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.

Sample questions

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

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

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