Structure of the Matter Quiz - CBSE Class 9 Science

Free practice quiz: Structure of the Matter (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 20 multiple-choice questions on Structure of the Matter, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the smallest particle of an element that retains its chemical properties?

   1. Molecule
   2. Atom
   3. Proton
   4. Electron
   Show answer

   Answer: B. Atom

   An atom is the smallest unit of an element that maintains its chemical properties.

2. Which part of the atom contains most of its mass?

   1. Electron cloud
   2. Nucleus
   3. Protons
   4. Neutrons
   Show answer

   Answer: B. Nucleus

   The nucleus of an atom contains protons and neutrons, which account for most of its mass.

3. What is formed when two or more atoms bond together?

   1. Element
   2. Molecule
   3. Compound
   4. Isotope
   Show answer

   Answer: B. Molecule

   When atoms bond together, they form a molecule. If the atoms are different, the molecule can be a compound.

4. Which experiment led to the discovery of the electron?

   1. Gold Foil Experiment
   2. Cathode Ray Tube Experiment
   3. Oil Drop Experiment
   4. Photoelectric Effect
   Show answer

   Answer: B. Cathode Ray Tube Experiment

   The Cathode Ray Tube Experiment, conducted by J.J. Thomson, led to the discovery of the electron as it demonstrated the presence of a negatively charged particle within the atom.

5. What does the atomic mass unit (amu) measure?

   1. Average mass of an element
   2. Mass of a proton or neutron
   3. Mass of electron
   4. Total mass of an atom
   Show answer

   Answer: B. Mass of a proton or neutron

   1 atomic mass unit (amu) is approximately equal to the mass of one proton or neutron and is used to express atomic and molecular weights.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the basic unit of matter?
2. Which subatomic particle has a positive charge?
3. What is the charge of a neutron?
4. Which is lighter, proton or electron?
5. What term describes the number of protons in the nucleus of an atom?
6. Which part of the atom is responsible for chemical reactions?
7. By what process do atoms achieve a full outer shell of electrons?
8. What is the smallest particle in a chemical element that can exist independently?
9. Which model of the atom first proposed the existence of the nucleus?
10. What is isotopes differ in?
11. How is relative atomic mass of an element defined?
12. What is the significance of Avogadro's constant?
13. Which concept explains the dual wave-particle nature of the electron?
14. Which theory describes electrons revolving in specific paths?
15. What does Heisenberg's Uncertainty Principle state?

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