclei chapter for NEET Physics?
The Atoms and Nuclei chapter is highly important for NEET Physics as it regularly features in the exam with moderate to high-weightage. Key relevance points:
- Direct conceptual and calculation-based MCQs are asked annually
- Questions focus on binding energy, atomic structure, and nuclear stability
- Helps secure crucial marks in NEET Physics section
3. Can I download the Atoms and Nuclei MCQ PDF with answers?
Yes, most NEET preparation sites offer downloadable Atoms and Nuclei MCQ PDFs with detailed answer keys. These resources are useful for offline revision and practice because they:
- Provide a bank of exam-level questions and solutions
- Feature answer explanations for self-correction
- Allow you to practise anytime, even without internet access
4. What is the question pattern for Atoms and Nuclei in NEET?
The Atoms and Nuclei question pattern in NEET consists of MCQs (single correct answer) with a focus on conceptual understanding and calculation. Notable features include:
- Each MCQ carries +4 marks for a correct answer and -1 for an incorrect answer
- Questions test knowledge of energy levels, mass defect, nuclear reactions, and atomic models
- Generally, 1-2 questions appear from this chapter in the Physics paper
5. How many MCQs are usually asked from Atoms and Nuclei?
Typically, 1 to 2 MCQs from Atoms and Nuclei are asked in the NEET Physics paper each year. These questions focus on:
- Conceptual understanding as well as numerical calculations
- Topics like nuclear stability, atomic spectra, and radioactive decay
6. How to prepare atoms and nuclei for NEET?
Preparing Atoms and Nuclei for NEET involves mastering core formulas, practising MCQs, and analyzing solution keys. Effective strategies include:
- Revise key topics like binding energy, mass defect, and atomic structure
- Solve previous year NEET questions and chapterwise mock tests
- Practice under timed conditions to improve speed and accuracy
- Review answer explanations to resolve conceptual doubts
7. How can I analyze my weak topics within Atoms and Nuclei after a mock test?
To identify weak areas in Atoms and Nuclei post-mock test, use detailed performance analytics available on most online test platforms. Steps include:
- Review question-wise report and accuracy percentage
- Focus on questions marked incorrect or skipped
- Revisit solution explanations for recurring mistakes
- Attempt those topic types again for better retention
8. Are previous year questions available for Atoms and Nuclei NEET practice?
Yes, previous year NEET questions from the Atoms and Nuclei chapter are widely available for practice. Using them helps:
- Understand exam trends and frequently asked concepts
- Practice real NEET-level MCQs with actual answer patterns
- Enhance confidence for exam-day problem solving
9. What is the fastest way to improve accuracy in Atoms and Nuclei MCQs?
The fastest way to improve MCQ accuracy in Atoms and Nuclei is to combine timed practice, formula revision, and error review. Key steps:
- Take regular chapterwise mock tests with time limits
- Memorize important formulas and practice their application
- Analyze solution keys to spot and correct common mistakes
- Attempt previous year and sample NEET questions
10. Are answer explanations provided for tricky MCQs or only answer keys?
Most NEET practice platforms provide detailed explanations for tricky Atoms and Nuclei MCQs in addition to answer keys. This helps you learn from mistakes and improve faster because:
- Step-by-step reasoning clarifies each answer
- Conceptual insights are emphasized, not just the final option
- Explanations help prevent repeating similar errors in the future
