Home › NEET Physics MCQs › Atoms
NEET & JEE · Physics · Class 12

Atoms — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
₹0no login
Take the Atoms test →
Free · your all-India rank after you finish

Sample questions from this chapter

How did Thomson's atomic model arrange positive charge and electrons?
  1. Positive charge filled the atomic volume with electrons embedded in it ✓
  2. Positive charge occupied a tiny nucleus with electrons outside
  3. Positive and negative charges formed two separate hemispheres
  4. Electrons filled a positive shell around an empty centre
Answer: A. Thomson's plum-pudding model embedded electrons in a diffuse sphere of positive charge.
Why not B: A concentrated nucleus is Rutherford's later model.
Why not C: Thomson proposed a roughly uniform positive distribution rather than charge-separated halves.
Why not D: The positive material occupied the volume; it was not only an outer shell.
What is the energy of the nth Bohr level of hydrogen?
  1. +13.6n² eV
  2. −13.6n² eV
  3. −13.6/n² eV ✓
  4. +13.6/n eV
Answer: C. Hydrogen bound-state energies are En=−13.6 eV/n² and approach zero from below as n increases.
Why not A: Bound levels are negative and become less widely spaced at large n.
Why not B: This grows more negative with radius instead of approaching zero.
Why not D: The sign and inverse-square dependence are both incorrect.
A 7.70 MeV alpha particle approaches a gold nucleus head-on. What closest-approach distance is predicted? Use Z=79, k=9.00×10⁹ N m² C⁻² and e=1.60×10⁻¹⁹ C.
  1. 3.03×10⁻¹⁴ m ✓
  2. 6.06×10⁻¹⁴ m
  3. 3.03×10⁻¹⁵ m
  4. 1.52×10⁻¹⁴ m
Answer: A. d=k(2e)(Ze)/K with K=7.70×10⁶ eV gives d=3.03×10⁻¹⁴ m.
Why not B: This doubles the Coulomb energy after the alpha charge 2e is already included.
Why not C: This loses one power of ten when converting 7.70 MeV to joules.
Why not D: This omits the alpha particle's charge factor two.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Atoms →

Other NEET Physics chapters

Units and MeasurementMotion in a Straight LineMotion in a PlaneLaws of MotionWork Energy and PowerSystems of Particles and Rotational Motion

All 28 chapters →

Questions

How many NEET questions are there on Atoms?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.