Structure of the Atom Quiz - CBSE Class 9 Science

Free practice quiz: Structure of the Atom (CBSE Class 9 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the basic building block of matter?

   1. Molecules
   2. Compounds
   3. Elements
   4. Atoms
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   Answer: D. Atoms

   Atoms are the fundamental units that make up all matter.

2. What is the charge of a neutron?

   1. Positive
   2. Negative
   3. Neutral
   4. Variable
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   Answer: C. Neutral

   Neutrons are neutrally charged particles present in the nucleus of an atom.

3. In a neutral atom, the number of electrons is equal to:

   1. Number of protons
   2. Number of neutrons
   3. Atomic mass
   4. Atomic weight
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   Answer: A. Number of protons

   In a neutral atom, the positive charge of the protons is balanced by the negative charge of the electrons.

4. James Chadwick is best known for discovering:

   1. Protons
   2. Neutrons
   3. Electrons
   4. Nucleus
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   Answer: B. Neutrons

   James Chadwick discovered the neutron, a neutrally charged particle in the nucleus.

5. Which type of particle has no electric charge?

   1. Electron
   2. Proton
   3. Neutron
   4. Quark
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   Answer: C. Neutron

   Neutrons are neutral particles found in the nucleus of an atom, having no charge.

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