Class 9 Science — Chapter 7: Structure of the Atom
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 9 Science Chapter 7, "Structure of the Atom", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and the JEE & NEET foundation years.
"Structure of the Atom" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Structure of the Atom, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 9 Science mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Structure of the Atom (Class 9 Science)
This chapter describes motion using distance, displacement, speed, velocity and acceleration, derives the equations of uniformly accelerated motion, and interprets motion graphs.
- Distance vs displacement
- Distance is the total path length (scalar); displacement is the shortest straight-line change in position (vector, can be zero).
- Speed vs velocity
- Speed is distance per unit time (scalar); velocity is displacement per unit time (vector, has direction).
- Acceleration
- The rate of change of velocity. It is positive when speeding up, negative (retardation) when slowing down.
- Uniform vs non-uniform motion
- Uniform motion covers equal distances in equal time intervals; non-uniform motion does not.
- Motion graphs
- On a distance–time graph the slope is speed; on a velocity–time graph the slope is acceleration and the area under it is displacement.
- Uniform circular motion
- Motion in a circle at constant speed is accelerated, because the direction (and hence velocity) keeps changing.
Key formulas — Structure of the Atom
💡 Exam tips for Structure of the Atom
- Uniform circular motion is accelerated motion because the direction of velocity keeps changing even if speed is constant.
- On a velocity–time graph, the area enclosed gives the displacement — useful when no formula seems to fit.
Sample questions
Which subatomic particle carries a positive charge?
Proton: +1. Electron: −1. Neutron: 0.
Maximum number of electrons that can be accommodated in the K shell (n=1) is:
Capacity = 2n². For n=1: 2 × 1² = 2.
The valency of an element with electronic configuration 2, 8, 1 is:
Outer shell has 1 electron (Na). Valency = 1 (loses 1 electron).
Structure of the Atom — FAQs
What are the key concepts in Class 9 Science Structure of the Atom?+
This chapter describes motion using distance, displacement, speed, velocity and acceleration, derives the equations of uniformly accelerated motion, and interprets motion graphs. Key ideas include Distance vs displacement, Speed vs velocity, Acceleration, Uniform vs non-uniform motion, Motion graphs.
What does Class 9 Science Chapter 7 (Structure of the Atom) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Structure of the Atom" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and the JEE & NEET foundation years.
Are these "Structure of the Atom" questions free to practise?+
Yes — sign in with Google to practise "Structure of the Atom" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Structure of the Atom" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Practise all 90 questions free
Timed quizzes, instant scoring, streaks and XP. Sign in with Google — no card needed.
Start this chapter free →