Class 9 Science
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Questions and Answers

What is the most fundamental unit of matter?

  • Atoms (correct)
  • Compounds
  • Particles
  • Molecules

    • What is the size of an atom?

  • 0.1 to 0.5 micrometers
  • 0.1 to 0.5 nanometers (correct)
  • 1 to 5 nanometers
  • 0.1 to 0.5 centimeters

    • What is the law that states the elements are present in chemical compounds in a predetermined mass ratio?

  • Law of Constant Acceleration
  • Law of Conservation of Energy
  • Law of Constant Proportions (correct)
  • Law of Multiple Proportions

    • What are responsible for forming tiny sand particles, gargantuan black holes, and everything in between?

    <p>Atoms</p> Signup and view all the answers

    What is the oxygen and hydrogen content in pure water an example of?

    <p>Law of Constant Proportions</p> Signup and view all the answers

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