Chapter 4: Atomic Structure — Online MCQ Test
SCIENCE · Samacheer Kalvi 7th · Tamil Nadu State Board
Practice Chapter 4: Atomic Structure with a free chapter-wise online MCQ test.
This chapter covers: Atom electron proton neutron Introduction to atoms molecules subatomic particles and atomic models.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 4: Atomic Structure — Important Questions & Answers
Which of the following is the smallest particle of an element that retains its chemical properties?
- A. Atom
- B. Molecule
- C. Cell
- D. Compound
Answer: A. Atom
An atom is the smallest unit of an element that retains the chemical properties of that element.
An atom is the smallest unit of an element that retains the chemical properties of that element.
Who proposed the nuclear model of the atom?
- A. J. J. Thomson
- B. Ernest Rutherford
- C. John Dalton
- D. Neils Bohr
Answer: B. Ernest Rutherford
Ernest Rutherford proposed the nuclear model based on his gold foil experiment.
Ernest Rutherford proposed the nuclear model based on his gold foil experiment.
Which part of an atom contains protons and neutrons?
- A. Electron shell
- B. Nucleus
- C. Orbit
- D. Molecule
Answer: B. Nucleus
The nucleus is the central part of the atom and contains protons and neutrons.
The nucleus is the central part of the atom and contains protons and neutrons.
Which of the following is the correct order from smallest to largest?
- A. Atom, molecule, element
- B. Electron, atom, molecule
- C. Molecule, atom, electron
- D. Element, atom, molecule
Answer: B. Electron, atom, molecule
An electron is a subatomic particle, an atom is larger than an electron, and molecules are formed by joining atoms.
An electron is a subatomic particle, an atom is larger than an electron, and molecules are formed by joining atoms.
Which of the following statements about electrons is correct?
- A. They are found inside the nucleus only
- B. They have no mass at all
- C. They revolve around the nucleus
- D. They are positively charged
Answer: C. They revolve around the nucleus
Electrons move around the nucleus in shells or orbits in simple atomic models taught at this level.
Electrons move around the nucleus in shells or orbits in simple atomic models taught at this level.