Physics · JEE

Composition and size of nucleus, atomic masses, mass-energy relation, mass defect Concepts for JEE

60+ syllabus-aligned questions available

Quick answer

Master Composition and size of nucleus, atomic masses, mass-energy relation, mass defect by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for Composition and size of nucleus, atomic masses, mass-energy relation, mass defect before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

Composition and size of nucleus, atomic masses, mass-energy relation, mass defect is a core JEE Main Physics subtopic under Atoms and Nuclei. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Composition and size of nucleus, atomic masses, mass-energy relation, mass defect in the JEE syllabus
Memorise key formulas and standard results linked to Composition and size of nucleus, atomic masses, mass-energy relation, mass defect
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise Composition and size of nucleus, atomic masses, mass-energy relation, mass defect with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to Composition and size of nucleus, atomic masses, mass-energy relation, mass defect and reattempt after 48 hours

Common trap

Students often rush Composition and size of nucleus, atomic masses, mass-energy relation, mass defect questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Atoms and Nuclei in JEE Main Physics.

Free sample questions

Attempt 8 free MCQs for Composition and size of nucleus, atomic masses, mass-energy relation, mass defect. Unlock 52+ more with Pro.

Unlock full bank

Q1PhysicsUnit 18: Atoms and Nuclei

Which of the following pairs are isotopes?

Q2PhysicsUnit 18: Atoms and Nuclei

Assertion The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it. Reason The whole mass of the atom is concentrated in the nucleus.

Q3PhysicsUnit 18: Atoms and Nuclei

The missing particle in the reaction:

\underset{99}{253} \boldsymbol{E} \boldsymbol{s}+_{2}^{4} \boldsymbol{H} \boldsymbol{e} \rightarrow_{101}^{256} \boldsymbol{M} \boldsymbol{d}+

Q4PhysicsUnit 18: Atoms and Nuclei

A radioactive material decays by simultaneous emission of two particles with half-lives 1620 yr and 810 yr respectively. The time in years after which one-fourth of material remains, is

Q5PhysicsUnit 18: Atoms and Nuclei

Assertion A nucleus having enrgy

E_{1}

decays by

\beta

emission to daughter nucleus having energy

E_{2}

but the

\beta

-rays are emitted with a continuous energy spectrum having end point energy

\boldsymbol{E}_{\mathbf{1}}-\boldsymbol{E}_{\mathbf{2}}

Reason To conserve energy and moment in

\boldsymbol{\beta}

decays at least three particles must take part in the transformation.

Q6PhysicsUnit 18: Atoms and Nuclei

When a radioactive nucleus emits a

\beta

particular, the proton- neutron ratio

Q7PhysicsUnit 18: Atoms and Nuclei

\alpha

and

\beta

- particles emitted when uranium nucleus

_{92} U^{238}

decay to

82 P b^{214}

are

Q8PhysicsUnit 18: Atoms and Nuclei

Beta particles are essentially:

Want unlimited Composition and size of nucleus, atomic masses, mass-energy relation, mass defect practice?

Pro unlocks the full question bank, topic filters, and attempt history.

Get started free View Pro plans

Frequently asked questions

What concepts in Composition and size of nucleus, atomic masses, mass-energy relation, mass defect are essential for JEE?

Focus on core ideas across Composition and size of nucleus, atomic masses, mass-energy relation, mass defect. JEE tests application, not just memorisation.