Chapter Exam

Chapter-12 Atomic Structure — Online MCQ Test

Q: What is the center of an atom called?

Answer: B. Nucleus — The nucleus is the dense central part of an atom. It contains protons and neutrons.

Q: Which subatomic particle has a negative charge?

Answer: C. Electron — Electrons carry negative charge and revolve around the nucleus in an atom.

Q: A student says atoms are indivisible and cannot be broken into smaller particles. Which discovery proves this statement wrong?

Answer: B. Discovery of subatomic particles — The discovery of electrons, protons, and neutrons showed that atoms have smaller parts inside them.

Q: Which is the best conclusion when an atom gains one electron?

Answer: B. It becomes a negatively charged ion — Gaining an electron gives the atom extra negative charge, so it becomes a negatively charged ion.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-12 Atomic Structure with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: atom electron proton Covers atoms molecules subatomic particles and atomic models. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-12 Atomic Structure — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-12 Atomic Structure, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the center of an atom called?