Density: Key Concepts
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Questions and Answers

What is the definition of density?

  • The speed at which an object falls
  • The amount of mass in a given volume (correct)
  • The amount of space an object takes up
  • The temperature at which a substance melts
  • Which formula is used to calculate density?

  • Density = Mass × Volume
  • Density = Volume
  • Density = Volume / Mass
  • Density = Mass / Volume (correct)
  • If an object has a mass of 200 g and a volume of 50 cm³, what is its density?

  • 4 g/cm³ (correct)
  • 10 g/cm³
  • 2 g/cm³
  • 0.25 g/cm³
  • Which of the following substances is likely to float on water?

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

    What happens to the density of a substance if its mass remains constant but its volume increases?

    <p>The density decreases</p> Signup and view all the answers

    Which is denser: a cube of wood or a cube of steel of the same size?

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

    If two objects have the same volume but different masses, which one is denser?

    <p>The one with the larger mass</p> Signup and view all the answers

    How does temperature generally affect the density of a liquid?

    <p>Density decreases with temperature</p> Signup and view all the answers

    Why do icebergs float in the ocean?

    <p>Icebergs are less dense than sea water</p> Signup and view all the answers

    Which of the following is a unit of density?

    <p>g/mL</p> Signup and view all the answers

    What is the density of water at room temperature?

    <p>1 g/mL</p> Signup and view all the answers

    An object will sink in water if its density is...

    <p>Greater than the density of water</p> Signup and view all the answers

    Which of these materials is the least dense?

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

    If a material's density is 8 g/cm³, what is the mass of a 3 cm³ sample?

    <p>24 g</p> Signup and view all the answers

    How do you determine the volume of an irregularly shaped object?

    <p>Measure the amount of water it displaces</p> Signup and view all the answers

    Study Notes

    Density: Key Concepts

    • Density measures how much mass is packed into a given volume.
    • Formula for calculating density: Density = Mass / Volume
    • Units used to express density are often g/cm³, g/mL, or kg/m³.
    • Water has a density of 1 g/mL at room temperature.
    • An object will sink in water if its density is greater than the density of water.
    • Less dense objects will float on water.
    • Temperature affects the density of liquids: Density typically decreases as temperature increases.
    • To determine the volume of an irregularly shaped object, you can measure the amount of water it displaces.
    • Mass is the amount of matter in an object.
    • Volume is the amount of space an object takes up.

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    Density MCQ 7th Grade PDF

    Description

    This quiz covers fundamental concepts of density, including its formula, units of measurement, and the effects of temperature. You'll learn how density determines whether objects sink or float in water and how to measure the volume of irregularly shaped objects. Test your understanding of these essential principles!

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