Density Concepts for 7th Graders PDF

# Density Concepts for 7th Graders ## Multiple Choice Quiz 1. What is the definition of density? * The amount of space an object takes up * **The amount of mass in a given volume** * The speed at which an object falls * The temperature at which a substance melts 2. Which formula i...

# Density Concepts for 7th Graders ## Multiple Choice Quiz 1. What is the definition of density? * The amount of space an object takes up * **The amount of mass in a given volume** * The speed at which an object falls * The temperature at which a substance melts 2. Which formula is used to calculate density? * Density = Mass × Volume * Density = Volume / Mass * Density = Volume / Mass * **Density = Mass / Volume** 3. If an object has a mass of 200 g and a volume of 50 cm³, what is its density? * 4 g/cm³ * 2 g/cm³ * 0.25 g/cm³ * **10 g/cm³** 4. Which of the following substances is likely to float on water? * Iron * Gold * **Oil** * Silver 5. What happens to the density of a substance if its mass remains constant but its volume increases? * The density increases * **The density decreases** * The density remains the same * The density doubles 6. Which is denser: a cube of wood or a cube of steel of the same size? * Wood * **Steel** * They have the same density * It depends on the temperature 7. If two objects have the same volume but different masses, which one is denser? * The one with the larger mass * The one with the smaller mass * They have the same density * Density cannot be determined 8. How does temperature generally affect the density of a liquid? * Density increases with temperature * **Density decreases with temperature** * Temperature has no effect on density * Density becomes zero at high temperatures 9. Why do icebergs float in the ocean? * **Icebergs are less dense than sea water** * Icebergs are more dense than sea water * Icebergs have the same density as seawater * Icebergs are made of air 10. Which of the following is a unit of density? * **g/mL** * kg * cm³ * m 11. What is the density of water at room temperature? * 0.5 g/mL * **1 g/mL** * 2g/mL * 5 g/mL 12. An object will sink in water if its density is... * Less than the density of water * Equal to the density of water * **Greater than the density of water** * Zero 13. Which of these materials is the least dense? * Lead * Gold * **Air** * Aluminum 14. If a material's density is 8 g/cm³, what is the mass of a 3 cm³ sample? * **24 g** * 8 g * 11 g * 3 g 15. How do you determine the volume of an irregularly shaped object? * Weigh it on a scale * Use a ruler to measure it * **Measure the amount of water it displaces** * Calculate using its mass ## Answer Key 1. b 2. c 3. a 4. c 5. b 6. b 7. a 8. b 9. a 10. a 11. b 12. c 13. c 14. a 15. c