G7 Q2 Science Practice Assessment

1. How is ultraviolet light different from the light emitted by a flashlight? (7.P.10.1)

• Ultraviolet light is brighter than the light from a flashlight.
• Only light from a flashlight can travel through empty space.
• Ultraviolet light has a longer wavelength than the light from a flashlight.
• Ultraviolet light is invisible to the human eye.

2. White light is made up of a spectrum of many different colors. What property is used to divide the various colors in the spectrum? (7.P.10.1)

• speed
• wavelength
• density
• temperature

3. What is the primary difference between the colors of visible light? (7.P.10.1)

• the brightness of each color
• the heat produced by each color
• the wavelength of each color
• the speed of each color in empty space

4. Which of the following materials would sound travel fastest through? (7.P.10.3)

• a sponge
• a beaker of water
• the air in the room
• a wooden desk

5. Which of the following materials would light travel fastest through? (7.P.10.3)

• air
• plastic
• water
• light waves travel through all matter at the same speed

6. How does the speed of light in water compare to its speed in air? (7.P.10.3)

• The speed is faster in water than in air because the molecules are closer together.
• The speed is slower in water than in air because the molecules are closer together.
• The speed is the same in water because it is constant in all mediums.
• The speed cannot be compared without knowing the temperature.

7. Which of the following could result from heat being transferred to a substance? (7.P.11.1)

• The substance changes from a liquid to a gas.
• The substance changes from a gas to a liquid.
• The substance changes from a liquid to a solid.
• The substance changes from a gas to a solid.

8. The more heat the particles contain, the faster they move about. In which state of matter do the particles have the most heat? (7.P.11.1)

• in both a solid and liquid
• in a liquid
• in a gas
• in a solid

9. If the temperature of an object is 30° C, which of the following temperatures would indicate the most heat that was removed from this object? (7.P.11.1)

• 40*C
• 30*C
• 20*C
• 10*C

10. Alexander hooks a rubber band around his thumb and forefinger. He moves his fingers apart, stretching the rubber band. With a quick, sudden motion, he bends his thumb forward so that the rubber band slips off. What happens next? (7.P.11.2)

• The potential energy stored in the rubber band changes to heat energy.
• The potential energy stored in the stretched rubber band changes to kinetic energy.
• The potential energy stored in Alexander’s body changes to kinetic energy.
• The potential energy stored in Alexander’s body changes to potential energy in the rubber band.