COMEDK UGET 2025 Atoms and Nuclei Practice Questions with Solutions

COMEDK UGET 2025 Atoms and Nuclei Practice Questions: Atoms and Nuclei is one of the important chapters from the COMEDK Physics syllabus 2025. Atoms and Nuclei topics require a combination of theoretical knowledge and the art of tackling lengthy complex calculations. Therefore, you should thoroughly prepare for this chapter. We have added the COMEDK UGET 2025 Atoms and Nuclei practice questions with solutions that you can attempt to test your understanding of the topic. These COMEDK sample questions of Atoms and Nuclei have been taken from the previous year's papers. Atoms and Nuclei carry 13-15% of weightage in the COMEDK UGET 2025 exam and will have around 8 to 9 questions. Since it is a high-weightage topic, you must study all the sub-topics included in Atoms and Nuclei and solve various questions related to it.

COMEDK UGET 2025 exam will be held on May 10, 2025. The COMEDK UGET 2025 syllabus level is as per Class 11 and 12th standard. Refer to NCERT books to study Atoms and Nuclei and then move on to studying from other top authors' books. Solve COMEDK UGET 2025 Atoms and Nuclei practice questions given on this page for solid exam preparation. We have also mentioned the important sub-topics and the expected weightage for COMEDK Atoms and Nuclei here.

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COMEDK UGET 2025 Atoms and Nuclei Important Topics

Atoms and Nuclei in COMEDK UGET 2025 Physics syllabus includes various sub-topics that you must prepare well. The sub-topics of Atoms and Nuclei COMEDK syllabus are Rutherford’s model of the atom, Mass defect, Velocity and energy of electrons in this orbit etc. Check the detailed COMEDK UGET 2025 Atoms and Nuclei sub-topics for exam preparation below.

COMEDK UGET 2025 Atoms and Nuclei Expected Weightage

You should be aware of the COMEDK UGET topic-wise weightage while preparing for the exam. Atoms and Nuclei carries a significant weightage in the COMEDK UGET exam 2025. In the previous year around 8 questions were asked from this chapter in the Physics paper. For the academic year 2025, you can expect 8 to 9 questions to be asked from Atoms and Nuclei.

Since the weightage of Atoms and Nuclei is high, you must give proper attention to these topics. Study the complete topics listed under Atoms and Nuclei, and solve the following COMEDK sample questions for practice purposes.

COMEDK UGET 2025 Atoms and Nuclei Practice Questions with Solutions

Once you have gained an understanding of the COMEDK UGET syllabus, you should solve questions practically to see where you are still lacking, whether you are forgetting formulas or concepts. Attempting the COMEDKAtoms and Nuclei practice questions will help you analyze your mistakes and improve them.

Take a look at the COMEDK UGET 2025 Atoms and Nuclei practice questions with solutions here.

Q1- Which of the following statements is true when a gamma decay occurs from the nucleus of an atom?

A) Mass number is reduced by 4 and the atomic number remains the same

B) Mass number remains the same and the atomic number increases by 1

C) Mass number and atomic number are not changed

D) Mass number is reduced by 4 and the atomic number is reduced by 2

Correct Answer: Option C

Explanation: Gamma decay is the release of gamma rays from a nucleus. Gamma rays are high-energy photons that carry no charge. They are typically emitted by the nucleus during radioactive decay, as the nucleus moves from a higher to a lower energy level. Gamma decay, unlike alpha and beta decay, does not emit particles from the nucleus, such as protons or neutrons. As a result, the emission of gamma rays has no effect on the nucleus's protons or neutrons.

Option C is correct because during gamma decay, neither the mass number nor the atomic number of the atom is changed. Gamma decay solely involves a change in the energy state of the nucleus, with no alteration in the number of protons or neutrons.

Q2- During α decay the, atomic mass of parent nuclei is

A) Decreased by 2 units

B) Increased by 2 units

C) Decreased by 4 units

D) Increased by 4 units

Correct Answer: Option C

Explanation: During α decay, the atomic mass of parent nuclei is decreased by 4 units while the atomic number is decreased by 2 units.

Q3- Which of the following series spectrum of hydrogen atoms lies in the ultraviolet region?

A) Paschen series

B) Brackett series

C) Pfund series

D) Lyman series

Correct Answer: Option D

The Lyman series is in the ultraviolet range, whereas the Paschen, Brackett, and Pfund series are in the infrared region.

Q4- The mass density of a nucleus varies with mass number A as

A) ⁰ A

B) A ²

C) 1 divide by A

D) In A

Correct Answer: Option A

Explanation:

As, the mass density of a nucleus is constant

∴ Mass density= 3m divided by 4 π R ^{3 ₀}

Q5- The Lyman series of a hydrogen atom belongs in which category

A) Ultraviolet region

B) Infrared region

C) Visible region

D) None of these

Correction Answer: Option A

Explanation: The Lyman series of a hydrogen atom occurs in the ultraviolet portion of the electromagnetic spectrum.

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