Q2 Practice Assessment

What is your name?

4. Ptolemy, believed that all objects in space, including the Sun, revolved around Earth. Nicolaus Copernicus made observations showing that Earth and other planets revolved around the Sun, which refuted Ptolemy’s argument. What is this an example of?

• Scientific knowledge starts as a scientific theory and becomes a scientific law.
• Scientific knowledge is communicated between scientists.
• Scientific knowledge always stays the same.
• Scientific knowledge changes as a result of new evidence.

6. Which waves on the electromagnetic spectrum have the lowest frequency and longest wavelength?

• gamma rays
• visible light waves
• microwaves
• radio waves

7. The diagram below shows a portion of the electromagnetic spectrum. Which type of wave should be placed in the shaded box?

• visible light
• long wave
• short wave
• non-visible light

8. You may see something under water and reach into the water to pick it up. However, the object is not where you thought it would be. What property of light is responsible for this?

• absorption
• transmission
• refraction
• reflection

9. Jimmy told his friend about the rainbow he saw just after a rainstorm. Jimmy then explained to his friend how a rainbow forms. What was Jimmy’s explanation?

• The intensity of light increased as the waves passed through tiny droplets of water.
• Light traveled faster after the rainstorm because of the moisture in the air.
• Tiny droplets of water reflected the light waves that struck them.
• The light waves were refracted by moisture in the air.

10. Which of the following materials would sound travel fastest through?

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

11. Which of the following materials would light travel fastest through?

• plastic
• air
• water
• light waves travel the same in each one

12. How does the speed of light in water compare to its speed in air?

• The speed is the same in water because it is constant in all mediums.
• 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 cannot be compared without knowing the temperature.

13. The table shows distances between two objects or places in kilometers. Kilometers, however, are not the units that scientists usually use to measure all the distances shown in the table. The distance between which two objects or places would BEST be measured in light years?

• Boston and Los Angeles
• Our Sun and the nearest star
• Earth's maximum distance from Saturn
• Earth's surface and an orbiting satellite